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f7b47737 | 1 | Guile NEWS --- history of user-visible changes. -*- text -*- |
ffd0ef3b | 2 | Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
5c54da76 JB |
3 | See the end for copying conditions. |
4 | ||
e1b6c710 | 5 | Please send Guile bug reports to bug-guile@gnu.org. |
5c54da76 | 6 | \f |
ee0c7345 MV |
7 | Changes since the stable branch: |
8 | ||
4e250ded MV |
9 | * Changes to the distribution |
10 | ||
d52f53b1 MV |
11 | ** There are two new thread implementation options: "null" and |
12 | "coop-pthreads". | |
f0b4d944 MV |
13 | |
14 | When you configure "--with-threads=null", you will get the usual | |
15 | threading API (call-with-new-thread, make-mutex, etc), but you can't | |
429d88d4 MV |
16 | actually create new threads. Also, "--with-threads=no" is now |
17 | equivalent to "--with-threads=null". This means that the thread API | |
18 | is always present, although you might not be able to create new | |
19 | threads. | |
f0b4d944 | 20 | |
d52f53b1 MV |
21 | The "coop-pthread" (or shorter: "copt") thread implementation will use |
22 | portable POSIX threads but will restrict them so that only one thread | |
23 | can execute 'in Guile' at any one time. This option will give you the | |
2902a459 | 24 | same basic behavior as the old "coop" option, but hopefully in a more |
d52f53b1 | 25 | portable way. |
f0b4d944 | 26 | |
2902a459 MV |
27 | The default is now "coop-pthread", unless your platform doesn't have |
28 | pthreads, in which case "null" threads are used. | |
29 | ||
4e250ded MV |
30 | ** Guile now includes its own version of libltdl. |
31 | ||
32 | We now use a modified version of libltdl that allows us to make | |
33 | improvements to it without having to rely on libtool releases. | |
34 | ||
f12ef3fd MV |
35 | * Changes to the standalone interpreter |
36 | ||
37 | ** New command line option `--no-debug'. | |
38 | ||
39 | Specifying `--no-debug' on the command line will keep the debugging | |
40 | evaluator turned off, even for interactive sessions. | |
41 | ||
42 | ** User-init file ~/.guile is now loaded with the debugging evaluator. | |
43 | ||
44 | Previously, the normal evaluator would have been used. Using the | |
45 | debugging evaluator gives better error messages. | |
46 | ||
47 | * Changes to Scheme functions and syntax | |
48 | ||
e2d820a1 MV |
49 | ** Mutexes are now recursive. |
50 | ||
51 | Locking a mutex that you have already locked will now succeed. Every | |
52 | call to lock-mutex must be matched with a call to unlock-mutex. Only | |
53 | the last call to unlock-mutex will actually unlock the mutex. | |
54 | ||
55 | ** New function 'try-mutex'. | |
56 | ||
57 | This function will attempt to lock a mutex but will return immediately | |
1e5f92ce | 58 | instead if blocking and indicate failure. |
e2d820a1 MV |
59 | |
60 | ** Waiting on a condition variable can have a timeout. | |
61 | ||
62 | The funtion 'wait-condition-variable' now takes a third, optional | |
63 | argument that specifies the point in time where the waiting should be | |
64 | aborted. | |
65 | ||
66 | ** New function 'broadcast-condition-variable'. | |
67 | ||
5e405a60 MV |
68 | ** New functions 'all-threads' and 'current-thread'. |
69 | ||
70 | ** Signals and system asyncs work better with threads. | |
71 | ||
72 | The function 'sigaction' now takes a fourth, optional, argument that | |
73 | specifies the thread that the handler should run in. When the | |
74 | argument is omitted, the handler will run in the thread that called | |
75 | 'sigaction'. | |
76 | ||
77 | Likewise, 'system-async-mark' takes a second, optional, argument that | |
78 | specifies the thread that the async should run in. When it is | |
79 | omitted, the async will run in the thread that called | |
80 | 'system-async-mark'. | |
81 | ||
82 | C code can use the new functions scm_sigaction_for_thread and | |
83 | scm_system_async_mark_for_thread to pass the new thread argument. | |
84 | ||
85 | ** The function 'system-async' is deprecated. | |
86 | ||
87 | You can now pass any zero-argument procedure to 'system-async-mark'. | |
88 | The function 'system-async' will just return its argument unchanged | |
89 | now. | |
90 | ||
acfa1f52 MV |
91 | ** New functions 'call-with-blocked-asyncs' and |
92 | 'call-with-unblocked-asyncs' | |
93 | ||
94 | The expression (call-with-blocked-asyncs PROC) will call PROC and will | |
95 | block execution of system asyncs for the current thread by one level | |
96 | while PROC runs. Likewise, call-with-unblocked-asyncs will call a | |
97 | procedure and will unblock the execution of system asyncs by one | |
98 | level for the current thread. | |
99 | ||
100 | Only system asyncs are affected by these functions. | |
101 | ||
102 | ** The functions 'mask-signals' and 'unmask-signals' are deprecated. | |
103 | ||
104 | Use 'call-with-blocked-asyncs' or 'call-with-unblocked-asyncs' | |
105 | instead. Those functions are easier to use correctly and can be | |
106 | nested. | |
107 | ||
7b232758 MV |
108 | ** New function 'unsetenv'. |
109 | ||
f30482f3 MV |
110 | ** New macro 'define-syntax-public'. |
111 | ||
112 | It works like 'define-syntax' and also exports the defined macro (but | |
113 | only on top-level). | |
114 | ||
1ee34062 MV |
115 | ** There is support for Infinity and NaNs. |
116 | ||
117 | Following PLT Scheme, Guile can now work with infinite numbers, and | |
118 | 'not-a-numbers'. | |
119 | ||
120 | There is new syntax for numbers: "+inf.0" (infinity), "-inf.0" | |
121 | (negative infinity), "+nan.0" (not-a-number), and "-nan.0" (same as | |
122 | "+nan.0"). These numbers are inexact and have no exact counterpart. | |
123 | ||
124 | Dividing by an inexact zero returns +inf.0 or -inf.0, depending on the | |
125 | sign of the dividend. The infinities are integers, and they answer #t | |
126 | for both 'even?' and 'odd?'. The +nan.0 value is not an integer and is | |
127 | not '=' to itself, but '+nan.0' is 'eqv?' to itself. | |
128 | ||
129 | For example | |
130 | ||
131 | (/ 1 0.0) | |
132 | => +inf.0 | |
133 | ||
134 | (/ 0 0.0) | |
135 | => +nan.0 | |
136 | ||
137 | (/ 0) | |
138 | ERROR: Numerical overflow | |
139 | ||
7b232758 MV |
140 | Two new predicates 'inf?' and 'nan?' can be used to test for the |
141 | special values. | |
142 | ||
ba1b077b MV |
143 | ** Inexact zero can have a sign. |
144 | ||
145 | Guile can now distinguish between plus and minus inexact zero, if your | |
146 | platform supports this, too. The two zeros are equal according to | |
147 | '=', but not according to 'eqv?'. For example | |
148 | ||
149 | (- 0.0) | |
150 | => -0.0 | |
151 | ||
152 | (= 0.0 (- 0.0)) | |
153 | => #t | |
154 | ||
155 | (eqv? 0.0 (- 0.0)) | |
156 | => #f | |
157 | ||
610922b2 MV |
158 | ** We now have uninterned symbols. |
159 | ||
160 | The new function 'make-symbol' will return a uninterned symbol. This | |
161 | is a symbol that is unique and is guaranteed to remain unique. | |
162 | However, uninterned symbols can not yet be read back in. | |
163 | ||
164 | Use the new function 'symbol-interned?' to check whether a symbol is | |
165 | interned or not. | |
166 | ||
0e6f7775 MV |
167 | ** pretty-print has more options. |
168 | ||
169 | The function pretty-print from the (ice-9 pretty-print) module can now | |
170 | also be invoked with keyword arguments that control things like | |
171 | maximum output width. See its online documentation. | |
172 | ||
8c84b81e | 173 | ** Variables have no longer a special behavior for `equal?'. |
ee0c7345 MV |
174 | |
175 | Previously, comparing two variables with `equal?' would recursivly | |
176 | compare their values. This is no longer done. Variables are now only | |
177 | `equal?' if they are `eq?'. | |
178 | ||
4e21fa60 MV |
179 | ** `(begin)' is now valid. |
180 | ||
181 | You can now use an empty `begin' form. It will yield #<unspecified> | |
182 | when evaluated and simply be ignored in a definition context. | |
183 | ||
adb8c0f2 MV |
184 | ** Removed: substring-move-left!, substring-move-right! |
185 | ||
186 | Use `substring-move!' instead. | |
187 | ||
3063e30a DH |
188 | ** Deprecated: procedure->macro |
189 | ||
190 | Change your code to use either procedure->memoizing-macro or, probably better, | |
191 | to use r5rs macros. Also, be aware that macro expansion will not be done | |
192 | during evaluation, but prior to evaluation. | |
193 | ||
0a50eeaa NJ |
194 | ** Soft ports now allow a `char-ready?' procedure |
195 | ||
196 | The vector argument to `make-soft-port' can now have a length of | |
197 | either 5 or 6. (Previously the length had to be 5.) The optional 6th | |
198 | element is interpreted as an `input-waiting' thunk -- i.e. a thunk | |
199 | that returns the number of characters that can be read immediately | |
200 | without the soft port blocking. | |
201 | ||
9a69a50e NJ |
202 | ** New debugging feature: breakpoints. |
203 | ||
7195a60f NJ |
204 | Guile now has breakpoints. For details see the `Debugging Features' |
205 | chapter in the reference manual. | |
206 | ||
63dd3413 DH |
207 | ** Deprecated: undefine |
208 | ||
209 | There is no replacement for undefine. | |
210 | ||
b00418df DH |
211 | * Changes to the C interface |
212 | ||
2902a459 MV |
213 | ** The function scm_call_with_new_thread has a new prototype. |
214 | ||
215 | Instead of taking a list with the thunk and handler, these two | |
216 | arguments are now passed directly: | |
217 | ||
218 | SCM scm_call_with_new_thread (SCM thunk, SCM handler); | |
219 | ||
220 | This is an incompatible change. | |
221 | ||
acfa1f52 MV |
222 | ** The value 'scm_mask_ints' is no longer writable. |
223 | ||
224 | Previously, you could set scm_mask_ints directly. This is no longer | |
225 | possible. Use scm_c_call_with_blocked_asyncs and | |
226 | scm_c_call_with_unblocked_asyncs instead. | |
227 | ||
228 | ** New functions scm_c_call_with_blocked_asyncs and | |
229 | scm_c_call_with_unblocked_asyncs | |
230 | ||
231 | Like scm_call_with_blocked_asyncs etc. but for C functions. | |
232 | ||
ffd0ef3b MV |
233 | ** New snarfer macro SCM_DEFINE_PUBLIC. |
234 | ||
235 | This is like SCM_DEFINE, but also calls scm_c_export for the defined | |
236 | function in the init section. | |
237 | ||
8734ce02 MV |
238 | ** The snarfer macro SCM_SNARF_INIT is now officially supported. |
239 | ||
f30482f3 MV |
240 | ** New macros SCM_VECTOR_REF and SCM_VECTOR_SET. |
241 | ||
242 | Use these in preference to SCM_VELTS. | |
243 | ||
39e8f371 | 244 | ** The SCM_VELTS macros now returns a read-only vector. For writing, |
f30482f3 | 245 | use the new macros SCM_WRITABLE_VELTS or SCM_VECTOR_SET. The use of |
ffd0ef3b | 246 | SCM_WRITABLE_VELTS is discouraged, though. |
39e8f371 HWN |
247 | |
248 | ** Garbage collector rewrite. | |
249 | ||
250 | The garbage collector is cleaned up a lot, and now uses lazy | |
251 | sweeping. This is reflected in the output of (gc-stats); since cells | |
252 | are being freed when they are allocated, the cells-allocated field | |
253 | stays roughly constant. | |
254 | ||
255 | For malloc related triggers, the behavior is changed. It uses the same | |
256 | heuristic as the cell-triggered collections. It may be tuned with the | |
257 | environment variables GUILE_MIN_YIELD_MALLOC. This is the percentage | |
258 | for minimum yield of malloc related triggers. The default is 40. | |
259 | GUILE_INIT_MALLOC_LIMIT sets the initial trigger for doing a GC. The | |
260 | default is 200 kb. | |
261 | ||
262 | Debugging operations for the freelist have been deprecated, along with | |
263 | the C variables that control garbage collection. The environment | |
264 | variables GUILE_MAX_SEGMENT_SIZE, GUILE_INIT_SEGMENT_SIZE_2, | |
265 | GUILE_INIT_SEGMENT_SIZE_1, and GUILE_MIN_YIELD_2 should be used. | |
266 | ||
5ec1d2c8 DH |
267 | ** The function scm_definedp has been renamed to scm_defined_p |
268 | ||
269 | The name scm_definedp is deprecated. | |
270 | ||
228a24ef DH |
271 | ** The struct scm_cell has been renamed to scm_t_cell |
272 | ||
273 | This is in accordance to Guile's naming scheme for types. Note that | |
274 | the name scm_cell is now used for a function that allocates and | |
275 | initializes a new cell (see below). | |
276 | ||
0906625f MV |
277 | ** New functions for memory management |
278 | ||
279 | A new set of functions for memory management has been added since the | |
280 | old way (scm_must_malloc, scm_must_free, etc) was error prone and | |
281 | indeed, Guile itself contained some long standing bugs that could | |
282 | cause aborts in long running programs. | |
283 | ||
284 | The new functions are more symmetrical and do not need cooperation | |
285 | from smob free routines, among other improvements. | |
286 | ||
eab1b259 HWN |
287 | The new functions are scm_malloc, scm_realloc, scm_calloc, scm_strdup, |
288 | scm_strndup, scm_gc_malloc, scm_gc_calloc, scm_gc_realloc, | |
289 | scm_gc_free, scm_gc_register_collectable_memory, and | |
0906625f MV |
290 | scm_gc_unregister_collectable_memory. Refer to the manual for more |
291 | details and for upgrading instructions. | |
292 | ||
293 | The old functions for memory management have been deprecated. They | |
294 | are: scm_must_malloc, scm_must_realloc, scm_must_free, | |
295 | scm_must_strdup, scm_must_strndup, scm_done_malloc, scm_done_free. | |
296 | ||
b00418df DH |
297 | ** New function: scm_str2string |
298 | ||
299 | This function creates a scheme string from a 0-terminated C string. The input | |
300 | string is copied. | |
301 | ||
4aa104a4 MV |
302 | ** Declarations of exported features are marked with SCM_API. |
303 | ||
304 | Every declaration of a feature that belongs to the exported Guile API | |
305 | has been marked by adding the macro "SCM_API" to the start of the | |
306 | declaration. This macro can expand into different things, the most | |
307 | common of which is just "extern" for Unix platforms. On Win32, it can | |
308 | be used to control which symbols are exported from a DLL. | |
309 | ||
8f99e3f3 | 310 | If you `#define SCM_IMPORT' before including <libguile.h>, SCM_API |
4aa104a4 MV |
311 | will expand into "__declspec (dllimport) extern", which is needed for |
312 | linking to the Guile DLL in Windows. | |
313 | ||
8f99e3f3 SJ |
314 | There are also SCM_RL_IMPORT, QT_IMPORT, SCM_SRFI1314_IMPORT, and |
315 | SCM_SRFI4_IMPORT, for the corresponding libraries. | |
4aa104a4 | 316 | |
a9930d22 MV |
317 | ** SCM_NEWCELL and SCM_NEWCELL2 have been deprecated. |
318 | ||
228a24ef DH |
319 | Use the new functions scm_cell and scm_double_cell instead. The old macros |
320 | had problems because with them allocation and initialization was separated and | |
321 | the GC could sometimes observe half initialized cells. Only careful coding by | |
322 | the user of SCM_NEWCELL and SCM_NEWCELL2 could make this safe and efficient. | |
a9930d22 | 323 | |
5132eef0 DH |
324 | ** CHECK_ENTRY, CHECK_APPLY and CHECK_EXIT have been deprecated. |
325 | ||
326 | Use the variables scm_check_entry_p, scm_check_apply_p and scm_check_exit_p | |
327 | instead. | |
328 | ||
bc76d628 DH |
329 | ** SRCBRKP has been deprecated. |
330 | ||
331 | Use scm_c_source_property_breakpoint_p instead. | |
332 | ||
3063e30a DH |
333 | ** Deprecated: scm_makmacro |
334 | ||
335 | Change your code to use either scm_makmmacro or, probably better, to use r5rs | |
336 | macros. Also, be aware that macro expansion will not be done during | |
337 | evaluation, but prior to evaluation. | |
338 | ||
843fae71 GH |
339 | ** Removed from scm_root_state: def_inp, def_outp, def_errp, together |
340 | with corresponding macros scm_def_inp, scm_def_outp and scm_def_errp. | |
341 | These were undocumented and unused copies of the standard ports at the | |
342 | time that Guile was initialised. Normally the current ports should be | |
343 | used instead, obtained from scm_current_input_port () etc. If an | |
344 | application needs to retain earlier ports, it should save them in a | |
345 | gc-protected location. | |
867cf9be | 346 | |
c136c920 DH |
347 | ** Removed compile time option MEMOIZE_LOCALS |
348 | ||
349 | Now, caching of local variable positions during memoization is mandatory. | |
350 | However, the option to disable the caching has most probably not been used | |
351 | anyway. | |
352 | ||
8505e285 DH |
353 | ** Removed compile time option SCM_RECKLESS |
354 | ||
355 | Full number of arguments checking of closures is mandatory now. However, the | |
356 | option to disable the checking has most probably not been used anyway. | |
357 | ||
bd987b8e DH |
358 | ** Removed compile time option SCM_CAUTIOUS |
359 | ||
360 | Full number of arguments checking of closures is mandatory now. However, the | |
361 | option to disable the checking has most probably not been used anyway. | |
362 | ||
1e5f92ce MV |
363 | ** Deprecated configure flags USE_THREADS and GUILE_ISELECT |
364 | ||
365 | Previously, when the C preprocessor macro USE_THREADS was defined, | |
366 | libguile included a thread API. This API is now always included, even | |
367 | when threads are not really supported. Thus, you don't need to test | |
368 | for USE_THREADS. | |
369 | ||
370 | Analogously, GUILE_ISELECT was defined when the function | |
371 | scm_internal_select was provided by Guile. This function is now | |
372 | always defined, and GUILE_ISELECT with it. | |
373 | ||
b51bad08 DH |
374 | ** Removed definitions: scm_lisp_nil, scm_lisp_t, s_nil_ify, scm_m_nil_ify, |
375 | s_t_ify, scm_m_t_ify, s_0_cond, scm_m_0_cond, s_0_ify, scm_m_0_ify, s_1_ify, | |
376 | scm_m_1_ify, scm_debug_newcell, scm_debug_newcell2, scm_tc16_allocated, | |
377 | SCM_SET_SYMBOL_HASH, SCM_IM_NIL_IFY, SCM_IM_T_IFY, SCM_IM_0_COND, | |
378 | SCM_IM_0_IFY, SCM_IM_1_IFY, SCM_GC_SET_ALLOCATED, scm_debug_newcell, | |
379 | scm_debug_newcell2, scm_substring_move_left_x, scm_substring_move_right_x, | |
380 | long_long, ulong_long, scm_sizet, SCM_WNA, SCM_OUTOFRANGE, SCM_NALLOC, | |
381 | SCM_HUP_SIGNAL, SCM_INT_SIGNAL, SCM_FPE_SIGNAL, SCM_BUS_SIGNAL, | |
382 | SCM_SEGV_SIGNAL, SCM_ALRM_SIGNAL, SCM_GC_SIGNAL, SCM_TICK_SIGNAL, | |
383 | SCM_SIG_ORD, SCM_ORD_SIG, SCM_NUM_SIGS, moddata, registered_mods, | |
384 | scm_register_module_xxx, scm_registered_modules, | |
385 | scm_clear_registered_modules, scm_wta, *top-level-lookup-closure*, | |
386 | scm_top_level_lookup_closure_var, scm_system_transformer, scm_eval_3, | |
387 | scm_eval2, SCM_SETAND_CAR, SCM_SETOR_CAR, SCM_SETAND_CDR, SCM_SETOR_CDR, | |
388 | SCM_FREEP, SCM_NFREEP, SCM_GC8MARKP, SCM_SETGC8MARK, SCM_CLRGC8MARK, | |
389 | SCM_GCTYP16, SCM_GCCDR, scm_remember, scm_protect_object, | |
390 | scm_unprotect_object, root_module_lookup_closure, scm_sym_app, | |
391 | scm_sym_modules, module_prefix, make_modules_in_var, | |
392 | beautify_user_module_x_var, try_module_autoload_var, scm_module_full_name, | |
393 | scm_the_root_module, scm_make_module, scm_ensure_user_module, | |
394 | scm_load_scheme_module, scm_port, scm_ptob_descriptor, scm_port_rw_active, | |
395 | scm_close_all_ports_except, scm_rstate, scm_rng, scm_i_rstate, | |
396 | SCM_SLOPPY_STRINGP, SCM_RWSTRINGP, SCM_STRING_UCHARS, SCM_STRING_CHARS, | |
397 | scm_read_only_string_p, scm_makstr, scm_makfromstr, | |
398 | scm_make_shared_substring, scm_tc7_substring, SCM_SLOPPY_CONSP, | |
399 | SCM_SLOPPY_NCONSP, scm_tc7_ssymbol, scm_tc7_msymbol, scm_tcs_symbols, | |
400 | sym_huh, scm_variable_set_name_hint, scm_builtin_variable, SCM_VARVCELL, | |
401 | SCM_UDVARIABLEP, SCM_DEFVARIABLEP, scm_internal_with_fluids, | |
402 | scm_make_gsubr, scm_make_gsubr_with_generic, scm_create_hook, list*, | |
403 | SCM_LIST0, SCM_LIST1, SCM_LIST2, SCM_LIST3, SCM_LIST4, SCM_LIST5, | |
404 | SCM_LIST6, SCM_LIST7, SCM_LIST8, SCM_LIST9, scm_listify, scm_sloppy_memq, | |
405 | scm_sloppy_memv, scm_sloppy_member, scm_end_of_file_key, | |
406 | scm_read_and_eval_x, scm_mkbig, scm_big2inum, scm_adjbig, scm_normbig, | |
407 | scm_copybig, scm_2ulong2big, scm_dbl2big, scm_big2dbl, SCM_FIXNUM_BIT, | |
408 | scm_subr_entry, SCM_SUBR_DOC, scm_make_subr_opt, scm_make_subr, | |
409 | scm_make_subr_with_generic, setjmp_type, setjmp_type, | |
410 | scm_call_catching_errors, scm_make_smob_type_mfpe, scm_set_smob_mfpe, | |
411 | scm_strprint_obj, scm_read_0str, scm_eval_0str, SCM_CHARS, SCM_UCHARS, | |
412 | SCM_SETCHARS, SCM_SLOPPY_SUBSTRP, SCM_SUBSTR_STR, SCM_SUBSTR_OFFSET, | |
413 | SCM_LENGTH_MAX, SCM_LENGTH, SCM_SETLENGTH, SCM_ROSTRINGP, SCM_ROLENGTH, | |
414 | SCM_ROCHARS, SCM_ROUCHARS, SCM_SUBSTRP, SCM_COERCE_SUBSTR, scm_strhash, | |
415 | scm_sym2vcell, scm_sym2ovcell_soft, scm_sym2ovcell, | |
416 | scm_intern_obarray_soft, scm_intern_obarray, scm_intern, scm_intern0, | |
417 | scm_sysintern, scm_sysintern0, scm_sysintern0_no_module_lookup, | |
418 | scm_symbol_value0, scm_string_to_obarray_symbol, scm_intern_symbol, | |
419 | scm_unintern_symbol, scm_symbol_binding, scm_symbol_interned_p, | |
420 | scm_symbol_bound_p, scm_symbol_set_x, scm_gentemp, | |
421 | scm_init_symbols_deprecated, s_vector_set_length_x, scm_vector_set_length_x, | |
422 | scm_contregs, scm_debug_info, scm_debug_frame, SCM_DSIDEVAL, SCM_OPDIRP, | |
423 | scm_fport, scm_option, SCM_CONST_LONG, SCM_VCELL, SCM_GLOBAL_VCELL, | |
424 | SCM_VCELL_INIT, SCM_GLOBAL_VCELL_INIT, scm_srcprops, scm_srcprops_chunk, | |
425 | scm_info_frame, scm_stack, scm_array, scm_array_dim, SCM_ARRAY_CONTIGUOUS, | |
426 | SCM_HUGE_LENGTH, SCM_FUNC_NAME, SCM_WTA, RETURN_SCM_WTA, | |
427 | SCM_VALIDATE_NUMBER_COPY, SCM_VALIDATE_NUMBER_DEF_COPY, | |
428 | SCM_VALIDATE_STRINGORSUBSTR, SCM_VALIDATE_ROSTRING, | |
429 | SCM_VALIDATE_ROSTRING_COPY, SCM_VALIDATE_NULLORROSTRING_COPY, | |
430 | SCM_VALIDATE_RWSTRING, SCM_VALIDATE_OPDIR, DIGITS, scm_small_istr2int, | |
431 | scm_istr2int, scm_istr2flo, scm_istring2number, scm_istr2int, | |
432 | scm_istr2flo, scm_istring2number, scm_vtable_index_vcell, scm_si_vcell, | |
433 | SCM_ECONSP, SCM_NECONSP, SCM_GLOC_VAR, SCM_GLOC_VAL, SCM_GLOC_SET_VAL, | |
434 | SCM_GLOC_VAL_LOC, scm_make_gloc, scm_gloc_p, scm_tc16_variable | |
435 | ||
c299f186 MD |
436 | Changes since Guile 1.4: |
437 | ||
438 | * Changes to the distribution | |
439 | ||
32d6f999 TTN |
440 | ** A top-level TODO file is included. |
441 | ||
311b6a3c | 442 | ** Guile now uses a versioning scheme similar to that of the Linux kernel. |
c81ea65d RB |
443 | |
444 | Guile now always uses three numbers to represent the version, | |
445 | i.e. "1.6.5". The first number, 1, is the major version number, the | |
446 | second number, 6, is the minor version number, and the third number, | |
447 | 5, is the micro version number. Changes in major version number | |
448 | indicate major changes in Guile. | |
449 | ||
450 | Minor version numbers that are even denote stable releases, and odd | |
451 | minor version numbers denote development versions (which may be | |
452 | unstable). The micro version number indicates a minor sub-revision of | |
453 | a given MAJOR.MINOR release. | |
454 | ||
455 | In keeping with the new scheme, (minor-version) and scm_minor_version | |
456 | no longer return everything but the major version number. They now | |
457 | just return the minor version number. Two new functions | |
458 | (micro-version) and scm_micro_version have been added to report the | |
459 | micro version number. | |
460 | ||
461 | In addition, ./GUILE-VERSION now defines GUILE_MICRO_VERSION. | |
462 | ||
5c790b44 RB |
463 | ** New preprocessor definitions are available for checking versions. |
464 | ||
465 | version.h now #defines SCM_MAJOR_VERSION, SCM_MINOR_VERSION, and | |
466 | SCM_MICRO_VERSION to the appropriate integer values. | |
467 | ||
311b6a3c MV |
468 | ** Guile now actively warns about deprecated features. |
469 | ||
470 | The new configure option `--enable-deprecated=LEVEL' and the | |
471 | environment variable GUILE_WARN_DEPRECATED control this mechanism. | |
472 | See INSTALL and README for more information. | |
473 | ||
0b073f0f RB |
474 | ** Guile is much more likely to work on 64-bit architectures. |
475 | ||
476 | Guile now compiles and passes "make check" with only two UNRESOLVED GC | |
5e137c65 RB |
477 | cases on Alpha and ia64 based machines now. Thanks to John Goerzen |
478 | for the use of a test machine, and thanks to Stefan Jahn for ia64 | |
479 | patches. | |
0b073f0f | 480 | |
e658215a RB |
481 | ** New functions: setitimer and getitimer. |
482 | ||
483 | These implement a fairly direct interface to the libc functions of the | |
484 | same name. | |
485 | ||
8630fdfc RB |
486 | ** The #. reader extension is now disabled by default. |
487 | ||
488 | For safety reasons, #. evaluation is disabled by default. To | |
489 | re-enable it, set the fluid read-eval? to #t. For example: | |
490 | ||
67b7dd9e | 491 | (fluid-set! read-eval? #t) |
8630fdfc RB |
492 | |
493 | but make sure you realize the potential security risks involved. With | |
494 | read-eval? enabled, reading a data file from an untrusted source can | |
495 | be dangerous. | |
496 | ||
f2a75d81 | 497 | ** New SRFI modules have been added: |
4df36934 | 498 | |
dfdf5826 MG |
499 | SRFI-0 `cond-expand' is now supported in Guile, without requiring |
500 | using a module. | |
501 | ||
e8bb0476 MG |
502 | (srfi srfi-1) is a library containing many useful pair- and list-processing |
503 | procedures. | |
504 | ||
7adc2c58 | 505 | (srfi srfi-2) exports and-let*. |
4df36934 | 506 | |
b74a7ec8 MG |
507 | (srfi srfi-4) implements homogeneous numeric vector datatypes. |
508 | ||
7adc2c58 RB |
509 | (srfi srfi-6) is a dummy module for now, since guile already provides |
510 | all of the srfi-6 procedures by default: open-input-string, | |
511 | open-output-string, get-output-string. | |
4df36934 | 512 | |
7adc2c58 | 513 | (srfi srfi-8) exports receive. |
4df36934 | 514 | |
7adc2c58 | 515 | (srfi srfi-9) exports define-record-type. |
4df36934 | 516 | |
dfdf5826 MG |
517 | (srfi srfi-10) exports define-reader-ctor and implements the reader |
518 | extension #,(). | |
519 | ||
7adc2c58 | 520 | (srfi srfi-11) exports let-values and let*-values. |
4df36934 | 521 | |
7adc2c58 | 522 | (srfi srfi-13) implements the SRFI String Library. |
53e29a1e | 523 | |
7adc2c58 | 524 | (srfi srfi-14) implements the SRFI Character-Set Library. |
53e29a1e | 525 | |
dfdf5826 MG |
526 | (srfi srfi-17) implements setter and getter-with-setter and redefines |
527 | some accessor procedures as procedures with getters. (such as car, | |
528 | cdr, vector-ref etc.) | |
529 | ||
530 | (srfi srfi-19) implements the SRFI Time/Date Library. | |
2b60bc95 | 531 | |
466bb4b3 TTN |
532 | ** New scripts / "executable modules" |
533 | ||
534 | Subdirectory "scripts" contains Scheme modules that are packaged to | |
535 | also be executable as scripts. At this time, these scripts are available: | |
536 | ||
537 | display-commentary | |
538 | doc-snarf | |
539 | generate-autoload | |
540 | punify | |
58e5b910 | 541 | read-scheme-source |
466bb4b3 TTN |
542 | use2dot |
543 | ||
544 | See README there for more info. | |
545 | ||
54c17ccb TTN |
546 | These scripts can be invoked from the shell with the new program |
547 | "guile-tools", which keeps track of installation directory for you. | |
548 | For example: | |
549 | ||
550 | $ guile-tools display-commentary srfi/*.scm | |
551 | ||
552 | guile-tools is copied to the standard $bindir on "make install". | |
553 | ||
0109c4bf MD |
554 | ** New module (ice-9 stack-catch): |
555 | ||
556 | stack-catch is like catch, but saves the current state of the stack in | |
3c1d1301 RB |
557 | the fluid the-last-stack. This fluid can be useful when using the |
558 | debugger and when re-throwing an error. | |
0109c4bf | 559 | |
fbf0c8c7 MV |
560 | ** The module (ice-9 and-let*) has been renamed to (ice-9 and-let-star) |
561 | ||
562 | This has been done to prevent problems on lesser operating systems | |
563 | that can't tolerate `*'s in file names. The exported macro continues | |
564 | to be named `and-let*', of course. | |
565 | ||
4f60cc33 | 566 | On systems that support it, there is also a compatibility module named |
fbf0c8c7 | 567 | (ice-9 and-let*). It will go away in the next release. |
6c0201ad | 568 | |
9d774814 | 569 | ** New modules (oop goops) etc.: |
14f1d9fe MD |
570 | |
571 | (oop goops) | |
572 | (oop goops describe) | |
573 | (oop goops save) | |
574 | (oop goops active-slot) | |
575 | (oop goops composite-slot) | |
576 | ||
9d774814 | 577 | The Guile Object Oriented Programming System (GOOPS) has been |
311b6a3c MV |
578 | integrated into Guile. For further information, consult the GOOPS |
579 | manual and tutorial in the `doc' directory. | |
14f1d9fe | 580 | |
9d774814 GH |
581 | ** New module (ice-9 rdelim). |
582 | ||
583 | This exports the following procedures which were previously defined | |
1c8cbd62 | 584 | in the default environment: |
9d774814 | 585 | |
1c8cbd62 GH |
586 | read-line read-line! read-delimited read-delimited! %read-delimited! |
587 | %read-line write-line | |
9d774814 | 588 | |
1c8cbd62 GH |
589 | For backwards compatibility the definitions are still imported into the |
590 | default environment in this version of Guile. However you should add: | |
9d774814 GH |
591 | |
592 | (use-modules (ice-9 rdelim)) | |
593 | ||
1c8cbd62 GH |
594 | to any program which uses the definitions, since this may change in |
595 | future. | |
9d774814 GH |
596 | |
597 | Alternatively, if guile-scsh is installed, the (scsh rdelim) module | |
598 | can be used for similar functionality. | |
599 | ||
7e267da1 GH |
600 | ** New module (ice-9 rw) |
601 | ||
602 | This is a subset of the (scsh rw) module from guile-scsh. Currently | |
373f4948 | 603 | it defines two procedures: |
7e267da1 | 604 | |
311b6a3c | 605 | *** New function: read-string!/partial str [port_or_fdes [start [end]]] |
7e267da1 | 606 | |
4bcdfe46 GH |
607 | Read characters from a port or file descriptor into a string STR. |
608 | A port must have an underlying file descriptor -- a so-called | |
609 | fport. This procedure is scsh-compatible and can efficiently read | |
311b6a3c | 610 | large strings. |
7e267da1 | 611 | |
4bcdfe46 GH |
612 | *** New function: write-string/partial str [port_or_fdes [start [end]]] |
613 | ||
614 | Write characters from a string STR to a port or file descriptor. | |
615 | A port must have an underlying file descriptor -- a so-called | |
616 | fport. This procedure is mostly compatible and can efficiently | |
617 | write large strings. | |
618 | ||
e5005373 KN |
619 | ** New module (ice-9 match) |
620 | ||
311b6a3c MV |
621 | This module includes Andrew K. Wright's pattern matcher. See |
622 | ice-9/match.scm for brief description or | |
e5005373 | 623 | |
311b6a3c | 624 | http://www.star-lab.com/wright/code.html |
e5005373 | 625 | |
311b6a3c | 626 | for complete documentation. |
e5005373 | 627 | |
4f60cc33 NJ |
628 | ** New module (ice-9 buffered-input) |
629 | ||
630 | This module provides procedures to construct an input port from an | |
631 | underlying source of input that reads and returns its input in chunks. | |
632 | The underlying input source is a Scheme procedure, specified by the | |
633 | caller, which the port invokes whenever it needs more input. | |
634 | ||
635 | This is useful when building an input port whose back end is Readline | |
636 | or a UI element such as the GtkEntry widget. | |
637 | ||
638 | ** Documentation | |
639 | ||
640 | The reference and tutorial documentation that was previously | |
641 | distributed separately, as `guile-doc', is now included in the core | |
642 | Guile distribution. The documentation consists of the following | |
643 | manuals. | |
644 | ||
645 | - The Guile Tutorial (guile-tut.texi) contains a tutorial introduction | |
646 | to using Guile. | |
647 | ||
648 | - The Guile Reference Manual (guile.texi) contains (or is intended to | |
649 | contain) reference documentation on all aspects of Guile. | |
650 | ||
651 | - The GOOPS Manual (goops.texi) contains both tutorial-style and | |
652 | reference documentation for using GOOPS, Guile's Object Oriented | |
653 | Programming System. | |
654 | ||
c3e62877 NJ |
655 | - The Revised^5 Report on the Algorithmic Language Scheme |
656 | (r5rs.texi). | |
4f60cc33 NJ |
657 | |
658 | See the README file in the `doc' directory for more details. | |
659 | ||
094a67bb MV |
660 | ** There are a couple of examples in the examples/ directory now. |
661 | ||
9d774814 GH |
662 | * Changes to the stand-alone interpreter |
663 | ||
e7e58018 MG |
664 | ** New command line option `--use-srfi' |
665 | ||
666 | Using this option, SRFI modules can be loaded on startup and be | |
667 | available right from the beginning. This makes programming portable | |
668 | Scheme programs easier. | |
669 | ||
670 | The option `--use-srfi' expects a comma-separated list of numbers, | |
671 | each representing a SRFI number to be loaded into the interpreter | |
672 | before starting evaluating a script file or the REPL. Additionally, | |
673 | the feature identifier for the loaded SRFIs is recognized by | |
674 | `cond-expand' when using this option. | |
675 | ||
676 | Example: | |
677 | $ guile --use-srfi=8,13 | |
678 | guile> (receive (x z) (values 1 2) (+ 1 2)) | |
679 | 3 | |
58e5b910 | 680 | guile> (string-pad "bla" 20) |
e7e58018 MG |
681 | " bla" |
682 | ||
094a67bb MV |
683 | ** Guile now always starts up in the `(guile-user)' module. |
684 | ||
6e9382f1 | 685 | Previously, scripts executed via the `-s' option would run in the |
094a67bb MV |
686 | `(guile)' module and the repl would run in the `(guile-user)' module. |
687 | Now every user action takes place in the `(guile-user)' module by | |
688 | default. | |
e7e58018 | 689 | |
c299f186 MD |
690 | * Changes to Scheme functions and syntax |
691 | ||
720e1c30 MV |
692 | ** Character classifiers work for non-ASCII characters. |
693 | ||
694 | The predicates `char-alphabetic?', `char-numeric?', | |
695 | `char-whitespace?', `char-lower?', `char-upper?' and `char-is-both?' | |
696 | no longer check whether their arguments are ASCII characters. | |
697 | Previously, a character would only be considered alphabetic when it | |
698 | was also ASCII, for example. | |
699 | ||
311b6a3c MV |
700 | ** Previously deprecated Scheme functions have been removed: |
701 | ||
702 | tag - no replacement. | |
703 | fseek - replaced by seek. | |
704 | list* - replaced by cons*. | |
705 | ||
706 | ** It's now possible to create modules with controlled environments | |
707 | ||
708 | Example: | |
709 | ||
710 | (use-modules (ice-9 safe)) | |
711 | (define m (make-safe-module)) | |
712 | ;;; m will now be a module containing only a safe subset of R5RS | |
713 | (eval '(+ 1 2) m) --> 3 | |
714 | (eval 'load m) --> ERROR: Unbound variable: load | |
715 | ||
716 | ** Evaluation of "()", the empty list, is now an error. | |
8c2c9967 MV |
717 | |
718 | Previously, the expression "()" evaluated to the empty list. This has | |
719 | been changed to signal a "missing expression" error. The correct way | |
720 | to write the empty list as a literal constant is to use quote: "'()". | |
721 | ||
311b6a3c MV |
722 | ** New concept of `Guile Extensions'. |
723 | ||
724 | A Guile Extension is just a ordinary shared library that can be linked | |
725 | at run-time. We found it advantageous to give this simple concept a | |
726 | dedicated name to distinguish the issues related to shared libraries | |
727 | from the issues related to the module system. | |
728 | ||
729 | *** New function: load-extension | |
730 | ||
731 | Executing (load-extension lib init) is mostly equivalent to | |
732 | ||
733 | (dynamic-call init (dynamic-link lib)) | |
734 | ||
735 | except when scm_register_extension has been called previously. | |
736 | Whenever appropriate, you should use `load-extension' instead of | |
737 | dynamic-link and dynamic-call. | |
738 | ||
739 | *** New C function: scm_c_register_extension | |
740 | ||
741 | This function registers a initialization function for use by | |
742 | `load-extension'. Use it when you don't want specific extensions to | |
743 | be loaded as shared libraries (for example on platforms that don't | |
744 | support dynamic linking). | |
745 | ||
8c2c9967 MV |
746 | ** Auto-loading of compiled-code modules is deprecated. |
747 | ||
748 | Guile used to be able to automatically find and link a shared | |
c10ecc4c | 749 | library to satisfy requests for a module. For example, the module |
8c2c9967 MV |
750 | `(foo bar)' could be implemented by placing a shared library named |
751 | "foo/libbar.so" (or with a different extension) in a directory on the | |
752 | load path of Guile. | |
753 | ||
311b6a3c MV |
754 | This has been found to be too tricky, and is no longer supported. The |
755 | shared libraries are now called "extensions". You should now write a | |
756 | small Scheme file that calls `load-extension' to load the shared | |
757 | library and initialize it explicitely. | |
8c2c9967 MV |
758 | |
759 | The shared libraries themselves should be installed in the usual | |
760 | places for shared libraries, with names like "libguile-foo-bar". | |
761 | ||
762 | For example, place this into a file "foo/bar.scm" | |
763 | ||
764 | (define-module (foo bar)) | |
765 | ||
311b6a3c MV |
766 | (load-extension "libguile-foo-bar" "foobar_init") |
767 | ||
768 | ** Backward incompatible change: eval EXP ENVIRONMENT-SPECIFIER | |
769 | ||
770 | `eval' is now R5RS, that is it takes two arguments. | |
771 | The second argument is an environment specifier, i.e. either | |
772 | ||
773 | (scheme-report-environment 5) | |
774 | (null-environment 5) | |
775 | (interaction-environment) | |
776 | ||
777 | or | |
8c2c9967 | 778 | |
311b6a3c | 779 | any module. |
8c2c9967 | 780 | |
6f76852b MV |
781 | ** The module system has been made more disciplined. |
782 | ||
311b6a3c MV |
783 | The function `eval' will save and restore the current module around |
784 | the evaluation of the specified expression. While this expression is | |
785 | evaluated, `(current-module)' will now return the right module, which | |
786 | is the module specified as the second argument to `eval'. | |
6f76852b | 787 | |
311b6a3c | 788 | A consequence of this change is that `eval' is not particularly |
6f76852b MV |
789 | useful when you want allow the evaluated code to change what module is |
790 | designated as the current module and have this change persist from one | |
791 | call to `eval' to the next. The read-eval-print-loop is an example | |
792 | where `eval' is now inadequate. To compensate, there is a new | |
