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1ab256cb RM |
1 | /* Buffer manipulation primitives for GNU Emacs. |
2 | Copyright (C) 1985, 1986, 1987, 1988, 1989 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | #include <sys/param.h> | |
22 | ||
23 | #ifndef MAXPATHLEN | |
24 | /* in 4.1, param.h fails to define this. */ | |
25 | #define MAXPATHLEN 1024 | |
26 | #endif /* not MAXPATHLEN */ | |
27 | ||
28 | #ifdef NULL | |
29 | #undef NULL | |
30 | #endif | |
31 | #include "config.h" | |
32 | #include "lisp.h" | |
33 | #include "window.h" | |
34 | #include "commands.h" | |
35 | #include "buffer.h" | |
36 | #include "syntax.h" | |
37 | #include "indent.h" | |
38 | ||
39 | struct buffer *current_buffer; /* the current buffer */ | |
40 | ||
41 | /* First buffer in chain of all buffers (in reverse order of creation). | |
42 | Threaded through ->next. */ | |
43 | ||
44 | struct buffer *all_buffers; | |
45 | ||
46 | /* This structure holds the default values of the buffer-local variables | |
47 | defined with DEFVAR_PER_BUFFER, that have special slots in each buffer. | |
48 | The default value occupies the same slot in this structure | |
49 | as an individual buffer's value occupies in that buffer. | |
50 | Setting the default value also goes through the alist of buffers | |
51 | and stores into each buffer that does not say it has a local value. */ | |
52 | ||
53 | struct buffer buffer_defaults; | |
54 | ||
55 | /* A Lisp_Object pointer to the above, used for staticpro */ | |
56 | ||
57 | static Lisp_Object Vbuffer_defaults; | |
58 | ||
59 | /* This structure marks which slots in a buffer have corresponding | |
60 | default values in buffer_defaults. | |
61 | Each such slot has a nonzero value in this structure. | |
62 | The value has only one nonzero bit. | |
63 | ||
64 | When a buffer has its own local value for a slot, | |
65 | the bit for that slot (found in the same slot in this structure) | |
66 | is turned on in the buffer's local_var_flags slot. | |
67 | ||
68 | If a slot in this structure is -1, then even though there may | |
69 | be a DEFVAR_PER_BUFFER for the slot, there is no default value for it; | |
70 | and the corresponding slot in buffer_defaults is not used. | |
71 | ||
72 | If a slot is -2, then there is no DEFVAR_PER_BUFFER for it, | |
73 | but there is a default value which is copied into each buffer. | |
74 | ||
75 | If a slot in this structure is negative, then even though there may | |
76 | be a DEFVAR_PER_BUFFER for the slot, there is no default value for it; | |
77 | and the corresponding slot in buffer_defaults is not used. | |
78 | ||
79 | If a slot in this structure corresponding to a DEFVAR_PER_BUFFER is | |
80 | zero, that is a bug */ | |
81 | ||
82 | struct buffer buffer_local_flags; | |
83 | ||
84 | /* This structure holds the names of symbols whose values may be | |
85 | buffer-local. It is indexed and accessed in the same way as the above. */ | |
86 | ||
87 | struct buffer buffer_local_symbols; | |
88 | /* A Lisp_Object pointer to the above, used for staticpro */ | |
89 | static Lisp_Object Vbuffer_local_symbols; | |
90 | ||
91 | /* Nonzero means don't allow modification of protected fields. */ | |
92 | ||
93 | int check_protected_fields; | |
94 | ||
95 | Lisp_Object Fset_buffer (); | |
96 | ||
97 | /* Alist of all buffer names vs the buffers. */ | |
98 | /* This used to be a variable, but is no longer, | |
99 | to prevent lossage due to user rplac'ing this alist or its elements. */ | |
100 | Lisp_Object Vbuffer_alist; | |
101 | ||
102 | /* Functions to call before and after each text change. */ | |
103 | Lisp_Object Vbefore_change_function; | |
104 | Lisp_Object Vafter_change_function; | |
105 | ||
106 | /* Function to call before changing an unmodified buffer. */ | |
107 | Lisp_Object Vfirst_change_function; | |
108 | ||
109 | Lisp_Object Qfundamental_mode, Qmode_class, Qpermanent_local; | |
110 | ||
111 | Lisp_Object Qprotected_field; | |
112 | ||