793 | function `primitive-eval' that does not take a module specifier and | |
794 | that does not save/restore the current module. You should use this | |
795 | function together with `set-current-module', `current-module', etc | |
796 | when you want to have more control over the state that is carried from | |
797 | one eval to the next. | |
798 | ||
799 | Additionally, it has been made sure that forms that are evaluated at | |
800 | the top level are always evaluated with respect to the current module. | |
801 | Previously, subforms of top-level forms such as `begin', `case', | |
802 | etc. did not respect changes to the current module although these | |
803 | subforms are at the top-level as well. | |
804 | ||
311b6a3c | 805 | To prevent strange behavior, the forms `define-module', |
6f76852b MV |
806 | `use-modules', `use-syntax', and `export' have been restricted to only |
807 | work on the top level. The forms `define-public' and | |
808 | `defmacro-public' only export the new binding on the top level. They | |
809 | behave just like `define' and `defmacro', respectively, when they are | |
810 | used in a lexical environment. | |
811 | ||
0a892a2c MV |
812 | Also, `export' will no longer silently re-export bindings imported |
813 | from a used module. It will emit a `deprecation' warning and will | |
814 | cease to perform any re-export in the next version. If you actually | |
815 | want to re-export bindings, use the new `re-export' in place of | |
816 | `export'. The new `re-export' will not make copies of variables when | |
817 | rexporting them, as `export' did wrongly. | |
818 | ||
047dc3ae TTN |
819 | ** Module system now allows selection and renaming of imported bindings |
820 | ||
821 | Previously, when using `use-modules' or the `#:use-module' clause in | |
822 | the `define-module' form, all the bindings (association of symbols to | |
823 | values) for imported modules were added to the "current module" on an | |
824 | as-is basis. This has been changed to allow finer control through two | |
825 | new facilities: selection and renaming. | |
826 | ||
827 | You can now select which of the imported module's bindings are to be | |
828 | visible in the current module by using the `:select' clause. This | |
829 | clause also can be used to rename individual bindings. For example: | |
830 | ||
831 | ;; import all bindings no questions asked | |
832 | (use-modules (ice-9 common-list)) | |
833 | ||
834 | ;; import four bindings, renaming two of them; | |
835 | ;; the current module sees: every some zonk-y zonk-n | |
836 | (use-modules ((ice-9 common-list) | |
837 | :select (every some | |
838 | (remove-if . zonk-y) | |
839 | (remove-if-not . zonk-n)))) | |
840 | ||
841 | You can also programmatically rename all selected bindings using the | |
842 | `:renamer' clause, which specifies a proc that takes a symbol and | |
843 | returns another symbol. Because it is common practice to use a prefix, | |
844 | we now provide the convenience procedure `symbol-prefix-proc'. For | |
845 | example: | |
846 | ||
847 | ;; import four bindings, renaming two of them specifically, | |
848 | ;; and all four w/ prefix "CL:"; | |
849 | ;; the current module sees: CL:every CL:some CL:zonk-y CL:zonk-n | |
850 | (use-modules ((ice-9 common-list) | |
851 | :select (every some | |
852 | (remove-if . zonk-y) | |
853 | (remove-if-not . zonk-n)) | |
854 | :renamer (symbol-prefix-proc 'CL:))) | |
855 | ||
856 | ;; import four bindings, renaming two of them specifically, | |
857 | ;; and all four by upcasing. | |
858 | ;; the current module sees: EVERY SOME ZONK-Y ZONK-N | |
859 | (define (upcase-symbol sym) | |
860 | (string->symbol (string-upcase (symbol->string sym)))) | |
861 | ||
862 | (use-modules ((ice-9 common-list) | |
863 | :select (every some | |
864 | (remove-if . zonk-y) | |
865 | (remove-if-not . zonk-n)) | |
866 | :renamer upcase-symbol)) | |
867 | ||
868 | Note that programmatic renaming is done *after* individual renaming. | |
869 | Also, the above examples show `use-modules', but the same facilities are | |
870 | available for the `#:use-module' clause of `define-module'. | |
871 | ||
872 | See manual for more info. | |
873 | ||
b7d69200 | 874 | ** The semantics of guardians have changed. |
56495472 | 875 | |
b7d69200 | 876 | The changes are for the most part compatible. An important criterion |
6c0201ad | 877 | was to keep the typical usage of guardians as simple as before, but to |
c0a5d888 | 878 | make the semantics safer and (as a result) more useful. |
56495472 | 879 | |
c0a5d888 | 880 | *** All objects returned from guardians are now properly alive. |
56495472 | 881 | |
c0a5d888 ML |
882 | It is now guaranteed that any object referenced by an object returned |
883 | from a guardian is alive. It's now impossible for a guardian to | |
884 | return a "contained" object before its "containing" object. | |
56495472 ML |
885 | |
886 | One incompatible (but probably not very important) change resulting | |
887 | from this is that it is no longer possible to guard objects that | |
888 | indirectly reference themselves (i.e. are parts of cycles). If you do | |
889 | so accidentally, you'll get a warning. | |
890 | ||
c0a5d888 ML |
891 | *** There are now two types of guardians: greedy and sharing. |
892 | ||
893 | If you call (make-guardian #t) or just (make-guardian), you'll get a | |
894 | greedy guardian, and for (make-guardian #f) a sharing guardian. | |
895 | ||
896 | Greedy guardians are the default because they are more "defensive". | |
897 | You can only greedily guard an object once. If you guard an object | |
898 | more than once, once in a greedy guardian and the rest of times in | |
899 | sharing guardians, then it is guaranteed that the object won't be | |
900 | returned from sharing guardians as long as it is greedily guarded | |
901 | and/or alive. | |
902 | ||
903 | Guardians returned by calls to `make-guardian' can now take one more | |
904 | optional parameter, which says whether to throw an error in case an | |
905 | attempt is made to greedily guard an object that is already greedily | |
906 | guarded. The default is true, i.e. throw an error. If the parameter | |
907 | is false, the guardian invocation returns #t if guarding was | |
908 | successful and #f if it wasn't. | |
909 | ||
910 | Also, since greedy guarding is, in effect, a side-effecting operation | |
911 | on objects, a new function is introduced: `destroy-guardian!'. | |
912 | Invoking this function on a guardian renders it unoperative and, if | |
913 | the guardian is greedy, clears the "greedily guarded" property of the | |
914 | objects that were guarded by it, thus undoing the side effect. | |
915 | ||
916 | Note that all this hair is hardly very important, since guardian | |
917 | objects are usually permanent. | |
918 | ||
311b6a3c MV |
919 | ** Continuations created by call-with-current-continuation now accept |
920 | any number of arguments, as required by R5RS. | |
818febc0 | 921 | |
c10ecc4c | 922 | ** New function `issue-deprecation-warning' |
56426fdb | 923 | |
311b6a3c | 924 | This function is used to display the deprecation messages that are |
c10ecc4c | 925 | controlled by GUILE_WARN_DEPRECATION as explained in the README. |
56426fdb KN |
926 | |
927 | (define (id x) | |
c10ecc4c MV |
928 | (issue-deprecation-warning "`id' is deprecated. Use `identity' instead.") |
929 | (identity x)) | |
56426fdb KN |
930 | |
931 | guile> (id 1) | |
932 | ;; `id' is deprecated. Use `identity' instead. | |
933 | 1 | |
934 | guile> (id 1) | |
935 | 1 | |
936 | ||
c10ecc4c MV |
937 | ** New syntax `begin-deprecated' |
938 | ||
939 | When deprecated features are included (as determined by the configure | |
940 | option --enable-deprecated), `begin-deprecated' is identical to | |
941 | `begin'. When deprecated features are excluded, it always evaluates | |
942 | to `#f', ignoring the body forms. | |
943 | ||
17f367e0 MV |
944 | ** New function `make-object-property' |
945 | ||
946 | This function returns a new `procedure with setter' P that can be used | |
947 | to attach a property to objects. When calling P as | |
948 | ||
949 | (set! (P obj) val) | |
950 | ||
951 | where `obj' is any kind of object, it attaches `val' to `obj' in such | |
952 | a way that it can be retrieved by calling P as | |
953 | ||
954 | (P obj) | |
955 | ||
956 | This function will replace procedure properties, symbol properties and | |
957 | source properties eventually. | |
958 | ||
76ef92f3 MV |
959 | ** Module (ice-9 optargs) now uses keywords instead of `#&'. |
960 | ||
961 | Instead of #&optional, #&key, etc you should now use #:optional, | |
962 | #:key, etc. Since #:optional is a keyword, you can write it as just | |
963 | :optional when (read-set! keywords 'prefix) is active. | |
964 | ||
965 | The old reader syntax `#&' is still supported, but deprecated. It | |
966 | will be removed in the next release. | |
967 | ||
c0997079 MD |
968 | ** New define-module option: pure |
969 | ||
970 | Tells the module system not to include any bindings from the root | |
971 | module. | |
972 | ||
973 | Example: | |
974 | ||
975 | (define-module (totally-empty-module) | |
976 | :pure) | |
977 | ||
978 | ** New define-module option: export NAME1 ... | |
979 | ||
980 | Export names NAME1 ... | |
981 | ||
982 | This option is required if you want to be able to export bindings from | |
983 | a module which doesn't import one of `define-public' or `export'. | |
984 | ||
985 | Example: | |
986 | ||
311b6a3c MV |
987 | (define-module (foo) |
988 | :pure | |
989 | :use-module (ice-9 r5rs) | |
990 | :export (bar)) | |
69b5f65a | 991 | |
311b6a3c | 992 | ;;; Note that we're pure R5RS below this point! |
69b5f65a | 993 | |
311b6a3c MV |
994 | (define (bar) |
995 | ...) | |
daa6ba18 | 996 | |
1f3908c4 KN |
997 | ** New function: object->string OBJ |
998 | ||
999 | Return a Scheme string obtained by printing a given object. | |
1000 | ||
eb5c0a2a GH |
1001 | ** New function: port? X |
1002 | ||
1003 | Returns a boolean indicating whether X is a port. Equivalent to | |
1004 | `(or (input-port? X) (output-port? X))'. | |
1005 | ||
efa40607 DH |
1006 | ** New function: file-port? |
1007 | ||
1008 | Determines whether a given object is a port that is related to a file. | |
1009 | ||
34b56ec4 GH |
1010 | ** New function: port-for-each proc |
1011 | ||
311b6a3c MV |
1012 | Apply PROC to each port in the Guile port table in turn. The return |
1013 | value is unspecified. More specifically, PROC is applied exactly once | |
1014 | to every port that exists in the system at the time PORT-FOR-EACH is | |
1015 | invoked. Changes to the port table while PORT-FOR-EACH is running | |
1016 | have no effect as far as PORT-FOR-EACH is concerned. | |
34b56ec4 GH |
1017 | |
1018 | ** New function: dup2 oldfd newfd | |
1019 | ||
1020 | A simple wrapper for the `dup2' system call. Copies the file | |
1021 | descriptor OLDFD to descriptor number NEWFD, replacing the | |
1022 | previous meaning of NEWFD. Both OLDFD and NEWFD must be integers. | |
1023 | Unlike for dup->fdes or primitive-move->fdes, no attempt is made | |
264e9cbc | 1024 | to move away ports which are using NEWFD. The return value is |
34b56ec4 GH |
1025 | unspecified. |
1026 | ||
1027 | ** New function: close-fdes fd | |
1028 | ||
1029 | A simple wrapper for the `close' system call. Close file | |
1030 | descriptor FD, which must be an integer. Unlike close (*note | |
1031 | close: Ports and File Descriptors.), the file descriptor will be | |
1032 | closed even if a port is using it. The return value is | |
1033 | unspecified. | |
1034 | ||
94e6d793 MG |
1035 | ** New function: crypt password salt |
1036 | ||
1037 | Encrypts `password' using the standard unix password encryption | |
1038 | algorithm. | |
1039 | ||
1040 | ** New function: chroot path | |
1041 | ||
1042 | Change the root directory of the running process to `path'. | |
1043 | ||
1044 | ** New functions: getlogin, cuserid | |
1045 | ||
1046 | Return the login name or the user name of the current effective user | |
1047 | id, respectively. | |
1048 | ||
1049 | ** New functions: getpriority which who, setpriority which who prio | |
1050 | ||
1051 | Get or set the priority of the running process. | |
1052 | ||
1053 | ** New function: getpass prompt | |
1054 | ||
1055 | Read a password from the terminal, first displaying `prompt' and | |
1056 | disabling echoing. | |
1057 | ||
1058 | ** New function: flock file operation | |
1059 | ||
1060 | Set/remove an advisory shared or exclusive lock on `file'. | |
1061 | ||
1062 | ** New functions: sethostname name, gethostname | |
1063 | ||
1064 | Set or get the hostname of the machine the current process is running | |
1065 | on. | |
1066 | ||
6d163216 | 1067 | ** New function: mkstemp! tmpl |
4f60cc33 | 1068 | |
6d163216 GH |
1069 | mkstemp creates a new unique file in the file system and returns a |
1070 | new buffered port open for reading and writing to the file. TMPL | |
1071 | is a string specifying where the file should be created: it must | |
1072 | end with `XXXXXX' and will be changed in place to return the name | |
1073 | of the temporary file. | |
1074 | ||
62e63ba9 MG |
1075 | ** New function: open-input-string string |
1076 | ||
1077 | Return an input string port which delivers the characters from | |
4f60cc33 | 1078 | `string'. This procedure, together with `open-output-string' and |
62e63ba9 MG |
1079 | `get-output-string' implements SRFI-6. |
1080 | ||
1081 | ** New function: open-output-string | |
1082 | ||
1083 | Return an output string port which collects all data written to it. | |
1084 | The data can then be retrieved by `get-output-string'. | |
1085 | ||
1086 | ** New function: get-output-string | |
1087 | ||
1088 | Return the contents of an output string port. | |
1089 | ||
56426fdb KN |
1090 | ** New function: identity |
1091 | ||
1092 | Return the argument. | |
1093 | ||
5bef627d GH |
1094 | ** socket, connect, accept etc., now have support for IPv6. IPv6 addresses |
1095 | are represented in Scheme as integers with normal host byte ordering. | |
1096 | ||
1097 | ** New function: inet-pton family address | |
1098 | ||
311b6a3c MV |
1099 | Convert a printable string network address into an integer. Note that |
1100 | unlike the C version of this function, the result is an integer with | |
1101 | normal host byte ordering. FAMILY can be `AF_INET' or `AF_INET6'. | |
1102 | e.g., | |
1103 | ||
1104 | (inet-pton AF_INET "127.0.0.1") => 2130706433 | |
1105 | (inet-pton AF_INET6 "::1") => 1 | |
5bef627d GH |
1106 | |
1107 | ** New function: inet-ntop family address | |
1108 | ||
311b6a3c MV |
1109 | Convert an integer network address into a printable string. Note that |
1110 | unlike the C version of this function, the input is an integer with | |
1111 | normal host byte ordering. FAMILY can be `AF_INET' or `AF_INET6'. | |
1112 | e.g., | |
1113 | ||
1114 | (inet-ntop AF_INET 2130706433) => "127.0.0.1" | |
1115 | (inet-ntop AF_INET6 (- (expt 2 128) 1)) => | |
5bef627d GH |
1116 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff |
1117 | ||
56426fdb KN |
1118 | ** Deprecated: id |
1119 | ||
1120 | Use `identity' instead. | |
1121 | ||
5cd06d5e DH |
1122 | ** Deprecated: -1+ |
1123 | ||
1124 | Use `1-' instead. | |
1125 | ||
1126 | ** Deprecated: return-it | |
1127 | ||
311b6a3c | 1128 | Do without it. |
5cd06d5e DH |
1129 | |
1130 | ** Deprecated: string-character-length | |
1131 | ||
1132 | Use `string-length' instead. | |
1133 | ||
1134 | ** Deprecated: flags | |
1135 | ||
1136 | Use `logior' instead. | |
1137 | ||
4f60cc33 NJ |
1138 | ** Deprecated: close-all-ports-except. |
1139 | ||
1140 | This was intended for closing ports in a child process after a fork, | |
1141 | but it has the undesirable side effect of flushing buffers. | |
1142 | port-for-each is more flexible. | |
34b56ec4 GH |
1143 | |
1144 | ** The (ice-9 popen) module now attempts to set up file descriptors in | |
1145 | the child process from the current Scheme ports, instead of using the | |
1146 | current values of file descriptors 0, 1, and 2 in the parent process. | |
1147 | ||
b52e071b DH |
1148 | ** Removed function: builtin-weak-bindings |
1149 | ||
1150 | There is no such concept as a weak binding any more. | |
1151 | ||
9d774814 | 1152 | ** Removed constants: bignum-radix, scm-line-incrementors |
0f979f3f | 1153 | |
7d435120 MD |
1154 | ** define-method: New syntax mandatory. |
1155 | ||
1156 | The new method syntax is now mandatory: | |
1157 | ||
1158 | (define-method (NAME ARG-SPEC ...) BODY ...) | |
1159 | (define-method (NAME ARG-SPEC ... . REST-ARG) BODY ...) | |
1160 | ||
1161 | ARG-SPEC ::= ARG-NAME | (ARG-NAME TYPE) | |
1162 | REST-ARG ::= ARG-NAME | |
1163 | ||
1164 | If you have old code using the old syntax, import | |
1165 | (oop goops old-define-method) before (oop goops) as in: | |
1166 | ||
1167 | (use-modules (oop goops old-define-method) (oop goops)) | |
1168 | ||
f3f9dcbc MV |
1169 | ** Deprecated function: builtin-variable |
1170 | Removed function: builtin-bindings | |
1171 | ||
1172 | There is no longer a distinction between builtin or other variables. | |
1173 | Use module system operations for all variables. | |
1174 | ||
311b6a3c MV |
1175 | ** Lazy-catch handlers are no longer allowed to return. |
1176 | ||
1177 | That is, a call to `throw', `error', etc is now guaranteed to not | |
1178 | return. | |
1179 | ||
a583bf1e | 1180 | ** Bugfixes for (ice-9 getopt-long) |
8c84b81e | 1181 | |
a583bf1e TTN |
1182 | This module is now tested using test-suite/tests/getopt-long.test. |
1183 | The following bugs have been fixed: | |
1184 | ||
1185 | *** Parsing for options that are specified to have `optional' args now checks | |
1186 | if the next element is an option instead of unconditionally taking it as the | |
8c84b81e TTN |
1187 | option arg. |
1188 | ||
a583bf1e TTN |
1189 | *** An error is now thrown for `--opt=val' when the option description |
1190 | does not specify `(value #t)' or `(value optional)'. This condition used to | |
1191 | be accepted w/o error, contrary to the documentation. | |
1192 | ||
1193 | *** The error message for unrecognized options is now more informative. | |
1194 | It used to be "not a record", an artifact of the implementation. | |
1195 | ||
1196 | *** The error message for `--opt' terminating the arg list (no value), when | |
1197 | `(value #t)' is specified, is now more informative. It used to be "not enough | |
1198 | args". | |
1199 | ||
1200 | *** "Clumped" single-char args now preserve trailing string, use it as arg. | |
1201 | The expansion used to be like so: | |
1202 | ||
1203 | ("-abc5d" "--xyz") => ("-a" "-b" "-c" "--xyz") | |
1204 | ||
1205 | Note that the "5d" is dropped. Now it is like so: | |
1206 | ||
1207 | ("-abc5d" "--xyz") => ("-a" "-b" "-c" "5d" "--xyz") | |
1208 | ||
1209 | This enables single-char options to have adjoining arguments as long as their | |
1210 | constituent characters are not potential single-char options. | |
8c84b81e | 1211 | |
998bfc70 TTN |
1212 | ** (ice-9 session) procedure `arity' now works with (ice-9 optargs) `lambda*' |
1213 | ||
1214 | The `lambda*' and derivative forms in (ice-9 optargs) now set a procedure | |
1215 | property `arglist', which can be retrieved by `arity'. The result is that | |
1216 | `arity' can give more detailed information than before: | |
1217 | ||
1218 | Before: | |
1219 | ||
1220 | guile> (use-modules (ice-9 optargs)) | |
1221 | guile> (define* (foo #:optional a b c) a) | |
1222 | guile> (arity foo) | |
1223 | 0 or more arguments in `lambda*:G0'. | |
1224 | ||
1225 | After: | |
1226 | ||
1227 | guile> (arity foo) | |
1228 | 3 optional arguments: `a', `b' and `c'. | |
1229 | guile> (define* (bar a b #:key c d #:allow-other-keys) a) | |
1230 | guile> (arity bar) | |
1231 | 2 required arguments: `a' and `b', 2 keyword arguments: `c' | |
1232 | and `d', other keywords allowed. | |
1233 | guile> (define* (baz a b #:optional c #:rest r) a) | |
1234 | guile> (arity baz) | |
1235 | 2 required arguments: `a' and `b', 1 optional argument: `c', | |
1236 | the rest in `r'. | |
1237 | ||
311b6a3c MV |
1238 | * Changes to the C interface |
1239 | ||
c81c130e MV |
1240 | ** Types have been renamed from scm_*_t to scm_t_*. |
1241 | ||
1242 | This has been done for POSIX sake. It reserves identifiers ending | |
1243 | with "_t". What a concept. | |
1244 | ||
1245 | The old names are still available with status `deprecated'. | |
1246 | ||
1247 | ** scm_t_bits (former scm_bits_t) is now a unsigned type. | |
1248 | ||
6e9382f1 | 1249 | ** Deprecated features have been removed. |
e6c9e497 MV |
1250 | |
1251 | *** Macros removed | |
1252 | ||
1253 | SCM_INPORTP, SCM_OUTPORTP SCM_ICHRP, SCM_ICHR, SCM_MAKICHR | |
1254 | SCM_SETJMPBUF SCM_NSTRINGP SCM_NRWSTRINGP SCM_NVECTORP SCM_DOUBLE_CELLP | |
1255 | ||
1256 | *** C Functions removed | |
1257 | ||
1258 | scm_sysmissing scm_tag scm_tc16_flo scm_tc_flo | |
1259 | scm_fseek - replaced by scm_seek. | |
1260 | gc-thunk - replaced by after-gc-hook. | |
1261 | gh_int2scmb - replaced by gh_bool2scm. | |
1262 | scm_tc_dblr - replaced by scm_tc16_real. | |
1263 | scm_tc_dblc - replaced by scm_tc16_complex. | |
1264 | scm_list_star - replaced by scm_cons_star. | |
1265 | ||
36284627 DH |
1266 | ** Deprecated: scm_makfromstr |
1267 | ||
1268 | Use scm_mem2string instead. | |
1269 | ||
311b6a3c MV |
1270 | ** Deprecated: scm_make_shared_substring |
1271 | ||
1272 | Explicit shared substrings will disappear from Guile. | |
1273 | ||
1274 | Instead, "normal" strings will be implemented using sharing | |
1275 | internally, combined with a copy-on-write strategy. | |
1276 | ||
1277 | ** Deprecated: scm_read_only_string_p | |
1278 | ||
1279 | The concept of read-only strings will disappear in next release of | |
1280 | Guile. | |
1281 | ||
1282 | ** Deprecated: scm_sloppy_memq, scm_sloppy_memv, scm_sloppy_member | |
c299f186 | 1283 | |
311b6a3c | 1284 | Instead, use scm_c_memq or scm_memq, scm_memv, scm_member. |
c299f186 | 1285 | |
dd0e04ed KN |
1286 | ** New functions: scm_call_0, scm_call_1, scm_call_2, scm_call_3 |
1287 | ||
1288 | Call a procedure with the indicated number of arguments. | |
1289 | ||
1290 | Example: | |
1291 | ||
1292 | scm_call_1 (proc, arg1); | |
1293 | ||
1294 | ** New functions: scm_apply_0, scm_apply_1, scm_apply_2, scm_apply_3 | |
1295 | ||
1296 | Call a procedure with the indicated number of arguments and a list | |
1297 | of arguments. | |
1298 | ||
1299 | Example: | |
1300 | ||
1301 | scm_apply_1 (proc, arg1, args); | |
1302 | ||
e235f2a6 KN |
1303 | ** New functions: scm_list_1, scm_list_2, scm_list_3, scm_list_4, scm_list_5 |
1304 | ||
1305 | Create a list of the given number of elements. | |
1306 | ||
1307 | ** Renamed function: scm_listify has been replaced by scm_list_n. | |
1308 | ||
1309 | ** Deprecated macros: SCM_LIST0, SCM_LIST1, SCM_LIST2, SCM_LIST3, SCM_LIST4, | |
1310 | SCM_LIST5, SCM_LIST6, SCM_LIST7, SCM_LIST8, SCM_LIST9. | |
1311 | ||
1312 | Use functions scm_list_N instead. | |
1313 | ||
6fe692e9 MD |
1314 | ** New function: scm_c_read (SCM port, void *buffer, scm_sizet size) |
1315 | ||
1316 | Used by an application to read arbitrary number of bytes from a port. | |
1317 | Same semantics as libc read, except that scm_c_read only returns less | |
1318 | than SIZE bytes if at end-of-file. | |
1319 | ||
1320 | Warning: Doesn't update port line and column counts! | |
1321 | ||
1322 | ** New function: scm_c_write (SCM port, const void *ptr, scm_sizet size) | |
1323 | ||
1324 | Used by an application to write arbitrary number of bytes to an SCM | |
1325 | port. Similar semantics as libc write. However, unlike libc | |
1326 | write, scm_c_write writes the requested number of bytes and has no | |
1327 | return value. | |
1328 | ||
1329 | Warning: Doesn't update port line and column counts! | |
1330 | ||
17f367e0 MV |
1331 | ** New function: scm_init_guile () |
1332 | ||
1333 | In contrast to scm_boot_guile, scm_init_guile will return normally | |
1334 | after initializing Guile. It is not available on all systems, tho. | |
1335 | ||
23ade5e7 DH |
1336 | ** New functions: scm_str2symbol, scm_mem2symbol |
1337 | ||
1338 | The function scm_str2symbol takes a const char* pointing to a zero-terminated | |
1339 | field of characters and creates a scheme symbol object from that C string. | |
1340 | The function scm_mem2symbol takes a const char* and a number of characters and | |
1341 | creates a symbol from the characters in that memory area. | |
1342 | ||
17f367e0 MV |
1343 | ** New functions: scm_primitive_make_property |
1344 | scm_primitive_property_ref | |
1345 | scm_primitive_property_set_x | |
1346 | scm_primitive_property_del_x | |
1347 | ||
1348 | These functions implement a new way to deal with object properties. | |
1349 | See libguile/properties.c for their documentation. | |
1350 | ||
9d47a1e6 ML |
1351 | ** New function: scm_done_free (long size) |
1352 | ||
1353 | This function is the inverse of scm_done_malloc. Use it to report the | |
1354 | amount of smob memory you free. The previous method, which involved | |
1355 | calling scm_done_malloc with negative argument, was somewhat | |
1356 | unintuitive (and is still available, of course). | |
1357 | ||
79a3dafe DH |
1358 | ** New function: scm_c_memq (SCM obj, SCM list) |
1359 | ||
1360 | This function provides a fast C level alternative for scm_memq for the case | |
1361 | that the list parameter is known to be a proper list. The function is a | |
1362 | replacement for scm_sloppy_memq, but is stricter in its requirements on its | |
1363 | list input parameter, since for anything else but a proper list the function's | |
1364 | behaviour is undefined - it may even crash or loop endlessly. Further, for | |
1365 | the case that the object is not found in the list, scm_c_memq returns #f which | |
1366 | is similar to scm_memq, but different from scm_sloppy_memq's behaviour. | |
1367 | ||
6c0201ad | 1368 | ** New functions: scm_remember_upto_here_1, scm_remember_upto_here_2, |
5d2b97cd DH |
1369 | scm_remember_upto_here |
1370 | ||
1371 | These functions replace the function scm_remember. | |
1372 | ||
1373 | ** Deprecated function: scm_remember | |
1374 | ||
1375 | Use one of the new functions scm_remember_upto_here_1, | |
1376 | scm_remember_upto_here_2 or scm_remember_upto_here instead. | |
1377 | ||
be54b15d DH |
1378 | ** New function: scm_allocate_string |
1379 | ||
1380 | This function replaces the function scm_makstr. | |
1381 | ||
1382 | ** Deprecated function: scm_makstr | |
1383 | ||
1384 | Use the new function scm_allocate_string instead. | |
1385 | ||
32d0d4b1 DH |
1386 | ** New global variable scm_gc_running_p introduced. |
1387 | ||
1388 | Use this variable to find out if garbage collection is being executed. Up to | |
1389 | now applications have used scm_gc_heap_lock to test if garbage collection was | |
1390 | running, which also works because of the fact that up to know only the garbage | |
1391 | collector has set this variable. But, this is an implementation detail that | |
1392 | may change. Further, scm_gc_heap_lock is not set throughout gc, thus the use | |
1393 | of this variable is (and has been) not fully safe anyway. | |
1394 | ||
5b9eb8ae DH |
1395 | ** New macros: SCM_BITVECTOR_MAX_LENGTH, SCM_UVECTOR_MAX_LENGTH |
1396 | ||
1397 | Use these instead of SCM_LENGTH_MAX. | |
1398 | ||
6c0201ad | 1399 | ** New macros: SCM_CONTINUATION_LENGTH, SCM_CCLO_LENGTH, SCM_STACK_LENGTH, |
a6d9e5ab DH |
1400 | SCM_STRING_LENGTH, SCM_SYMBOL_LENGTH, SCM_UVECTOR_LENGTH, |
1401 | SCM_BITVECTOR_LENGTH, SCM_VECTOR_LENGTH. | |
1402 | ||
1403 | Use these instead of SCM_LENGTH. | |
1404 | ||
6c0201ad | 1405 | ** New macros: SCM_SET_CONTINUATION_LENGTH, SCM_SET_STRING_LENGTH, |
93778877 DH |
1406 | SCM_SET_SYMBOL_LENGTH, SCM_SET_VECTOR_LENGTH, SCM_SET_UVECTOR_LENGTH, |
1407 | SCM_SET_BITVECTOR_LENGTH | |
bc0eaf7b DH |
1408 | |
1409 | Use these instead of SCM_SETLENGTH | |
1410 | ||
6c0201ad | 1411 | ** New macros: SCM_STRING_CHARS, SCM_SYMBOL_CHARS, SCM_CCLO_BASE, |
a6d9e5ab DH |
1412 | SCM_VECTOR_BASE, SCM_UVECTOR_BASE, SCM_BITVECTOR_BASE, SCM_COMPLEX_MEM, |
1413 | SCM_ARRAY_MEM | |
1414 | ||
e51fe79c DH |
1415 | Use these instead of SCM_CHARS, SCM_UCHARS, SCM_ROCHARS, SCM_ROUCHARS or |
1416 | SCM_VELTS. | |
a6d9e5ab | 1417 | |
6c0201ad | 1418 | ** New macros: SCM_SET_BIGNUM_BASE, SCM_SET_STRING_CHARS, |
6a0476fd DH |
1419 | SCM_SET_SYMBOL_CHARS, SCM_SET_UVECTOR_BASE, SCM_SET_BITVECTOR_BASE, |
1420 | SCM_SET_VECTOR_BASE | |
1421 | ||
1422 | Use these instead of SCM_SETCHARS. | |
1423 | ||
a6d9e5ab DH |
1424 | ** New macro: SCM_BITVECTOR_P |
1425 | ||
1426 | ** New macro: SCM_STRING_COERCE_0TERMINATION_X | |
1427 | ||
1428 | Use instead of SCM_COERCE_SUBSTR. | |
1429 | ||
30ea841d DH |
1430 | ** New macros: SCM_DIR_OPEN_P, SCM_DIR_FLAG_OPEN |
1431 | ||
1432 | For directory objects, use these instead of SCM_OPDIRP and SCM_OPN. | |
1433 | ||
6c0201ad TTN |
1434 | ** Deprecated macros: SCM_OUTOFRANGE, SCM_NALLOC, SCM_HUP_SIGNAL, |
1435 | SCM_INT_SIGNAL, SCM_FPE_SIGNAL, SCM_BUS_SIGNAL, SCM_SEGV_SIGNAL, | |
1436 | SCM_ALRM_SIGNAL, SCM_GC_SIGNAL, SCM_TICK_SIGNAL, SCM_SIG_ORD, | |
d1ca2c64 | 1437 | SCM_ORD_SIG, SCM_NUM_SIGS, SCM_SYMBOL_SLOTS, SCM_SLOTS, SCM_SLOPPY_STRINGP, |
a6d9e5ab DH |
1438 | SCM_VALIDATE_STRINGORSUBSTR, SCM_FREEP, SCM_NFREEP, SCM_CHARS, SCM_UCHARS, |
1439 | SCM_VALIDATE_ROSTRING, SCM_VALIDATE_ROSTRING_COPY, | |
1440 | SCM_VALIDATE_NULLORROSTRING_COPY, SCM_ROLENGTH, SCM_LENGTH, SCM_HUGE_LENGTH, | |
b24b5e13 | 1441 | SCM_SUBSTRP, SCM_SUBSTR_STR, SCM_SUBSTR_OFFSET, SCM_COERCE_SUBSTR, |
34f0f2b8 | 1442 | SCM_ROSTRINGP, SCM_RWSTRINGP, SCM_VALIDATE_RWSTRING, SCM_ROCHARS, |
fd336365 | 1443 | SCM_ROUCHARS, SCM_SETLENGTH, SCM_SETCHARS, SCM_LENGTH_MAX, SCM_GC8MARKP, |
30ea841d | 1444 | SCM_SETGC8MARK, SCM_CLRGC8MARK, SCM_GCTYP16, SCM_GCCDR, SCM_SUBR_DOC, |
b3fcac34 DH |
1445 | SCM_OPDIRP, SCM_VALIDATE_OPDIR, SCM_WTA, RETURN_SCM_WTA, SCM_CONST_LONG, |
1446 | SCM_WNA, SCM_FUNC_NAME, SCM_VALIDATE_NUMBER_COPY, | |
61045190 | 1447 | SCM_VALIDATE_NUMBER_DEF_COPY, SCM_SLOPPY_CONSP, SCM_SLOPPY_NCONSP, |
e038c042 | 1448 | SCM_SETAND_CDR, SCM_SETOR_CDR, SCM_SETAND_CAR, SCM_SETOR_CAR |
b63a956d DH |
1449 | |
1450 | Use SCM_ASSERT_RANGE or SCM_VALIDATE_XXX_RANGE instead of SCM_OUTOFRANGE. | |
1451 | Use scm_memory_error instead of SCM_NALLOC. | |
c1aef037 | 1452 | Use SCM_STRINGP instead of SCM_SLOPPY_STRINGP. |
d1ca2c64 DH |
1453 | Use SCM_VALIDATE_STRING instead of SCM_VALIDATE_STRINGORSUBSTR. |
1454 | Use SCM_FREE_CELL_P instead of SCM_FREEP/SCM_NFREEP | |
a6d9e5ab | 1455 | Use a type specific accessor macro instead of SCM_CHARS/SCM_UCHARS. |
6c0201ad | 1456 | Use a type specific accessor instead of SCM(_|_RO|_HUGE_)LENGTH. |
a6d9e5ab DH |
1457 | Use SCM_VALIDATE_(SYMBOL|STRING) instead of SCM_VALIDATE_ROSTRING. |
1458 | Use SCM_STRING_COERCE_0TERMINATION_X instead of SCM_COERCE_SUBSTR. | |
b24b5e13 | 1459 | Use SCM_STRINGP or SCM_SYMBOLP instead of SCM_ROSTRINGP. |
f0942910 DH |
1460 | Use SCM_STRINGP instead of SCM_RWSTRINGP. |
1461 | Use SCM_VALIDATE_STRING instead of SCM_VALIDATE_RWSTRING. | |
34f0f2b8 DH |
1462 | Use SCM_STRING_CHARS instead of SCM_ROCHARS. |
1463 | Use SCM_STRING_UCHARS instead of SCM_ROUCHARS. | |
93778877 | 1464 | Use a type specific setter macro instead of SCM_SETLENGTH. |
6a0476fd | 1465 | Use a type specific setter macro instead of SCM_SETCHARS. |
5b9eb8ae | 1466 | Use a type specific length macro instead of SCM_LENGTH_MAX. |
fd336365 DH |
1467 | Use SCM_GCMARKP instead of SCM_GC8MARKP. |
1468 | Use SCM_SETGCMARK instead of SCM_SETGC8MARK. | |
1469 | Use SCM_CLRGCMARK instead of SCM_CLRGC8MARK. | |
1470 | Use SCM_TYP16 instead of SCM_GCTYP16. | |
1471 | Use SCM_CDR instead of SCM_GCCDR. | |
30ea841d | 1472 | Use SCM_DIR_OPEN_P instead of SCM_OPDIRP. |
276dd677 DH |
1473 | Use SCM_MISC_ERROR or SCM_WRONG_TYPE_ARG instead of SCM_WTA. |
1474 | Use SCM_MISC_ERROR or SCM_WRONG_TYPE_ARG instead of RETURN_SCM_WTA. | |
8dea8611 | 1475 | Use SCM_VCELL_INIT instead of SCM_CONST_LONG. |
b3fcac34 | 1476 | Use SCM_WRONG_NUM_ARGS instead of SCM_WNA. |
ced99e92 DH |
1477 | Use SCM_CONSP instead of SCM_SLOPPY_CONSP. |
1478 | Use !SCM_CONSP instead of SCM_SLOPPY_NCONSP. | |
b63a956d | 1479 | |
f7620510 DH |
1480 | ** Removed function: scm_struct_init |
1481 | ||
93d40df2 DH |
1482 | ** Removed variable: scm_symhash_dim |
1483 | ||
818febc0 GH |
1484 | ** Renamed function: scm_make_cont has been replaced by |
1485 | scm_make_continuation, which has a different interface. | |
1486 | ||
cc4feeca DH |
1487 | ** Deprecated function: scm_call_catching_errors |
1488 | ||
1489 | Use scm_catch or scm_lazy_catch from throw.[ch] instead. | |
1490 | ||
28b06554 DH |
1491 | ** Deprecated function: scm_strhash |
1492 | ||
1493 | Use scm_string_hash instead. | |
1494 | ||
1b9be268 DH |
1495 | ** Deprecated function: scm_vector_set_length_x |
1496 | ||
1497 | Instead, create a fresh vector of the desired size and copy the contents. | |
1498 | ||
302f229e MD |
1499 | ** scm_gensym has changed prototype |
1500 | ||
1501 | scm_gensym now only takes one argument. | |
1502 | ||
1660782e DH |
1503 | ** Deprecated type tags: scm_tc7_ssymbol, scm_tc7_msymbol, scm_tcs_symbols, |
1504 | scm_tc7_lvector | |
28b06554 DH |
1505 | |
1506 | There is now only a single symbol type scm_tc7_symbol. | |
1660782e | 1507 | The tag scm_tc7_lvector was not used anyway. |
28b06554 | 1508 | |
2f6fb7c5 KN |
1509 | ** Deprecated function: scm_make_smob_type_mfpe, scm_set_smob_mfpe. |
1510 | ||
1511 | Use scm_make_smob_type and scm_set_smob_XXX instead. | |
1512 | ||
1513 | ** New function scm_set_smob_apply. | |
1514 | ||
1515 | This can be used to set an apply function to a smob type. | |
1516 | ||
1f3908c4 KN |
1517 | ** Deprecated function: scm_strprint_obj |
1518 | ||
1519 | Use scm_object_to_string instead. | |
1520 | ||
b3fcac34 DH |
1521 | ** Deprecated function: scm_wta |
1522 | ||
1523 | Use scm_wrong_type_arg, or another appropriate error signalling function | |
1524 | instead. | |
1525 | ||
f3f9dcbc MV |
1526 | ** Explicit support for obarrays has been deprecated. |
1527 | ||
1528 | Use `scm_str2symbol' and the generic hashtable functions instead. | |
1529 | ||
1530 | ** The concept of `vcells' has been deprecated. | |
1531 | ||
1532 | The data type `variable' is now used exclusively. `Vcells' have been | |
1533 | a low-level concept so you are likely not affected by this change. | |
1534 | ||
1535 | *** Deprecated functions: scm_sym2vcell, scm_sysintern, | |
1536 | scm_sysintern0, scm_symbol_value0, scm_intern, scm_intern0. | |
1537 | ||
1538 | Use scm_c_define or scm_c_lookup instead, as appropriate. | |
1539 | ||
1540 | *** New functions: scm_c_module_lookup, scm_c_lookup, | |
1541 | scm_c_module_define, scm_c_define, scm_module_lookup, scm_lookup, | |
1542 | scm_module_define, scm_define. | |
1543 | ||
1544 | These functions work with variables instead of with vcells. | |
1545 | ||
311b6a3c MV |
1546 | ** New functions for creating and defining `subr's and `gsubr's. |
1547 | ||
1548 | The new functions more clearly distinguish between creating a subr (or | |
1549 | gsubr) object and adding it to the current module. | |
1550 | ||
1551 | These new functions are available: scm_c_make_subr, scm_c_define_subr, | |
1552 | scm_c_make_subr_with_generic, scm_c_define_subr_with_generic, | |
1553 | scm_c_make_gsubr, scm_c_define_gsubr, scm_c_make_gsubr_with_generic, | |
1554 | scm_c_define_gsubr_with_generic. | |
1555 | ||
1556 | ** Deprecated functions: scm_make_subr, scm_make_subr_opt, | |
1557 | scm_make_subr_with_generic, scm_make_gsubr, | |
1558 | scm_make_gsubr_with_generic. | |
1559 | ||
1560 | Use the new ones from above instead. | |
1561 | ||
1562 | ** C interface to the module system has changed. | |
1563 | ||
1564 | While we suggest that you avoid as many explicit module system | |
1565 | operations from C as possible for the time being, the C interface has | |
1566 | been made more similar to the high-level Scheme module system. | |
1567 | ||
1568 | *** New functions: scm_c_define_module, scm_c_use_module, | |
1569 | scm_c_export, scm_c_resolve_module. | |
1570 | ||
1571 | They mostly work like their Scheme namesakes. scm_c_define_module | |
1572 | takes a function that is called a context where the new module is | |
1573 | current. | |
1574 | ||
1575 | *** Deprecated functions: scm_the_root_module, scm_make_module, | |
1576 | scm_ensure_user_module, scm_load_scheme_module. | |
1577 | ||
1578 | Use the new functions instead. | |
1579 | ||
1580 | ** Renamed function: scm_internal_with_fluids becomes | |
1581 | scm_c_with_fluids. | |
1582 | ||
1583 | scm_internal_with_fluids is available as a deprecated function. | |
1584 | ||
1585 | ** New function: scm_c_with_fluid. | |
1586 | ||
1587 | Just like scm_c_with_fluids, but takes one fluid and one value instead | |
1588 | of lists of same. | |
1589 | ||
1be6b49c ML |
1590 | ** Deprecated typedefs: long_long, ulong_long. |
1591 | ||
1592 | They are of questionable utility and they pollute the global | |
1593 | namespace. | |
1594 | ||
1be6b49c ML |
1595 | ** Deprecated typedef: scm_sizet |
1596 | ||
1597 | It is of questionable utility now that Guile requires ANSI C, and is | |
1598 | oddly named. | |
1599 | ||
1600 | ** Deprecated typedefs: scm_port_rw_active, scm_port, | |
1601 | scm_ptob_descriptor, scm_debug_info, scm_debug_frame, scm_fport, | |
1602 | scm_option, scm_rstate, scm_rng, scm_array, scm_array_dim. | |
1603 | ||
1604 | Made more compliant with the naming policy by adding a _t at the end. | |
1605 | ||
1606 | ** Deprecated functions: scm_mkbig, scm_big2num, scm_adjbig, | |
1607 | scm_normbig, scm_copybig, scm_2ulong2big, scm_dbl2big, scm_big2dbl | |
1608 | ||
373f4948 | 1609 | With the exception of the mysterious scm_2ulong2big, they are still |
1be6b49c ML |
1610 | available under new names (scm_i_mkbig etc). These functions are not |
1611 | intended to be used in user code. You should avoid dealing with | |
1612 | bignums directly, and should deal with numbers in general (which can | |
1613 | be bignums). | |
1614 | ||
147c18a0 MD |
1615 | ** Change in behavior: scm_num2long, scm_num2ulong |
1616 | ||
1617 | The scm_num2[u]long functions don't any longer accept an inexact | |
1618 | argument. This change in behavior is motivated by concordance with | |
1619 | R5RS: It is more common that a primitive doesn't want to accept an | |