113 | Lisp_Object QSFundamental; /* A string "Fundamental" */ | |
114 | ||
115 | Lisp_Object Qkill_buffer_hook; | |
116 | ||
117 | /* For debugging; temporary. See set_buffer_internal. */ | |
118 | /* Lisp_Object Qlisp_mode, Vcheck_symbol; */ | |
119 | ||
120 | nsberror (spec) | |
121 | Lisp_Object spec; | |
122 | { | |
123 | if (XTYPE (spec) == Lisp_String) | |
124 | error ("No buffer named %s", XSTRING (spec)->data); | |
125 | error ("Invalid buffer argument"); | |
126 | } | |
127 | \f | |
128 | DEFUN ("buffer-list", Fbuffer_list, Sbuffer_list, 0, 0, 0, | |
129 | "Return a list of all existing live buffers.") | |
130 | () | |
131 | { | |
132 | return Fmapcar (Qcdr, Vbuffer_alist); | |
133 | } | |
134 | ||
135 | DEFUN ("get-buffer", Fget_buffer, Sget_buffer, 1, 1, 0, | |
136 | "Return the buffer named NAME (a string).\n\ | |
137 | If there is no live buffer named NAME, return nil.\n\ | |
138 | NAME may also be a buffer; if so, the value is that buffer.") | |
139 | (name) | |
140 | register Lisp_Object name; | |
141 | { | |
142 | if (XTYPE (name) == Lisp_Buffer) | |
143 | return name; | |
144 | CHECK_STRING (name, 0); | |
145 | ||
146 | return Fcdr (Fassoc (name, Vbuffer_alist)); | |
147 | } | |
148 | ||
149 | DEFUN ("get-file-buffer", Fget_file_buffer, Sget_file_buffer, 1, 1, 0, | |
150 | "Return the buffer visiting file FILENAME (a string).\n\ | |
151 | If there is no such live buffer, return nil.") | |
152 | (filename) | |
153 | register Lisp_Object filename; | |
154 | { | |
155 | register Lisp_Object tail, buf, tem; | |
156 | CHECK_STRING (filename, 0); | |
157 | filename = Fexpand_file_name (filename, Qnil); | |
158 | ||
159 | for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr) | |
160 | { | |
161 | buf = Fcdr (XCONS (tail)->car); | |
162 | if (XTYPE (buf) != Lisp_Buffer) continue; | |
163 | if (XTYPE (XBUFFER (buf)->filename) != Lisp_String) continue; | |
164 | tem = Fstring_equal (XBUFFER (buf)->filename, filename); | |
165 | if (!NULL (tem)) | |
166 | return buf; | |
167 | } | |
168 | return Qnil; | |
169 | } | |
170 | ||
171 | /* Incremented for each buffer created, to assign the buffer number. */ | |
172 | int buffer_count; | |
173 | ||
174 | DEFUN ("get-buffer-create", Fget_buffer_create, Sget_buffer_create, 1, 1, 0, | |
175 | "Return the buffer named NAME, or create such a buffer and return it.\n\ | |
176 | A new buffer is created if there is no live buffer named NAME.\n\ | |
177 | If NAME is a buffer instead of a string, then it is the value returned.\n\ | |
178 | The value is never nil.") | |
179 | (name) | |
180 | register Lisp_Object name; | |
181 | { | |
182 | register Lisp_Object buf, function, tem; | |
183 | int count = specpdl_ptr - specpdl; | |
184 | register struct buffer *b; | |
185 | ||
186 | buf = Fget_buffer (name); | |
187 | if (!NULL (buf)) | |
188 | return buf; | |
189 | ||
190 | b = (struct buffer *) malloc (sizeof (struct buffer)); | |
191 | if (!b) | |
192 | memory_full (); | |
193 | ||
194 | BUF_GAP_SIZE (b) = 20; | |
195 | BUFFER_ALLOC (BUF_BEG_ADDR (b), BUF_GAP_SIZE (b)); | |
196 | if (! BUF_BEG_ADDR (b)) | |
197 | memory_full (); | |
198 | ||
199 | BUF_PT (b) = 1; | |
200 | BUF_GPT (b) = 1; | |
201 | BUF_BEGV (b) = 1; | |
202 | BUF_ZV (b) = 1; | |
203 | BUF_Z (b) = 1; | |
204 | BUF_MODIFF (b) = 1; | |
205 | ||
206 | /* Put this on the chain of all buffers including killed ones. */ | |
207 | b->next = all_buffers; | |
208 | all_buffers = b; | |
209 | ||
210 | b->mark = Fmake_marker (); | |
211 | /*b->number = make_number (++buffer_count);*/ | |
212 | b->name = name; | |
213 | if (XSTRING (name)->data[0] != ' ') | |
214 | b->undo_list = Qnil; | |
215 | else | |
216 | b->undo_list = Qt; | |
217 | ||
218 | reset_buffer (b); | |
219 | ||
220 | /* Put this in the alist of all live buffers. */ | |
221 | XSET (buf, Lisp_Buffer, b); | |
222 | Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buf), Qnil)); | |
223 | ||
224 | b->mark = Fmake_marker (); | |
225 | b->markers = Qnil; | |