1620 | inexact for an exact. | |
1621 | ||
1be6b49c | 1622 | ** New functions: scm_short2num, scm_ushort2num, scm_int2num, |
f3f70257 ML |
1623 | scm_uint2num, scm_size2num, scm_ptrdiff2num, scm_num2short, |
1624 | scm_num2ushort, scm_num2int, scm_num2uint, scm_num2ptrdiff, | |
1be6b49c ML |
1625 | scm_num2size. |
1626 | ||
1627 | These are conversion functions between the various ANSI C integral | |
147c18a0 MD |
1628 | types and Scheme numbers. NOTE: The scm_num2xxx functions don't |
1629 | accept an inexact argument. | |
1be6b49c | 1630 | |
5437598b MD |
1631 | ** New functions: scm_float2num, scm_double2num, |
1632 | scm_num2float, scm_num2double. | |
1633 | ||
1634 | These are conversion functions between the two ANSI C float types and | |
1635 | Scheme numbers. | |
1636 | ||
1be6b49c | 1637 | ** New number validation macros: |
f3f70257 | 1638 | SCM_NUM2{SIZE,PTRDIFF,SHORT,USHORT,INT,UINT}[_DEF] |
1be6b49c ML |
1639 | |
1640 | See above. | |
1641 | ||
fc62c86a ML |
1642 | ** New functions: scm_gc_protect_object, scm_gc_unprotect_object |
1643 | ||
1644 | These are just nicer-named old scm_protect_object and | |
1645 | scm_unprotect_object. | |
1646 | ||
1647 | ** Deprecated functions: scm_protect_object, scm_unprotect_object | |
1648 | ||
1649 | ** New functions: scm_gc_[un]register_root, scm_gc_[un]register_roots | |
1650 | ||
1651 | These functions can be used to register pointers to locations that | |
1652 | hold SCM values. | |
1653 | ||
5b2ad23b ML |
1654 | ** Deprecated function: scm_create_hook. |
1655 | ||
1656 | Its sins are: misleading name, non-modularity and lack of general | |
1657 | usefulness. | |
1658 | ||
c299f186 | 1659 | \f |
cc36e791 JB |
1660 | Changes since Guile 1.3.4: |
1661 | ||
80f27102 JB |
1662 | * Changes to the distribution |
1663 | ||
ce358662 JB |
1664 | ** Trees from nightly snapshots and CVS now require you to run autogen.sh. |
1665 | ||
1666 | We've changed the way we handle generated files in the Guile source | |
1667 | repository. As a result, the procedure for building trees obtained | |
1668 | from the nightly FTP snapshots or via CVS has changed: | |
1669 | - You must have appropriate versions of autoconf, automake, and | |
1670 | libtool installed on your system. See README for info on how to | |
1671 | obtain these programs. | |
1672 | - Before configuring the tree, you must first run the script | |
1673 | `autogen.sh' at the top of the source tree. | |
1674 | ||
1675 | The Guile repository used to contain not only source files, written by | |
1676 | humans, but also some generated files, like configure scripts and | |
1677 | Makefile.in files. Even though the contents of these files could be | |
1678 | derived mechanically from other files present, we thought it would | |
1679 | make the tree easier to build if we checked them into CVS. | |
1680 | ||
1681 | However, this approach means that minor differences between | |
1682 | developer's installed tools and habits affected the whole team. | |
1683 | So we have removed the generated files from the repository, and | |
1684 | added the autogen.sh script, which will reconstruct them | |
1685 | appropriately. | |
1686 | ||
1687 | ||
dc914156 GH |
1688 | ** configure now has experimental options to remove support for certain |
1689 | features: | |
52cfc69b | 1690 | |
dc914156 GH |
1691 | --disable-arrays omit array and uniform array support |
1692 | --disable-posix omit posix interfaces | |
1693 | --disable-networking omit networking interfaces | |
1694 | --disable-regex omit regular expression interfaces | |
52cfc69b GH |
1695 | |
1696 | These are likely to become separate modules some day. | |
1697 | ||
9764c29b | 1698 | ** New configure option --enable-debug-freelist |
e1b0d0ac | 1699 | |
38a15cfd GB |
1700 | This enables a debugging version of SCM_NEWCELL(), and also registers |
1701 | an extra primitive, the setter `gc-set-debug-check-freelist!'. | |
1702 | ||
1703 | Configure with the --enable-debug-freelist option to enable | |
1704 | the gc-set-debug-check-freelist! primitive, and then use: | |
1705 | ||
1706 | (gc-set-debug-check-freelist! #t) # turn on checking of the freelist | |
1707 | (gc-set-debug-check-freelist! #f) # turn off checking | |
1708 | ||
1709 | Checking of the freelist forces a traversal of the freelist and | |
1710 | a garbage collection before each allocation of a cell. This can | |
1711 | slow down the interpreter dramatically, so the setter should be used to | |
1712 | turn on this extra processing only when necessary. | |
e1b0d0ac | 1713 | |
9764c29b MD |
1714 | ** New configure option --enable-debug-malloc |
1715 | ||
1716 | Include code for debugging of calls to scm_must_malloc/realloc/free. | |
1717 | ||
1718 | Checks that | |
1719 | ||
1720 | 1. objects freed by scm_must_free has been mallocated by scm_must_malloc | |
1721 | 2. objects reallocated by scm_must_realloc has been allocated by | |
1722 | scm_must_malloc | |
1723 | 3. reallocated objects are reallocated with the same what string | |
1724 | ||
1725 | But, most importantly, it records the number of allocated objects of | |
1726 | each kind. This is useful when searching for memory leaks. | |
1727 | ||
1728 | A Guile compiled with this option provides the primitive | |
1729 | `malloc-stats' which returns an alist with pairs of kind and the | |
1730 | number of objects of that kind. | |
1731 | ||
e415cb06 MD |
1732 | ** All includes are now referenced relative to the root directory |
1733 | ||
1734 | Since some users have had problems with mixups between Guile and | |
1735 | system headers, we have decided to always refer to Guile headers via | |
1736 | their parent directories. This essentially creates a "private name | |
1737 | space" for Guile headers. This means that the compiler only is given | |
1738 | -I options for the root build and root source directory. | |
1739 | ||
341f78c9 MD |
1740 | ** Header files kw.h and genio.h have been removed. |
1741 | ||
1742 | ** The module (ice-9 getopt-gnu-style) has been removed. | |
1743 | ||
e8855f8d MD |
1744 | ** New module (ice-9 documentation) |
1745 | ||
1746 | Implements the interface to documentation strings associated with | |
1747 | objects. | |
1748 | ||
0c0ffe09 KN |
1749 | ** New module (ice-9 time) |
1750 | ||
1751 | Provides a macro `time', which displays execution time of a given form. | |
1752 | ||
cf7a5ee5 KN |
1753 | ** New module (ice-9 history) |
1754 | ||
1755 | Loading this module enables value history in the repl. | |
1756 | ||
0af43c4a | 1757 | * Changes to the stand-alone interpreter |
bd9e24b3 | 1758 | |
67ef2dca MD |
1759 | ** New command line option --debug |
1760 | ||
1761 | Start Guile with debugging evaluator and backtraces enabled. | |
1762 | ||
1763 | This is useful when debugging your .guile init file or scripts. | |
1764 | ||
aa4bb95d MD |
1765 | ** New help facility |
1766 | ||
341f78c9 MD |
1767 | Usage: (help NAME) gives documentation about objects named NAME (a symbol) |
1768 | (help REGEXP) ditto for objects with names matching REGEXP (a string) | |
58e5b910 | 1769 | (help 'NAME) gives documentation for NAME, even if it is not an object |
341f78c9 | 1770 | (help ,EXPR) gives documentation for object returned by EXPR |
6c0201ad | 1771 | (help (my module)) gives module commentary for `(my module)' |
341f78c9 MD |
1772 | (help) gives this text |
1773 | ||
1774 | `help' searches among bindings exported from loaded modules, while | |
1775 | `apropos' searches among bindings visible from the "current" module. | |
1776 | ||
1777 | Examples: (help help) | |
1778 | (help cons) | |
1779 | (help "output-string") | |
aa4bb95d | 1780 | |
e8855f8d MD |
1781 | ** `help' and `apropos' now prints full module names |
1782 | ||
0af43c4a | 1783 | ** Dynamic linking now uses libltdl from the libtool package. |
bd9e24b3 | 1784 | |
0af43c4a MD |
1785 | The old system dependent code for doing dynamic linking has been |
1786 | replaced with calls to the libltdl functions which do all the hairy | |
1787 | details for us. | |
bd9e24b3 | 1788 | |
0af43c4a MD |
1789 | The major improvement is that you can now directly pass libtool |
1790 | library names like "libfoo.la" to `dynamic-link' and `dynamic-link' | |
1791 | will be able to do the best shared library job you can get, via | |
1792 | libltdl. | |
bd9e24b3 | 1793 | |
0af43c4a MD |
1794 | The way dynamic libraries are found has changed and is not really |
1795 | portable across platforms, probably. It is therefore recommended to | |
1796 | use absolute filenames when possible. | |
1797 | ||
1798 | If you pass a filename without an extension to `dynamic-link', it will | |
1799 | try a few appropriate ones. Thus, the most platform ignorant way is | |
1800 | to specify a name like "libfoo", without any directories and | |
1801 | extensions. | |
0573ddae | 1802 | |
91163914 MD |
1803 | ** Guile COOP threads are now compatible with LinuxThreads |
1804 | ||
1805 | Previously, COOP threading wasn't possible in applications linked with | |
1806 | Linux POSIX threads due to their use of the stack pointer to find the | |
1807 | thread context. This has now been fixed with a workaround which uses | |
1808 | the pthreads to allocate the stack. | |
1809 | ||
6c0201ad | 1810 | ** New primitives: `pkgdata-dir', `site-dir', `library-dir' |
62b82274 | 1811 | |
9770d235 MD |
1812 | ** Positions of erring expression in scripts |
1813 | ||
1814 | With version 1.3.4, the location of the erring expression in Guile | |
1815 | scipts is no longer automatically reported. (This should have been | |
1816 | documented before the 1.3.4 release.) | |
1817 | ||
1818 | You can get this information by enabling recording of positions of | |
1819 | source expressions and running the debugging evaluator. Put this at | |
1820 | the top of your script (or in your "site" file): | |
1821 | ||
1822 | (read-enable 'positions) | |
1823 | (debug-enable 'debug) | |
1824 | ||
0573ddae MD |
1825 | ** Backtraces in scripts |
1826 | ||
1827 | It is now possible to get backtraces in scripts. | |
1828 | ||
1829 | Put | |
1830 | ||
1831 | (debug-enable 'debug 'backtrace) | |
1832 | ||
1833 | at the top of the script. | |
1834 | ||
1835 | (The first options enables the debugging evaluator. | |
1836 | The second enables backtraces.) | |
1837 | ||
e8855f8d MD |
1838 | ** Part of module system symbol lookup now implemented in C |
1839 | ||
1840 | The eval closure of most modules is now implemented in C. Since this | |
1841 | was one of the bottlenecks for loading speed, Guile now loads code | |
1842 | substantially faster than before. | |
1843 | ||
f25f761d GH |
1844 | ** Attempting to get the value of an unbound variable now produces |
1845 | an exception with a key of 'unbound-variable instead of 'misc-error. | |
1846 | ||
1a35eadc GH |
1847 | ** The initial default output port is now unbuffered if it's using a |
1848 | tty device. Previously in this situation it was line-buffered. | |
1849 | ||
820920e6 MD |
1850 | ** New hook: after-gc-hook |
1851 | ||
1852 | after-gc-hook takes over the role of gc-thunk. This hook is run at | |
1853 | the first SCM_TICK after a GC. (Thus, the code is run at the same | |
1854 | point during evaluation as signal handlers.) | |
1855 | ||
1856 | Note that this hook should be used only for diagnostic and debugging | |
1857 | purposes. It is not certain that it will continue to be well-defined | |
1858 | when this hook is run in the future. | |
1859 | ||
1860 | C programmers: Note the new C level hooks scm_before_gc_c_hook, | |
1861 | scm_before_sweep_c_hook, scm_after_gc_c_hook. | |
1862 | ||
b5074b23 MD |
1863 | ** Improvements to garbage collector |
1864 | ||
1865 | Guile 1.4 has a new policy for triggering heap allocation and | |
1866 | determining the sizes of heap segments. It fixes a number of problems | |
1867 | in the old GC. | |
1868 | ||
1869 | 1. The new policy can handle two separate pools of cells | |
1870 | (2-word/4-word) better. (The old policy would run wild, allocating | |
1871 | more and more memory for certain programs.) | |
1872 | ||
1873 | 2. The old code would sometimes allocate far too much heap so that the | |
1874 | Guile process became gigantic. The new code avoids this. | |
1875 | ||
1876 | 3. The old code would sometimes allocate too little so that few cells | |
1877 | were freed at GC so that, in turn, too much time was spent in GC. | |
1878 | ||
1879 | 4. The old code would often trigger heap allocation several times in a | |
1880 | row. (The new scheme predicts how large the segments needs to be | |
1881 | in order not to need further allocation.) | |
1882 | ||
e8855f8d MD |
1883 | All in all, the new GC policy will make larger applications more |
1884 | efficient. | |
1885 | ||
b5074b23 MD |
1886 | The new GC scheme also is prepared for POSIX threading. Threads can |
1887 | allocate private pools of cells ("clusters") with just a single | |
1888 | function call. Allocation of single cells from such a cluster can | |
1889 | then proceed without any need of inter-thread synchronization. | |
1890 | ||
1891 | ** New environment variables controlling GC parameters | |
1892 | ||
1893 | GUILE_MAX_SEGMENT_SIZE Maximal segment size | |
1894 | (default = 2097000) | |
1895 | ||
1896 | Allocation of 2-word cell heaps: | |
1897 | ||
1898 | GUILE_INIT_SEGMENT_SIZE_1 Size of initial heap segment in bytes | |
1899 | (default = 360000) | |
1900 | ||
1901 | GUILE_MIN_YIELD_1 Minimum number of freed cells at each | |
1902 | GC in percent of total heap size | |
1903 | (default = 40) | |
1904 | ||
1905 | Allocation of 4-word cell heaps | |
1906 | (used for real numbers and misc other objects): | |
1907 | ||
1908 | GUILE_INIT_SEGMENT_SIZE_2, GUILE_MIN_YIELD_2 | |
1909 | ||
1910 | (See entry "Way for application to customize GC parameters" under | |
1911 | section "Changes to the scm_ interface" below.) | |
1912 | ||
67ef2dca MD |
1913 | ** Guile now implements reals using 4-word cells |
1914 | ||
1915 | This speeds up computation with reals. (They were earlier allocated | |
1916 | with `malloc'.) There is still some room for optimizations, however. | |
1917 | ||
1918 | ** Some further steps toward POSIX thread support have been taken | |
1919 | ||
1920 | *** Guile's critical sections (SCM_DEFER/ALLOW_INTS) | |
1921 | don't have much effect any longer, and many of them will be removed in | |
1922 | next release. | |
1923 | ||
1924 | *** Signals | |
1925 | are only handled at the top of the evaluator loop, immediately after | |
1926 | I/O, and in scm_equalp. | |
1927 | ||
1928 | *** The GC can allocate thread private pools of pairs. | |
1929 | ||
0af43c4a MD |
1930 | * Changes to Scheme functions and syntax |
1931 | ||
a0128ebe | 1932 | ** close-input-port and close-output-port are now R5RS |
7c1e0b12 | 1933 | |
a0128ebe | 1934 | These procedures have been turned into primitives and have R5RS behaviour. |
7c1e0b12 | 1935 | |
0af43c4a MD |
1936 | ** New procedure: simple-format PORT MESSAGE ARG1 ... |
1937 | ||
1938 | (ice-9 boot) makes `format' an alias for `simple-format' until possibly | |
1939 | extended by the more sophisticated version in (ice-9 format) | |
1940 | ||
1941 | (simple-format port message . args) | |
1942 | Write MESSAGE to DESTINATION, defaulting to `current-output-port'. | |
1943 | MESSAGE can contain ~A (was %s) and ~S (was %S) escapes. When printed, | |
1944 | the escapes are replaced with corresponding members of ARGS: | |
1945 | ~A formats using `display' and ~S formats using `write'. | |
1946 | If DESTINATION is #t, then use the `current-output-port', | |
1947 | if DESTINATION is #f, then return a string containing the formatted text. | |
1948 | Does not add a trailing newline." | |
1949 | ||
1950 | ** string-ref: the second argument is no longer optional. | |
1951 | ||
1952 | ** string, list->string: no longer accept strings in their arguments, | |
1953 | only characters, for compatibility with R5RS. | |
1954 | ||
1955 | ** New procedure: port-closed? PORT | |
1956 | Returns #t if PORT is closed or #f if it is open. | |
1957 | ||
0a9e521f MD |
1958 | ** Deprecated: list* |
1959 | ||
1960 | The list* functionality is now provided by cons* (SRFI-1 compliant) | |
1961 | ||
b5074b23 MD |
1962 | ** New procedure: cons* ARG1 ARG2 ... ARGn |
1963 | ||
1964 | Like `list', but the last arg provides the tail of the constructed list, | |
1965 | returning (cons ARG1 (cons ARG2 (cons ... ARGn))). | |
1966 | ||
1967 | Requires at least one argument. If given one argument, that argument | |
1968 | is returned as result. | |
1969 | ||
1970 | This function is called `list*' in some other Schemes and in Common LISP. | |
1971 | ||
341f78c9 MD |
1972 | ** Removed deprecated: serial-map, serial-array-copy!, serial-array-map! |
1973 | ||
e8855f8d MD |
1974 | ** New procedure: object-documentation OBJECT |
1975 | ||
1976 | Returns the documentation string associated with OBJECT. The | |
1977 | procedure uses a caching mechanism so that subsequent lookups are | |
1978 | faster. | |
1979 | ||
1980 | Exported by (ice-9 documentation). | |
1981 | ||
1982 | ** module-name now returns full names of modules | |
1983 | ||
1984 | Previously, only the last part of the name was returned (`session' for | |
1985 | `(ice-9 session)'). Ex: `(ice-9 session)'. | |
1986 | ||
894a712b DH |
1987 | * Changes to the gh_ interface |
1988 | ||
1989 | ** Deprecated: gh_int2scmb | |
1990 | ||
1991 | Use gh_bool2scm instead. | |
1992 | ||
a2349a28 GH |
1993 | * Changes to the scm_ interface |
1994 | ||
810e1aec MD |
1995 | ** Guile primitives now carry docstrings! |
1996 | ||
1997 | Thanks to Greg Badros! | |
1998 | ||
0a9e521f | 1999 | ** Guile primitives are defined in a new way: SCM_DEFINE/SCM_DEFINE1/SCM_PROC |
0af43c4a | 2000 | |
0a9e521f MD |
2001 | Now Guile primitives are defined using the SCM_DEFINE/SCM_DEFINE1/SCM_PROC |
2002 | macros and must contain a docstring that is extracted into foo.doc using a new | |
0af43c4a MD |
2003 | guile-doc-snarf script (that uses guile-doc-snarf.awk). |
2004 | ||
0a9e521f MD |
2005 | However, a major overhaul of these macros is scheduled for the next release of |
2006 | guile. | |
2007 | ||
0af43c4a MD |
2008 | ** Guile primitives use a new technique for validation of arguments |
2009 | ||
2010 | SCM_VALIDATE_* macros are defined to ease the redundancy and improve | |
2011 | the readability of argument checking. | |
2012 | ||
2013 | ** All (nearly?) K&R prototypes for functions replaced with ANSI C equivalents. | |
2014 | ||
894a712b | 2015 | ** New macros: SCM_PACK, SCM_UNPACK |
f8a72ca4 MD |
2016 | |
2017 | Compose/decompose an SCM value. | |
2018 | ||
894a712b DH |
2019 | The SCM type is now treated as an abstract data type and may be defined as a |
2020 | long, a void* or as a struct, depending on the architecture and compile time | |
2021 | options. This makes it easier to find several types of bugs, for example when | |
2022 | SCM values are treated as integers without conversion. Values of the SCM type | |
2023 | should be treated as "atomic" values. These macros are used when | |
f8a72ca4 MD |
2024 | composing/decomposing an SCM value, either because you want to access |
2025 | individual bits, or because you want to treat it as an integer value. | |
2026 | ||
2027 | E.g., in order to set bit 7 in an SCM value x, use the expression | |
2028 | ||
2029 | SCM_PACK (SCM_UNPACK (x) | 0x80) | |
2030 | ||
e11f8b42 DH |
2031 | ** The name property of hooks is deprecated. |
2032 | Thus, the use of SCM_HOOK_NAME and scm_make_hook_with_name is deprecated. | |
2033 | ||
2034 | You can emulate this feature by using object properties. | |
2035 | ||
6c0201ad | 2036 | ** Deprecated macros: SCM_INPORTP, SCM_OUTPORTP, SCM_CRDY, SCM_ICHRP, |
894a712b DH |
2037 | SCM_ICHR, SCM_MAKICHR, SCM_SETJMPBUF, SCM_NSTRINGP, SCM_NRWSTRINGP, |
2038 | SCM_NVECTORP | |
f8a72ca4 | 2039 | |
894a712b | 2040 | These macros will be removed in a future release of Guile. |
7c1e0b12 | 2041 | |
6c0201ad | 2042 | ** The following types, functions and macros from numbers.h are deprecated: |
0a9e521f MD |
2043 | scm_dblproc, SCM_UNEGFIXABLE, SCM_FLOBUFLEN, SCM_INEXP, SCM_CPLXP, SCM_REAL, |
2044 | SCM_IMAG, SCM_REALPART, scm_makdbl, SCM_SINGP, SCM_NUM2DBL, SCM_NO_BIGDIG | |
2045 | ||
2046 | Further, it is recommended not to rely on implementation details for guile's | |
2047 | current implementation of bignums. It is planned to replace this | |
2048 | implementation with gmp in the future. | |
2049 | ||
a2349a28 GH |
2050 | ** Port internals: the rw_random variable in the scm_port structure |
2051 | must be set to non-zero in any random access port. In recent Guile | |
2052 | releases it was only set for bidirectional random-access ports. | |
2053 | ||
7dcb364d GH |
2054 | ** Port internals: the seek ptob procedure is now responsible for |
2055 | resetting the buffers if required. The change was made so that in the | |
2056 | special case of reading the current position (i.e., seek p 0 SEEK_CUR) | |
2057 | the fport and strport ptobs can avoid resetting the buffers, | |
2058 | in particular to avoid discarding unread chars. An existing port | |
2059 | type can be fixed by adding something like the following to the | |
2060 | beginning of the ptob seek procedure: | |
2061 | ||
2062 | if (pt->rw_active == SCM_PORT_READ) | |
2063 | scm_end_input (object); | |
2064 | else if (pt->rw_active == SCM_PORT_WRITE) | |
2065 | ptob->flush (object); | |
2066 | ||
2067 | although to actually avoid resetting the buffers and discard unread | |
2068 | chars requires further hacking that depends on the characteristics | |
2069 | of the ptob. | |
2070 | ||
894a712b DH |
2071 | ** Deprecated functions: scm_fseek, scm_tag |
2072 | ||
2073 | These functions are no longer used and will be removed in a future version. | |
2074 | ||
f25f761d GH |
2075 | ** The scm_sysmissing procedure is no longer used in libguile. |
2076 | Unless it turns out to be unexpectedly useful to somebody, it will be | |
2077 | removed in a future version. | |
2078 | ||
0af43c4a MD |
2079 | ** The format of error message strings has changed |
2080 | ||
2081 | The two C procedures: scm_display_error and scm_error, as well as the | |
2082 | primitive `scm-error', now use scm_simple_format to do their work. | |
2083 | This means that the message strings of all code must be updated to use | |
2084 | ~A where %s was used before, and ~S where %S was used before. | |
2085 | ||
2086 | During the period when there still are a lot of old Guiles out there, | |
2087 | you might want to support both old and new versions of Guile. | |
2088 | ||
2089 | There are basically two methods to achieve this. Both methods use | |
2090 | autoconf. Put | |
2091 | ||
2092 | AC_CHECK_FUNCS(scm_simple_format) | |
2093 | ||
2094 | in your configure.in. | |
2095 | ||
2096 | Method 1: Use the string concatenation features of ANSI C's | |
2097 | preprocessor. | |
2098 | ||
2099 | In C: | |
2100 | ||
2101 | #ifdef HAVE_SCM_SIMPLE_FORMAT | |
2102 | #define FMT_S "~S" | |
2103 | #else | |
2104 | #define FMT_S "%S" | |
2105 | #endif | |
2106 | ||
2107 | Then represent each of your error messages using a preprocessor macro: | |
2108 | ||
2109 | #define E_SPIDER_ERROR "There's a spider in your " ## FMT_S ## "!!!" | |
2110 | ||
2111 | In Scheme: | |
2112 | ||
2113 | (define fmt-s (if (defined? 'simple-format) "~S" "%S")) | |
2114 | (define make-message string-append) | |
2115 | ||
2116 | (define e-spider-error (make-message "There's a spider in your " fmt-s "!!!")) | |
2117 | ||
2118 | Method 2: Use the oldfmt function found in doc/oldfmt.c. | |
2119 | ||
2120 | In C: | |
2121 | ||
2122 | scm_misc_error ("picnic", scm_c_oldfmt0 ("There's a spider in your ~S!!!"), | |
2123 | ...); | |
2124 | ||
2125 | In Scheme: | |
2126 | ||
2127 | (scm-error 'misc-error "picnic" (oldfmt "There's a spider in your ~S!!!") | |
2128 | ...) | |
2129 | ||
2130 | ||
f3b5e185 MD |
2131 | ** Deprecated: coop_mutex_init, coop_condition_variable_init |
2132 | ||
2133 | Don't use the functions coop_mutex_init and | |
2134 | coop_condition_variable_init. They will change. | |
2135 | ||
2136 | Use scm_mutex_init and scm_cond_init instead. | |
2137 | ||
f3b5e185 MD |
2138 | ** New function: int scm_cond_timedwait (scm_cond_t *COND, scm_mutex_t *MUTEX, const struct timespec *ABSTIME) |
2139 | `scm_cond_timedwait' atomically unlocks MUTEX and waits on | |
2140 | COND, as `scm_cond_wait' does, but it also bounds the duration | |
2141 | of the wait. If COND has not been signaled before time ABSTIME, | |
2142 | the mutex MUTEX is re-acquired and `scm_cond_timedwait' | |
2143 | returns the error code `ETIMEDOUT'. | |
2144 | ||
2145 | The ABSTIME parameter specifies an absolute time, with the same | |
2146 | origin as `time' and `gettimeofday': an ABSTIME of 0 corresponds | |
2147 | to 00:00:00 GMT, January 1, 1970. | |
2148 | ||
2149 | ** New function: scm_cond_broadcast (scm_cond_t *COND) | |
2150 | `scm_cond_broadcast' restarts all the threads that are waiting | |
2151 | on the condition variable COND. Nothing happens if no threads are | |
2152 | waiting on COND. | |
2153 | ||
2154 | ** New function: scm_key_create (scm_key_t *KEY, void (*destr_function) (void *)) | |
2155 | `scm_key_create' allocates a new TSD key. The key is stored in | |
2156 | the location pointed to by KEY. There is no limit on the number | |
2157 | of keys allocated at a given time. The value initially associated | |
2158 | with the returned key is `NULL' in all currently executing threads. | |
2159 | ||
2160 | The DESTR_FUNCTION argument, if not `NULL', specifies a destructor | |
2161 | function associated with the key. When a thread terminates, | |
2162 | DESTR_FUNCTION is called on the value associated with the key in | |
2163 | that thread. The DESTR_FUNCTION is not called if a key is deleted | |
2164 | with `scm_key_delete' or a value is changed with | |
2165 | `scm_setspecific'. The order in which destructor functions are | |
2166 | called at thread termination time is unspecified. | |
2167 | ||
2168 | Destructors are not yet implemented. | |
2169 | ||
2170 | ** New function: scm_setspecific (scm_key_t KEY, const void *POINTER) | |
2171 | `scm_setspecific' changes the value associated with KEY in the | |
2172 | calling thread, storing the given POINTER instead. | |
2173 | ||
2174 | ** New function: scm_getspecific (scm_key_t KEY) | |
2175 | `scm_getspecific' returns the value currently associated with | |
2176 | KEY in the calling thread. | |
2177 | ||
2178 | ** New function: scm_key_delete (scm_key_t KEY) | |
2179 | `scm_key_delete' deallocates a TSD key. It does not check | |
2180 | whether non-`NULL' values are associated with that key in the | |
2181 | currently executing threads, nor call the destructor function | |
2182 | associated with the key. | |
2183 | ||
820920e6 MD |
2184 | ** New function: scm_c_hook_init (scm_c_hook_t *HOOK, void *HOOK_DATA, scm_c_hook_type_t TYPE) |
2185 | ||
2186 | Initialize a C level hook HOOK with associated HOOK_DATA and type | |
2187 | TYPE. (See scm_c_hook_run ().) | |
2188 | ||
2189 | ** New function: scm_c_hook_add (scm_c_hook_t *HOOK, scm_c_hook_function_t FUNC, void *FUNC_DATA, int APPENDP) | |
2190 | ||
2191 | Add hook function FUNC with associated FUNC_DATA to HOOK. If APPENDP | |
2192 | is true, add it last, otherwise first. The same FUNC can be added | |
2193 | multiple times if FUNC_DATA differ and vice versa. | |
2194 | ||
2195 | ** New function: scm_c_hook_remove (scm_c_hook_t *HOOK, scm_c_hook_function_t FUNC, void *FUNC_DATA) | |
2196 | ||
2197 | Remove hook function FUNC with associated FUNC_DATA from HOOK. A | |
2198 | function is only removed if both FUNC and FUNC_DATA matches. | |
2199 | ||
2200 | ** New function: void *scm_c_hook_run (scm_c_hook_t *HOOK, void *DATA) | |
2201 | ||
2202 | Run hook HOOK passing DATA to the hook functions. | |
2203 | ||
2204 | If TYPE is SCM_C_HOOK_NORMAL, all hook functions are run. The value | |
2205 | returned is undefined. | |
2206 | ||
2207 | If TYPE is SCM_C_HOOK_OR, hook functions are run until a function | |
2208 | returns a non-NULL value. This value is returned as the result of | |
2209 | scm_c_hook_run. If all functions return NULL, NULL is returned. | |
2210 | ||
2211 | If TYPE is SCM_C_HOOK_AND, hook functions are run until a function | |
2212 | returns a NULL value, and NULL is returned. If all functions returns | |
2213 | a non-NULL value, the last value is returned. | |
2214 | ||
2215 | ** New C level GC hooks | |
2216 | ||
2217 | Five new C level hooks has been added to the garbage collector. | |
2218 | ||
2219 | scm_before_gc_c_hook | |
2220 | scm_after_gc_c_hook | |
2221 | ||
2222 | are run before locking and after unlocking the heap. The system is | |
2223 | thus in a mode where evaluation can take place. (Except that | |
2224 | scm_before_gc_c_hook must not allocate new cells.) | |
2225 | ||
2226 | scm_before_mark_c_hook | |
2227 | scm_before_sweep_c_hook | |
2228 | scm_after_sweep_c_hook | |
2229 | ||
2230 | are run when the heap is locked. These are intended for extension of | |
2231 | the GC in a modular fashion. Examples are the weaks and guardians | |
2232 | modules. | |
2233 | ||
b5074b23 MD |
2234 | ** Way for application to customize GC parameters |
2235 | ||
2236 | The application can set up other default values for the GC heap | |
2237 | allocation parameters | |
2238 | ||
2239 | GUILE_INIT_HEAP_SIZE_1, GUILE_MIN_YIELD_1, | |
2240 | GUILE_INIT_HEAP_SIZE_2, GUILE_MIN_YIELD_2, | |
2241 | GUILE_MAX_SEGMENT_SIZE, | |
2242 | ||
2243 | by setting | |
2244 | ||
2245 | scm_default_init_heap_size_1, scm_default_min_yield_1, | |
2246 | scm_default_init_heap_size_2, scm_default_min_yield_2, | |
2247 | scm_default_max_segment_size | |
2248 | ||
2249 | respectively before callong scm_boot_guile. | |
2250 | ||
2251 | (See entry "New environment variables ..." in section | |
2252 | "Changes to the stand-alone interpreter" above.) | |
2253 | ||
9704841c MD |
2254 | ** scm_protect_object/scm_unprotect_object now nest |
2255 | ||
67ef2dca MD |
2256 | This means that you can call scm_protect_object multiple times on an |
2257 | object and count on the object being protected until | |
2258 | scm_unprotect_object has been call the same number of times. | |
2259 | ||
2260 | The functions also have better time complexity. | |
2261 | ||
2262 | Still, it is usually possible to structure the application in a way | |
2263 | that you don't need to use these functions. For example, if you use a | |
2264 | protected standard Guile list to keep track of live objects rather | |
2265 | than some custom data type, objects will die a natural death when they | |
2266 | are no longer needed. | |
2267 | ||
0a9e521f MD |
2268 | ** Deprecated type tags: scm_tc16_flo, scm_tc_flo, scm_tc_dblr, scm_tc_dblc |
2269 | ||
2270 | Guile does not provide the float representation for inexact real numbers any | |
2271 | more. Now, only doubles are used to represent inexact real numbers. Further, | |
2272 | the tag names scm_tc_dblr and scm_tc_dblc have been changed to scm_tc16_real | |
2273 | and scm_tc16_complex, respectively. | |
2274 | ||
341f78c9 MD |
2275 | ** Removed deprecated type scm_smobfuns |
2276 | ||
2277 | ** Removed deprecated function scm_newsmob | |
2278 | ||
b5074b23 MD |
2279 | ** Warning: scm_make_smob_type_mfpe might become deprecated in a future release |
2280 | ||
2281 | There is an ongoing discussion among the developers whether to | |
2282 | deprecate `scm_make_smob_type_mfpe' or not. Please use the current | |
2283 | standard interface (scm_make_smob_type, scm_set_smob_XXX) in new code | |
2284 | until this issue has been settled. | |
2285 | ||
341f78c9 MD |
2286 | ** Removed deprecated type tag scm_tc16_kw |
2287 | ||
2728d7f4 MD |
2288 | ** Added type tag scm_tc16_keyword |
2289 | ||
2290 | (This was introduced already in release 1.3.4 but was not documented | |
2291 | until now.) | |
2292 | ||
67ef2dca MD |
2293 | ** gdb_print now prints "*** Guile not initialized ***" until Guile initialized |
2294 | ||
f25f761d GH |
2295 | * Changes to system call interfaces: |
2296 | ||
28d77376 GH |
2297 | ** The "select" procedure now tests port buffers for the ability to |
2298 | provide input or accept output. Previously only the underlying file | |
2299 | descriptors were checked. | |
2300 | ||
bd9e24b3 GH |
2301 | ** New variable PIPE_BUF: the maximum number of bytes that can be |
2302 | atomically written to a pipe. | |
2303 | ||
f25f761d GH |
2304 | ** If a facility is not available on the system when Guile is |
2305 | compiled, the corresponding primitive procedure will not be defined. | |
2306 | Previously it would have been defined but would throw a system-error | |
2307 | exception if called. Exception handlers which catch this case may | |
2308 | need minor modification: an error will be thrown with key | |
2309 | 'unbound-variable instead of 'system-error. Alternatively it's | |
2310 | now possible to use `defined?' to check whether the facility is | |
2311 | available. | |
2312 | ||
38c1d3c4 | 2313 | ** Procedures which depend on the timezone should now give the correct |
6c0201ad | 2314 | result on systems which cache the TZ environment variable, even if TZ |
38c1d3c4 GH |
2315 | is changed without calling tzset. |
2316 | ||
5c11cc9d GH |
2317 | * Changes to the networking interfaces: |
2318 | ||
2319 | ** New functions: htons, ntohs, htonl, ntohl: for converting short and | |
2320 | long integers between network and host format. For now, it's not | |
2321 | particularly convenient to do this kind of thing, but consider: | |
2322 | ||
2323 | (define write-network-long | |
2324 | (lambda (value port) | |
2325 | (let ((v (make-uniform-vector 1 1 0))) | |
2326 | (uniform-vector-set! v 0 (htonl value)) | |
2327 | (uniform-vector-write v port)))) | |
2328 | ||
2329 | (define read-network-long | |
2330 | (lambda (port) | |
2331 | (let ((v (make-uniform-vector 1 1 0))) | |
2332 | (uniform-vector-read! v port) | |
2333 | (ntohl (uniform-vector-ref v 0))))) | |
2334 | ||
2335 | ** If inet-aton fails, it now throws an error with key 'misc-error | |
2336 | instead of 'system-error, since errno is not relevant. | |
2337 | ||
2338 | ** Certain gethostbyname/gethostbyaddr failures now throw errors with | |
2339 | specific keys instead of 'system-error. The latter is inappropriate | |
2340 | since errno will not have been set. The keys are: | |
afe5177e | 2341 | 'host-not-found, 'try-again, 'no-recovery and 'no-data. |
5c11cc9d GH |
2342 | |
2343 | ** sethostent, setnetent, setprotoent, setservent: now take an | |
2344 | optional argument STAYOPEN, which specifies whether the database | |
2345 | remains open after a database entry is accessed randomly (e.g., using | |
2346 | gethostbyname for the hosts database.) The default is #f. Previously | |
2347 | #t was always used. | |
2348 | ||
cc36e791 | 2349 | \f |
43fa9a05 JB |
2350 | Changes since Guile 1.3.2: |
2351 | ||
0fdcbcaa MD |
2352 | * Changes to the stand-alone interpreter |
2353 | ||
2354 | ** Debugger | |
2355 | ||
2356 | An initial version of the Guile debugger written by Chris Hanson has | |
2357 | been added. The debugger is still under development but is included | |
2358 | in the distribution anyway since it is already quite useful. | |
2359 | ||
2360 | Type | |
2361 | ||
2362 | (debug) | |
2363 | ||
2364 | after an error to enter the debugger. Type `help' inside the debugger | |
2365 | for a description of available commands. | |
2366 | ||
2367 | If you prefer to have stack frames numbered and printed in | |
2368 | anti-chronological order and prefer up in the stack to be down on the | |
2369 | screen as is the case in gdb, you can put | |
2370 | ||
2371 | (debug-enable 'backwards) | |
2372 | ||
2373 | in your .guile startup file. (However, this means that Guile can't | |
2374 | use indentation to indicate stack level.) | |
2375 | ||
2376 | The debugger is autoloaded into Guile at the first use. | |
2377 | ||
2378 | ** Further enhancements to backtraces | |
2379 | ||
2380 | There is a new debug option `width' which controls the maximum width | |
2381 | on the screen of printed stack frames. Fancy printing parameters | |
2382 | ("level" and "length" as in Common LISP) are adaptively adjusted for | |
2383 | each stack frame to give maximum information while still fitting | |
2384 | within the bounds. If the stack frame can't be made to fit by | |
2385 | adjusting parameters, it is simply cut off at the end. This is marked | |
2386 | with a `$'. | |
2387 | ||
2388 | ** Some modules are now only loaded when the repl is started | |
2389 | ||
2390 | The modules (ice-9 debug), (ice-9 session), (ice-9 threads) and (ice-9 | |
2391 | regex) are now loaded into (guile-user) only if the repl has been | |
2392 | started. The effect is that the startup time for scripts has been | |
2393 | reduced to 30% of what it was previously. | |
2394 | ||
2395 | Correctly written scripts load the modules they require at the top of | |
2396 | the file and should not be affected by this change. | |
2397 | ||
ece41168 MD |
2398 | ** Hooks are now represented as smobs |
2399 | ||
6822fe53 MD |
2400 | * Changes to Scheme functions and syntax |
2401 | ||
0ce204b0 MV |
2402 | ** Readline support has changed again. |
2403 | ||
2404 | The old (readline-activator) module is gone. Use (ice-9 readline) | |
2405 | instead, which now contains all readline functionality. So the code | |
2406 | to activate readline is now | |
2407 | ||
2408 | (use-modules (ice-9 readline)) | |
2409 | (activate-readline) | |
2410 | ||
2411 | This should work at any time, including from the guile prompt. | |
2412 | ||
5d195868 JB |
2413 | To avoid confusion about the terms of Guile's license, please only |
2414 | enable readline for your personal use; please don't make it the | |
2415 | default for others. Here is why we make this rather odd-sounding | |
2416 | request: | |
2417 | ||
2418 | Guile is normally licensed under a weakened form of the GNU General | |
2419 | Public License, which allows you to link code with Guile without | |
2420 | placing that code under the GPL. This exception is important to some | |
2421 | people. | |
2422 | ||
2423 | However, since readline is distributed under the GNU General Public | |
2424 | License, when you link Guile with readline, either statically or | |
2425 | dynamically, you effectively change Guile's license to the strict GPL. | |
2426 | Whenever you link any strictly GPL'd code into Guile, uses of Guile | |
2427 | which are normally permitted become forbidden. This is a rather | |
2428 | non-obvious consequence of the licensing terms. | |
2429 | ||
2430 | So, to make sure things remain clear, please let people choose for | |
2431 | themselves whether to link GPL'd libraries like readline with Guile. | |
2432 | ||
25b0654e JB |
2433 | ** regexp-substitute/global has changed slightly, but incompatibly. |
2434 | ||
2435 | If you include a function in the item list, the string of the match | |
2436 | object it receives is the same string passed to | |
2437 | regexp-substitute/global, not some suffix of that string. | |
2438 | Correspondingly, the match's positions are relative to the entire | |
2439 | string, not the suffix. | |
2440 | ||
2441 | If the regexp can match the empty string, the way matches are chosen | |
2442 | from the string has changed. regexp-substitute/global recognizes the | |
2443 | same set of matches that list-matches does; see below. | |
2444 | ||
2445 | ** New function: list-matches REGEXP STRING [FLAGS] | |
2446 | ||
2447 | Return a list of match objects, one for every non-overlapping, maximal | |
2448 | match of REGEXP in STRING. The matches appear in left-to-right order. | |
2449 | list-matches only reports matches of the empty string if there are no | |
2450 | other matches which begin on, end at, or include the empty match's | |
2451 | position. | |
2452 | ||
2453 | If present, FLAGS is passed as the FLAGS argument to regexp-exec. | |
2454 | ||
2455 | ** New function: fold-matches REGEXP STRING INIT PROC [FLAGS] | |
2456 | ||
2457 | For each match of REGEXP in STRING, apply PROC to the match object, | |
2458 | and the last value PROC returned, or INIT for the first call. Return | |
2459 | the last value returned by PROC. We apply PROC to the matches as they | |
2460 | appear from left to right. | |
2461 | ||
2462 | This function recognizes matches according to the same criteria as | |
2463 | list-matches. | |
2464 | ||
2465 | Thus, you could define list-matches like this: | |
2466 | ||
2467 | (define (list-matches regexp string . flags) | |
2468 | (reverse! (apply fold-matches regexp string '() cons flags))) | |
2469 | ||
2470 | If present, FLAGS is passed as the FLAGS argument to regexp-exec. | |
2471 | ||
bc848f7f MD |
2472 | ** Hooks |
2473 | ||
2474 | *** New function: hook? OBJ | |
2475 | ||
2476 | Return #t if OBJ is a hook, otherwise #f. | |
2477 | ||
ece41168 MD |
2478 | *** New function: make-hook-with-name NAME [ARITY] |
2479 | ||
2480 | Return a hook with name NAME and arity ARITY. The default value for | |
2481 | ARITY is 0. The only effect of NAME is that it will appear when the | |
2482 | hook object is printed to ease debugging. | |
2483 | ||
bc848f7f MD |
2484 | *** New function: hook-empty? HOOK |
2485 | ||
2486 | Return #t if HOOK doesn't contain any procedures, otherwise #f. | |
2487 | ||
2488 | *** New function: hook->list HOOK | |
2489 | ||
2490 | Return a list of the procedures that are called when run-hook is | |
2491 | applied to HOOK. | |
2492 | ||
b074884f JB |
2493 | ** `map' signals an error if its argument lists are not all the same length. |
2494 | ||
2495 | This is the behavior required by R5RS, so this change is really a bug | |
2496 | fix. But it seems to affect a lot of people's code, so we're | |
2497 | mentioning it here anyway. | |
2498 | ||
6822fe53 MD |
2499 | ** Print-state handling has been made more transparent |
2500 | ||
2501 | Under certain circumstances, ports are represented as a port with an | |
2502 | associated print state. Earlier, this pair was represented as a pair | |
2503 | (see "Some magic has been added to the printer" below). It is now | |
2504 | indistinguishable (almost; see `get-print-state') from a port on the | |
2505 | user level. | |
2506 | ||
2507 | *** New function: port-with-print-state OUTPUT-PORT PRINT-STATE | |
2508 | ||
2509 | Return a new port with the associated print state PRINT-STATE. | |
2510 | ||
2511 | *** New function: get-print-state OUTPUT-PORT | |
2512 | ||
2513 | Return the print state associated with this port if it exists, | |
2514 | otherwise return #f. | |
2515 | ||
340a8770 | 2516 | *** New function: directory-stream? OBJECT |
77242ff9 | 2517 | |
340a8770 | 2518 | Returns true iff OBJECT is a directory stream --- the sort of object |
77242ff9 GH |
2519 | returned by `opendir'. |
2520 | ||
0fdcbcaa MD |
2521 | ** New function: using-readline? |
2522 | ||
2523 | Return #t if readline is in use in the current repl. | |
2524 | ||
26405bc1 MD |
2525 | ** structs will be removed in 1.4 |
2526 | ||
2527 | Structs will be replaced in Guile 1.4. We will merge GOOPS into Guile | |
2528 | and use GOOPS objects as the fundamental record type. | |
2529 | ||
49199eaa MD |
2530 | * Changes to the scm_ interface |
2531 | ||
26405bc1 MD |
2532 | ** structs will be removed in 1.4 |
2533 | ||
2534 | The entire current struct interface (struct.c, struct.h) will be | |
2535 | replaced in Guile 1.4. We will merge GOOPS into libguile and use | |
2536 | GOOPS objects as the fundamental record type. | |
2537 | ||
49199eaa MD |
2538 | ** The internal representation of subr's has changed |
2539 | ||
2540 | Instead of giving a hint to the subr name, the CAR field of the subr | |
2541 | now contains an index to a subr entry in scm_subr_table. | |
2542 | ||
2543 | *** New variable: scm_subr_table | |
2544 | ||
2545 | An array of subr entries. A subr entry contains the name, properties | |
2546 | and documentation associated with the subr. The properties and | |
2547 | documentation slots are not yet used. | |
2548 | ||
2549 | ** A new scheme for "forwarding" calls to a builtin to a generic function | |
2550 | ||
2551 | It is now possible to extend the functionality of some Guile | |
2552 | primitives by letting them defer a call to a GOOPS generic function on | |
240ed66f | 2553 | argument mismatch. This means that there is no loss of efficiency in |
daf516d6 | 2554 | normal evaluation. |
49199eaa MD |
2555 | |
2556 | Example: | |
2557 | ||
daf516d6 | 2558 | (use-modules (oop goops)) ; Must be GOOPS version 0.2. |
49199eaa MD |
2559 | (define-method + ((x <string>) (y <string>)) |
2560 | (string-append x y)) | |
2561 | ||
86a4d62e MD |
2562 | + will still be as efficient as usual in numerical calculations, but |
2563 | can also be used for concatenating strings. | |
49199eaa | 2564 | |
86a4d62e | 2565 | Who will be the first one to extend Guile's numerical tower to |
daf516d6 MD |
2566 | rationals? :) [OK, there a few other things to fix before this can |
2567 | be made in a clean way.] | |
49199eaa MD |
2568 | |
2569 | *** New snarf macros for defining primitives: SCM_GPROC, SCM_GPROC1 | |
2570 | ||
2571 | New macro: SCM_GPROC (CNAME, SNAME, REQ, OPT, VAR, CFUNC, GENERIC) | |
2572 | ||
2573 | New macro: SCM_GPROC1 (CNAME, SNAME, TYPE, CFUNC, GENERIC) | |
2574 | ||
d02cafe7 | 2575 | These do the same job as SCM_PROC and SCM_PROC1, but they also define |
49199eaa MD |
2576 | a variable GENERIC which can be used by the dispatch macros below. |
2577 | ||
2578 | [This is experimental code which may change soon.] | |
2579 | ||
2580 | *** New macros for forwarding control to a generic on arg type error | |
2581 | ||
2582 | New macro: SCM_WTA_DISPATCH_1 (GENERIC, ARG1, POS, SUBR) | |
2583 | ||
2584 | New macro: SCM_WTA_DISPATCH_2 (GENERIC, ARG1, ARG2, POS, SUBR) | |
2585 | ||
2586 | These correspond to the scm_wta function call, and have the same | |
2587 | behaviour until the user has called the GOOPS primitive | |
2588 | `enable-primitive-generic!'. After that, these macros will apply the | |
2589 | generic function GENERIC to the argument(s) instead of calling | |
2590 | scm_wta. | |
2591 | ||
2592 | [This is experimental code which may change soon.] | |
2593 | ||
2594 | *** New macros for argument testing with generic dispatch | |
2595 | ||
2596 | New macro: SCM_GASSERT1 (COND, GENERIC, ARG1, POS, SUBR) | |
2597 | ||
2598 | New macro: SCM_GASSERT2 (COND, GENERIC, ARG1, ARG2, POS, SUBR) | |
2599 | ||
2600 | These correspond to the SCM_ASSERT macro, but will defer control to | |
2601 | GENERIC on error after `enable-primitive-generic!' has been called. | |
2602 | ||
2603 | [This is experimental code which may change soon.] | |
2604 | ||
2605 | ** New function: SCM scm_eval_body (SCM body, SCM env) | |
2606 | ||
2607 | Evaluates the body of a special form. | |
2608 | ||
2609 | ** The internal representation of struct's has changed | |
2610 | ||
2611 | Previously, four slots were allocated for the procedure(s) of entities | |
2612 | and operators. The motivation for this representation had to do with | |
2613 | the structure of the evaluator, the wish to support tail-recursive | |
2614 | generic functions, and efficiency. Since the generic function | |
2615 | dispatch mechanism has changed, there is no longer a need for such an | |
2616 | expensive representation, and the representation has been simplified. | |
2617 | ||
2618 | This should not make any difference for most users. | |
2619 | ||
2620 | ** GOOPS support has been cleaned up. | |
2621 | ||
2622 | Some code has been moved from eval.c to objects.c and code in both of | |
2623 | these compilation units has been cleaned up and better structured. | |
2624 | ||
2625 | *** New functions for applying generic functions | |
2626 | ||
2627 | New function: SCM scm_apply_generic (GENERIC, ARGS) | |
2628 | New function: SCM scm_call_generic_0 (GENERIC) | |
2629 | New function: SCM scm_call_generic_1 (GENERIC, ARG1) | |
2630 | New function: SCM scm_call_generic_2 (GENERIC, ARG1, ARG2) | |
2631 | New function: SCM scm_call_generic_3 (GENERIC, ARG1, ARG2, ARG3) | |
2632 | ||
ece41168 MD |
2633 | ** Deprecated function: scm_make_named_hook |
2634 | ||
2635 | It is now replaced by: | |
2636 | ||
2637 | ** New function: SCM scm_create_hook (const char *name, int arity) | |
2638 | ||
2639 | Creates a hook in the same way as make-hook above but also | |
2640 | binds a variable named NAME to it. | |
2641 | ||
2642 | This is the typical way of creating a hook from C code. | |
2643 | ||
2644 | Currently, the variable is created in the "current" module. | |
2645 | This might change when we get the new module system. | |
2646 | ||
2647 | [The behaviour is identical to scm_make_named_hook.] | |
2648 | ||
2649 | ||
43fa9a05 | 2650 | \f |
f3227c7a JB |
2651 | Changes since Guile 1.3: |
2652 | ||
6ca345f3 JB |
2653 | * Changes to mailing lists |
2654 | ||
2655 | ** Some of the Guile mailing lists have moved to sourceware.cygnus.com. | |
2656 | ||
2657 | See the README file to find current addresses for all the Guile | |
2658 | mailing lists. | |
2659 | ||
d77fb593 JB |
2660 | * Changes to the distribution |
2661 | ||
1d335863 JB |
2662 | ** Readline support is no longer included with Guile by default. |
2663 | ||
2664 | Based on the different license terms of Guile and Readline, we | |
2665 | concluded that Guile should not *by default* cause the linking of | |
2666 | Readline into an application program. Readline support is now offered | |
2667 | as a separate module, which is linked into an application only when | |
2668 | you explicitly specify it. | |
2669 | ||
2670 | Although Guile is GNU software, its distribution terms add a special | |
2671 | exception to the usual GNU General Public License (GPL). Guile's | |
2672 | license includes a clause that allows you to link Guile with non-free | |
2673 | programs. We add this exception so as not to put Guile at a | |
2674 | disadvantage vis-a-vis other extensibility packages that support other | |
2675 | languages. | |
2676 | ||
2677 | In contrast, the GNU Readline library is distributed under the GNU | |
2678 | General Public License pure and simple. This means that you may not | |
2679 | link Readline, even dynamically, into an application unless it is | |
2680 | distributed under a free software license that is compatible the GPL. | |
2681 | ||
2682 | Because of this difference in distribution terms, an application that | |
2683 | can use Guile may not be able to use Readline. Now users will be | |
2684 | explicitly offered two independent decisions about the use of these | |
2685 | two packages. | |
d77fb593 | 2686 | |
0e8a8468 MV |
2687 | You can activate the readline support by issuing |
2688 | ||
2689 | (use-modules (readline-activator)) | |
2690 | (activate-readline) | |
2691 | ||
2692 | from your ".guile" file, for example. | |
2693 | ||
e4eae9b1 MD |
2694 | * Changes to the stand-alone interpreter |
2695 | ||
67ad463a MD |
2696 | ** All builtins now print as primitives. |
2697 | Previously builtin procedures not belonging to the fundamental subr | |
2698 | types printed as #<compiled closure #<primitive-procedure gsubr-apply>>. | |
2699 | Now, they print as #<primitive-procedure NAME>. | |
2700 | ||
2701 | ** Backtraces slightly more intelligible. | |
2702 | gsubr-apply and macro transformer application frames no longer appear | |
2703 | in backtraces. | |
2704 | ||
69c6acbb JB |
2705 | * Changes to Scheme functions and syntax |
2706 | ||
2a52b429 MD |
2707 | ** Guile now correctly handles internal defines by rewriting them into |
2708 | their equivalent letrec. Previously, internal defines would | |
2709 | incrementally add to the innermost environment, without checking | |
2710 | whether the restrictions specified in RnRS were met. This lead to the | |
2711 | correct behaviour when these restriction actually were met, but didn't | |
2712 | catch all illegal uses. Such an illegal use could lead to crashes of | |
2713 | the Guile interpreter or or other unwanted results. An example of | |
2714 | incorrect internal defines that made Guile behave erratically: | |
2715 | ||
2716 | (let () | |
2717 | (define a 1) | |
2718 | (define (b) a) | |
2719 | (define c (1+ (b))) | |
2720 | (define d 3) | |
2721 | ||
2722 | (b)) | |
2723 | ||
2724 | => 2 | |
2725 | ||
2726 | The problem with this example is that the definition of `c' uses the | |
2727 | value of `b' directly. This confuses the meoization machine of Guile | |
2728 | so that the second call of `b' (this time in a larger environment that | |
2729 | also contains bindings for `c' and `d') refers to the binding of `c' | |
2730 | instead of `a'. You could also make Guile crash with a variation on | |
2731 | this theme: | |
2732 | ||
2733 | (define (foo flag) | |
2734 | (define a 1) | |
2735 | (define (b flag) (if flag a 1)) | |
2736 | (define c (1+ (b flag))) | |
2737 | (define d 3) | |
2738 | ||
2739 | (b #t)) | |
2740 | ||
2741 | (foo #f) | |
2742 | (foo #t) | |
2743 | ||
2744 | From now on, Guile will issue an `Unbound variable: b' error message | |
2745 | for both examples. | |
2746 | ||
36d3d540 MD |
2747 | ** Hooks |
2748 | ||
2749 | A hook contains a list of functions which should be called on | |
2750 | particular occasions in an existing program. Hooks are used for | |
2751 | customization. | |
2752 | ||
2753 | A window manager might have a hook before-window-map-hook. The window | |
2754 | manager uses the function run-hooks to call all functions stored in | |
2755 | before-window-map-hook each time a window is mapped. The user can | |
2756 | store functions in the hook using add-hook!. | |
2757 | ||
2758 | In Guile, hooks are first class objects. | |
2759 | ||
2760 | *** New function: make-hook [N_ARGS] | |
2761 | ||
2762 | Return a hook for hook functions which can take N_ARGS arguments. | |
2763 | The default value for N_ARGS is 0. | |
2764 | ||
ad91d6c3 MD |
2765 | (See also scm_make_named_hook below.) |
2766 | ||
36d3d540 MD |
2767 | *** New function: add-hook! HOOK PROC [APPEND_P] |
2768 | ||
2769 | Put PROC at the beginning of the list of functions stored in HOOK. | |
2770 | If APPEND_P is supplied, and non-false, put PROC at the end instead. | |
2771 | ||
2772 | PROC must be able to take the number of arguments specified when the | |
2773 | hook was created. | |
2774 | ||
2775 | If PROC already exists in HOOK, then remove it first. | |
2776 | ||
2777 | *** New function: remove-hook! HOOK PROC | |
2778 | ||
2779 | Remove PROC from the list of functions in HOOK. | |
2780 | ||
2781 | *** New function: reset-hook! HOOK | |
2782 | ||
2783 | Clear the list of hook functions stored in HOOK. | |
2784 | ||
2785 | *** New function: run-hook HOOK ARG1 ... | |
2786 | ||
2787 | Run all hook functions stored in HOOK with arguments ARG1 ... . | |
2788 | The number of arguments supplied must correspond to the number given | |
2789 | when the hook was created. | |
2790 | ||
56a19408 MV |
2791 | ** The function `dynamic-link' now takes optional keyword arguments. |
2792 | The only keyword argument that is currently defined is `:global | |
2793 | BOOL'. With it, you can control whether the shared library will be | |
2794 | linked in global mode or not. In global mode, the symbols from the | |
2795 | linked library can be used to resolve references from other | |
2796 | dynamically linked libraries. In non-global mode, the linked | |
2797 | library is essentially invisible and can only be accessed via | |
2798 | `dynamic-func', etc. The default is now to link in global mode. | |
2799 | Previously, the default has been non-global mode. | |
2800 | ||
2801 | The `#:global' keyword is only effective on platforms that support | |
2802 | the dlopen family of functions. | |
2803 | ||
ad226f25 | 2804 | ** New function `provided?' |
b7e13f65 JB |
2805 | |
2806 | - Function: provided? FEATURE | |
2807 | Return true iff FEATURE is supported by this installation of | |
2808 | Guile. FEATURE must be a symbol naming a feature; the global | |
2809 | variable `*features*' is a list of available features. | |
2810 | ||
ad226f25 JB |
2811 | ** Changes to the module (ice-9 expect): |
2812 | ||
2813 | *** The expect-strings macro now matches `$' in a regular expression | |
2814 | only at a line-break or end-of-file by default. Previously it would | |
ab711359 JB |
2815 | match the end of the string accumulated so far. The old behaviour |
2816 | can be obtained by setting the variable `expect-strings-exec-flags' | |
2817 | to 0. | |
ad226f25 JB |
2818 | |
2819 | *** The expect-strings macro now uses a variable `expect-strings-exec-flags' | |
2820 | for the regexp-exec flags. If `regexp/noteol' is included, then `$' | |
2821 | in a regular expression will still match before a line-break or | |
2822 | end-of-file. The default is `regexp/noteol'. | |
2823 | ||
6c0201ad | 2824 | *** The expect-strings macro now uses a variable |
ad226f25 JB |
2825 | `expect-strings-compile-flags' for the flags to be supplied to |
2826 | `make-regexp'. The default is `regexp/newline', which was previously | |
2827 | hard-coded. | |
2828 | ||
2829 | *** The expect macro now supplies two arguments to a match procedure: | |
ab711359 JB |
2830 | the current accumulated string and a flag to indicate whether |
2831 | end-of-file has been reached. Previously only the string was supplied. | |
2832 | If end-of-file is reached, the match procedure will be called an | |
2833 | additional time with the same accumulated string as the previous call | |
2834 | but with the flag set. | |
ad226f25 | 2835 | |
b7e13f65 JB |
2836 | ** New module (ice-9 format), implementing the Common Lisp `format' function. |
2837 | ||
2838 | This code, and the documentation for it that appears here, was | |
2839 | borrowed from SLIB, with minor adaptations for Guile. | |
2840 | ||
2841 | - Function: format DESTINATION FORMAT-STRING . ARGUMENTS | |
2842 | An almost complete implementation of Common LISP format description | |
2843 | according to the CL reference book `Common LISP' from Guy L. | |
2844 | Steele, Digital Press. Backward compatible to most of the | |
2845 | available Scheme format implementations. | |
2846 | ||
2847 | Returns `#t', `#f' or a string; has side effect of printing | |
2848 | according to FORMAT-STRING. If DESTINATION is `#t', the output is | |
2849 | to the current output port and `#t' is returned. If DESTINATION | |
2850 | is `#f', a formatted string is returned as the result of the call. | |
2851 | NEW: If DESTINATION is a string, DESTINATION is regarded as the | |
2852 | format string; FORMAT-STRING is then the first argument and the | |
2853 | output is returned as a string. If DESTINATION is a number, the | |
2854 | output is to the current error port if available by the | |
2855 | implementation. Otherwise DESTINATION must be an output port and | |
2856 | `#t' is returned. | |
2857 | ||
2858 | FORMAT-STRING must be a string. In case of a formatting error | |
2859 | format returns `#f' and prints a message on the current output or | |
2860 | error port. Characters are output as if the string were output by | |
2861 | the `display' function with the exception of those prefixed by a | |
2862 | tilde (~). For a detailed description of the FORMAT-STRING syntax | |
2863 | please consult a Common LISP format reference manual. For a test | |
2864 | suite to verify this format implementation load `formatst.scm'. | |
2865 | Please send bug reports to `lutzeb@cs.tu-berlin.de'. | |
2866 | ||
2867 | Note: `format' is not reentrant, i.e. only one `format'-call may | |
2868 | be executed at a time. | |
2869 | ||
2870 | ||
2871 | *** Format Specification (Format version 3.0) | |
2872 | ||
2873 | Please consult a Common LISP format reference manual for a detailed | |
2874 | description of the format string syntax. For a demonstration of the | |
2875 | implemented directives see `formatst.scm'. | |
2876 | ||
2877 | This implementation supports directive parameters and modifiers (`:' | |
2878 | and `@' characters). Multiple parameters must be separated by a comma | |
2879 | (`,'). Parameters can be numerical parameters (positive or negative), | |
2880 | character parameters (prefixed by a quote character (`''), variable | |
2881 | parameters (`v'), number of rest arguments parameter (`#'), empty and | |
2882 | default parameters. Directive characters are case independent. The | |
2883 | general form of a directive is: | |
2884 | ||
2885 | DIRECTIVE ::= ~{DIRECTIVE-PARAMETER,}[:][@]DIRECTIVE-CHARACTER | |
2886 | ||
2887 | DIRECTIVE-PARAMETER ::= [ [-|+]{0-9}+ | 'CHARACTER | v | # ] | |
2888 | ||
2889 | *** Implemented CL Format Control Directives | |
2890 | ||
2891 | Documentation syntax: Uppercase characters represent the | |
2892 | corresponding control directive characters. Lowercase characters | |
2893 | represent control directive parameter descriptions. | |
2894 | ||
2895 | `~A' | |
2896 | Any (print as `display' does). | |
2897 | `~@A' | |
2898 | left pad. | |
2899 | ||
2900 | `~MINCOL,COLINC,MINPAD,PADCHARA' | |
2901 | full padding. | |
2902 | ||
2903 | `~S' | |
2904 | S-expression (print as `write' does). | |
2905 | `~@S' | |
2906 | left pad. | |
2907 | ||
2908 | `~MINCOL,COLINC,MINPAD,PADCHARS' | |
2909 | full padding. | |
2910 | ||
2911 | `~D' | |
2912 | Decimal. | |
2913 | `~@D' | |
2914 | print number sign always. | |
2915 | ||
2916 | `~:D' | |
2917 | print comma separated. | |
2918 | ||
2919 | `~MINCOL,PADCHAR,COMMACHARD' | |
2920 | padding. | |
2921 | ||
2922 | `~X' | |
2923 | Hexadecimal. | |
2924 | `~@X' | |
2925 | print number sign always. | |
2926 | ||
2927 | `~:X' | |
2928 | print comma separated. | |
2929 | ||
2930 | `~MINCOL,PADCHAR,COMMACHARX' | |
2931 | padding. | |
2932 | ||
2933 | `~O' | |
2934 | Octal. | |
2935 | `~@O' | |
2936 | print number sign always. | |
2937 | ||
2938 | `~:O' | |
2939 | print comma separated. | |
2940 | ||
2941 | `~MINCOL,PADCHAR,COMMACHARO' | |
2942 | padding. | |
2943 | ||
2944 | `~B' | |
2945 | Binary. | |
2946 | `~@B' | |
2947 | print number sign always. | |
2948 | ||
2949 | `~:B' | |
2950 | print comma separated. | |
2951 | ||
2952 | `~MINCOL,PADCHAR,COMMACHARB' | |
2953 | padding. | |
2954 | ||
2955 | `~NR' | |
2956 | Radix N. | |
2957 | `~N,MINCOL,PADCHAR,COMMACHARR' | |
2958 | padding. | |
2959 | ||
2960 | `~@R' | |
2961 | print a number as a Roman numeral. | |
2962 | ||
2963 | `~:@R' | |
2964 | print a number as an "old fashioned" Roman numeral. | |
2965 | ||
2966 | `~:R' | |
2967 | print a number as an ordinal English number. | |
2968 | ||
2969 | `~:@R' | |
2970 | print a number as a cardinal English number. | |
2971 | ||
2972 | `~P' | |
2973 | Plural. | |
2974 | `~@P' | |
2975 | prints `y' and `ies'. | |
2976 | ||
2977 | `~:P' | |
2978 | as `~P but jumps 1 argument backward.' | |
2979 | ||
2980 | `~:@P' | |
2981 | as `~@P but jumps 1 argument backward.' | |
2982 | ||
2983 | `~C' | |
2984 | Character. | |
2985 | `~@C' | |
2986 | prints a character as the reader can understand it (i.e. `#\' | |
2987 | prefixing). | |
2988 | ||
2989 | `~:C' | |
2990 | prints a character as emacs does (eg. `^C' for ASCII 03). | |
2991 | ||
2992 | `~F' | |
2993 | Fixed-format floating-point (prints a flonum like MMM.NNN). | |
2994 | `~WIDTH,DIGITS,SCALE,OVERFLOWCHAR,PADCHARF' | |
2995 | `~@F' | |
2996 | If the number is positive a plus sign is printed. | |
2997 | ||
2998 | `~E' | |
2999 | Exponential floating-point (prints a flonum like MMM.NNN`E'EE). | |
3000 | `~WIDTH,DIGITS,EXPONENTDIGITS,SCALE,OVERFLOWCHAR,PADCHAR,EXPONENTCHARE' | |
3001 | `~@E' | |
3002 | If the number is positive a plus sign is printed. | |
3003 | ||
3004 | `~G' | |
3005 | General floating-point (prints a flonum either fixed or | |
3006 | exponential). | |
3007 | `~WIDTH,DIGITS,EXPONENTDIGITS,SCALE,OVERFLOWCHAR,PADCHAR,EXPONENTCHARG' | |
3008 | `~@G' | |
3009 | If the number is positive a plus sign is printed. | |
3010 | ||
3011 | `~$' | |
3012 | Dollars floating-point (prints a flonum in fixed with signs | |
3013 | separated). | |
3014 | `~DIGITS,SCALE,WIDTH,PADCHAR$' | |
3015 | `~@$' | |
3016 | If the number is positive a plus sign is printed. | |
3017 | ||
3018 | `~:@$' | |
3019 | A sign is always printed and appears before the padding. | |
3020 | ||
3021 | `~:$' | |
3022 | The sign appears before the padding. | |
3023 | ||
3024 | `~%' | |
3025 | Newline. | |
3026 | `~N%' | |
3027 | print N newlines. | |
3028 | ||
3029 | `~&' | |
3030 | print newline if not at the beginning of the output line. | |
3031 | `~N&' | |
3032 | prints `~&' and then N-1 newlines. | |
3033 | ||
3034 | `~|' | |
3035 | Page Separator. | |
3036 | `~N|' | |
3037 | print N page separators. | |
3038 | ||
3039 | `~~' | |
3040 | Tilde. | |
3041 | `~N~' | |
3042 | print N tildes. | |
3043 | ||
3044 | `~'<newline> | |
3045 | Continuation Line. | |
3046 | `~:'<newline> | |
3047 | newline is ignored, white space left. | |
3048 | ||
3049 | `~@'<newline> | |
3050 | newline is left, white space ignored. | |
3051 | ||
3052 | `~T' | |
3053 | Tabulation. | |
3054 | `~@T' | |
3055 | relative tabulation. | |
3056 | ||
3057 | `~COLNUM,COLINCT' | |
3058 | full tabulation. | |
3059 | ||
3060 | `~?' | |
3061 | Indirection (expects indirect arguments as a list). | |
3062 | `~@?' | |
3063 | extracts indirect arguments from format arguments. | |
3064 | ||
3065 | `~(STR~)' | |
3066 | Case conversion (converts by `string-downcase'). | |
3067 | `~:(STR~)' | |
3068 | converts by `string-capitalize'. | |
3069 | ||
3070 | `~@(STR~)' | |
3071 | converts by `string-capitalize-first'. | |
3072 | ||
3073 | `~:@(STR~)' | |
3074 | converts by `string-upcase'. | |
3075 | ||
3076 | `~*' | |
3077 | Argument Jumping (jumps 1 argument forward). | |
3078 | `~N*' | |
3079 | jumps N arguments forward. | |
3080 | ||
3081 | `~:*' | |
3082 | jumps 1 argument backward. | |
3083 | ||
3084 | `~N:*' | |
3085 | jumps N arguments backward. | |
3086 | ||
3087 | `~@*' | |
3088 | jumps to the 0th argument. | |
3089 | ||
3090 | `~N@*' | |
3091 | jumps to the Nth argument (beginning from 0) | |
3092 | ||
3093 | `~[STR0~;STR1~;...~;STRN~]' | |
3094 | Conditional Expression (numerical clause conditional). | |
3095 | `~N[' | |
3096 | take argument from N. | |
3097 | ||
3098 | `~@[' | |
3099 | true test conditional. | |
3100 | ||
3101 | `~:[' | |
3102 | if-else-then conditional. | |
3103 | ||
3104 | `~;' | |
3105 | clause separator. | |
3106 | ||
3107 | `~:;' | |
3108 | default clause follows. | |
3109 | ||
3110 | `~{STR~}' | |
3111 | Iteration (args come from the next argument (a list)). | |
3112 | `~N{' | |
3113 | at most N iterations. | |
3114 | ||
3115 | `~:{' | |
3116 | args from next arg (a list of lists). | |
3117 | ||
3118 | `~@{' | |
3119 | args from the rest of arguments. | |
3120 | ||
3121 | `~:@{' | |
3122 | args from the rest args (lists). | |
3123 | ||
3124 | `~^' | |
3125 | Up and out. | |
3126 | `~N^' | |
3127 | aborts if N = 0 | |
3128 | ||
3129 | `~N,M^' | |
3130 | aborts if N = M | |
3131 | ||
3132 | `~N,M,K^' | |
3133 | aborts if N <= M <= K | |
3134 | ||
3135 | *** Not Implemented CL Format Control Directives | |
3136 | ||
3137 | `~:A' | |
3138 | print `#f' as an empty list (see below). | |
3139 | ||
3140 | `~:S' | |
3141 | print `#f' as an empty list (see below). | |
3142 | ||
3143 | `~<~>' | |
3144 | Justification. | |
3145 | ||
3146 | `~:^' | |
3147 | (sorry I don't understand its semantics completely) | |
3148 | ||
3149 | *** Extended, Replaced and Additional Control Directives | |
3150 | ||
3151 | `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHD' | |
3152 | `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHX' | |
3153 | `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHO' | |
3154 | `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHB' | |
3155 | `~N,MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHR' | |
3156 | COMMAWIDTH is the number of characters between two comma | |
3157 | characters. | |
3158 | ||
3159 | `~I' | |
3160 | print a R4RS complex number as `~F~@Fi' with passed parameters for | |
3161 | `~F'. | |
3162 | ||
3163 | `~Y' | |
3164 | Pretty print formatting of an argument for scheme code lists. | |
3165 | ||
3166 | `~K' | |
3167 | Same as `~?.' | |
3168 | ||
3169 | `~!' | |
3170 | Flushes the output if format DESTINATION is a port. | |
3171 | ||
3172 | `~_' | |
3173 | Print a `#\space' character | |
3174 | `~N_' | |
3175 | print N `#\space' characters. | |
3176 | ||
3177 | `~/' | |
3178 | Print a `#\tab' character | |
3179 | `~N/' | |
3180 | print N `#\tab' characters. | |
3181 | ||
3182 | `~NC' | |
3183 | Takes N as an integer representation for a character. No arguments | |
3184 | are consumed. N is converted to a character by `integer->char'. N | |
3185 | must be a positive decimal number. | |
3186 | ||
3187 | `~:S' | |
3188 | Print out readproof. Prints out internal objects represented as | |
3189 | `#<...>' as strings `"#<...>"' so that the format output can always | |
3190 | be processed by `read'. | |
3191 | ||
3192 | `~:A' | |
3193 | Print out readproof. Prints out internal objects represented as | |
3194 | `#<...>' as strings `"#<...>"' so that the format output can always | |
3195 | be processed by `read'. | |
3196 | ||
3197 | `~Q' | |
3198 | Prints information and a copyright notice on the format | |
3199 | implementation. | |
3200 | `~:Q' | |
3201 | prints format version. | |
3202 | ||
3203 | `~F, ~E, ~G, ~$' | |
3204 | may also print number strings, i.e. passing a number as a string | |
3205 | and format it accordingly. | |
3206 | ||
3207 | *** Configuration Variables | |
3208 | ||
3209 | The format module exports some configuration variables to suit the | |
3210 | systems and users needs. There should be no modification necessary for | |
3211 | the configuration that comes with Guile. Format detects automatically | |
3212 | if the running scheme system implements floating point numbers and | |
3213 | complex numbers. | |
3214 | ||
3215 | format:symbol-case-conv | |
3216 | Symbols are converted by `symbol->string' so the case type of the | |
3217 | printed symbols is implementation dependent. | |
3218 | `format:symbol-case-conv' is a one arg closure which is either | |
3219 | `#f' (no conversion), `string-upcase', `string-downcase' or | |
3220 | `string-capitalize'. (default `#f') | |
3221 | ||
3222 | format:iobj-case-conv | |
3223 | As FORMAT:SYMBOL-CASE-CONV but applies for the representation of | |
3224 | implementation internal objects. (default `#f') | |
3225 | ||
3226 | format:expch | |
3227 | The character prefixing the exponent value in `~E' printing. | |
3228 | (default `#\E') | |
3229 | ||
3230 | *** Compatibility With Other Format Implementations | |
3231 | ||
3232 | SLIB format 2.x: | |
3233 | See `format.doc'. | |
3234 | ||
3235 | SLIB format 1.4: | |
3236 | Downward compatible except for padding support and `~A', `~S', | |
3237 | `~P', `~X' uppercase printing. SLIB format 1.4 uses C-style | |
3238 | `printf' padding support which is completely replaced by the CL | |
3239 | `format' padding style. | |
3240 | ||
3241 | MIT C-Scheme 7.1: | |
3242 | Downward compatible except for `~', which is not documented | |
3243 | (ignores all characters inside the format string up to a newline | |
3244 | character). (7.1 implements `~a', `~s', ~NEWLINE, `~~', `~%', | |
3245 | numerical and variable parameters and `:/@' modifiers in the CL | |
3246 | sense). | |
3247 | ||
3248 | Elk 1.5/2.0: | |
3249 | Downward compatible except for `~A' and `~S' which print in | |
3250 | uppercase. (Elk implements `~a', `~s', `~~', and `~%' (no | |
3251 | directive parameters or modifiers)). | |
3252 | ||
3253 | Scheme->C 01nov91: | |
3254 | Downward compatible except for an optional destination parameter: | |
3255 | S2C accepts a format call without a destination which returns a | |
3256 | formatted string. This is equivalent to a #f destination in S2C. | |
3257 | (S2C implements `~a', `~s', `~c', `~%', and `~~' (no directive | |
3258 | parameters or modifiers)). | |
3259 | ||
3260 | ||
e7d37b0a | 3261 | ** Changes to string-handling functions. |
b7e13f65 | 3262 | |
e7d37b0a | 3263 | These functions were added to support the (ice-9 format) module, above. |
b7e13f65 | 3264 | |
e7d37b0a JB |
3265 | *** New function: string-upcase STRING |
3266 | *** New function: string-downcase STRING | |
b7e13f65 | 3267 | |
e7d37b0a JB |
3268 | These are non-destructive versions of the existing string-upcase! and |
3269 | string-downcase! functions. | |
b7e13f65 | 3270 | |
e7d37b0a JB |
3271 | *** New function: string-capitalize! STRING |
3272 | *** New function: string-capitalize STRING | |
3273 | ||
3274 | These functions convert the first letter of each word in the string to | |
3275 | upper case. Thus: | |
3276 | ||
3277 | (string-capitalize "howdy there") | |
3278 | => "Howdy There" | |
3279 | ||
3280 | As with the other functions, string-capitalize! modifies the string in | |
3281 | place, while string-capitalize returns a modified copy of its argument. | |
3282 | ||
3283 | *** New function: string-ci->symbol STRING | |
3284 | ||
3285 | Return a symbol whose name is STRING, but having the same case as if | |
3286 | the symbol had be read by `read'. | |
3287 | ||
3288 | Guile can be configured to be sensitive or insensitive to case | |
3289 | differences in Scheme identifiers. If Guile is case-insensitive, all | |
3290 | symbols are converted to lower case on input. The `string-ci->symbol' | |
3291 | function returns a symbol whose name in STRING, transformed as Guile | |
3292 | would if STRING were input. | |
3293 | ||
3294 | *** New function: substring-move! STRING1 START END STRING2 START | |
3295 | ||
3296 | Copy the substring of STRING1 from START (inclusive) to END | |
3297 | (exclusive) to STRING2 at START. STRING1 and STRING2 may be the same | |
3298 | string, and the source and destination areas may overlap; in all | |
3299 | cases, the function behaves as if all the characters were copied | |
3300 | simultanously. | |
3301 | ||
6c0201ad | 3302 | *** Extended functions: substring-move-left! substring-move-right! |
e7d37b0a JB |
3303 | |
3304 | These functions now correctly copy arbitrarily overlapping substrings; | |
3305 | they are both synonyms for substring-move!. | |
b7e13f65 | 3306 | |
b7e13f65 | 3307 | |
deaceb4e JB |
3308 | ** New module (ice-9 getopt-long), with the function `getopt-long'. |
3309 | ||
3310 | getopt-long is a function for parsing command-line arguments in a | |
3311 | manner consistent with other GNU programs. | |
3312 | ||
3313 | (getopt-long ARGS GRAMMAR) | |
3314 | Parse the arguments ARGS according to the argument list grammar GRAMMAR. | |
3315 | ||
3316 | ARGS should be a list of strings. Its first element should be the | |
3317 | name of the program; subsequent elements should be the arguments | |
3318 | that were passed to the program on the command line. The | |
3319 | `program-arguments' procedure returns a list of this form. | |
3320 | ||
3321 | GRAMMAR is a list of the form: | |
3322 | ((OPTION (PROPERTY VALUE) ...) ...) | |
3323 | ||
3324 | Each OPTION should be a symbol. `getopt-long' will accept a | |
3325 | command-line option named `--OPTION'. | |
3326 | Each option can have the following (PROPERTY VALUE) pairs: | |
3327 | ||
3328 | (single-char CHAR) --- Accept `-CHAR' as a single-character | |
3329 | equivalent to `--OPTION'. This is how to specify traditional | |
3330 | Unix-style flags. | |
3331 | (required? BOOL) --- If BOOL is true, the option is required. | |
3332 | getopt-long will raise an error if it is not found in ARGS. | |
3333 | (value BOOL) --- If BOOL is #t, the option accepts a value; if | |
3334 | it is #f, it does not; and if it is the symbol | |
3335 | `optional', the option may appear in ARGS with or | |
6c0201ad | 3336 | without a value. |
deaceb4e JB |
3337 | (predicate FUNC) --- If the option accepts a value (i.e. you |
3338 | specified `(value #t)' for this option), then getopt | |
3339 | will apply FUNC to the value, and throw an exception | |
3340 | if it returns #f. FUNC should be a procedure which | |
3341 | accepts a string and returns a boolean value; you may | |
3342 | need to use quasiquotes to get it into GRAMMAR. | |
3343 | ||
3344 | The (PROPERTY VALUE) pairs may occur in any order, but each | |
3345 | property may occur only once. By default, options do not have | |
3346 | single-character equivalents, are not required, and do not take | |
3347 | values. | |
3348 | ||
3349 | In ARGS, single-character options may be combined, in the usual | |
3350 | Unix fashion: ("-x" "-y") is equivalent to ("-xy"). If an option | |
3351 | accepts values, then it must be the last option in the | |
3352 | combination; the value is the next argument. So, for example, using | |
3353 | the following grammar: | |
3354 | ((apples (single-char #\a)) | |
3355 | (blimps (single-char #\b) (value #t)) | |
3356 | (catalexis (single-char #\c) (value #t))) | |
3357 | the following argument lists would be acceptable: | |
3358 | ("-a" "-b" "bang" "-c" "couth") ("bang" and "couth" are the values | |
3359 | for "blimps" and "catalexis") | |
3360 | ("-ab" "bang" "-c" "couth") (same) | |
3361 | ("-ac" "couth" "-b" "bang") (same) | |
3362 | ("-abc" "couth" "bang") (an error, since `-b' is not the | |
3363 | last option in its combination) | |
3364 | ||
3365 | If an option's value is optional, then `getopt-long' decides | |
3366 | whether it has a value by looking at what follows it in ARGS. If | |
3367 | the next element is a string, and it does not appear to be an | |
3368 | option itself, then that string is the option's value. | |
3369 | ||
3370 | The value of a long option can appear as the next element in ARGS, | |
3371 | or it can follow the option name, separated by an `=' character. | |
3372 | Thus, using the same grammar as above, the following argument lists | |
3373 | are equivalent: | |
3374 | ("--apples" "Braeburn" "--blimps" "Goodyear") | |
3375 | ("--apples=Braeburn" "--blimps" "Goodyear") | |
3376 | ("--blimps" "Goodyear" "--apples=Braeburn") | |
3377 | ||
3378 | If the option "--" appears in ARGS, argument parsing stops there; | |
3379 | subsequent arguments are returned as ordinary arguments, even if | |
3380 | they resemble options. So, in the argument list: | |
3381 | ("--apples" "Granny Smith" "--" "--blimp" "Goodyear") | |
3382 | `getopt-long' will recognize the `apples' option as having the | |
3383 | value "Granny Smith", but it will not recognize the `blimp' | |
3384 | option; it will return the strings "--blimp" and "Goodyear" as | |
3385 | ordinary argument strings. | |
3386 | ||
3387 | The `getopt-long' function returns the parsed argument list as an | |
3388 | assocation list, mapping option names --- the symbols from GRAMMAR | |
3389 | --- onto their values, or #t if the option does not accept a value. | |
3390 | Unused options do not appear in the alist. | |
3391 | ||
3392 | All arguments that are not the value of any option are returned | |
3393 | as a list, associated with the empty list. | |
3394 | ||
3395 | `getopt-long' throws an exception if: | |
3396 | - it finds an unrecognized option in ARGS | |
3397 | - a required option is omitted | |
3398 | - an option that requires an argument doesn't get one | |
3399 | - an option that doesn't accept an argument does get one (this can | |
3400 | only happen using the long option `--opt=value' syntax) | |
3401 | - an option predicate fails | |
3402 | ||
3403 | So, for example: | |
3404 | ||
3405 | (define grammar | |
3406 | `((lockfile-dir (required? #t) | |
3407 | (value #t) | |
3408 | (single-char #\k) | |
3409 | (predicate ,file-is-directory?)) | |
3410 | (verbose (required? #f) | |
3411 | (single-char #\v) | |
3412 | (value #f)) | |
3413 | (x-includes (single-char #\x)) | |
6c0201ad | 3414 | (rnet-server (single-char #\y) |
deaceb4e JB |
3415 | (predicate ,string?)))) |
3416 | ||
6c0201ad | 3417 | (getopt-long '("my-prog" "-vk" "/tmp" "foo1" "--x-includes=/usr/include" |
deaceb4e JB |
3418 | "--rnet-server=lamprod" "--" "-fred" "foo2" "foo3") |
3419 | grammar) | |
3420 | => ((() "foo1" "-fred" "foo2" "foo3") | |
3421 | (rnet-server . "lamprod") | |
3422 | (x-includes . "/usr/include") | |
3423 | (lockfile-dir . "/tmp") | |
3424 | (verbose . #t)) | |
3425 | ||
3426 | ** The (ice-9 getopt-gnu-style) module is obsolete; use (ice-9 getopt-long). | |
3427 | ||
3428 | It will be removed in a few releases. | |
3429 | ||
08394899 MS |
3430 | ** New syntax: lambda* |
3431 | ** New syntax: define* | |
6c0201ad | 3432 | ** New syntax: define*-public |
08394899 MS |
3433 | ** New syntax: defmacro* |
3434 | ** New syntax: defmacro*-public | |
6c0201ad | 3435 | Guile now supports optional arguments. |
08394899 MS |
3436 | |
3437 | `lambda*', `define*', `define*-public', `defmacro*' and | |
3438 | `defmacro*-public' are identical to the non-* versions except that | |
3439 | they use an extended type of parameter list that has the following BNF | |
3440 | syntax (parentheses are literal, square brackets indicate grouping, | |
3441 | and `*', `+' and `?' have the usual meaning): | |
3442 | ||
3443 | ext-param-list ::= ( [identifier]* [#&optional [ext-var-decl]+]? | |
6c0201ad | 3444 | [#&key [ext-var-decl]+ [#&allow-other-keys]?]? |
08394899 MS |
3445 | [[#&rest identifier]|[. identifier]]? ) | [identifier] |
3446 | ||
6c0201ad | 3447 | ext-var-decl ::= identifier | ( identifier expression ) |
08394899 MS |
3448 | |
3449 | The semantics are best illustrated with the following documentation | |
3450 | and examples for `lambda*': | |
3451 | ||
3452 | lambda* args . body | |
3453 | lambda extended for optional and keyword arguments | |
6c0201ad | 3454 | |
08394899 MS |
3455 | lambda* creates a procedure that takes optional arguments. These |
3456 | are specified by putting them inside brackets at the end of the | |
3457 | paramater list, but before any dotted rest argument. For example, | |
3458 | (lambda* (a b #&optional c d . e) '()) | |
3459 | creates a procedure with fixed arguments a and b, optional arguments c | |
3460 | and d, and rest argument e. If the optional arguments are omitted | |
3461 | in a call, the variables for them are unbound in the procedure. This | |
3462 | can be checked with the bound? macro. | |
3463 | ||
3464 | lambda* can also take keyword arguments. For example, a procedure | |
3465 | defined like this: | |
3466 | (lambda* (#&key xyzzy larch) '()) | |
3467 | can be called with any of the argument lists (#:xyzzy 11) | |
3468 | (#:larch 13) (#:larch 42 #:xyzzy 19) (). Whichever arguments | |
3469 | are given as keywords are bound to values. | |
3470 | ||
3471 | Optional and keyword arguments can also be given default values | |
3472 | which they take on when they are not present in a call, by giving a | |
3473 | two-item list in place of an optional argument, for example in: | |
6c0201ad | 3474 | (lambda* (foo #&optional (bar 42) #&key (baz 73)) (list foo bar baz)) |
08394899 MS |
3475 | foo is a fixed argument, bar is an optional argument with default |
3476 | value 42, and baz is a keyword argument with default value 73. | |
3477 | Default value expressions are not evaluated unless they are needed | |
6c0201ad | 3478 | and until the procedure is called. |
08394899 MS |
3479 | |
3480 | lambda* now supports two more special parameter list keywords. | |
3481 | ||
3482 | lambda*-defined procedures now throw an error by default if a | |
3483 | keyword other than one of those specified is found in the actual | |
3484 | passed arguments. However, specifying #&allow-other-keys | |
3485 | immediately after the kyword argument declarations restores the | |
3486 | previous behavior of ignoring unknown keywords. lambda* also now | |
3487 | guarantees that if the same keyword is passed more than once, the | |
3488 | last one passed is the one that takes effect. For example, | |
3489 | ((lambda* (#&key (heads 0) (tails 0)) (display (list heads tails))) | |
3490 | #:heads 37 #:tails 42 #:heads 99) | |
3491 | would result in (99 47) being displayed. | |
3492 | ||
3493 | #&rest is also now provided as a synonym for the dotted syntax rest | |
3494 | argument. The argument lists (a . b) and (a #&rest b) are equivalent in | |
3495 | all respects to lambda*. This is provided for more similarity to DSSSL, | |
3496 | MIT-Scheme and Kawa among others, as well as for refugees from other | |
3497 | Lisp dialects. | |
3498 | ||
3499 | Further documentation may be found in the optargs.scm file itself. | |
3500 | ||
3501 | The optional argument module also exports the macros `let-optional', | |
3502 | `let-optional*', `let-keywords', `let-keywords*' and `bound?'. These | |
3503 | are not documented here because they may be removed in the future, but | |
3504 | full documentation is still available in optargs.scm. | |
3505 | ||
2e132553 JB |
3506 | ** New syntax: and-let* |
3507 | Guile now supports the `and-let*' form, described in the draft SRFI-2. | |
3508 | ||
3509 | Syntax: (land* (<clause> ...) <body> ...) | |
3510 | Each <clause> should have one of the following forms: | |
3511 | (<variable> <expression>) | |
3512 | (<expression>) | |
3513 | <bound-variable> | |
3514 | Each <variable> or <bound-variable> should be an identifier. Each | |
3515 | <expression> should be a valid expression. The <body> should be a | |
3516 | possibly empty sequence of expressions, like the <body> of a | |
3517 | lambda form. | |
3518 | ||
3519 | Semantics: A LAND* expression is evaluated by evaluating the | |
3520 | <expression> or <bound-variable> of each of the <clause>s from | |
3521 | left to right. The value of the first <expression> or | |
3522 | <bound-variable> that evaluates to a false value is returned; the | |
3523 | remaining <expression>s and <bound-variable>s are not evaluated. | |
3524 | The <body> forms are evaluated iff all the <expression>s and | |
3525 | <bound-variable>s evaluate to true values. | |
3526 | ||
3527 | The <expression>s and the <body> are evaluated in an environment | |
3528 | binding each <variable> of the preceding (<variable> <expression>) | |
3529 | clauses to the value of the <expression>. Later bindings | |
3530 | shadow earlier bindings. | |
3531 | ||
3532 | Guile's and-let* macro was contributed by Michael Livshin. | |
3533 | ||
36d3d540 MD |
3534 | ** New sorting functions |
3535 | ||
3536 | *** New function: sorted? SEQUENCE LESS? | |
ed8c8636 MD |
3537 | Returns `#t' when the sequence argument is in non-decreasing order |
3538 | according to LESS? (that is, there is no adjacent pair `... x y | |
3539 | ...' for which `(less? y x)'). | |
3540 | ||
3541 | Returns `#f' when the sequence contains at least one out-of-order | |
3542 | pair. It is an error if the sequence is neither a list nor a | |
3543 | vector. | |
3544 | ||
36d3d540 | 3545 | *** New function: merge LIST1 LIST2 LESS? |
ed8c8636 MD |
3546 | LIST1 and LIST2 are sorted lists. |
3547 | Returns the sorted list of all elements in LIST1 and LIST2. | |
3548 | ||
3549 | Assume that the elements a and b1 in LIST1 and b2 in LIST2 are "equal" | |
3550 | in the sense that (LESS? x y) --> #f for x, y in {a, b1, b2}, | |
3551 | and that a < b1 in LIST1. Then a < b1 < b2 in the result. | |
3552 | (Here "<" should read "comes before".) | |
3553 | ||
36d3d540 | 3554 | *** New procedure: merge! LIST1 LIST2 LESS? |
ed8c8636 MD |
3555 | Merges two lists, re-using the pairs of LIST1 and LIST2 to build |
3556 | the result. If the code is compiled, and LESS? constructs no new | |
3557 | pairs, no pairs at all will be allocated. The first pair of the | |
3558 | result will be either the first pair of LIST1 or the first pair of | |
3559 | LIST2. | |
3560 | ||
36d3d540 | 3561 | *** New function: sort SEQUENCE LESS? |
ed8c8636 MD |
3562 | Accepts either a list or a vector, and returns a new sequence |
3563 | which is sorted. The new sequence is the same type as the input. | |
3564 | Always `(sorted? (sort sequence less?) less?)'. The original | |
3565 | sequence is not altered in any way. The new sequence shares its | |
3566 | elements with the old one; no elements are copied. | |
3567 | ||
36d3d540 | 3568 | *** New procedure: sort! SEQUENCE LESS |
ed8c8636 MD |
3569 | Returns its sorted result in the original boxes. No new storage is |
3570 | allocated at all. Proper usage: (set! slist (sort! slist <)) | |
3571 | ||
36d3d540 | 3572 | *** New function: stable-sort SEQUENCE LESS? |
ed8c8636 MD |
3573 | Similar to `sort' but stable. That is, if "equal" elements are |
3574 | ordered a < b in the original sequence, they will have the same order | |
3575 | in the result. | |
3576 | ||
36d3d540 | 3577 | *** New function: stable-sort! SEQUENCE LESS? |
ed8c8636 MD |
3578 | Similar to `sort!' but stable. |
3579 | Uses temporary storage when sorting vectors. | |
3580 | ||
36d3d540 | 3581 | *** New functions: sort-list, sort-list! |
ed8c8636 MD |
3582 | Added for compatibility with scsh. |
3583 | ||
36d3d540 MD |
3584 | ** New built-in random number support |
3585 | ||
3586 | *** New function: random N [STATE] | |
3e8370c3 MD |
3587 | Accepts a positive integer or real N and returns a number of the |
3588 | same type between zero (inclusive) and N (exclusive). The values | |
3589 | returned have a uniform distribution. | |
3590 | ||
3591 | The optional argument STATE must be of the type produced by | |
416075f1 MD |
3592 | `copy-random-state' or `seed->random-state'. It defaults to the value |
3593 | of the variable `*random-state*'. This object is used to maintain the | |
3594 | state of the pseudo-random-number generator and is altered as a side | |
3595 | effect of the `random' operation. | |
3e8370c3 | 3596 | |
36d3d540 | 3597 | *** New variable: *random-state* |
3e8370c3 MD |
3598 | Holds a data structure that encodes the internal state of the |
3599 | random-number generator that `random' uses by default. The nature | |
3600 | of this data structure is implementation-dependent. It may be | |
3601 | printed out and successfully read back in, but may or may not | |
3602 | function correctly as a random-number state object in another | |
3603 | implementation. | |
3604 | ||
36d3d540 | 3605 | *** New function: copy-random-state [STATE] |
3e8370c3 MD |
3606 | Returns a new object of type suitable for use as the value of the |
3607 | variable `*random-state*' and as a second argument to `random'. | |
3608 | If argument STATE is given, a copy of it is returned. Otherwise a | |
3609 | copy of `*random-state*' is returned. | |
416075f1 | 3610 | |
36d3d540 | 3611 | *** New function: seed->random-state SEED |
416075f1 MD |
3612 | Returns a new object of type suitable for use as the value of the |
3613 | variable `*random-state*' and as a second argument to `random'. | |
3614 | SEED is a string or a number. A new state is generated and | |
3615 | initialized using SEED. | |
3e8370c3 | 3616 | |
36d3d540 | 3617 | *** New function: random:uniform [STATE] |
3e8370c3 MD |
3618 | Returns an uniformly distributed inexact real random number in the |
3619 | range between 0 and 1. | |
3620 | ||
36d3d540 | 3621 | *** New procedure: random:solid-sphere! VECT [STATE] |
3e8370c3 MD |
3622 | Fills VECT with inexact real random numbers the sum of whose |
3623 | squares is less than 1.0. Thinking of VECT as coordinates in | |
3624 | space of dimension N = `(vector-length VECT)', the coordinates are | |
3625 | uniformly distributed within the unit N-shere. The sum of the | |
3626 | squares of the numbers is returned. VECT can be either a vector | |
3627 | or a uniform vector of doubles. | |
3628 | ||
36d3d540 | 3629 | *** New procedure: random:hollow-sphere! VECT [STATE] |
3e8370c3 MD |
3630 | Fills VECT with inexact real random numbers the sum of whose squares |
3631 | is equal to 1.0. Thinking of VECT as coordinates in space of | |
3632 | dimension n = `(vector-length VECT)', the coordinates are uniformly | |
3633 | distributed over the surface of the unit n-shere. VECT can be either | |
3634 | a vector or a uniform vector of doubles. | |
3635 | ||
36d3d540 | 3636 | *** New function: random:normal [STATE] |
3e8370c3 MD |
3637 | Returns an inexact real in a normal distribution with mean 0 and |
3638 | standard deviation 1. For a normal distribution with mean M and | |
3639 | standard deviation D use `(+ M (* D (random:normal)))'. | |
3640 | ||
36d3d540 | 3641 | *** New procedure: random:normal-vector! VECT [STATE] |
3e8370c3 MD |
3642 | Fills VECT with inexact real random numbers which are independent and |
3643 | standard normally distributed (i.e., with mean 0 and variance 1). | |
3644 | VECT can be either a vector or a uniform vector of doubles. | |
3645 | ||
36d3d540 | 3646 | *** New function: random:exp STATE |
3e8370c3 MD |
3647 | Returns an inexact real in an exponential distribution with mean 1. |
3648 | For an exponential distribution with mean U use (* U (random:exp)). | |
3649 | ||
69c6acbb JB |
3650 | ** The range of logand, logior, logxor, logtest, and logbit? have changed. |
3651 | ||
3652 | These functions now operate on numbers in the range of a C unsigned | |
3653 | long. | |
3654 | ||
3655 | These functions used to operate on numbers in the range of a C signed | |
3656 | long; however, this seems inappropriate, because Guile integers don't | |
3657 | overflow. | |
3658 | ||
ba4ee0d6 MD |
3659 | ** New function: make-guardian |
3660 | This is an implementation of guardians as described in | |
3661 | R. Kent Dybvig, Carl Bruggeman, and David Eby (1993) "Guardians in a | |
3662 | Generation-Based Garbage Collector" ACM SIGPLAN Conference on | |
3663 | Programming Language Design and Implementation, June 1993 | |
3664 | ftp://ftp.cs.indiana.edu/pub/scheme-repository/doc/pubs/guardians.ps.gz | |
3665 | ||
88ceea5c MD |
3666 | ** New functions: delq1!, delv1!, delete1! |
3667 | These procedures behave similar to delq! and friends but delete only | |
3668 | one object if at all. | |
3669 | ||
55254a6a MD |
3670 | ** New function: unread-string STRING PORT |
3671 | Unread STRING to PORT, that is, push it back onto the port so that | |
3672 | next read operation will work on the pushed back characters. | |
3673 | ||
3674 | ** unread-char can now be called multiple times | |
3675 | If unread-char is called multiple times, the unread characters will be | |
3676 | read again in last-in first-out order. | |
3677 | ||
9e97c52d GH |
3678 | ** the procedures uniform-array-read! and uniform-array-write! now |
3679 | work on any kind of port, not just ports which are open on a file. | |
3680 | ||
b074884f | 3681 | ** Now 'l' in a port mode requests line buffering. |
9e97c52d | 3682 | |
69bc9ff3 GH |
3683 | ** The procedure truncate-file now works on string ports as well |
3684 | as file ports. If the size argument is omitted, the current | |
1b9c3dae | 3685 | file position is used. |
9e97c52d | 3686 | |
c94577b4 | 3687 | ** new procedure: seek PORT/FDES OFFSET WHENCE |
9e97c52d GH |
3688 | The arguments are the same as for the old fseek procedure, but it |
3689 | works on string ports as well as random-access file ports. | |
3690 | ||
3691 | ** the fseek procedure now works on string ports, since it has been | |
c94577b4 | 3692 | redefined using seek. |
9e97c52d GH |
3693 | |
3694 | ** the setvbuf procedure now uses a default size if mode is _IOFBF and | |
3695 | size is not supplied. | |
3696 | ||
3697 | ** the newline procedure no longer flushes the port if it's not | |
3698 | line-buffered: previously it did if it was the current output port. | |
3699 | ||
3700 | ** open-pipe and close-pipe are no longer primitive procedures, but | |
3701 | an emulation can be obtained using `(use-modules (ice-9 popen))'. | |
3702 | ||
3703 | ** the freopen procedure has been removed. | |
3704 | ||
3705 | ** new procedure: drain-input PORT | |
3706 | Drains PORT's read buffers (including any pushed-back characters) | |
3707 | and returns the contents as a single string. | |
3708 | ||
67ad463a | 3709 | ** New function: map-in-order PROC LIST1 LIST2 ... |
d41b3904 MD |
3710 | Version of `map' which guarantees that the procedure is applied to the |
3711 | lists in serial order. | |
3712 | ||
67ad463a MD |
3713 | ** Renamed `serial-array-copy!' and `serial-array-map!' to |
3714 | `array-copy-in-order!' and `array-map-in-order!'. The old names are | |
3715 | now obsolete and will go away in release 1.5. | |
3716 | ||
cf7132b3 | 3717 | ** New syntax: collect BODY1 ... |
d41b3904 MD |
3718 | Version of `begin' which returns a list of the results of the body |
3719 | forms instead of the result of the last body form. In contrast to | |
cf7132b3 | 3720 | `begin', `collect' allows an empty body. |
d41b3904 | 3721 | |
e4eae9b1 MD |
3722 | ** New functions: read-history FILENAME, write-history FILENAME |
3723 | Read/write command line history from/to file. Returns #t on success | |
3724 | and #f if an error occured. | |
3725 | ||
d21ffe26 JB |
3726 | ** `ls' and `lls' in module (ice-9 ls) now handle no arguments. |
3727 | ||
3728 | These procedures return a list of definitions available in the specified | |
3729 | argument, a relative module reference. In the case of no argument, | |
3730 | `(current-module)' is now consulted for definitions to return, instead | |
3731 | of simply returning #f, the former behavior. | |
3732 | ||
f8c9d497 JB |
3733 | ** The #/ syntax for lists is no longer supported. |
3734 | ||
3735 | Earlier versions of Scheme accepted this syntax, but printed a | |
3736 | warning. | |
3737 | ||
3738 | ** Guile no longer consults the SCHEME_LOAD_PATH environment variable. | |
3739 | ||
3740 | Instead, you should set GUILE_LOAD_PATH to tell Guile where to find | |
3741 | modules. | |
3742 | ||
3ffc7a36 MD |
3743 | * Changes to the gh_ interface |
3744 | ||
3745 | ** gh_scm2doubles | |
3746 | ||
3747 | Now takes a second argument which is the result array. If this | |
3748 | pointer is NULL, a new array is malloced (the old behaviour). | |
3749 | ||
3750 | ** gh_chars2byvect, gh_shorts2svect, gh_floats2fvect, gh_scm2chars, | |
3751 | gh_scm2shorts, gh_scm2longs, gh_scm2floats | |
3752 | ||
3753 | New functions. | |
3754 | ||
3e8370c3 MD |
3755 | * Changes to the scm_ interface |
3756 | ||
ad91d6c3 MD |
3757 | ** Function: scm_make_named_hook (char* name, int n_args) |
3758 | ||
3759 | Creates a hook in the same way as make-hook above but also | |
3760 | binds a variable named NAME to it. | |
3761 | ||
3762 | This is the typical way of creating a hook from C code. | |
3763 | ||
ece41168 MD |
3764 | Currently, the variable is created in the "current" module. This |
3765 | might change when we get the new module system. | |
ad91d6c3 | 3766 | |
16a5a9a4 MD |
3767 | ** The smob interface |
3768 | ||
3769 | The interface for creating smobs has changed. For documentation, see | |
3770 | data-rep.info (made from guile-core/doc/data-rep.texi). | |
3771 | ||
3772 | *** Deprecated function: SCM scm_newsmob (scm_smobfuns *) | |
3773 | ||
3774 | >>> This function will be removed in 1.3.4. <<< | |
3775 | ||
3776 | It is replaced by: | |
3777 | ||
3778 | *** Function: SCM scm_make_smob_type (const char *name, scm_sizet size) | |
3779 | This function adds a new smob type, named NAME, with instance size | |
3780 | SIZE to the system. The return value is a tag that is used in | |
3781 | creating instances of the type. If SIZE is 0, then no memory will | |
3782 | be allocated when instances of the smob are created, and nothing | |
3783 | will be freed by the default free function. | |
6c0201ad | 3784 | |
16a5a9a4 MD |
3785 | *** Function: void scm_set_smob_mark (long tc, SCM (*mark) (SCM)) |
3786 | This function sets the smob marking procedure for the smob type | |
3787 | specified by the tag TC. TC is the tag returned by | |
3788 | `scm_make_smob_type'. | |
3789 | ||
3790 | *** Function: void scm_set_smob_free (long tc, SCM (*mark) (SCM)) | |
3791 | This function sets the smob freeing procedure for the smob type | |
3792 | specified by the tag TC. TC is the tag returned by | |
3793 | `scm_make_smob_type'. | |
3794 | ||
3795 | *** Function: void scm_set_smob_print (tc, print) | |
3796 | ||
3797 | - Function: void scm_set_smob_print (long tc, | |
3798 | scm_sizet (*print) (SCM, | |
3799 | SCM, | |
3800 | scm_print_state *)) | |
3801 | ||
3802 | This function sets the smob printing procedure for the smob type | |
3803 | specified by the tag TC. TC is the tag returned by | |
3804 | `scm_make_smob_type'. | |
3805 | ||
3806 | *** Function: void scm_set_smob_equalp (long tc, SCM (*equalp) (SCM, SCM)) | |
3807 | This function sets the smob equality-testing predicate for the | |
3808 | smob type specified by the tag TC. TC is the tag returned by | |
3809 | `scm_make_smob_type'. | |
3810 | ||
3811 | *** Macro: void SCM_NEWSMOB (SCM var, long tc, void *data) | |
3812 | Make VALUE contain a smob instance of the type with type code TC and | |
3813 | smob data DATA. VALUE must be previously declared as C type `SCM'. | |
3814 | ||
3815 | *** Macro: fn_returns SCM_RETURN_NEWSMOB (long tc, void *data) | |
3816 | This macro expands to a block of code that creates a smob instance | |
3817 | of the type with type code TC and smob data DATA, and returns that | |
3818 | `SCM' value. It should be the last piece of code in a block. | |
3819 | ||
9e97c52d GH |
3820 | ** The interfaces for using I/O ports and implementing port types |
3821 | (ptobs) have changed significantly. The new interface is based on | |
3822 | shared access to buffers and a new set of ptob procedures. | |
3823 | ||
16a5a9a4 MD |
3824 | *** scm_newptob has been removed |
3825 | ||
3826 | It is replaced by: | |
3827 | ||
3828 | *** Function: SCM scm_make_port_type (type_name, fill_buffer, write_flush) | |
3829 | ||
3830 | - Function: SCM scm_make_port_type (char *type_name, | |
3831 | int (*fill_buffer) (SCM port), | |
3832 | void (*write_flush) (SCM port)); | |
3833 | ||
3834 | Similarly to the new smob interface, there is a set of function | |
3835 | setters by which the user can customize the behaviour of his port | |
544e9093 | 3836 | type. See ports.h (scm_set_port_XXX). |
16a5a9a4 | 3837 | |
9e97c52d GH |
3838 | ** scm_strport_to_string: New function: creates a new string from |
3839 | a string port's buffer. | |
3840 | ||
3e8370c3 MD |
3841 | ** Plug in interface for random number generators |
3842 | The variable `scm_the_rng' in random.c contains a value and three | |
3843 | function pointers which together define the current random number | |
3844 | generator being used by the Scheme level interface and the random | |
3845 | number library functions. | |
3846 | ||
3847 | The user is free to replace the default generator with the generator | |
3848 | of his own choice. | |
3849 | ||
3850 | *** Variable: size_t scm_the_rng.rstate_size | |
3851 | The size of the random state type used by the current RNG | |
3852 | measured in chars. | |
3853 | ||
3854 | *** Function: unsigned long scm_the_rng.random_bits (scm_rstate *STATE) | |
3855 | Given the random STATE, return 32 random bits. | |
3856 | ||
3857 | *** Function: void scm_the_rng.init_rstate (scm_rstate *STATE, chars *S, int N) | |
3858 | Seed random state STATE using string S of length N. | |
3859 | ||
3860 | *** Function: scm_rstate *scm_the_rng.copy_rstate (scm_rstate *STATE) | |
3861 | Given random state STATE, return a malloced copy. | |
3862 | ||
3863 | ** Default RNG | |
3864 | The default RNG is the MWC (Multiply With Carry) random number | |
3865 | generator described by George Marsaglia at the Department of | |
3866 | Statistics and Supercomputer Computations Research Institute, The | |
3867 | Florida State University (http://stat.fsu.edu/~geo). | |
3868 | ||
3869 | It uses 64 bits, has a period of 4578426017172946943 (4.6e18), and | |
3870 | passes all tests in the DIEHARD test suite | |
3871 | (http://stat.fsu.edu/~geo/diehard.html). The generation of 32 bits | |
3872 | costs one multiply and one add on platforms which either supports long | |
3873 | longs (gcc does this on most systems) or have 64 bit longs. The cost | |
3874 | is four multiply on other systems but this can be optimized by writing | |
3875 | scm_i_uniform32 in assembler. | |
3876 | ||
3877 | These functions are provided through the scm_the_rng interface for use | |
3878 | by libguile and the application. | |
3879 | ||
3880 | *** Function: unsigned long scm_i_uniform32 (scm_i_rstate *STATE) | |
3881 | Given the random STATE, return 32 random bits. | |
3882 | Don't use this function directly. Instead go through the plugin | |
3883 | interface (see "Plug in interface" above). | |
3884 | ||
3885 | *** Function: void scm_i_init_rstate (scm_i_rstate *STATE, char *SEED, int N) | |
3886 | Initialize STATE using SEED of length N. | |
3887 | ||
3888 | *** Function: scm_i_rstate *scm_i_copy_rstate (scm_i_rstate *STATE) | |
3889 | Return a malloc:ed copy of STATE. This function can easily be re-used | |
3890 | in the interfaces to other RNGs. | |
3891 | ||
3892 | ** Random number library functions | |
3893 | These functions use the current RNG through the scm_the_rng interface. | |
3894 | It might be a good idea to use these functions from your C code so | |
3895 | that only one random generator is used by all code in your program. | |
3896 | ||
259529f2 | 3897 | The default random state is stored in: |
3e8370c3 MD |
3898 | |
3899 | *** Variable: SCM scm_var_random_state | |
3900 | Contains the vcell of the Scheme variable "*random-state*" which is | |
3901 | used as default state by all random number functions in the Scheme | |
3902 | level interface. | |
3903 | ||
3904 | Example: | |
3905 | ||
259529f2 | 3906 | double x = scm_c_uniform01 (SCM_RSTATE (SCM_CDR (scm_var_random_state))); |
3e8370c3 | 3907 | |
259529f2 MD |
3908 | *** Function: scm_rstate *scm_c_default_rstate (void) |
3909 | This is a convenience function which returns the value of | |
3910 | scm_var_random_state. An error message is generated if this value | |
3911 | isn't a random state. | |
3912 | ||
3913 | *** Function: scm_rstate *scm_c_make_rstate (char *SEED, int LENGTH) | |
3914 | Make a new random state from the string SEED of length LENGTH. | |
3915 | ||
3916 | It is generally not a good idea to use multiple random states in a | |
3917 | program. While subsequent random numbers generated from one random | |
3918 | state are guaranteed to be reasonably independent, there is no such | |
3919 | guarantee for numbers generated from different random states. | |
3920 | ||
3921 | *** Macro: unsigned long scm_c_uniform32 (scm_rstate *STATE) | |
3922 | Return 32 random bits. | |
3923 | ||
3924 | *** Function: double scm_c_uniform01 (scm_rstate *STATE) | |
3e8370c3 MD |
3925 | Return a sample from the uniform(0,1) distribution. |
3926 | ||
259529f2 | 3927 | *** Function: double scm_c_normal01 (scm_rstate *STATE) |
3e8370c3 MD |
3928 | Return a sample from the normal(0,1) distribution. |
3929 | ||
259529f2 | 3930 | *** Function: double scm_c_exp1 (scm_rstate *STATE) |
3e8370c3 MD |
3931 | Return a sample from the exp(1) distribution. |
3932 | ||
259529f2 MD |
3933 | *** Function: unsigned long scm_c_random (scm_rstate *STATE, unsigned long M) |
3934 | Return a sample from the discrete uniform(0,M) distribution. | |
3935 | ||
3936 | *** Function: SCM scm_c_random_bignum (scm_rstate *STATE, SCM M) | |
3e8370c3 | 3937 | Return a sample from the discrete uniform(0,M) distribution. |
259529f2 | 3938 | M must be a bignum object. The returned value may be an INUM. |
3e8370c3 | 3939 | |
9e97c52d | 3940 | |
f3227c7a | 3941 | \f |
d23bbf3e | 3942 | Changes in Guile 1.3 (released Monday, October 19, 1998): |
c484bf7f JB |
3943 | |
3944 | * Changes to the distribution | |
3945 | ||
e2d6569c JB |
3946 | ** We renamed the SCHEME_LOAD_PATH environment variable to GUILE_LOAD_PATH. |
3947 | To avoid conflicts, programs should name environment variables after | |
3948 | themselves, except when there's a common practice establishing some | |
3949 | other convention. | |
3950 | ||
3951 | For now, Guile supports both GUILE_LOAD_PATH and SCHEME_LOAD_PATH, | |
3952 | giving the former precedence, and printing a warning message if the | |
3953 | latter is set. Guile 1.4 will not recognize SCHEME_LOAD_PATH at all. | |
3954 | ||
3955 | ** The header files related to multi-byte characters have been removed. | |
3956 | They were: libguile/extchrs.h and libguile/mbstrings.h. Any C code | |
3957 | which referred to these explicitly will probably need to be rewritten, | |
3958 | since the support for the variant string types has been removed; see | |
3959 | below. | |
3960 | ||
3961 | ** The header files append.h and sequences.h have been removed. These | |
3962 | files implemented non-R4RS operations which would encourage | |
3963 | non-portable programming style and less easy-to-read code. | |
3a97e020 | 3964 | |
c484bf7f JB |
3965 | * Changes to the stand-alone interpreter |
3966 | ||
2e368582 | 3967 | ** New procedures have been added to implement a "batch mode": |
ec4ab4fd | 3968 | |
2e368582 | 3969 | *** Function: batch-mode? |
ec4ab4fd GH |
3970 | |
3971 | Returns a boolean indicating whether the interpreter is in batch | |
3972 | mode. | |
3973 | ||
2e368582 | 3974 | *** Function: set-batch-mode?! ARG |
ec4ab4fd GH |
3975 | |
3976 | If ARG is true, switches the interpreter to batch mode. The `#f' | |
3977 | case has not been implemented. | |
3978 | ||
2e368582 JB |
3979 | ** Guile now provides full command-line editing, when run interactively. |
3980 | To use this feature, you must have the readline library installed. | |
3981 | The Guile build process will notice it, and automatically include | |
3982 | support for it. | |
3983 | ||
3984 | The readline library is available via anonymous FTP from any GNU | |
3985 | mirror site; the canonical location is "ftp://prep.ai.mit.edu/pub/gnu". | |
3986 | ||
a5d6d578 MD |
3987 | ** the-last-stack is now a fluid. |
3988 | ||
c484bf7f JB |
3989 | * Changes to the procedure for linking libguile with your programs |
3990 | ||
71f20534 | 3991 | ** You can now use the `guile-config' utility to build programs that use Guile. |
2e368582 | 3992 | |
2adfe1c0 | 3993 | Guile now includes a command-line utility called `guile-config', which |
71f20534 JB |
3994 | can provide information about how to compile and link programs that |
3995 | use Guile. | |
3996 | ||
3997 | *** `guile-config compile' prints any C compiler flags needed to use Guile. | |
3998 | You should include this command's output on the command line you use | |
3999 | to compile C or C++ code that #includes the Guile header files. It's | |
4000 | usually just a `-I' flag to help the compiler find the Guile headers. | |
4001 | ||
4002 | ||
4003 | *** `guile-config link' prints any linker flags necessary to link with Guile. | |
8aa5c148 | 4004 | |
71f20534 | 4005 | This command writes to its standard output a list of flags which you |
8aa5c148 JB |
4006 | must pass to the linker to link your code against the Guile library. |
4007 | The flags include '-lguile' itself, any other libraries the Guile | |
4008 | library depends upon, and any `-L' flags needed to help the linker | |
4009 | find those libraries. | |
2e368582 JB |
4010 | |
4011 | For example, here is a Makefile rule that builds a program named 'foo' | |
4012 | from the object files ${FOO_OBJECTS}, and links them against Guile: | |
4013 | ||
4014 | foo: ${FOO_OBJECTS} | |
2adfe1c0 | 4015 | ${CC} ${CFLAGS} ${FOO_OBJECTS} `guile-config link` -o foo |
2e368582 | 4016 | |
e2d6569c JB |
4017 | Previous Guile releases recommended that you use autoconf to detect |
4018 | which of a predefined set of libraries were present on your system. | |
2adfe1c0 | 4019 | It is more robust to use `guile-config', since it records exactly which |
e2d6569c JB |
4020 | libraries the installed Guile library requires. |
4021 | ||
2adfe1c0 JB |
4022 | This was originally called `build-guile', but was renamed to |
4023 | `guile-config' before Guile 1.3 was released, to be consistent with | |
4024 | the analogous script for the GTK+ GUI toolkit, which is called | |
4025 | `gtk-config'. | |
4026 | ||
2e368582 | 4027 | |
8aa5c148 JB |
4028 | ** Use the GUILE_FLAGS macro in your configure.in file to find Guile. |
4029 | ||
4030 | If you are using the GNU autoconf package to configure your program, | |
4031 | you can use the GUILE_FLAGS autoconf macro to call `guile-config' | |
4032 | (described above) and gather the necessary values for use in your | |
4033 | Makefiles. | |
4034 | ||
4035 | The GUILE_FLAGS macro expands to configure script code which runs the | |
4036 | `guile-config' script, to find out where Guile's header files and | |
4037 | libraries are installed. It sets two variables, marked for | |
4038 | substitution, as by AC_SUBST. | |
4039 | ||
4040 | GUILE_CFLAGS --- flags to pass to a C or C++ compiler to build | |
4041 | code that uses Guile header files. This is almost always just a | |
4042 | -I flag. | |
4043 | ||
4044 | GUILE_LDFLAGS --- flags to pass to the linker to link a | |
4045 | program against Guile. This includes `-lguile' for the Guile | |
4046 | library itself, any libraries that Guile itself requires (like | |
4047 | -lqthreads), and so on. It may also include a -L flag to tell the | |
4048 | compiler where to find the libraries. | |
4049 | ||
4050 | GUILE_FLAGS is defined in the file guile.m4, in the top-level | |
4051 | directory of the Guile distribution. You can copy it into your | |
4052 | package's aclocal.m4 file, and then use it in your configure.in file. | |
4053 | ||
4054 | If you are using the `aclocal' program, distributed with GNU automake, | |
4055 | to maintain your aclocal.m4 file, the Guile installation process | |
4056 | installs guile.m4 where aclocal will find it. All you need to do is | |
4057 | use GUILE_FLAGS in your configure.in file, and then run `aclocal'; | |
4058 | this will copy the definition of GUILE_FLAGS into your aclocal.m4 | |
4059 | file. | |
4060 | ||
4061 | ||
c484bf7f | 4062 | * Changes to Scheme functions and syntax |
7ad3c1e7 | 4063 | |
02755d59 | 4064 | ** Multi-byte strings have been removed, as have multi-byte and wide |
e2d6569c JB |
4065 | ports. We felt that these were the wrong approach to |
4066 | internationalization support. | |
02755d59 | 4067 | |
2e368582 JB |
4068 | ** New function: readline [PROMPT] |
4069 | Read a line from the terminal, and allow the user to edit it, | |
4070 | prompting with PROMPT. READLINE provides a large set of Emacs-like | |
4071 | editing commands, lets the user recall previously typed lines, and | |
4072 | works on almost every kind of terminal, including dumb terminals. | |
4073 | ||
4074 | READLINE assumes that the cursor is at the beginning of the line when | |
4075 | it is invoked. Thus, you can't print a prompt yourself, and then call | |
4076 | READLINE; you need to package up your prompt as a string, pass it to | |
4077 | the function, and let READLINE print the prompt itself. This is | |
4078 | because READLINE needs to know the prompt's screen width. | |
4079 | ||
8cd57bd0 JB |
4080 | For Guile to provide this function, you must have the readline |
4081 | library, version 2.1 or later, installed on your system. Readline is | |
4082 | available via anonymous FTP from prep.ai.mit.edu in pub/gnu, or from | |
4083 | any GNU mirror site. | |
2e368582 JB |
4084 | |
4085 | See also ADD-HISTORY function. | |
4086 | ||
4087 | ** New function: add-history STRING | |
4088 | Add STRING as the most recent line in the history used by the READLINE | |
4089 | command. READLINE does not add lines to the history itself; you must | |
4090 | call ADD-HISTORY to make previous input available to the user. | |
4091 | ||
8cd57bd0 JB |
4092 | ** The behavior of the read-line function has changed. |
4093 | ||
4094 | This function now uses standard C library functions to read the line, | |
4095 | for speed. This means that it doesn not respect the value of | |
4096 | scm-line-incrementors; it assumes that lines are delimited with | |
4097 | #\newline. | |
4098 | ||
4099 | (Note that this is read-line, the function that reads a line of text | |
4100 | from a port, not readline, the function that reads a line from a | |
4101 | terminal, providing full editing capabilities.) | |
4102 | ||
1a0106ef JB |
4103 | ** New module (ice-9 getopt-gnu-style): Parse command-line arguments. |
4104 | ||
4105 | This module provides some simple argument parsing. It exports one | |
4106 | function: | |
4107 | ||
4108 | Function: getopt-gnu-style ARG-LS | |
4109 | Parse a list of program arguments into an alist of option | |
4110 | descriptions. | |
4111 | ||
4112 | Each item in the list of program arguments is examined to see if | |
4113 | it meets the syntax of a GNU long-named option. An argument like | |
4114 | `--MUMBLE' produces an element of the form (MUMBLE . #t) in the | |
4115 | returned alist, where MUMBLE is a keyword object with the same | |
4116 | name as the argument. An argument like `--MUMBLE=FROB' produces | |
4117 | an element of the form (MUMBLE . FROB), where FROB is a string. | |
4118 | ||
4119 | As a special case, the returned alist also contains a pair whose | |
4120 | car is the symbol `rest'. The cdr of this pair is a list | |
4121 | containing all the items in the argument list that are not options | |
4122 | of the form mentioned above. | |
4123 | ||
4124 | The argument `--' is treated specially: all items in the argument | |
4125 | list appearing after such an argument are not examined, and are | |
4126 | returned in the special `rest' list. | |
4127 | ||
4128 | This function does not parse normal single-character switches. | |
4129 | You will need to parse them out of the `rest' list yourself. | |
4130 | ||
8cd57bd0 JB |
4131 | ** The read syntax for byte vectors and short vectors has changed. |
4132 | ||
4133 | Instead of #bytes(...), write #y(...). | |
4134 | ||
4135 | Instead of #short(...), write #h(...). | |
4136 | ||
4137 | This may seem nutty, but, like the other uniform vectors, byte vectors | |
4138 | and short vectors want to have the same print and read syntax (and, | |
4139 | more basic, want to have read syntax!). Changing the read syntax to | |
4140 | use multiple characters after the hash sign breaks with the | |
4141 | conventions used in R5RS and the conventions used for the other | |
4142 | uniform vectors. It also introduces complexity in the current reader, | |
4143 | both on the C and Scheme levels. (The Right solution is probably to | |
4144 | change the syntax and prototypes for uniform vectors entirely.) | |
4145 | ||
4146 | ||
4147 | ** The new module (ice-9 session) provides useful interactive functions. | |
4148 | ||
4149 | *** New procedure: (apropos REGEXP OPTION ...) | |
4150 | ||
4151 | Display a list of top-level variables whose names match REGEXP, and | |
4152 | the modules they are imported from. Each OPTION should be one of the | |
4153 | following symbols: | |
4154 | ||
4155 | value --- Show the value of each matching variable. | |
4156 | shadow --- Show bindings shadowed by subsequently imported modules. | |
4157 | full --- Same as both `shadow' and `value'. | |
4158 | ||
4159 | For example: | |
4160 | ||
4161 | guile> (apropos "trace" 'full) | |
4162 | debug: trace #<procedure trace args> | |
4163 | debug: untrace #<procedure untrace args> | |
4164 | the-scm-module: display-backtrace #<compiled-closure #<primitive-procedure gsubr-apply>> | |
4165 | the-scm-module: before-backtrace-hook () | |
4166 | the-scm-module: backtrace #<primitive-procedure backtrace> | |
4167 | the-scm-module: after-backtrace-hook () | |
4168 | the-scm-module: has-shown-backtrace-hint? #f | |
6c0201ad | 4169 | guile> |
8cd57bd0 JB |
4170 | |
4171 | ** There are new functions and syntax for working with macros. | |
4172 | ||
4173 | Guile implements macros as a special object type. Any variable whose | |
4174 | top-level binding is a macro object acts as a macro. The macro object | |
4175 | specifies how the expression should be transformed before evaluation. | |
4176 | ||
4177 | *** Macro objects now print in a reasonable way, resembling procedures. | |
4178 | ||
4179 | *** New function: (macro? OBJ) | |
4180 | True iff OBJ is a macro object. | |
4181 | ||
4182 | *** New function: (primitive-macro? OBJ) | |
4183 | Like (macro? OBJ), but true only if OBJ is one of the Guile primitive | |
4184 | macro transformers, implemented in eval.c rather than Scheme code. | |
4185 | ||
dbdd0c16 JB |
4186 | Why do we have this function? |
4187 | - For symmetry with procedure? and primitive-procedure?, | |
4188 | - to allow custom print procedures to tell whether a macro is | |
4189 | primitive, and display it differently, and | |
4190 | - to allow compilers and user-written evaluators to distinguish | |
4191 | builtin special forms from user-defined ones, which could be | |
4192 | compiled. | |
4193 | ||
8cd57bd0 JB |
4194 | *** New function: (macro-type OBJ) |
4195 | Return a value indicating what kind of macro OBJ is. Possible return | |
4196 | values are: | |
4197 | ||
4198 | The symbol `syntax' --- a macro created by procedure->syntax. | |
4199 | The symbol `macro' --- a macro created by procedure->macro. | |
4200 | The symbol `macro!' --- a macro created by procedure->memoizing-macro. | |
6c0201ad | 4201 | The boolean #f --- if OBJ is not a macro object. |
8cd57bd0 JB |
4202 | |
4203 | *** New function: (macro-name MACRO) | |
4204 | Return the name of the macro object MACRO's procedure, as returned by | |
4205 | procedure-name. | |
4206 | ||
4207 | *** New function: (macro-transformer MACRO) | |
4208 | Return the transformer procedure for MACRO. | |
4209 | ||
4210 | *** New syntax: (use-syntax MODULE ... TRANSFORMER) | |
4211 | ||
4212 | Specify a new macro expander to use in the current module. Each | |
4213 | MODULE is a module name, with the same meaning as in the `use-modules' | |
4214 | form; each named module's exported bindings are added to the current | |
4215 | top-level environment. TRANSFORMER is an expression evaluated in the | |
4216 | resulting environment which must yield a procedure to use as the | |
4217 | module's eval transformer: every expression evaluated in this module | |
4218 | is passed to this function, and the result passed to the Guile | |
6c0201ad | 4219 | interpreter. |
8cd57bd0 JB |
4220 | |
4221 | *** macro-eval! is removed. Use local-eval instead. | |
29521173 | 4222 | |
8d9dcb3c MV |
4223 | ** Some magic has been added to the printer to better handle user |
4224 | written printing routines (like record printers, closure printers). | |
4225 | ||
4226 | The problem is that these user written routines must have access to | |
7fbd77df | 4227 | the current `print-state' to be able to handle fancy things like |
8d9dcb3c MV |
4228 | detection of circular references. These print-states have to be |
4229 | passed to the builtin printing routines (display, write, etc) to | |
4230 | properly continue the print chain. | |
4231 | ||
4232 | We didn't want to change all existing print code so that it | |
8cd57bd0 | 4233 | explicitly passes thru a print state in addition to a port. Instead, |
8d9dcb3c MV |
4234 | we extented the possible values that the builtin printing routines |
4235 | accept as a `port'. In addition to a normal port, they now also take | |
4236 | a pair of a normal port and a print-state. Printing will go to the | |
4237 | port and the print-state will be used to control the detection of | |
4238 | circular references, etc. If the builtin function does not care for a | |
4239 | print-state, it is simply ignored. | |
4240 | ||
4241 | User written callbacks are now called with such a pair as their | |
4242 | `port', but because every function now accepts this pair as a PORT | |
4243 | argument, you don't have to worry about that. In fact, it is probably | |
4244 | safest to not check for these pairs. | |
4245 | ||
4246 | However, it is sometimes necessary to continue a print chain on a | |
4247 | different port, for example to get a intermediate string | |
4248 | representation of the printed value, mangle that string somehow, and | |
4249 | then to finally print the mangled string. Use the new function | |
4250 | ||
4251 | inherit-print-state OLD-PORT NEW-PORT | |
4252 | ||
4253 | for this. It constructs a new `port' that prints to NEW-PORT but | |
4254 | inherits the print-state of OLD-PORT. | |
4255 | ||
ef1ea498 MD |
4256 | ** struct-vtable-offset renamed to vtable-offset-user |
4257 | ||
4258 | ** New constants: vtable-index-layout, vtable-index-vtable, vtable-index-printer | |
4259 | ||
e478dffa MD |
4260 | ** There is now a third optional argument to make-vtable-vtable |
4261 | (and fourth to make-struct) when constructing new types (vtables). | |
4262 | This argument initializes field vtable-index-printer of the vtable. | |
ef1ea498 | 4263 | |
4851dc57 MV |
4264 | ** The detection of circular references has been extended to structs. |
4265 | That is, a structure that -- in the process of being printed -- prints | |
4266 | itself does not lead to infinite recursion. | |
4267 | ||
4268 | ** There is now some basic support for fluids. Please read | |
4269 | "libguile/fluid.h" to find out more. It is accessible from Scheme with | |
4270 | the following functions and macros: | |
4271 | ||
9c3fb66f MV |
4272 | Function: make-fluid |
4273 | ||
4274 | Create a new fluid object. Fluids are not special variables or | |
4275 | some other extension to the semantics of Scheme, but rather | |
4276 | ordinary Scheme objects. You can store them into variables (that | |
4277 | are still lexically scoped, of course) or into any other place you | |
4278 | like. Every fluid has a initial value of `#f'. | |
04c76b58 | 4279 | |
9c3fb66f | 4280 | Function: fluid? OBJ |
04c76b58 | 4281 | |
9c3fb66f | 4282 | Test whether OBJ is a fluid. |
04c76b58 | 4283 | |
9c3fb66f MV |
4284 | Function: fluid-ref FLUID |
4285 | Function: fluid-set! FLUID VAL | |
04c76b58 MV |
4286 | |
4287 | Access/modify the fluid FLUID. Modifications are only visible | |
4288 | within the current dynamic root (that includes threads). | |
4289 | ||
9c3fb66f MV |
4290 | Function: with-fluids* FLUIDS VALUES THUNK |
4291 | ||
4292 | FLUIDS is a list of fluids and VALUES a corresponding list of | |
4293 | values for these fluids. Before THUNK gets called the values are | |
6c0201ad | 4294 | installed in the fluids and the old values of the fluids are |
9c3fb66f MV |
4295 | saved in the VALUES list. When the flow of control leaves THUNK |
4296 | or reenters it, the values get swapped again. You might think of | |
4297 | this as a `safe-fluid-excursion'. Note that the VALUES list is | |
4298 | modified by `with-fluids*'. | |
4299 | ||
4300 | Macro: with-fluids ((FLUID VALUE) ...) FORM ... | |
4301 | ||
4302 | The same as `with-fluids*' but with a different syntax. It looks | |
4303 | just like `let', but both FLUID and VALUE are evaluated. Remember, | |
4304 | fluids are not special variables but ordinary objects. FLUID | |
4305 | should evaluate to a fluid. | |
04c76b58 | 4306 | |
e2d6569c | 4307 | ** Changes to system call interfaces: |
64d01d13 | 4308 | |
e2d6569c | 4309 | *** close-port, close-input-port and close-output-port now return a |
64d01d13 GH |
4310 | boolean instead of an `unspecified' object. #t means that the port |
4311 | was successfully closed, while #f means it was already closed. It is | |
4312 | also now possible for these procedures to raise an exception if an | |
4313 | error occurs (some errors from write can be delayed until close.) | |
4314 | ||
e2d6569c | 4315 | *** the first argument to chmod, fcntl, ftell and fseek can now be a |
6afcd3b2 GH |
4316 | file descriptor. |
4317 | ||
e2d6569c | 4318 | *** the third argument to fcntl is now optional. |
6afcd3b2 | 4319 | |
e2d6569c | 4320 | *** the first argument to chown can now be a file descriptor or a port. |
6afcd3b2 | 4321 | |
e2d6569c | 4322 | *** the argument to stat can now be a port. |
6afcd3b2 | 4323 | |
e2d6569c | 4324 | *** The following new procedures have been added (most use scsh |
64d01d13 GH |
4325 | interfaces): |
4326 | ||
e2d6569c | 4327 | *** procedure: close PORT/FD |
ec4ab4fd GH |
4328 | Similar to close-port (*note close-port: Closing Ports.), but also |
4329 | works on file descriptors. A side effect of closing a file | |
4330 | descriptor is that any ports using that file descriptor are moved | |
4331 | to a different file descriptor and have their revealed counts set | |
4332 | to zero. | |
4333 | ||
e2d6569c | 4334 | *** procedure: port->fdes PORT |
ec4ab4fd GH |
4335 | Returns the integer file descriptor underlying PORT. As a side |
4336 | effect the revealed count of PORT is incremented. | |
4337 | ||
e2d6569c | 4338 | *** procedure: fdes->ports FDES |
ec4ab4fd GH |
4339 | Returns a list of existing ports which have FDES as an underlying |
4340 | file descriptor, without changing their revealed counts. | |
4341 | ||
e2d6569c | 4342 | *** procedure: fdes->inport FDES |
ec4ab4fd GH |
4343 | Returns an existing input port which has FDES as its underlying |
4344 | file descriptor, if one exists, and increments its revealed count. | |
4345 | Otherwise, returns a new input port with a revealed count of 1. | |
4346 | ||
e2d6569c | 4347 | *** procedure: fdes->outport FDES |
ec4ab4fd GH |
4348 | Returns an existing output port which has FDES as its underlying |
4349 | file descriptor, if one exists, and increments its revealed count. | |
4350 | Otherwise, returns a new output port with a revealed count of 1. | |
4351 | ||
4352 | The next group of procedures perform a `dup2' system call, if NEWFD | |
4353 | (an integer) is supplied, otherwise a `dup'. The file descriptor to be | |
4354 | duplicated can be supplied as an integer or contained in a port. The | |
64d01d13 GH |
4355 | type of value returned varies depending on which procedure is used. |
4356 | ||
ec4ab4fd GH |
4357 | All procedures also have the side effect when performing `dup2' that |
4358 | any ports using NEWFD are moved to a different file descriptor and have | |
64d01d13 GH |
4359 | their revealed counts set to zero. |
4360 | ||
e2d6569c | 4361 | *** procedure: dup->fdes PORT/FD [NEWFD] |
ec4ab4fd | 4362 | Returns an integer file descriptor. |
64d01d13 | 4363 | |
e2d6569c | 4364 | *** procedure: dup->inport PORT/FD [NEWFD] |
ec4ab4fd | 4365 | Returns a new input port using the new file descriptor. |
64d01d13 | 4366 | |
e2d6569c | 4367 | *** procedure: dup->outport PORT/FD [NEWFD] |
ec4ab4fd | 4368 | Returns a new output port using the new file descriptor. |
64d01d13 | 4369 | |
e2d6569c | 4370 | *** procedure: dup PORT/FD [NEWFD] |
ec4ab4fd GH |
4371 | Returns a new port if PORT/FD is a port, with the same mode as the |
4372 | supplied port, otherwise returns an integer file descriptor. | |
64d01d13 | 4373 | |
e2d6569c | 4374 | *** procedure: dup->port PORT/FD MODE [NEWFD] |
ec4ab4fd GH |
4375 | Returns a new port using the new file descriptor. MODE supplies a |
4376 | mode string for the port (*note open-file: File Ports.). | |
64d01d13 | 4377 | |
e2d6569c | 4378 | *** procedure: setenv NAME VALUE |
ec4ab4fd GH |
4379 | Modifies the environment of the current process, which is also the |
4380 | default environment inherited by child processes. | |
64d01d13 | 4381 | |
ec4ab4fd GH |
4382 | If VALUE is `#f', then NAME is removed from the environment. |
4383 | Otherwise, the string NAME=VALUE is added to the environment, | |
4384 | replacing any existing string with name matching NAME. | |
64d01d13 | 4385 | |
ec4ab4fd | 4386 | The return value is unspecified. |
956055a9 | 4387 | |
e2d6569c | 4388 | *** procedure: truncate-file OBJ SIZE |
6afcd3b2 GH |
4389 | Truncates the file referred to by OBJ to at most SIZE bytes. OBJ |
4390 | can be a string containing a file name or an integer file | |
4391 | descriptor or port open for output on the file. The underlying | |
4392 | system calls are `truncate' and `ftruncate'. | |
4393 | ||
4394 | The return value is unspecified. | |
4395 | ||
e2d6569c | 4396 | *** procedure: setvbuf PORT MODE [SIZE] |
7a6f1ffa GH |
4397 | Set the buffering mode for PORT. MODE can be: |
4398 | `_IONBF' | |
4399 | non-buffered | |
4400 | ||
4401 | `_IOLBF' | |
4402 | line buffered | |
4403 | ||
4404 | `_IOFBF' | |
4405 | block buffered, using a newly allocated buffer of SIZE bytes. | |
4406 | However if SIZE is zero or unspecified, the port will be made | |
4407 | non-buffered. | |
4408 | ||
4409 | This procedure should not be used after I/O has been performed with | |
4410 | the port. | |
4411 | ||
4412 | Ports are usually block buffered by default, with a default buffer | |
4413 | size. Procedures e.g., *Note open-file: File Ports, which accept a | |
4414 | mode string allow `0' to be added to request an unbuffered port. | |
4415 | ||
e2d6569c | 4416 | *** procedure: fsync PORT/FD |
6afcd3b2 GH |
4417 | Copies any unwritten data for the specified output file descriptor |
4418 | to disk. If PORT/FD is a port, its buffer is flushed before the | |
4419 | underlying file descriptor is fsync'd. The return value is | |
4420 | unspecified. | |
4421 | ||
e2d6569c | 4422 | *** procedure: open-fdes PATH FLAGS [MODES] |
6afcd3b2 GH |
4423 | Similar to `open' but returns a file descriptor instead of a port. |
4424 | ||
e2d6569c | 4425 | *** procedure: execle PATH ENV [ARG] ... |
6afcd3b2 GH |
4426 | Similar to `execl', but the environment of the new process is |
4427 | specified by ENV, which must be a list of strings as returned by | |
4428 | the `environ' procedure. | |
4429 | ||
4430 | This procedure is currently implemented using the `execve' system | |
4431 | call, but we call it `execle' because of its Scheme calling | |
4432 | interface. | |
4433 | ||
e2d6569c | 4434 | *** procedure: strerror ERRNO |
ec4ab4fd GH |
4435 | Returns the Unix error message corresponding to ERRNO, an integer. |
4436 | ||
e2d6569c | 4437 | *** procedure: primitive-exit [STATUS] |
6afcd3b2 GH |
4438 | Terminate the current process without unwinding the Scheme stack. |
4439 | This is would typically be useful after a fork. The exit status | |
4440 | is STATUS if supplied, otherwise zero. | |
4441 | ||
e2d6569c | 4442 | *** procedure: times |
6afcd3b2 GH |
4443 | Returns an object with information about real and processor time. |
4444 | The following procedures accept such an object as an argument and | |
4445 | return a selected component: | |
4446 | ||
4447 | `tms:clock' | |
4448 | The current real time, expressed as time units relative to an | |
4449 | arbitrary base. | |
4450 | ||
4451 | `tms:utime' | |
4452 | The CPU time units used by the calling process. | |
4453 | ||
4454 | `tms:stime' | |
4455 | The CPU time units used by the system on behalf of the | |
4456 | calling process. | |
4457 | ||
4458 | `tms:cutime' | |
4459 | The CPU time units used by terminated child processes of the | |
4460 | calling process, whose status has been collected (e.g., using | |
4461 | `waitpid'). | |
4462 | ||
4463 | `tms:cstime' | |
4464 | Similarly, the CPU times units used by the system on behalf of | |
4465 | terminated child processes. | |
7ad3c1e7 | 4466 | |
e2d6569c JB |
4467 | ** Removed: list-length |
4468 | ** Removed: list-append, list-append! | |
4469 | ** Removed: list-reverse, list-reverse! | |
4470 | ||
4471 | ** array-map renamed to array-map! | |
4472 | ||
4473 | ** serial-array-map renamed to serial-array-map! | |
4474 | ||
660f41fa MD |
4475 | ** catch doesn't take #f as first argument any longer |
4476 | ||
4477 | Previously, it was possible to pass #f instead of a key to `catch'. | |
4478 | That would cause `catch' to pass a jump buffer object to the procedure | |
4479 | passed as second argument. The procedure could then use this jump | |
4480 | buffer objekt as an argument to throw. | |
4481 | ||
4482 | This mechanism has been removed since its utility doesn't motivate the | |
4483 | extra complexity it introduces. | |
4484 | ||
332d00f6 JB |
4485 | ** The `#/' notation for lists now provokes a warning message from Guile. |
4486 | This syntax will be removed from Guile in the near future. | |
4487 | ||
4488 | To disable the warning message, set the GUILE_HUSH environment | |
4489 | variable to any non-empty value. | |
4490 | ||
8cd57bd0 JB |
4491 | ** The newline character now prints as `#\newline', following the |
4492 | normal Scheme notation, not `#\nl'. | |
4493 | ||
c484bf7f JB |
4494 | * Changes to the gh_ interface |
4495 | ||
8986901b JB |
4496 | ** The gh_enter function now takes care of loading the Guile startup files. |
4497 | gh_enter works by calling scm_boot_guile; see the remarks below. | |
4498 | ||
5424b4f7 MD |
4499 | ** Function: void gh_write (SCM x) |
4500 | ||
4501 | Write the printed representation of the scheme object x to the current | |
4502 | output port. Corresponds to the scheme level `write'. | |
4503 | ||
3a97e020 MD |
4504 | ** gh_list_length renamed to gh_length. |
4505 | ||
8d6787b6 MG |
4506 | ** vector handling routines |
4507 | ||
4508 | Several major changes. In particular, gh_vector() now resembles | |
4509 | (vector ...) (with a caveat -- see manual), and gh_make_vector() now | |
956328d2 MG |
4510 | exists and behaves like (make-vector ...). gh_vset() and gh_vref() |
4511 | have been renamed gh_vector_set_x() and gh_vector_ref(). Some missing | |
8d6787b6 MG |
4512 | vector-related gh_ functions have been implemented. |
4513 | ||
7fee59bd MG |
4514 | ** pair and list routines |
4515 | ||
4516 | Implemented several of the R4RS pair and list functions that were | |
4517 | missing. | |
4518 | ||
171422a9 MD |
4519 | ** gh_scm2doubles, gh_doubles2scm, gh_doubles2dvect |
4520 | ||
4521 | New function. Converts double arrays back and forth between Scheme | |
4522 | and C. | |
4523 | ||
c484bf7f JB |
4524 | * Changes to the scm_ interface |
4525 | ||
8986901b JB |
4526 | ** The function scm_boot_guile now takes care of loading the startup files. |
4527 | ||
4528 | Guile's primary initialization function, scm_boot_guile, now takes | |
4529 | care of loading `boot-9.scm', in the `ice-9' module, to initialize | |
4530 | Guile, define the module system, and put together some standard | |
4531 | bindings. It also loads `init.scm', which is intended to hold | |
4532 | site-specific initialization code. | |
4533 | ||
4534 | Since Guile cannot operate properly until boot-9.scm is loaded, there | |
4535 | is no reason to separate loading boot-9.scm from Guile's other | |
4536 | initialization processes. | |
4537 | ||
4538 | This job used to be done by scm_compile_shell_switches, which didn't | |
4539 | make much sense; in particular, it meant that people using Guile for | |
4540 | non-shell-like applications had to jump through hoops to get Guile | |
4541 | initialized properly. | |
4542 | ||
4543 | ** The function scm_compile_shell_switches no longer loads the startup files. | |
4544 | Now, Guile always loads the startup files, whenever it is initialized; | |
4545 | see the notes above for scm_boot_guile and scm_load_startup_files. | |
4546 | ||
4547 | ** Function: scm_load_startup_files | |
4548 | This new function takes care of loading Guile's initialization file | |
4549 | (`boot-9.scm'), and the site initialization file, `init.scm'. Since | |
4550 | this is always called by the Guile initialization process, it's | |
4551 | probably not too useful to call this yourself, but it's there anyway. | |
4552 | ||
87148d9e JB |
4553 | ** The semantics of smob marking have changed slightly. |
4554 | ||
4555 | The smob marking function (the `mark' member of the scm_smobfuns | |
4556 | structure) is no longer responsible for setting the mark bit on the | |
4557 | smob. The generic smob handling code in the garbage collector will | |
4558 | set this bit. The mark function need only ensure that any other | |
4559 | objects the smob refers to get marked. | |
4560 | ||
4561 | Note that this change means that the smob's GC8MARK bit is typically | |
4562 | already set upon entry to the mark function. Thus, marking functions | |
4563 | which look like this: | |
4564 | ||
4565 | { | |
4566 | if (SCM_GC8MARKP (ptr)) | |
4567 | return SCM_BOOL_F; | |
4568 | SCM_SETGC8MARK (ptr); | |
4569 | ... mark objects to which the smob refers ... | |
4570 | } | |
4571 | ||
4572 | are now incorrect, since they will return early, and fail to mark any | |
4573 | other objects the smob refers to. Some code in the Guile library used | |
4574 | to work this way. | |
4575 | ||
1cf84ea5 JB |
4576 | ** The semantics of the I/O port functions in scm_ptobfuns have changed. |
4577 | ||
4578 | If you have implemented your own I/O port type, by writing the | |
4579 | functions required by the scm_ptobfuns and then calling scm_newptob, | |
4580 | you will need to change your functions slightly. | |
4581 | ||
4582 | The functions in a scm_ptobfuns structure now expect the port itself | |
4583 | as their argument; they used to expect the `stream' member of the | |
4584 | port's scm_port_table structure. This allows functions in an | |
4585 | scm_ptobfuns structure to easily access the port's cell (and any flags | |
4586 | it its CAR), and the port's scm_port_table structure. | |
4587 | ||
4588 | Guile now passes the I/O port itself as the `port' argument in the | |
4589 | following scm_ptobfuns functions: | |
4590 | ||
4591 | int (*free) (SCM port); | |
4592 | int (*fputc) (int, SCM port); | |
4593 | int (*fputs) (char *, SCM port); | |
4594 | scm_sizet (*fwrite) SCM_P ((char *ptr, | |
4595 | scm_sizet size, | |
4596 | scm_sizet nitems, | |
4597 | SCM port)); | |
4598 | int (*fflush) (SCM port); | |
4599 | int (*fgetc) (SCM port); | |
4600 | int (*fclose) (SCM port); | |
4601 | ||
4602 | The interfaces to the `mark', `print', `equalp', and `fgets' methods | |
4603 | are unchanged. | |
4604 | ||
4605 | If you have existing code which defines its own port types, it is easy | |
4606 | to convert your code to the new interface; simply apply SCM_STREAM to | |
4607 | the port argument to yield the value you code used to expect. | |
4608 | ||
4609 | Note that since both the port and the stream have the same type in the | |
4610 | C code --- they are both SCM values --- the C compiler will not remind | |
4611 | you if you forget to update your scm_ptobfuns functions. | |
4612 | ||
4613 | ||
933a7411 MD |
4614 | ** Function: int scm_internal_select (int fds, |
4615 | SELECT_TYPE *rfds, | |
4616 | SELECT_TYPE *wfds, | |
4617 | SELECT_TYPE *efds, | |
4618 | struct timeval *timeout); | |
4619 | ||
4620 | This is a replacement for the `select' function provided by the OS. | |
4621 | It enables I/O blocking and sleeping to happen for one cooperative | |
4622 | thread without blocking other threads. It also avoids busy-loops in | |
4623 | these situations. It is intended that all I/O blocking and sleeping | |
4624 | will finally go through this function. Currently, this function is | |
4625 | only available on systems providing `gettimeofday' and `select'. | |
4626 | ||
5424b4f7 MD |
4627 | ** Function: SCM scm_internal_stack_catch (SCM tag, |
4628 | scm_catch_body_t body, | |
4629 | void *body_data, | |
4630 | scm_catch_handler_t handler, | |
4631 | void *handler_data) | |
4632 | ||
4633 | A new sibling to the other two C level `catch' functions | |
4634 | scm_internal_catch and scm_internal_lazy_catch. Use it if you want | |
4635 | the stack to be saved automatically into the variable `the-last-stack' | |
4636 | (scm_the_last_stack_var) on error. This is necessary if you want to | |
4637 | use advanced error reporting, such as calling scm_display_error and | |
4638 | scm_display_backtrace. (They both take a stack object as argument.) | |
4639 | ||
df366c26 MD |
4640 | ** Function: SCM scm_spawn_thread (scm_catch_body_t body, |
4641 | void *body_data, | |
4642 | scm_catch_handler_t handler, | |
4643 | void *handler_data) | |
4644 | ||
4645 | Spawns a new thread. It does a job similar to | |
4646 | scm_call_with_new_thread but takes arguments more suitable when | |
4647 | spawning threads from application C code. | |
4648 | ||
88482b31 MD |
4649 | ** The hook scm_error_callback has been removed. It was originally |
4650 | intended as a way for the user to install his own error handler. But | |
4651 | that method works badly since it intervenes between throw and catch, | |
4652 | thereby changing the semantics of expressions like (catch #t ...). | |
4653 | The correct way to do it is to use one of the C level catch functions | |
4654 | in throw.c: scm_internal_catch/lazy_catch/stack_catch. | |
4655 | ||
3a97e020 MD |
4656 | ** Removed functions: |
4657 | ||
4658 | scm_obj_length, scm_list_length, scm_list_append, scm_list_append_x, | |
4659 | scm_list_reverse, scm_list_reverse_x | |
4660 | ||
4661 | ** New macros: SCM_LISTn where n is one of the integers 0-9. | |
4662 | ||
4663 | These can be used for pretty list creation from C. The idea is taken | |
4664 | from Erick Gallesio's STk. | |
4665 | ||
298aa6e3 MD |
4666 | ** scm_array_map renamed to scm_array_map_x |
4667 | ||
527da704 MD |
4668 | ** mbstrings are now removed |
4669 | ||
4670 | This means that the type codes scm_tc7_mb_string and | |
4671 | scm_tc7_mb_substring has been removed. | |
4672 | ||
8cd57bd0 JB |
4673 | ** scm_gen_putc, scm_gen_puts, scm_gen_write, and scm_gen_getc have changed. |
4674 | ||
4675 | Since we no longer support multi-byte strings, these I/O functions | |
4676 | have been simplified, and renamed. Here are their old names, and | |
4677 | their new names and arguments: | |
4678 | ||
4679 | scm_gen_putc -> void scm_putc (int c, SCM port); | |
4680 | scm_gen_puts -> void scm_puts (char *s, SCM port); | |
4681 | scm_gen_write -> void scm_lfwrite (char *ptr, scm_sizet size, SCM port); | |
4682 | scm_gen_getc -> void scm_getc (SCM port); | |
4683 | ||
4684 | ||
527da704 MD |
4685 | ** The macros SCM_TYP7D and SCM_TYP7SD has been removed. |
4686 | ||
4687 | ** The macro SCM_TYP7S has taken the role of the old SCM_TYP7D | |
4688 | ||
4689 | SCM_TYP7S now masks away the bit which distinguishes substrings from | |
4690 | strings. | |
4691 | ||
660f41fa MD |
4692 | ** scm_catch_body_t: Backward incompatible change! |
4693 | ||
4694 | Body functions to scm_internal_catch and friends do not any longer | |
4695 | take a second argument. This is because it is no longer possible to | |
4696 | pass a #f arg to catch. | |
4697 | ||
a8e05009 JB |
4698 | ** Calls to scm_protect_object and scm_unprotect now nest properly. |
4699 | ||
4700 | The function scm_protect_object protects its argument from being freed | |
4701 | by the garbage collector. scm_unprotect_object removes that | |
4702 | protection. | |
4703 | ||
4704 | These functions now nest properly. That is, for every object O, there | |
4705 | is a counter which scm_protect_object(O) increments and | |
4706 | scm_unprotect_object(O) decrements, if the counter is greater than | |
4707 | zero. Every object's counter is zero when it is first created. If an | |
4708 | object's counter is greater than zero, the garbage collector will not | |
4709 | reclaim its storage. | |
4710 | ||
4711 | This allows you to use scm_protect_object in your code without | |
4712 | worrying that some other function you call will call | |
4713 | scm_unprotect_object, and allow it to be freed. Assuming that the | |
4714 | functions you call are well-behaved, and unprotect only those objects | |
4715 | they protect, you can follow the same rule and have confidence that | |
4716 | objects will be freed only at appropriate times. | |
4717 | ||
c484bf7f JB |
4718 | \f |
4719 | Changes in Guile 1.2 (released Tuesday, June 24 1997): | |
cf78e9e8 | 4720 | |
737c9113 JB |
4721 | * Changes to the distribution |
4722 | ||
832b09ed JB |
4723 | ** Nightly snapshots are now available from ftp.red-bean.com. |
4724 | The old server, ftp.cyclic.com, has been relinquished to its rightful | |
4725 | owner. | |
4726 | ||
4727 | Nightly snapshots of the Guile development sources are now available via | |
4728 | anonymous FTP from ftp.red-bean.com, as /pub/guile/guile-snap.tar.gz. | |
4729 | ||
4730 | Via the web, that's: ftp://ftp.red-bean.com/pub/guile/guile-snap.tar.gz | |
4731 | For getit, that's: ftp.red-bean.com:/pub/guile/guile-snap.tar.gz | |
4732 | ||
0fcab5ed JB |
4733 | ** To run Guile without installing it, the procedure has changed a bit. |
4734 | ||
4735 | If you used a separate build directory to compile Guile, you'll need | |
4736 | to include the build directory in SCHEME_LOAD_PATH, as well as the | |
4737 | source directory. See the `INSTALL' file for examples. | |
4738 | ||
737c9113 JB |
4739 | * Changes to the procedure for linking libguile with your programs |
4740 | ||
94982a4e JB |
4741 | ** The standard Guile load path for Scheme code now includes |
4742 | $(datadir)/guile (usually /usr/local/share/guile). This means that | |
4743 | you can install your own Scheme files there, and Guile will find them. | |
4744 | (Previous versions of Guile only checked a directory whose name | |
4745 | contained the Guile version number, so you had to re-install or move | |
4746 | your Scheme sources each time you installed a fresh version of Guile.) | |
4747 | ||
4748 | The load path also includes $(datadir)/guile/site; we recommend | |
4749 | putting individual Scheme files there. If you want to install a | |
4750 | package with multiple source files, create a directory for them under | |
4751 | $(datadir)/guile. | |
4752 | ||
4753 | ** Guile 1.2 will now use the Rx regular expression library, if it is | |
4754 | installed on your system. When you are linking libguile into your own | |
4755 | programs, this means you will have to link against -lguile, -lqt (if | |
4756 | you configured Guile with thread support), and -lrx. | |
27590f82 JB |
4757 | |
4758 | If you are using autoconf to generate configuration scripts for your | |
4759 | application, the following lines should suffice to add the appropriate | |
4760 | libraries to your link command: | |
4761 | ||
4762 | ### Find Rx, quickthreads and libguile. | |
4763 | AC_CHECK_LIB(rx, main) | |
4764 | AC_CHECK_LIB(qt, main) | |
4765 | AC_CHECK_LIB(guile, scm_shell) | |
4766 | ||
94982a4e JB |
4767 | The Guile 1.2 distribution does not contain sources for the Rx |
4768 | library, as Guile 1.0 did. If you want to use Rx, you'll need to | |
4769 | retrieve it from a GNU FTP site and install it separately. | |
4770 | ||
b83b8bee JB |
4771 | * Changes to Scheme functions and syntax |
4772 | ||
e035e7e6 MV |
4773 | ** The dynamic linking features of Guile are now enabled by default. |
4774 | You can disable them by giving the `--disable-dynamic-linking' option | |
4775 | to configure. | |
4776 | ||
e035e7e6 MV |
4777 | (dynamic-link FILENAME) |
4778 | ||
4779 | Find the object file denoted by FILENAME (a string) and link it | |
4780 | into the running Guile application. When everything works out, | |
4781 | return a Scheme object suitable for representing the linked object | |
4782 | file. Otherwise an error is thrown. How object files are | |
4783 | searched is system dependent. | |
4784 | ||
4785 | (dynamic-object? VAL) | |
4786 | ||
4787 | Determine whether VAL represents a dynamically linked object file. | |
4788 | ||
4789 | (dynamic-unlink DYNOBJ) | |
4790 | ||
4791 | Unlink the indicated object file from the application. DYNOBJ | |
4792 | should be one of the values returned by `dynamic-link'. | |
4793 | ||
4794 | (dynamic-func FUNCTION DYNOBJ) | |
4795 | ||
4796 | Search the C function indicated by FUNCTION (a string or symbol) | |
4797 | in DYNOBJ and return some Scheme object that can later be used | |
4798 | with `dynamic-call' to actually call this function. Right now, | |
4799 | these Scheme objects are formed by casting the address of the | |
4800 | function to `long' and converting this number to its Scheme | |
4801 | representation. | |
4802 | ||
4803 | (dynamic-call FUNCTION DYNOBJ) | |
4804 | ||
4805 | Call the C function indicated by FUNCTION and DYNOBJ. The | |
4806 | function is passed no arguments and its return value is ignored. | |
4807 | When FUNCTION is something returned by `dynamic-func', call that | |
4808 | function and ignore DYNOBJ. When FUNCTION is a string (or symbol, | |
4809 | etc.), look it up in DYNOBJ; this is equivalent to | |
4810 | ||
4811 | (dynamic-call (dynamic-func FUNCTION DYNOBJ) #f) | |
4812 | ||
4813 | Interrupts are deferred while the C function is executing (with | |
4814 | SCM_DEFER_INTS/SCM_ALLOW_INTS). | |
4815 | ||
4816 | (dynamic-args-call FUNCTION DYNOBJ ARGS) | |
4817 | ||
4818 | Call the C function indicated by FUNCTION and DYNOBJ, but pass it | |
4819 | some arguments and return its return value. The C function is | |
4820 | expected to take two arguments and return an `int', just like | |
4821 | `main': | |
4822 | ||
4823 | int c_func (int argc, char **argv); | |
4824 | ||
4825 | ARGS must be a list of strings and is converted into an array of | |
4826 | `char *'. The array is passed in ARGV and its size in ARGC. The | |
4827 | return value is converted to a Scheme number and returned from the | |
4828 | call to `dynamic-args-call'. | |
4829 | ||
0fcab5ed JB |
4830 | When dynamic linking is disabled or not supported on your system, |
4831 | the above functions throw errors, but they are still available. | |
4832 | ||
e035e7e6 MV |
4833 | Here is a small example that works on GNU/Linux: |
4834 | ||
4835 | (define libc-obj (dynamic-link "libc.so")) | |
4836 | (dynamic-args-call 'rand libc-obj '()) | |
4837 | ||
4838 | See the file `libguile/DYNAMIC-LINKING' for additional comments. | |
4839 | ||
27590f82 | 4840 | ** The #/ syntax for module names is depreciated, and will be removed |
6c0201ad | 4841 | in a future version of Guile. Instead of |
27590f82 JB |
4842 | |
4843 | #/foo/bar/baz | |
4844 | ||
4845 | instead write | |
4846 | ||
4847 | (foo bar baz) | |
4848 | ||
4849 | The latter syntax is more consistent with existing Lisp practice. | |
4850 | ||
5dade857 MV |
4851 | ** Guile now does fancier printing of structures. Structures are the |
4852 | underlying implementation for records, which in turn are used to | |
4853 | implement modules, so all of these object now print differently and in | |
4854 | a more informative way. | |
4855 | ||
161029df JB |
4856 | The Scheme printer will examine the builtin variable *struct-printer* |
4857 | whenever it needs to print a structure object. When this variable is | |
4858 | not `#f' it is deemed to be a procedure and will be applied to the | |
4859 | structure object and the output port. When *struct-printer* is `#f' | |
4860 | or the procedure return `#f' the structure object will be printed in | |
4861 | the boring #<struct 80458270> form. | |
5dade857 MV |
4862 | |
4863 | This hook is used by some routines in ice-9/boot-9.scm to implement | |
4864 | type specific printing routines. Please read the comments there about | |
4865 | "printing structs". | |
4866 | ||
4867 | One of the more specific uses of structs are records. The printing | |
4868 | procedure that could be passed to MAKE-RECORD-TYPE is now actually | |
4869 | called. It should behave like a *struct-printer* procedure (described | |
4870 | above). | |
4871 | ||
b83b8bee JB |
4872 | ** Guile now supports a new R4RS-compliant syntax for keywords. A |
4873 | token of the form #:NAME, where NAME has the same syntax as a Scheme | |
4874 | symbol, is the external representation of the keyword named NAME. | |
4875 | Keyword objects print using this syntax as well, so values containing | |
1e5afba0 JB |
4876 | keyword objects can be read back into Guile. When used in an |
4877 | expression, keywords are self-quoting objects. | |
b83b8bee JB |
4878 | |
4879 | Guile suports this read syntax, and uses this print syntax, regardless | |
4880 | of the current setting of the `keyword' read option. The `keyword' | |
4881 | read option only controls whether Guile recognizes the `:NAME' syntax, | |
4882 | which is incompatible with R4RS. (R4RS says such token represent | |
4883 | symbols.) | |
737c9113 JB |
4884 | |
4885 | ** Guile has regular expression support again. Guile 1.0 included | |
4886 | functions for matching regular expressions, based on the Rx library. | |
4887 | In Guile 1.1, the Guile/Rx interface was removed to simplify the | |
4888 | distribution, and thus Guile had no regular expression support. Guile | |
94982a4e JB |
4889 | 1.2 again supports the most commonly used functions, and supports all |
4890 | of SCSH's regular expression functions. | |
2409cdfa | 4891 | |
94982a4e JB |
4892 | If your system does not include a POSIX regular expression library, |
4893 | and you have not linked Guile with a third-party regexp library such as | |
4894 | Rx, these functions will not be available. You can tell whether your | |
4895 | Guile installation includes regular expression support by checking | |
4896 | whether the `*features*' list includes the `regex' symbol. | |
737c9113 | 4897 | |
94982a4e | 4898 | *** regexp functions |
161029df | 4899 | |
94982a4e JB |
4900 | By default, Guile supports POSIX extended regular expressions. That |
4901 | means that the characters `(', `)', `+' and `?' are special, and must | |
4902 | be escaped if you wish to match the literal characters. | |
e1a191a8 | 4903 | |
94982a4e JB |
4904 | This regular expression interface was modeled after that implemented |
4905 | by SCSH, the Scheme Shell. It is intended to be upwardly compatible | |
4906 | with SCSH regular expressions. | |
4907 | ||
4908 | **** Function: string-match PATTERN STR [START] | |
4909 | Compile the string PATTERN into a regular expression and compare | |
4910 | it with STR. The optional numeric argument START specifies the | |
4911 | position of STR at which to begin matching. | |
4912 | ||
4913 | `string-match' returns a "match structure" which describes what, | |
4914 | if anything, was matched by the regular expression. *Note Match | |
4915 | Structures::. If STR does not match PATTERN at all, | |
4916 | `string-match' returns `#f'. | |
4917 | ||
4918 | Each time `string-match' is called, it must compile its PATTERN | |
4919 | argument into a regular expression structure. This operation is | |
4920 | expensive, which makes `string-match' inefficient if the same regular | |
4921 | expression is used several times (for example, in a loop). For better | |
4922 | performance, you can compile a regular expression in advance and then | |
4923 | match strings against the compiled regexp. | |
4924 | ||
4925 | **** Function: make-regexp STR [FLAGS] | |
4926 | Compile the regular expression described by STR, and return the | |
4927 | compiled regexp structure. If STR does not describe a legal | |
4928 | regular expression, `make-regexp' throws a | |
4929 | `regular-expression-syntax' error. | |
4930 | ||
4931 | FLAGS may be the bitwise-or of one or more of the following: | |
4932 | ||
4933 | **** Constant: regexp/extended | |
4934 | Use POSIX Extended Regular Expression syntax when interpreting | |
4935 | STR. If not set, POSIX Basic Regular Expression syntax is used. | |
4936 | If the FLAGS argument is omitted, we assume regexp/extended. | |
4937 | ||
4938 | **** Constant: regexp/icase | |
4939 | Do not differentiate case. Subsequent searches using the | |
4940 | returned regular expression will be case insensitive. | |
4941 | ||
4942 | **** Constant: regexp/newline | |
4943 | Match-any-character operators don't match a newline. | |
4944 | ||
4945 | A non-matching list ([^...]) not containing a newline matches a | |
4946 | newline. | |
4947 | ||
4948 | Match-beginning-of-line operator (^) matches the empty string | |
4949 | immediately after a newline, regardless of whether the FLAGS | |
4950 | passed to regexp-exec contain regexp/notbol. | |
4951 | ||
4952 | Match-end-of-line operator ($) matches the empty string | |
4953 | immediately before a newline, regardless of whether the FLAGS | |
4954 | passed to regexp-exec contain regexp/noteol. | |
4955 | ||
4956 | **** Function: regexp-exec REGEXP STR [START [FLAGS]] | |
4957 | Match the compiled regular expression REGEXP against `str'. If | |
4958 | the optional integer START argument is provided, begin matching | |
4959 | from that position in the string. Return a match structure | |
4960 | describing the results of the match, or `#f' if no match could be | |
4961 | found. | |
4962 | ||
4963 | FLAGS may be the bitwise-or of one or more of the following: | |
4964 | ||
4965 | **** Constant: regexp/notbol | |
4966 | The match-beginning-of-line operator always fails to match (but | |
4967 | see the compilation flag regexp/newline above) This flag may be | |
4968 | used when different portions of a string are passed to | |
4969 | regexp-exec and the beginning of the string should not be | |
4970 | interpreted as the beginning of the line. | |
4971 | ||
4972 | **** Constant: regexp/noteol | |
4973 | The match-end-of-line operator always fails to match (but see the | |
4974 | compilation flag regexp/newline above) | |
4975 | ||
4976 | **** Function: regexp? OBJ | |
4977 | Return `#t' if OBJ is a compiled regular expression, or `#f' | |
4978 | otherwise. | |
4979 | ||
4980 | Regular expressions are commonly used to find patterns in one string | |
4981 | and replace them with the contents of another string. | |
4982 | ||
4983 | **** Function: regexp-substitute PORT MATCH [ITEM...] | |
4984 | Write to the output port PORT selected contents of the match | |
4985 | structure MATCH. Each ITEM specifies what should be written, and | |
4986 | may be one of the following arguments: | |
4987 | ||
4988 | * A string. String arguments are written out verbatim. | |
4989 | ||
4990 | * An integer. The submatch with that number is written. | |
4991 | ||
4992 | * The symbol `pre'. The portion of the matched string preceding | |
4993 | the regexp match is written. | |
4994 | ||
4995 | * The symbol `post'. The portion of the matched string | |
4996 | following the regexp match is written. | |
4997 | ||
4998 | PORT may be `#f', in which case nothing is written; instead, | |
4999 | `regexp-substitute' constructs a string from the specified ITEMs | |
5000 | and returns that. | |
5001 | ||
5002 | **** Function: regexp-substitute/global PORT REGEXP TARGET [ITEM...] | |
5003 | Similar to `regexp-substitute', but can be used to perform global | |
5004 | substitutions on STR. Instead of taking a match structure as an | |
5005 | argument, `regexp-substitute/global' takes two string arguments: a | |
5006 | REGEXP string describing a regular expression, and a TARGET string | |
5007 | which should be matched against this regular expression. | |
5008 | ||
5009 | Each ITEM behaves as in REGEXP-SUBSTITUTE, with the following | |
5010 | exceptions: | |
5011 | ||
5012 | * A function may be supplied. When this function is called, it | |
5013 | will be passed one argument: a match structure for a given | |
5014 | regular expression match. It should return a string to be | |
5015 | written out to PORT. | |
5016 | ||
5017 | * The `post' symbol causes `regexp-substitute/global' to recurse | |
5018 | on the unmatched portion of STR. This *must* be supplied in | |
5019 | order to perform global search-and-replace on STR; if it is | |
5020 | not present among the ITEMs, then `regexp-substitute/global' | |
5021 | will return after processing a single match. | |
5022 | ||
5023 | *** Match Structures | |
5024 | ||
5025 | A "match structure" is the object returned by `string-match' and | |
5026 | `regexp-exec'. It describes which portion of a string, if any, matched | |
5027 | the given regular expression. Match structures include: a reference to | |
5028 | the string that was checked for matches; the starting and ending | |
5029 | positions of the regexp match; and, if the regexp included any | |
5030 | parenthesized subexpressions, the starting and ending positions of each | |
5031 | submatch. | |
5032 | ||
5033 | In each of the regexp match functions described below, the `match' | |
5034 | argument must be a match structure returned by a previous call to | |
5035 | `string-match' or `regexp-exec'. Most of these functions return some | |
5036 | information about the original target string that was matched against a | |
5037 | regular expression; we will call that string TARGET for easy reference. | |
5038 | ||
5039 | **** Function: regexp-match? OBJ | |
5040 | Return `#t' if OBJ is a match structure returned by a previous | |
5041 | call to `regexp-exec', or `#f' otherwise. | |
5042 | ||
5043 | **** Function: match:substring MATCH [N] | |
5044 | Return the portion of TARGET matched by subexpression number N. | |
5045 | Submatch 0 (the default) represents the entire regexp match. If | |
5046 | the regular expression as a whole matched, but the subexpression | |
5047 | number N did not match, return `#f'. | |
5048 | ||
5049 | **** Function: match:start MATCH [N] | |
5050 | Return the starting position of submatch number N. | |
5051 | ||
5052 | **** Function: match:end MATCH [N] | |
5053 | Return the ending position of submatch number N. | |
5054 | ||
5055 | **** Function: match:prefix MATCH | |
5056 | Return the unmatched portion of TARGET preceding the regexp match. | |
5057 | ||
5058 | **** Function: match:suffix MATCH | |
5059 | Return the unmatched portion of TARGET following the regexp match. | |
5060 | ||
5061 | **** Function: match:count MATCH | |
5062 | Return the number of parenthesized subexpressions from MATCH. | |
5063 | Note that the entire regular expression match itself counts as a | |
5064 | subexpression, and failed submatches are included in the count. | |
5065 | ||
5066 | **** Function: match:string MATCH | |
5067 | Return the original TARGET string. | |
5068 | ||
5069 | *** Backslash Escapes | |
5070 | ||
5071 | Sometimes you will want a regexp to match characters like `*' or `$' | |
5072 | exactly. For example, to check whether a particular string represents | |
5073 | a menu entry from an Info node, it would be useful to match it against | |
5074 | a regexp like `^* [^:]*::'. However, this won't work; because the | |
5075 | asterisk is a metacharacter, it won't match the `*' at the beginning of | |
5076 | the string. In this case, we want to make the first asterisk un-magic. | |
5077 | ||
5078 | You can do this by preceding the metacharacter with a backslash | |
5079 | character `\'. (This is also called "quoting" the metacharacter, and | |
5080 | is known as a "backslash escape".) When Guile sees a backslash in a | |
5081 | regular expression, it considers the following glyph to be an ordinary | |
5082 | character, no matter what special meaning it would ordinarily have. | |
5083 | Therefore, we can make the above example work by changing the regexp to | |
5084 | `^\* [^:]*::'. The `\*' sequence tells the regular expression engine | |
5085 | to match only a single asterisk in the target string. | |
5086 | ||
5087 | Since the backslash is itself a metacharacter, you may force a | |
5088 | regexp to match a backslash in the target string by preceding the | |
5089 | backslash with itself. For example, to find variable references in a | |
5090 | TeX program, you might want to find occurrences of the string `\let\' | |
5091 | followed by any number of alphabetic characters. The regular expression | |
5092 | `\\let\\[A-Za-z]*' would do this: the double backslashes in the regexp | |
5093 | each match a single backslash in the target string. | |
5094 | ||
5095 | **** Function: regexp-quote STR | |
5096 | Quote each special character found in STR with a backslash, and | |
5097 | return the resulting string. | |
5098 | ||
5099 | *Very important:* Using backslash escapes in Guile source code (as | |
5100 | in Emacs Lisp or C) can be tricky, because the backslash character has | |
5101 | special meaning for the Guile reader. For example, if Guile encounters | |
5102 | the character sequence `\n' in the middle of a string while processing | |
5103 | Scheme code, it replaces those characters with a newline character. | |
5104 | Similarly, the character sequence `\t' is replaced by a horizontal tab. | |
5105 | Several of these "escape sequences" are processed by the Guile reader | |
5106 | before your code is executed. Unrecognized escape sequences are | |
5107 | ignored: if the characters `\*' appear in a string, they will be | |
5108 | translated to the single character `*'. | |
5109 | ||
5110 | This translation is obviously undesirable for regular expressions, | |
5111 | since we want to be able to include backslashes in a string in order to | |
5112 | escape regexp metacharacters. Therefore, to make sure that a backslash | |
5113 | is preserved in a string in your Guile program, you must use *two* | |
5114 | consecutive backslashes: | |
5115 | ||
5116 | (define Info-menu-entry-pattern (make-regexp "^\\* [^:]*")) | |
5117 | ||
5118 | The string in this example is preprocessed by the Guile reader before | |
5119 | any code is executed. The resulting argument to `make-regexp' is the | |
5120 | string `^\* [^:]*', which is what we really want. | |
5121 | ||
5122 | This also means that in order to write a regular expression that | |
5123 | matches a single backslash character, the regular expression string in | |
5124 | the source code must include *four* backslashes. Each consecutive pair | |
5125 | of backslashes gets translated by the Guile reader to a single | |
5126 | backslash, and the resulting double-backslash is interpreted by the | |
5127 | regexp engine as matching a single backslash character. Hence: | |
5128 | ||
5129 | (define tex-variable-pattern (make-regexp "\\\\let\\\\=[A-Za-z]*")) | |
5130 | ||
5131 | The reason for the unwieldiness of this syntax is historical. Both | |
5132 | regular expression pattern matchers and Unix string processing systems | |
5133 | have traditionally used backslashes with the special meanings described | |
5134 | above. The POSIX regular expression specification and ANSI C standard | |
5135 | both require these semantics. Attempting to abandon either convention | |
5136 | would cause other kinds of compatibility problems, possibly more severe | |
5137 | ones. Therefore, without extending the Scheme reader to support | |
5138 | strings with different quoting conventions (an ungainly and confusing | |
5139 | extension when implemented in other languages), we must adhere to this | |
5140 | cumbersome escape syntax. | |
5141 | ||
7ad3c1e7 GH |
5142 | * Changes to the gh_ interface |
5143 | ||
5144 | * Changes to the scm_ interface | |
5145 | ||
5146 | * Changes to system call interfaces: | |
94982a4e | 5147 | |
7ad3c1e7 | 5148 | ** The value returned by `raise' is now unspecified. It throws an exception |
e1a191a8 GH |
5149 | if an error occurs. |
5150 | ||
94982a4e | 5151 | *** A new procedure `sigaction' can be used to install signal handlers |
115b09a5 GH |
5152 | |
5153 | (sigaction signum [action] [flags]) | |
5154 | ||
5155 | signum is the signal number, which can be specified using the value | |
5156 | of SIGINT etc. | |
5157 | ||
5158 | If action is omitted, sigaction returns a pair: the CAR is the current | |
5159 | signal hander, which will be either an integer with the value SIG_DFL | |
5160 | (default action) or SIG_IGN (ignore), or the Scheme procedure which | |
5161 | handles the signal, or #f if a non-Scheme procedure handles the | |
5162 | signal. The CDR contains the current sigaction flags for the handler. | |
5163 | ||
5164 | If action is provided, it is installed as the new handler for signum. | |
5165 | action can be a Scheme procedure taking one argument, or the value of | |
5166 | SIG_DFL (default action) or SIG_IGN (ignore), or #f to restore | |
5167 | whatever signal handler was installed before sigaction was first used. | |
5168 | Flags can optionally be specified for the new handler (SA_RESTART is | |
5169 | always used if the system provides it, so need not be specified.) The | |
5170 | return value is a pair with information about the old handler as | |
5171 | described above. | |
5172 | ||
5173 | This interface does not provide access to the "signal blocking" | |
5174 | facility. Maybe this is not needed, since the thread support may | |
5175 | provide solutions to the problem of consistent access to data | |
5176 | structures. | |
e1a191a8 | 5177 | |
94982a4e | 5178 | *** A new procedure `flush-all-ports' is equivalent to running |
89ea5b7c GH |
5179 | `force-output' on every port open for output. |
5180 | ||
94982a4e JB |
5181 | ** Guile now provides information on how it was built, via the new |
5182 | global variable, %guile-build-info. This variable records the values | |
5183 | of the standard GNU makefile directory variables as an assocation | |
5184 | list, mapping variable names (symbols) onto directory paths (strings). | |
5185 | For example, to find out where the Guile link libraries were | |
5186 | installed, you can say: | |
5187 | ||
5188 | guile -c "(display (assq-ref %guile-build-info 'libdir)) (newline)" | |
5189 | ||
5190 | ||
5191 | * Changes to the scm_ interface | |
5192 | ||
5193 | ** The new function scm_handle_by_message_noexit is just like the | |
5194 | existing scm_handle_by_message function, except that it doesn't call | |
5195 | exit to terminate the process. Instead, it prints a message and just | |
5196 | returns #f. This might be a more appropriate catch-all handler for | |
5197 | new dynamic roots and threads. | |
5198 | ||
cf78e9e8 | 5199 | \f |
c484bf7f | 5200 | Changes in Guile 1.1 (released Friday, May 16 1997): |
f3b1485f JB |
5201 | |
5202 | * Changes to the distribution. | |
5203 | ||
5204 | The Guile 1.0 distribution has been split up into several smaller | |
5205 | pieces: | |
5206 | guile-core --- the Guile interpreter itself. | |
5207 | guile-tcltk --- the interface between the Guile interpreter and | |
5208 | Tcl/Tk; Tcl is an interpreter for a stringy language, and Tk | |
5209 | is a toolkit for building graphical user interfaces. | |
5210 | guile-rgx-ctax --- the interface between Guile and the Rx regular | |
5211 | expression matcher, and the translator for the Ctax | |
5212 | programming language. These are packaged together because the | |
5213 | Ctax translator uses Rx to parse Ctax source code. | |
5214 | ||
095936d2 JB |
5215 | This NEWS file describes the changes made to guile-core since the 1.0 |
5216 | release. | |
5217 | ||
48d224d7 JB |
5218 | We no longer distribute the documentation, since it was either out of |
5219 | date, or incomplete. As soon as we have current documentation, we | |
5220 | will distribute it. | |
5221 | ||
0fcab5ed JB |
5222 | |
5223 | ||
f3b1485f JB |
5224 | * Changes to the stand-alone interpreter |
5225 | ||
48d224d7 JB |
5226 | ** guile now accepts command-line arguments compatible with SCSH, Olin |
5227 | Shivers' Scheme Shell. | |
5228 | ||
5229 | In general, arguments are evaluated from left to right, but there are | |
5230 | exceptions. The following switches stop argument processing, and | |
5231 | stash all remaining command-line arguments as the value returned by | |
5232 | the (command-line) function. | |
5233 | -s SCRIPT load Scheme source code from FILE, and exit | |
5234 | -c EXPR evalute Scheme expression EXPR, and exit | |
5235 | -- stop scanning arguments; run interactively | |
5236 | ||
5237 | The switches below are processed as they are encountered. | |
5238 | -l FILE load Scheme source code from FILE | |
5239 | -e FUNCTION after reading script, apply FUNCTION to | |
5240 | command line arguments | |
5241 | -ds do -s script at this point | |
5242 | --emacs enable Emacs protocol (experimental) | |
5243 | -h, --help display this help and exit | |
5244 | -v, --version display version information and exit | |
5245 | \ read arguments from following script lines | |
5246 | ||
5247 | So, for example, here is a Guile script named `ekko' (thanks, Olin) | |
5248 | which re-implements the traditional "echo" command: | |
5249 | ||
5250 | #!/usr/local/bin/guile -s | |
5251 | !# | |
5252 | (define (main args) | |
5253 | (map (lambda (arg) (display arg) (display " ")) | |
5254 | (cdr args)) | |
5255 | (newline)) | |
5256 | ||
5257 | (main (command-line)) | |
5258 | ||
5259 | Suppose we invoke this script as follows: | |
5260 | ||
5261 | ekko a speckled gecko | |
5262 | ||
5263 | Through the magic of Unix script processing (triggered by the `#!' | |
5264 | token at the top of the file), /usr/local/bin/guile receives the | |
5265 | following list of command-line arguments: | |
5266 | ||
5267 | ("-s" "./ekko" "a" "speckled" "gecko") | |
5268 | ||
5269 | Unix inserts the name of the script after the argument specified on | |
5270 | the first line of the file (in this case, "-s"), and then follows that | |
5271 | with the arguments given to the script. Guile loads the script, which | |
5272 | defines the `main' function, and then applies it to the list of | |
5273 | remaining command-line arguments, ("a" "speckled" "gecko"). | |
5274 | ||
095936d2 JB |
5275 | In Unix, the first line of a script file must take the following form: |
5276 | ||
5277 | #!INTERPRETER ARGUMENT | |
5278 | ||
5279 | where INTERPRETER is the absolute filename of the interpreter | |
5280 | executable, and ARGUMENT is a single command-line argument to pass to | |
5281 | the interpreter. | |
5282 | ||
5283 | You may only pass one argument to the interpreter, and its length is | |
5284 | limited. These restrictions can be annoying to work around, so Guile | |
5285 | provides a general mechanism (borrowed from, and compatible with, | |
5286 | SCSH) for circumventing them. | |
5287 | ||
5288 | If the ARGUMENT in a Guile script is a single backslash character, | |
5289 | `\', Guile will open the script file, parse arguments from its second | |
5290 | and subsequent lines, and replace the `\' with them. So, for example, | |
5291 | here is another implementation of the `ekko' script: | |
5292 | ||
5293 | #!/usr/local/bin/guile \ | |
5294 | -e main -s | |
5295 | !# | |
5296 | (define (main args) | |
5297 | (for-each (lambda (arg) (display arg) (display " ")) | |
5298 | (cdr args)) | |
5299 | (newline)) | |
5300 | ||
5301 | If the user invokes this script as follows: | |
5302 | ||
5303 | ekko a speckled gecko | |
5304 | ||
5305 | Unix expands this into | |
5306 | ||
5307 | /usr/local/bin/guile \ ekko a speckled gecko | |
5308 | ||
5309 | When Guile sees the `\' argument, it replaces it with the arguments | |
5310 | read from the second line of the script, producing: | |
5311 | ||
5312 | /usr/local/bin/guile -e main -s ekko a speckled gecko | |
5313 | ||
5314 | This tells Guile to load the `ekko' script, and apply the function | |
5315 | `main' to the argument list ("a" "speckled" "gecko"). | |
5316 | ||
5317 | Here is how Guile parses the command-line arguments: | |
5318 | - Each space character terminates an argument. This means that two | |
5319 | spaces in a row introduce an empty-string argument. | |
5320 | - The tab character is not permitted (unless you quote it with the | |
5321 | backslash character, as described below), to avoid confusion. | |
5322 | - The newline character terminates the sequence of arguments, and will | |
5323 | also terminate a final non-empty argument. (However, a newline | |
5324 | following a space will not introduce a final empty-string argument; | |
5325 | it only terminates the argument list.) | |
5326 | - The backslash character is the escape character. It escapes | |
5327 | backslash, space, tab, and newline. The ANSI C escape sequences | |
5328 | like \n and \t are also supported. These produce argument | |
5329 | constituents; the two-character combination \n doesn't act like a | |
5330 | terminating newline. The escape sequence \NNN for exactly three | |
5331 | octal digits reads as the character whose ASCII code is NNN. As | |
5332 | above, characters produced this way are argument constituents. | |
5333 | Backslash followed by other characters is not allowed. | |
5334 | ||
48d224d7 JB |
5335 | * Changes to the procedure for linking libguile with your programs |
5336 | ||
5337 | ** Guile now builds and installs a shared guile library, if your | |
5338 | system support shared libraries. (It still builds a static library on | |
5339 | all systems.) Guile automatically detects whether your system | |
5340 | supports shared libraries. To prevent Guile from buildisg shared | |
5341 | libraries, pass the `--disable-shared' flag to the configure script. | |
5342 | ||
5343 | Guile takes longer to compile when it builds shared libraries, because | |
5344 | it must compile every file twice --- once to produce position- | |
5345 | independent object code, and once to produce normal object code. | |
5346 | ||
5347 | ** The libthreads library has been merged into libguile. | |
5348 | ||
5349 | To link a program against Guile, you now need only link against | |
5350 | -lguile and -lqt; -lthreads is no longer needed. If you are using | |
5351 | autoconf to generate configuration scripts for your application, the | |
5352 | following lines should suffice to add the appropriate libraries to | |
5353 | your link command: | |
5354 | ||
5355 | ### Find quickthreads and libguile. | |
5356 | AC_CHECK_LIB(qt, main) | |
5357 | AC_CHECK_LIB(guile, scm_shell) | |
f3b1485f JB |
5358 | |
5359 | * Changes to Scheme functions | |
5360 | ||
095936d2 JB |
5361 | ** Guile Scheme's special syntax for keyword objects is now optional, |
5362 | and disabled by default. | |
5363 | ||
5364 | The syntax variation from R4RS made it difficult to port some | |
5365 | interesting packages to Guile. The routines which accepted keyword | |
5366 | arguments (mostly in the module system) have been modified to also | |
5367 | accept symbols whose names begin with `:'. | |
5368 | ||
5369 | To change the keyword syntax, you must first import the (ice-9 debug) | |
5370 | module: | |
5371 | (use-modules (ice-9 debug)) | |
5372 | ||
5373 | Then you can enable the keyword syntax as follows: | |
5374 | (read-set! keywords 'prefix) | |
5375 | ||
5376 | To disable keyword syntax, do this: | |
5377 | (read-set! keywords #f) | |
5378 | ||
5379 | ** Many more primitive functions accept shared substrings as | |
5380 | arguments. In the past, these functions required normal, mutable | |
5381 | strings as arguments, although they never made use of this | |
5382 | restriction. | |
5383 | ||
5384 | ** The uniform array functions now operate on byte vectors. These | |
5385 | functions are `array-fill!', `serial-array-copy!', `array-copy!', | |
5386 | `serial-array-map', `array-map', `array-for-each', and | |
5387 | `array-index-map!'. | |
5388 | ||
5389 | ** The new functions `trace' and `untrace' implement simple debugging | |
5390 | support for Scheme functions. | |
5391 | ||
5392 | The `trace' function accepts any number of procedures as arguments, | |
5393 | and tells the Guile interpreter to display each procedure's name and | |
5394 | arguments each time the procedure is invoked. When invoked with no | |
5395 | arguments, `trace' returns the list of procedures currently being | |
5396 | traced. | |
5397 | ||
5398 | The `untrace' function accepts any number of procedures as arguments, | |
5399 | and tells the Guile interpreter not to trace them any more. When | |
5400 | invoked with no arguments, `untrace' untraces all curretly traced | |
5401 | procedures. | |
5402 | ||
5403 | The tracing in Guile has an advantage over most other systems: we | |
5404 | don't create new procedure objects, but mark the procedure objects | |
5405 | themselves. This means that anonymous and internal procedures can be | |
5406 | traced. | |
5407 | ||
5408 | ** The function `assert-repl-prompt' has been renamed to | |
5409 | `set-repl-prompt!'. It takes one argument, PROMPT. | |
5410 | - If PROMPT is #f, the Guile read-eval-print loop will not prompt. | |
5411 | - If PROMPT is a string, we use it as a prompt. | |
5412 | - If PROMPT is a procedure accepting no arguments, we call it, and | |
5413 | display the result as a prompt. | |
5414 | - Otherwise, we display "> ". | |
5415 | ||
5416 | ** The new function `eval-string' reads Scheme expressions from a | |
5417 | string and evaluates them, returning the value of the last expression | |
5418 | in the string. If the string contains no expressions, it returns an | |
5419 | unspecified value. | |
5420 | ||
5421 | ** The new function `thunk?' returns true iff its argument is a | |
5422 | procedure of zero arguments. | |
5423 | ||
5424 | ** `defined?' is now a builtin function, instead of syntax. This | |
5425 | means that its argument should be quoted. It returns #t iff its | |
5426 | argument is bound in the current module. | |
5427 | ||
5428 | ** The new syntax `use-modules' allows you to add new modules to your | |
5429 | environment without re-typing a complete `define-module' form. It | |
5430 | accepts any number of module names as arguments, and imports their | |
5431 | public bindings into the current module. | |
5432 | ||
5433 | ** The new function (module-defined? NAME MODULE) returns true iff | |
5434 | NAME, a symbol, is defined in MODULE, a module object. | |
5435 | ||
5436 | ** The new function `builtin-bindings' creates and returns a hash | |
5437 | table containing copies of all the root module's bindings. | |
5438 | ||
5439 | ** The new function `builtin-weak-bindings' does the same as | |
5440 | `builtin-bindings', but creates a doubly-weak hash table. | |
5441 | ||
5442 | ** The `equal?' function now considers variable objects to be | |
5443 | equivalent if they have the same name and the same value. | |
5444 | ||
5445 | ** The new function `command-line' returns the command-line arguments | |
5446 | given to Guile, as a list of strings. | |
5447 | ||
5448 | When using guile as a script interpreter, `command-line' returns the | |
5449 | script's arguments; those processed by the interpreter (like `-s' or | |
5450 | `-c') are omitted. (In other words, you get the normal, expected | |
5451 | behavior.) Any application that uses scm_shell to process its | |
5452 | command-line arguments gets this behavior as well. | |
5453 | ||
5454 | ** The new function `load-user-init' looks for a file called `.guile' | |
5455 | in the user's home directory, and loads it if it exists. This is | |
5456 | mostly for use by the code generated by scm_compile_shell_switches, | |
5457 | but we thought it might also be useful in other circumstances. | |
5458 | ||
5459 | ** The new function `log10' returns the base-10 logarithm of its | |
5460 | argument. | |
5461 | ||
5462 | ** Changes to I/O functions | |
5463 | ||
6c0201ad | 5464 | *** The functions `read', `primitive-load', `read-and-eval!', and |
095936d2 JB |
5465 | `primitive-load-path' no longer take optional arguments controlling |
5466 | case insensitivity and a `#' parser. | |
5467 | ||
5468 | Case sensitivity is now controlled by a read option called | |
5469 | `case-insensitive'. The user can add new `#' syntaxes with the | |
5470 | `read-hash-extend' function (see below). | |
5471 | ||
5472 | *** The new function `read-hash-extend' allows the user to change the | |
5473 | syntax of Guile Scheme in a somewhat controlled way. | |
5474 | ||
5475 | (read-hash-extend CHAR PROC) | |
5476 | When parsing S-expressions, if we read a `#' character followed by | |
5477 | the character CHAR, use PROC to parse an object from the stream. | |
5478 | If PROC is #f, remove any parsing procedure registered for CHAR. | |
5479 | ||
5480 | The reader applies PROC to two arguments: CHAR and an input port. | |
5481 | ||
6c0201ad | 5482 | *** The new functions read-delimited and read-delimited! provide a |
095936d2 JB |
5483 | general mechanism for doing delimited input on streams. |
5484 | ||
5485 | (read-delimited DELIMS [PORT HANDLE-DELIM]) | |
5486 | Read until we encounter one of the characters in DELIMS (a string), | |
5487 | or end-of-file. PORT is the input port to read from; it defaults to | |
5488 | the current input port. The HANDLE-DELIM parameter determines how | |
5489 | the terminating character is handled; it should be one of the | |
5490 | following symbols: | |
5491 | ||
5492 | 'trim omit delimiter from result | |
5493 | 'peek leave delimiter character in input stream | |
5494 | 'concat append delimiter character to returned value | |
5495 | 'split return a pair: (RESULT . TERMINATOR) | |
5496 | ||
5497 | HANDLE-DELIM defaults to 'peek. | |
5498 | ||
5499 | (read-delimited! DELIMS BUF [PORT HANDLE-DELIM START END]) | |
5500 | A side-effecting variant of `read-delimited'. | |
5501 | ||
5502 | The data is written into the string BUF at the indices in the | |
5503 | half-open interval [START, END); the default interval is the whole | |
5504 | string: START = 0 and END = (string-length BUF). The values of | |
5505 | START and END must specify a well-defined interval in BUF, i.e. | |
5506 | 0 <= START <= END <= (string-length BUF). | |
5507 | ||
5508 | It returns NBYTES, the number of bytes read. If the buffer filled | |
5509 | up without a delimiter character being found, it returns #f. If the | |
5510 | port is at EOF when the read starts, it returns the EOF object. | |
5511 | ||
5512 | If an integer is returned (i.e., the read is successfully terminated | |
5513 | by reading a delimiter character), then the HANDLE-DELIM parameter | |
5514 | determines how to handle the terminating character. It is described | |
5515 | above, and defaults to 'peek. | |
5516 | ||
5517 | (The descriptions of these functions were borrowed from the SCSH | |
5518 | manual, by Olin Shivers and Brian Carlstrom.) | |
5519 | ||
5520 | *** The `%read-delimited!' function is the primitive used to implement | |
5521 | `read-delimited' and `read-delimited!'. | |
5522 | ||
5523 | (%read-delimited! DELIMS BUF GOBBLE? [PORT START END]) | |
5524 | ||
5525 | This returns a pair of values: (TERMINATOR . NUM-READ). | |
5526 | - TERMINATOR describes why the read was terminated. If it is a | |
5527 | character or the eof object, then that is the value that terminated | |
5528 | the read. If it is #f, the function filled the buffer without finding | |
5529 | a delimiting character. | |
5530 | - NUM-READ is the number of characters read into BUF. | |
5531 | ||
5532 | If the read is successfully terminated by reading a delimiter | |
5533 | character, then the gobble? parameter determines what to do with the | |
5534 | terminating character. If true, the character is removed from the | |
5535 | input stream; if false, the character is left in the input stream | |
5536 | where a subsequent read operation will retrieve it. In either case, | |
5537 | the character is also the first value returned by the procedure call. | |
5538 | ||
5539 | (The descriptions of this function was borrowed from the SCSH manual, | |
5540 | by Olin Shivers and Brian Carlstrom.) | |
5541 | ||
5542 | *** The `read-line' and `read-line!' functions have changed; they now | |
5543 | trim the terminator by default; previously they appended it to the | |
5544 | returned string. For the old behavior, use (read-line PORT 'concat). | |
5545 | ||
5546 | *** The functions `uniform-array-read!' and `uniform-array-write!' now | |
5547 | take new optional START and END arguments, specifying the region of | |
5548 | the array to read and write. | |
5549 | ||
f348c807 JB |
5550 | *** The `ungetc-char-ready?' function has been removed. We feel it's |
5551 | inappropriate for an interface to expose implementation details this | |
5552 | way. | |
095936d2 JB |
5553 | |
5554 | ** Changes to the Unix library and system call interface | |
5555 | ||
5556 | *** The new fcntl function provides access to the Unix `fcntl' system | |
5557 | call. | |
5558 | ||
5559 | (fcntl PORT COMMAND VALUE) | |
5560 | Apply COMMAND to PORT's file descriptor, with VALUE as an argument. | |
5561 | Values for COMMAND are: | |
5562 | ||
5563 | F_DUPFD duplicate a file descriptor | |
5564 | F_GETFD read the descriptor's close-on-exec flag | |
5565 | F_SETFD set the descriptor's close-on-exec flag to VALUE | |
5566 | F_GETFL read the descriptor's flags, as set on open | |
5567 | F_SETFL set the descriptor's flags, as set on open to VALUE | |
5568 | F_GETOWN return the process ID of a socket's owner, for SIGIO | |
5569 | F_SETOWN set the process that owns a socket to VALUE, for SIGIO | |
5570 | FD_CLOEXEC not sure what this is | |
5571 | ||
5572 | For details, see the documentation for the fcntl system call. | |
5573 | ||
5574 | *** The arguments to `select' have changed, for compatibility with | |
5575 | SCSH. The TIMEOUT parameter may now be non-integral, yielding the | |
5576 | expected behavior. The MILLISECONDS parameter has been changed to | |
5577 | MICROSECONDS, to more closely resemble the underlying system call. | |
5578 | The RVEC, WVEC, and EVEC arguments can now be vectors; the type of the | |
5579 | corresponding return set will be the same. | |
5580 | ||
5581 | *** The arguments to the `mknod' system call have changed. They are | |
5582 | now: | |
5583 | ||
5584 | (mknod PATH TYPE PERMS DEV) | |
5585 | Create a new file (`node') in the file system. PATH is the name of | |
5586 | the file to create. TYPE is the kind of file to create; it should | |
5587 | be 'fifo, 'block-special, or 'char-special. PERMS specifies the | |
5588 | permission bits to give the newly created file. If TYPE is | |
5589 | 'block-special or 'char-special, DEV specifies which device the | |
5590 | special file refers to; its interpretation depends on the kind of | |
5591 | special file being created. | |
5592 | ||
5593 | *** The `fork' function has been renamed to `primitive-fork', to avoid | |
5594 | clashing with various SCSH forks. | |
5595 | ||
5596 | *** The `recv' and `recvfrom' functions have been renamed to `recv!' | |
5597 | and `recvfrom!'. They no longer accept a size for a second argument; | |
5598 | you must pass a string to hold the received value. They no longer | |
5599 | return the buffer. Instead, `recv' returns the length of the message | |
5600 | received, and `recvfrom' returns a pair containing the packet's length | |
6c0201ad | 5601 | and originating address. |
095936d2 JB |
5602 | |
5603 | *** The file descriptor datatype has been removed, as have the | |
5604 | `read-fd', `write-fd', `close', `lseek', and `dup' functions. | |
5605 | We plan to replace these functions with a SCSH-compatible interface. | |
5606 | ||
5607 | *** The `create' function has been removed; it's just a special case | |
5608 | of `open'. | |
5609 | ||
5610 | *** There are new functions to break down process termination status | |
5611 | values. In the descriptions below, STATUS is a value returned by | |
5612 | `waitpid'. | |
5613 | ||
5614 | (status:exit-val STATUS) | |
5615 | If the child process exited normally, this function returns the exit | |
5616 | code for the child process (i.e., the value passed to exit, or | |
5617 | returned from main). If the child process did not exit normally, | |
5618 | this function returns #f. | |
5619 | ||
5620 | (status:stop-sig STATUS) | |
5621 | If the child process was suspended by a signal, this function | |
5622 | returns the signal that suspended the child. Otherwise, it returns | |
5623 | #f. | |
5624 | ||
5625 | (status:term-sig STATUS) | |
5626 | If the child process terminated abnormally, this function returns | |
5627 | the signal that terminated the child. Otherwise, this function | |
5628 | returns false. | |
5629 | ||
5630 | POSIX promises that exactly one of these functions will return true on | |
5631 | a valid STATUS value. | |
5632 | ||
5633 | These functions are compatible with SCSH. | |
5634 | ||
5635 | *** There are new accessors and setters for the broken-out time vectors | |
48d224d7 JB |
5636 | returned by `localtime', `gmtime', and that ilk. They are: |
5637 | ||
5638 | Component Accessor Setter | |
5639 | ========================= ============ ============ | |
5640 | seconds tm:sec set-tm:sec | |
5641 | minutes tm:min set-tm:min | |
5642 | hours tm:hour set-tm:hour | |
5643 | day of the month tm:mday set-tm:mday | |
5644 | month tm:mon set-tm:mon | |
5645 | year tm:year set-tm:year | |
5646 | day of the week tm:wday set-tm:wday | |
5647 | day in the year tm:yday set-tm:yday | |
5648 | daylight saving time tm:isdst set-tm:isdst | |
5649 | GMT offset, seconds tm:gmtoff set-tm:gmtoff | |
5650 | name of time zone tm:zone set-tm:zone | |
5651 | ||
095936d2 JB |
5652 | *** There are new accessors for the vectors returned by `uname', |
5653 | describing the host system: | |
48d224d7 JB |
5654 | |
5655 | Component Accessor | |
5656 | ============================================== ================ | |
5657 | name of the operating system implementation utsname:sysname | |
5658 | network name of this machine utsname:nodename | |
5659 | release level of the operating system utsname:release | |
5660 | version level of the operating system utsname:version | |
5661 | machine hardware platform utsname:machine | |
5662 | ||
095936d2 JB |
5663 | *** There are new accessors for the vectors returned by `getpw', |
5664 | `getpwnam', `getpwuid', and `getpwent', describing entries from the | |
5665 | system's user database: | |
5666 | ||
5667 | Component Accessor | |
5668 | ====================== ================= | |
5669 | user name passwd:name | |
5670 | user password passwd:passwd | |
5671 | user id passwd:uid | |
5672 | group id passwd:gid | |
5673 | real name passwd:gecos | |
5674 | home directory passwd:dir | |
5675 | shell program passwd:shell | |
5676 | ||
5677 | *** There are new accessors for the vectors returned by `getgr', | |
5678 | `getgrnam', `getgrgid', and `getgrent', describing entries from the | |
5679 | system's group database: | |
5680 | ||
5681 | Component Accessor | |
5682 | ======================= ============ | |
5683 | group name group:name | |
5684 | group password group:passwd | |
5685 | group id group:gid | |
5686 | group members group:mem | |
5687 | ||
5688 | *** There are new accessors for the vectors returned by `gethost', | |
5689 | `gethostbyaddr', `gethostbyname', and `gethostent', describing | |
5690 | internet hosts: | |
5691 | ||
5692 | Component Accessor | |
5693 | ========================= =============== | |
5694 | official name of host hostent:name | |
5695 | alias list hostent:aliases | |
5696 | host address type hostent:addrtype | |
5697 | length of address hostent:length | |
5698 | list of addresses hostent:addr-list | |
5699 | ||
5700 | *** There are new accessors for the vectors returned by `getnet', | |
5701 | `getnetbyaddr', `getnetbyname', and `getnetent', describing internet | |
5702 | networks: | |
5703 | ||
5704 | Component Accessor | |
5705 | ========================= =============== | |
5706 | official name of net netent:name | |
5707 | alias list netent:aliases | |
5708 | net number type netent:addrtype | |
5709 | net number netent:net | |
5710 | ||
5711 | *** There are new accessors for the vectors returned by `getproto', | |
5712 | `getprotobyname', `getprotobynumber', and `getprotoent', describing | |
5713 | internet protocols: | |
5714 | ||
5715 | Component Accessor | |
5716 | ========================= =============== | |
5717 | official protocol name protoent:name | |
5718 | alias list protoent:aliases | |
5719 | protocol number protoent:proto | |
5720 | ||
5721 | *** There are new accessors for the vectors returned by `getserv', | |
5722 | `getservbyname', `getservbyport', and `getservent', describing | |
5723 | internet protocols: | |
5724 | ||
5725 | Component Accessor | |
5726 | ========================= =============== | |
6c0201ad | 5727 | official service name servent:name |
095936d2 | 5728 | alias list servent:aliases |
6c0201ad TTN |
5729 | port number servent:port |
5730 | protocol to use servent:proto | |
095936d2 JB |
5731 | |
5732 | *** There are new accessors for the sockaddr structures returned by | |
5733 | `accept', `getsockname', `getpeername', `recvfrom!': | |
5734 | ||
5735 | Component Accessor | |
5736 | ======================================== =============== | |
6c0201ad | 5737 | address format (`family') sockaddr:fam |
095936d2 JB |
5738 | path, for file domain addresses sockaddr:path |
5739 | address, for internet domain addresses sockaddr:addr | |
5740 | TCP or UDP port, for internet sockaddr:port | |
5741 | ||
5742 | *** The `getpwent', `getgrent', `gethostent', `getnetent', | |
5743 | `getprotoent', and `getservent' functions now return #f at the end of | |
5744 | the user database. (They used to throw an exception.) | |
5745 | ||
5746 | Note that calling MUMBLEent function is equivalent to calling the | |
5747 | corresponding MUMBLE function with no arguments. | |
5748 | ||
5749 | *** The `setpwent', `setgrent', `sethostent', `setnetent', | |
5750 | `setprotoent', and `setservent' routines now take no arguments. | |
5751 | ||
5752 | *** The `gethost', `getproto', `getnet', and `getserv' functions now | |
5753 | provide more useful information when they throw an exception. | |
5754 | ||
5755 | *** The `lnaof' function has been renamed to `inet-lnaof'. | |
5756 | ||
5757 | *** Guile now claims to have the `current-time' feature. | |
5758 | ||
5759 | *** The `mktime' function now takes an optional second argument ZONE, | |
5760 | giving the time zone to use for the conversion. ZONE should be a | |
5761 | string, in the same format as expected for the "TZ" environment variable. | |
5762 | ||
5763 | *** The `strptime' function now returns a pair (TIME . COUNT), where | |
5764 | TIME is the parsed time as a vector, and COUNT is the number of | |
5765 | characters from the string left unparsed. This function used to | |
5766 | return the remaining characters as a string. | |
5767 | ||
5768 | *** The `gettimeofday' function has replaced the old `time+ticks' function. | |
5769 | The return value is now (SECONDS . MICROSECONDS); the fractional | |
5770 | component is no longer expressed in "ticks". | |
5771 | ||
5772 | *** The `ticks/sec' constant has been removed, in light of the above change. | |
6685dc83 | 5773 | |
ea00ecba MG |
5774 | * Changes to the gh_ interface |
5775 | ||
5776 | ** gh_eval_str() now returns an SCM object which is the result of the | |
5777 | evaluation | |
5778 | ||
aaef0d2a MG |
5779 | ** gh_scm2str() now copies the Scheme data to a caller-provided C |
5780 | array | |
5781 | ||
5782 | ** gh_scm2newstr() now makes a C array, copies the Scheme data to it, | |
5783 | and returns the array | |
5784 | ||
5785 | ** gh_scm2str0() is gone: there is no need to distinguish | |
5786 | null-terminated from non-null-terminated, since gh_scm2newstr() allows | |
5787 | the user to interpret the data both ways. | |
5788 | ||
f3b1485f JB |
5789 | * Changes to the scm_ interface |
5790 | ||
095936d2 JB |
5791 | ** The new function scm_symbol_value0 provides an easy way to get a |
5792 | symbol's value from C code: | |
5793 | ||
5794 | SCM scm_symbol_value0 (char *NAME) | |
5795 | Return the value of the symbol named by the null-terminated string | |
5796 | NAME in the current module. If the symbol named NAME is unbound in | |
5797 | the current module, return SCM_UNDEFINED. | |
5798 | ||
5799 | ** The new function scm_sysintern0 creates new top-level variables, | |
5800 | without assigning them a value. | |
5801 | ||
5802 | SCM scm_sysintern0 (char *NAME) | |
5803 | Create a new Scheme top-level variable named NAME. NAME is a | |
5804 | null-terminated string. Return the variable's value cell. | |
5805 | ||
5806 | ** The function scm_internal_catch is the guts of catch. It handles | |
5807 | all the mechanics of setting up a catch target, invoking the catch | |
5808 | body, and perhaps invoking the handler if the body does a throw. | |
5809 | ||
5810 | The function is designed to be usable from C code, but is general | |
5811 | enough to implement all the semantics Guile Scheme expects from throw. | |
5812 | ||
5813 | TAG is the catch tag. Typically, this is a symbol, but this function | |
5814 | doesn't actually care about that. | |
5815 | ||
5816 | BODY is a pointer to a C function which runs the body of the catch; | |
5817 | this is the code you can throw from. We call it like this: | |
5818 | BODY (BODY_DATA, JMPBUF) | |
5819 | where: | |
5820 | BODY_DATA is just the BODY_DATA argument we received; we pass it | |
5821 | through to BODY as its first argument. The caller can make | |
5822 | BODY_DATA point to anything useful that BODY might need. | |
5823 | JMPBUF is the Scheme jmpbuf object corresponding to this catch, | |
5824 | which we have just created and initialized. | |
5825 | ||
5826 | HANDLER is a pointer to a C function to deal with a throw to TAG, | |
5827 | should one occur. We call it like this: | |
5828 | HANDLER (HANDLER_DATA, THROWN_TAG, THROW_ARGS) | |
5829 | where | |
5830 | HANDLER_DATA is the HANDLER_DATA argument we recevied; it's the | |
5831 | same idea as BODY_DATA above. | |
5832 | THROWN_TAG is the tag that the user threw to; usually this is | |
5833 | TAG, but it could be something else if TAG was #t (i.e., a | |
5834 | catch-all), or the user threw to a jmpbuf. | |
5835 | THROW_ARGS is the list of arguments the user passed to the THROW | |
5836 | function. | |
5837 | ||
5838 | BODY_DATA is just a pointer we pass through to BODY. HANDLER_DATA | |
5839 | is just a pointer we pass through to HANDLER. We don't actually | |
5840 | use either of those pointers otherwise ourselves. The idea is | |
5841 | that, if our caller wants to communicate something to BODY or | |
5842 | HANDLER, it can pass a pointer to it as MUMBLE_DATA, which BODY and | |
5843 | HANDLER can then use. Think of it as a way to make BODY and | |
5844 | HANDLER closures, not just functions; MUMBLE_DATA points to the | |
5845 | enclosed variables. | |
5846 | ||
5847 | Of course, it's up to the caller to make sure that any data a | |
5848 | MUMBLE_DATA needs is protected from GC. A common way to do this is | |
5849 | to make MUMBLE_DATA a pointer to data stored in an automatic | |
5850 | structure variable; since the collector must scan the stack for | |
5851 | references anyway, this assures that any references in MUMBLE_DATA | |
5852 | will be found. | |
5853 | ||
5854 | ** The new function scm_internal_lazy_catch is exactly like | |
5855 | scm_internal_catch, except: | |
5856 | ||
5857 | - It does not unwind the stack (this is the major difference). | |
5858 | - If handler returns, its value is returned from the throw. | |
5859 | - BODY always receives #f as its JMPBUF argument (since there's no | |
5860 | jmpbuf associated with a lazy catch, because we don't unwind the | |
5861 | stack.) | |
5862 | ||
5863 | ** scm_body_thunk is a new body function you can pass to | |
5864 | scm_internal_catch if you want the body to be like Scheme's `catch' | |
5865 | --- a thunk, or a function of one argument if the tag is #f. | |
5866 | ||
5867 | BODY_DATA is a pointer to a scm_body_thunk_data structure, which | |
5868 | contains the Scheme procedure to invoke as the body, and the tag | |
5869 | we're catching. If the tag is #f, then we pass JMPBUF (created by | |
5870 | scm_internal_catch) to the body procedure; otherwise, the body gets | |
5871 | no arguments. | |
5872 | ||
5873 | ** scm_handle_by_proc is a new handler function you can pass to | |
5874 | scm_internal_catch if you want the handler to act like Scheme's catch | |
5875 | --- call a procedure with the tag and the throw arguments. | |
5876 | ||
5877 | If the user does a throw to this catch, this function runs a handler | |
5878 | procedure written in Scheme. HANDLER_DATA is a pointer to an SCM | |
5879 | variable holding the Scheme procedure object to invoke. It ought to | |
5880 | be a pointer to an automatic variable (i.e., one living on the stack), | |
5881 | or the procedure object should be otherwise protected from GC. | |
5882 | ||
5883 | ** scm_handle_by_message is a new handler function to use with | |
5884 | `scm_internal_catch' if you want Guile to print a message and die. | |
5885 | It's useful for dealing with throws to uncaught keys at the top level. | |
5886 | ||
5887 | HANDLER_DATA, if non-zero, is assumed to be a char * pointing to a | |
5888 | message header to print; if zero, we use "guile" instead. That | |
5889 | text is followed by a colon, then the message described by ARGS. | |
5890 | ||
5891 | ** The return type of scm_boot_guile is now void; the function does | |
5892 | not return a value, and indeed, never returns at all. | |
5893 | ||
f3b1485f JB |
5894 | ** The new function scm_shell makes it easy for user applications to |
5895 | process command-line arguments in a way that is compatible with the | |
5896 | stand-alone guile interpreter (which is in turn compatible with SCSH, | |
5897 | the Scheme shell). | |
5898 | ||
5899 | To use the scm_shell function, first initialize any guile modules | |
5900 | linked into your application, and then call scm_shell with the values | |
7ed46dc8 | 5901 | of ARGC and ARGV your `main' function received. scm_shell will add |
f3b1485f JB |
5902 | any SCSH-style meta-arguments from the top of the script file to the |
5903 | argument vector, and then process the command-line arguments. This | |
5904 | generally means loading a script file or starting up an interactive | |
5905 | command interpreter. For details, see "Changes to the stand-alone | |
5906 | interpreter" above. | |
5907 | ||
095936d2 | 5908 | ** The new functions scm_get_meta_args and scm_count_argv help you |
6c0201ad | 5909 | implement the SCSH-style meta-argument, `\'. |
095936d2 JB |
5910 | |
5911 | char **scm_get_meta_args (int ARGC, char **ARGV) | |
5912 | If the second element of ARGV is a string consisting of a single | |
5913 | backslash character (i.e. "\\" in Scheme notation), open the file | |
5914 | named by the following argument, parse arguments from it, and return | |
5915 | the spliced command line. The returned array is terminated by a | |
5916 | null pointer. | |
6c0201ad | 5917 | |
095936d2 JB |
5918 | For details of argument parsing, see above, under "guile now accepts |
5919 | command-line arguments compatible with SCSH..." | |
5920 | ||
5921 | int scm_count_argv (char **ARGV) | |
5922 | Count the arguments in ARGV, assuming it is terminated by a null | |
5923 | pointer. | |
5924 | ||
5925 | For an example of how these functions might be used, see the source | |
5926 | code for the function scm_shell in libguile/script.c. | |
5927 | ||
5928 | You will usually want to use scm_shell instead of calling this | |
5929 | function yourself. | |
5930 | ||
5931 | ** The new function scm_compile_shell_switches turns an array of | |
5932 | command-line arguments into Scheme code to carry out the actions they | |
5933 | describe. Given ARGC and ARGV, it returns a Scheme expression to | |
5934 | evaluate, and calls scm_set_program_arguments to make any remaining | |
5935 | command-line arguments available to the Scheme code. For example, | |
5936 | given the following arguments: | |
5937 | ||
5938 | -e main -s ekko a speckled gecko | |
5939 | ||
5940 | scm_set_program_arguments will return the following expression: | |
5941 | ||
5942 | (begin (load "ekko") (main (command-line)) (quit)) | |
5943 | ||
5944 | You will usually want to use scm_shell instead of calling this | |
5945 | function yourself. | |
5946 | ||
5947 | ** The function scm_shell_usage prints a usage message appropriate for | |
5948 | an interpreter that uses scm_compile_shell_switches to handle its | |
5949 | command-line arguments. | |
5950 | ||
5951 | void scm_shell_usage (int FATAL, char *MESSAGE) | |
5952 | Print a usage message to the standard error output. If MESSAGE is | |
5953 | non-zero, write it before the usage message, followed by a newline. | |
5954 | If FATAL is non-zero, exit the process, using FATAL as the | |
5955 | termination status. (If you want to be compatible with Guile, | |
5956 | always use 1 as the exit status when terminating due to command-line | |
5957 | usage problems.) | |
5958 | ||
5959 | You will usually want to use scm_shell instead of calling this | |
5960 | function yourself. | |
48d224d7 JB |
5961 | |
5962 | ** scm_eval_0str now returns SCM_UNSPECIFIED if the string contains no | |
095936d2 JB |
5963 | expressions. It used to return SCM_EOL. Earth-shattering. |
5964 | ||
5965 | ** The macros for declaring scheme objects in C code have been | |
5966 | rearranged slightly. They are now: | |
5967 | ||
5968 | SCM_SYMBOL (C_NAME, SCHEME_NAME) | |
5969 | Declare a static SCM variable named C_NAME, and initialize it to | |
5970 | point to the Scheme symbol whose name is SCHEME_NAME. C_NAME should | |
5971 | be a C identifier, and SCHEME_NAME should be a C string. | |
5972 | ||
5973 | SCM_GLOBAL_SYMBOL (C_NAME, SCHEME_NAME) | |
5974 | Just like SCM_SYMBOL, but make C_NAME globally visible. | |
5975 | ||
5976 | SCM_VCELL (C_NAME, SCHEME_NAME) | |
5977 | Create a global variable at the Scheme level named SCHEME_NAME. | |
5978 | Declare a static SCM variable named C_NAME, and initialize it to | |
5979 | point to the Scheme variable's value cell. | |
5980 | ||
5981 | SCM_GLOBAL_VCELL (C_NAME, SCHEME_NAME) | |
5982 | Just like SCM_VCELL, but make C_NAME globally visible. | |
5983 | ||
5984 | The `guile-snarf' script writes initialization code for these macros | |
5985 | to its standard output, given C source code as input. | |
5986 | ||
5987 | The SCM_GLOBAL macro is gone. | |
5988 | ||
5989 | ** The scm_read_line and scm_read_line_x functions have been replaced | |
5990 | by Scheme code based on the %read-delimited! procedure (known to C | |
5991 | code as scm_read_delimited_x). See its description above for more | |
5992 | information. | |
48d224d7 | 5993 | |
095936d2 JB |
5994 | ** The function scm_sys_open has been renamed to scm_open. It now |
5995 | returns a port instead of an FD object. | |
ea00ecba | 5996 | |
095936d2 JB |
5997 | * The dynamic linking support has changed. For more information, see |
5998 | libguile/DYNAMIC-LINKING. | |
ea00ecba | 5999 | |
f7b47737 JB |
6000 | \f |
6001 | Guile 1.0b3 | |
3065a62a | 6002 | |
f3b1485f JB |
6003 | User-visible changes from Thursday, September 5, 1996 until Guile 1.0 |
6004 | (Sun 5 Jan 1997): | |
3065a62a | 6005 | |
4b521edb | 6006 | * Changes to the 'guile' program: |
3065a62a | 6007 | |
4b521edb JB |
6008 | ** Guile now loads some new files when it starts up. Guile first |
6009 | searches the load path for init.scm, and loads it if found. Then, if | |
6010 | Guile is not being used to execute a script, and the user's home | |
6011 | directory contains a file named `.guile', Guile loads that. | |
c6486f8a | 6012 | |
4b521edb | 6013 | ** You can now use Guile as a shell script interpreter. |
3065a62a JB |
6014 | |
6015 | To paraphrase the SCSH manual: | |
6016 | ||
6017 | When Unix tries to execute an executable file whose first two | |
6018 | characters are the `#!', it treats the file not as machine code to | |
6019 | be directly executed by the native processor, but as source code | |
6020 | to be executed by some interpreter. The interpreter to use is | |
6021 | specified immediately after the #! sequence on the first line of | |
6022 | the source file. The kernel reads in the name of the interpreter, | |
6023 | and executes that instead. It passes the interpreter the source | |
6024 | filename as its first argument, with the original arguments | |
6025 | following. Consult the Unix man page for the `exec' system call | |
6026 | for more information. | |
6027 | ||
1a1945be JB |
6028 | Now you can use Guile as an interpreter, using a mechanism which is a |
6029 | compatible subset of that provided by SCSH. | |
6030 | ||
3065a62a JB |
6031 | Guile now recognizes a '-s' command line switch, whose argument is the |
6032 | name of a file of Scheme code to load. It also treats the two | |
6033 | characters `#!' as the start of a comment, terminated by `!#'. Thus, | |
6034 | to make a file of Scheme code directly executable by Unix, insert the | |
6035 | following two lines at the top of the file: | |
6036 | ||
6037 | #!/usr/local/bin/guile -s | |
6038 | !# | |
6039 | ||
6040 | Guile treats the argument of the `-s' command-line switch as the name | |
6041 | of a file of Scheme code to load, and treats the sequence `#!' as the | |
6042 | start of a block comment, terminated by `!#'. | |
6043 | ||
6044 | For example, here's a version of 'echo' written in Scheme: | |
6045 | ||
6046 | #!/usr/local/bin/guile -s | |
6047 | !# | |
6048 | (let loop ((args (cdr (program-arguments)))) | |
6049 | (if (pair? args) | |
6050 | (begin | |
6051 | (display (car args)) | |
6052 | (if (pair? (cdr args)) | |
6053 | (display " ")) | |
6054 | (loop (cdr args))))) | |
6055 | (newline) | |
6056 | ||
6057 | Why does `#!' start a block comment terminated by `!#', instead of the | |
6058 | end of the line? That is the notation SCSH uses, and although we | |
6059 | don't yet support the other SCSH features that motivate that choice, | |
6060 | we would like to be backward-compatible with any existing Guile | |
3763761c JB |
6061 | scripts once we do. Furthermore, if the path to Guile on your system |
6062 | is too long for your kernel, you can start the script with this | |
6063 | horrible hack: | |
6064 | ||
6065 | #!/bin/sh | |
6066 | exec /really/long/path/to/guile -s "$0" ${1+"$@"} | |
6067 | !# | |
3065a62a JB |
6068 | |
6069 | Note that some very old Unix systems don't support the `#!' syntax. | |
6070 | ||
c6486f8a | 6071 | |
4b521edb | 6072 | ** You can now run Guile without installing it. |
6685dc83 JB |
6073 | |
6074 | Previous versions of the interactive Guile interpreter (`guile') | |
6075 | couldn't start up unless Guile's Scheme library had been installed; | |
6076 | they used the value of the environment variable `SCHEME_LOAD_PATH' | |
6077 | later on in the startup process, but not to find the startup code | |
6078 | itself. Now Guile uses `SCHEME_LOAD_PATH' in all searches for Scheme | |
6079 | code. | |
6080 | ||
6081 | To run Guile without installing it, build it in the normal way, and | |
6082 | then set the environment variable `SCHEME_LOAD_PATH' to a | |
6083 | colon-separated list of directories, including the top-level directory | |
6084 | of the Guile sources. For example, if you unpacked Guile so that the | |
6085 | full filename of this NEWS file is /home/jimb/guile-1.0b3/NEWS, then | |
6086 | you might say | |
6087 | ||
6088 | export SCHEME_LOAD_PATH=/home/jimb/my-scheme:/home/jimb/guile-1.0b3 | |
6089 | ||
c6486f8a | 6090 | |
4b521edb JB |
6091 | ** Guile's read-eval-print loop no longer prints #<unspecified> |
6092 | results. If the user wants to see this, she can evaluate the | |
6093 | expression (assert-repl-print-unspecified #t), perhaps in her startup | |
48d224d7 | 6094 | file. |
6685dc83 | 6095 | |
4b521edb JB |
6096 | ** Guile no longer shows backtraces by default when an error occurs; |
6097 | however, it does display a message saying how to get one, and how to | |
6098 | request that they be displayed by default. After an error, evaluate | |
6099 | (backtrace) | |
6100 | to see a backtrace, and | |
6101 | (debug-enable 'backtrace) | |
6102 | to see them by default. | |
6685dc83 | 6103 | |
6685dc83 | 6104 | |
d9fb83d9 | 6105 | |
4b521edb JB |
6106 | * Changes to Guile Scheme: |
6107 | ||
6108 | ** Guile now distinguishes between #f and the empty list. | |
6109 | ||
6110 | This is for compatibility with the IEEE standard, the (possibly) | |
6111 | upcoming Revised^5 Report on Scheme, and many extant Scheme | |
6112 | implementations. | |
6113 | ||
6114 | Guile used to have #f and '() denote the same object, to make Scheme's | |
6115 | type system more compatible with Emacs Lisp's. However, the change | |
6116 | caused too much trouble for Scheme programmers, and we found another | |
6117 | way to reconcile Emacs Lisp with Scheme that didn't require this. | |
6118 | ||
6119 | ||
6120 | ** Guile's delq, delv, delete functions, and their destructive | |
c6486f8a JB |
6121 | counterparts, delq!, delv!, and delete!, now remove all matching |
6122 | elements from the list, not just the first. This matches the behavior | |
6123 | of the corresponding Emacs Lisp functions, and (I believe) the Maclisp | |
6124 | functions which inspired them. | |
6125 | ||
6126 | I recognize that this change may break code in subtle ways, but it | |
6127 | seems best to make the change before the FSF's first Guile release, | |
6128 | rather than after. | |
6129 | ||
6130 | ||
4b521edb | 6131 | ** The compiled-library-path function has been deleted from libguile. |
6685dc83 | 6132 | |
4b521edb | 6133 | ** The facilities for loading Scheme source files have changed. |
c6486f8a | 6134 | |
4b521edb | 6135 | *** The variable %load-path now tells Guile which directories to search |
6685dc83 JB |
6136 | for Scheme code. Its value is a list of strings, each of which names |
6137 | a directory. | |
6138 | ||
4b521edb JB |
6139 | *** The variable %load-extensions now tells Guile which extensions to |
6140 | try appending to a filename when searching the load path. Its value | |
6141 | is a list of strings. Its default value is ("" ".scm"). | |
6142 | ||
6143 | *** (%search-load-path FILENAME) searches the directories listed in the | |
6144 | value of the %load-path variable for a Scheme file named FILENAME, | |
6145 | with all the extensions listed in %load-extensions. If it finds a | |
6146 | match, then it returns its full filename. If FILENAME is absolute, it | |
6147 | returns it unchanged. Otherwise, it returns #f. | |
6685dc83 | 6148 | |
4b521edb JB |
6149 | %search-load-path will not return matches that refer to directories. |
6150 | ||
6151 | *** (primitive-load FILENAME :optional CASE-INSENSITIVE-P SHARP) | |
6152 | uses %seach-load-path to find a file named FILENAME, and loads it if | |
6153 | it finds it. If it can't read FILENAME for any reason, it throws an | |
6154 | error. | |
6685dc83 JB |
6155 | |
6156 | The arguments CASE-INSENSITIVE-P and SHARP are interpreted as by the | |
4b521edb JB |
6157 | `read' function. |
6158 | ||
6159 | *** load uses the same searching semantics as primitive-load. | |
6160 | ||
6161 | *** The functions %try-load, try-load-with-path, %load, load-with-path, | |
6162 | basic-try-load-with-path, basic-load-with-path, try-load-module-with- | |
6163 | path, and load-module-with-path have been deleted. The functions | |
6164 | above should serve their purposes. | |
6165 | ||
6166 | *** If the value of the variable %load-hook is a procedure, | |
6167 | `primitive-load' applies its value to the name of the file being | |
6168 | loaded (without the load path directory name prepended). If its value | |
6169 | is #f, it is ignored. Otherwise, an error occurs. | |
6170 | ||
6171 | This is mostly useful for printing load notification messages. | |
6172 | ||
6173 | ||
6174 | ** The function `eval!' is no longer accessible from the scheme level. | |
6175 | We can't allow operations which introduce glocs into the scheme level, | |
6176 | because Guile's type system can't handle these as data. Use `eval' or | |
6177 | `read-and-eval!' (see below) as replacement. | |
6178 | ||
6179 | ** The new function read-and-eval! reads an expression from PORT, | |
6180 | evaluates it, and returns the result. This is more efficient than | |
6181 | simply calling `read' and `eval', since it is not necessary to make a | |
6182 | copy of the expression for the evaluator to munge. | |
6183 | ||
6184 | Its optional arguments CASE_INSENSITIVE_P and SHARP are interpreted as | |
6185 | for the `read' function. | |
6186 | ||
6187 | ||
6188 | ** The function `int?' has been removed; its definition was identical | |
6189 | to that of `integer?'. | |
6190 | ||
6191 | ** The functions `<?', `<?', `<=?', `=?', `>?', and `>=?'. Code should | |
6192 | use the R4RS names for these functions. | |
6193 | ||
6194 | ** The function object-properties no longer returns the hash handle; | |
6195 | it simply returns the object's property list. | |
6196 | ||
6197 | ** Many functions have been changed to throw errors, instead of | |
6198 | returning #f on failure. The point of providing exception handling in | |
6199 | the language is to simplify the logic of user code, but this is less | |
6200 | useful if Guile's primitives don't throw exceptions. | |
6201 | ||
6202 | ** The function `fileno' has been renamed from `%fileno'. | |
6203 | ||
6204 | ** The function primitive-mode->fdes returns #t or #f now, not 1 or 0. | |
6205 | ||
6206 | ||
6207 | * Changes to Guile's C interface: | |
6208 | ||
6209 | ** The library's initialization procedure has been simplified. | |
6210 | scm_boot_guile now has the prototype: | |
6211 | ||
6212 | void scm_boot_guile (int ARGC, | |
6213 | char **ARGV, | |
6214 | void (*main_func) (), | |
6215 | void *closure); | |
6216 | ||
6217 | scm_boot_guile calls MAIN_FUNC, passing it CLOSURE, ARGC, and ARGV. | |
6218 | MAIN_FUNC should do all the work of the program (initializing other | |
6219 | packages, reading user input, etc.) before returning. When MAIN_FUNC | |
6220 | returns, call exit (0); this function never returns. If you want some | |
6221 | other exit value, MAIN_FUNC may call exit itself. | |
6222 | ||
6223 | scm_boot_guile arranges for program-arguments to return the strings | |
6224 | given by ARGC and ARGV. If MAIN_FUNC modifies ARGC/ARGV, should call | |
6225 | scm_set_program_arguments with the final list, so Scheme code will | |
6226 | know which arguments have been processed. | |
6227 | ||
6228 | scm_boot_guile establishes a catch-all catch handler which prints an | |
6229 | error message and exits the process. This means that Guile exits in a | |
6230 | coherent way when system errors occur and the user isn't prepared to | |
6231 | handle it. If the user doesn't like this behavior, they can establish | |
6232 | their own universal catcher in MAIN_FUNC to shadow this one. | |
6233 | ||
6234 | Why must the caller do all the real work from MAIN_FUNC? The garbage | |
6235 | collector assumes that all local variables of type SCM will be above | |
6236 | scm_boot_guile's stack frame on the stack. If you try to manipulate | |
6237 | SCM values after this function returns, it's the luck of the draw | |
6238 | whether the GC will be able to find the objects you allocate. So, | |
6239 | scm_boot_guile function exits, rather than returning, to discourage | |
6240 | people from making that mistake. | |
6241 | ||
6242 | The IN, OUT, and ERR arguments were removed; there are other | |
6243 | convenient ways to override these when desired. | |
6244 | ||
6245 | The RESULT argument was deleted; this function should never return. | |
6246 | ||
6247 | The BOOT_CMD argument was deleted; the MAIN_FUNC argument is more | |
6248 | general. | |
6249 | ||
6250 | ||
6251 | ** Guile's header files should no longer conflict with your system's | |
6252 | header files. | |
6253 | ||
6254 | In order to compile code which #included <libguile.h>, previous | |
6255 | versions of Guile required you to add a directory containing all the | |
6256 | Guile header files to your #include path. This was a problem, since | |
6257 | Guile's header files have names which conflict with many systems' | |
6258 | header files. | |
6259 | ||
6260 | Now only <libguile.h> need appear in your #include path; you must | |
6261 | refer to all Guile's other header files as <libguile/mumble.h>. | |
6262 | Guile's installation procedure puts libguile.h in $(includedir), and | |
6263 | the rest in $(includedir)/libguile. | |
6264 | ||
6265 | ||
6266 | ** Two new C functions, scm_protect_object and scm_unprotect_object, | |
6267 | have been added to the Guile library. | |
6268 | ||
6269 | scm_protect_object (OBJ) protects OBJ from the garbage collector. | |
6270 | OBJ will not be freed, even if all other references are dropped, | |
6271 | until someone does scm_unprotect_object (OBJ). Both functions | |
6272 | return OBJ. | |
6273 | ||
6274 | Note that calls to scm_protect_object do not nest. You can call | |
6275 | scm_protect_object any number of times on a given object, and the | |
6276 | next call to scm_unprotect_object will unprotect it completely. | |
6277 | ||
6278 | Basically, scm_protect_object and scm_unprotect_object just | |
6279 | maintain a list of references to things. Since the GC knows about | |
6280 | this list, all objects it mentions stay alive. scm_protect_object | |
6281 | adds its argument to the list; scm_unprotect_object remove its | |
6282 | argument from the list. | |
6283 | ||
6284 | ||
6285 | ** scm_eval_0str now returns the value of the last expression | |
6286 | evaluated. | |
6287 | ||
6288 | ** The new function scm_read_0str reads an s-expression from a | |
6289 | null-terminated string, and returns it. | |
6290 | ||
6291 | ** The new function `scm_stdio_to_port' converts a STDIO file pointer | |
6292 | to a Scheme port object. | |
6293 | ||
6294 | ** The new function `scm_set_program_arguments' allows C code to set | |
e80c8fea | 6295 | the value returned by the Scheme `program-arguments' function. |
6685dc83 | 6296 | |
6685dc83 | 6297 | \f |
1a1945be JB |
6298 | Older changes: |
6299 | ||
6300 | * Guile no longer includes sophisticated Tcl/Tk support. | |
6301 | ||
6302 | The old Tcl/Tk support was unsatisfying to us, because it required the | |
6303 | user to link against the Tcl library, as well as Tk and Guile. The | |
6304 | interface was also un-lispy, in that it preserved Tcl/Tk's practice of | |
6305 | referring to widgets by names, rather than exporting widgets to Scheme | |
6306 | code as a special datatype. | |
6307 | ||
6308 | In the Usenix Tk Developer's Workshop held in July 1996, the Tcl/Tk | |
6309 | maintainers described some very interesting changes in progress to the | |
6310 | Tcl/Tk internals, which would facilitate clean interfaces between lone | |
6311 | Tk and other interpreters --- even for garbage-collected languages | |
6312 | like Scheme. They expected the new Tk to be publicly available in the | |
6313 | fall of 1996. | |
6314 | ||
6315 | Since it seems that Guile might soon have a new, cleaner interface to | |
6316 | lone Tk, and that the old Guile/Tk glue code would probably need to be | |
6317 | completely rewritten, we (Jim Blandy and Richard Stallman) have | |
6318 | decided not to support the old code. We'll spend the time instead on | |
6319 | a good interface to the newer Tk, as soon as it is available. | |
5c54da76 | 6320 | |
8512dea6 | 6321 | Until then, gtcltk-lib provides trivial, low-maintenance functionality. |
deb95d71 | 6322 | |
5c54da76 JB |
6323 | \f |
6324 | Copyright information: | |
6325 | ||
7e267da1 | 6326 | Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
5c54da76 JB |
6327 | |
6328 | Permission is granted to anyone to make or distribute verbatim copies | |
6329 | of this document as received, in any medium, provided that the | |
6330 | copyright notice and this permission notice are preserved, | |
6331 | thus giving the recipient permission to redistribute in turn. | |
6332 | ||
6333 | Permission is granted to distribute modified versions | |
6334 | of this document, or of portions of it, | |
6335 | under the above conditions, provided also that they | |
6336 | carry prominent notices stating who last changed them. | |
6337 | ||
48d224d7 JB |
6338 | \f |
6339 | Local variables: | |
6340 | mode: outline | |
6341 | paragraph-separate: "[ \f]*$" | |
6342 | end: | |
6343 |