226 | b->name = name; | |
227 | ||
228 | function = buffer_defaults.major_mode; | |
229 | if (NULL (function)) | |
230 | { | |
231 | tem = Fget (current_buffer->major_mode, Qmode_class); | |
232 | if (EQ (tem, Qnil)) | |
233 | function = current_buffer->major_mode; | |
234 | } | |
235 | ||
236 | if (NULL (function) || EQ (function, Qfundamental_mode)) | |
237 | return buf; | |
238 | ||
239 | /* To select a nonfundamental mode, | |
240 | select the buffer temporarily and then call the mode function. */ | |
241 | ||
242 | record_unwind_protect (save_excursion_restore, save_excursion_save ()); | |
243 | ||
244 | Fset_buffer (buf); | |
245 | call0 (function); | |
246 | ||
247 | return unbind_to (count, buf); | |
248 | } | |
249 | ||
250 | /* Reinitialize everything about a buffer except its name and contents. */ | |
251 | ||
252 | void | |
253 | reset_buffer (b) | |
254 | register struct buffer *b; | |
255 | { | |
256 | b->filename = Qnil; | |
257 | b->directory = (current_buffer) ? current_buffer->directory : Qnil; | |
258 | b->modtime = 0; | |
259 | b->save_modified = 1; | |
260 | b->save_length = 0; | |
261 | b->last_window_start = 1; | |
262 | b->backed_up = Qnil; | |
263 | b->auto_save_modified = 0; | |
264 | b->auto_save_file_name = Qnil; | |
265 | b->read_only = Qnil; | |
266 | b->fieldlist = Qnil; | |
267 | reset_buffer_local_variables(b); | |
268 | } | |
269 | ||
270 | reset_buffer_local_variables(b) | |
271 | register struct buffer *b; | |
272 | { | |
273 | register int offset; | |
274 | ||
275 | /* Reset the major mode to Fundamental, together with all the | |
276 | things that depend on the major mode. | |
277 | default-major-mode is handled at a higher level. | |
278 | We ignore it here. */ | |
279 | b->major_mode = Qfundamental_mode; | |
280 | b->keymap = Qnil; | |
281 | b->abbrev_table = Vfundamental_mode_abbrev_table; | |
282 | b->mode_name = QSFundamental; | |
283 | b->minor_modes = Qnil; | |
284 | b->downcase_table = Vascii_downcase_table; | |
285 | b->upcase_table = Vascii_upcase_table; | |
286 | b->case_canon_table = Vascii_downcase_table; | |
287 | b->case_eqv_table = Vascii_upcase_table; | |
288 | #if 0 | |
289 | b->sort_table = XSTRING (Vascii_sort_table); | |
290 | b->folding_sort_table = XSTRING (Vascii_folding_sort_table); | |
291 | #endif /* 0 */ | |
292 | ||
293 | /* Reset all per-buffer variables to their defaults. */ | |
294 | b->local_var_alist = Qnil; | |
295 | b->local_var_flags = 0; | |
296 | ||
297 | /* For each slot that has a default value, | |
298 | copy that into the slot. */ | |
299 | ||
300 | for (offset = (char *)&buffer_local_flags.name - (char *)&buffer_local_flags; | |
301 | offset < sizeof (struct buffer); | |
302 | offset += sizeof (Lisp_Object)) /* sizeof int == sizeof Lisp_Object */ | |
303 | if (*(int *)(offset + (char *) &buffer_local_flags) > 0 | |
304 | || *(int *)(offset + (char *) &buffer_local_flags) == -2) | |
305 | *(Lisp_Object *)(offset + (char *)b) = | |
306 | *(Lisp_Object *)(offset + (char *)&buffer_defaults); | |
307 | } | |
308 | ||
309 | DEFUN ("generate-new-buffer", Fgenerate_new_buffer, Sgenerate_new_buffer, | |
310 | 1, 1, 0, | |
311 | "Create and return a buffer with a name based on NAME.\n\ | |
312 | If there is no live buffer named NAME, then one is created.\n\ | |
313 | Otherwise modify name by appending `<NUMBER>', incrementing NUMBER\n\ | |
314 | until an unused name is found, and then create a buffer.") | |
315 | (name) | |
316 | register Lisp_Object name; | |
317 | { | |
318 | register Lisp_Object gentemp, tem; | |
319 | int count; | |
320 | char number[10]; | |
321 | ||
322 | CHECK_STRING (name, 0); | |
323 | ||
324 | tem = Fget_buffer (name); | |
325 | if (NULL (tem)) | |
326 | return Fget_buffer_create (name); | |
327 | ||
328 | count = 1; | |
329 | while (1) | |
330 | { | |
331 | sprintf (number, "<%d>", ++count); | |
332 | gentemp = concat2 (name, build_string (number)); | |
333 | tem = Fget_buffer (gentemp); | |
334 | if (NULL (tem)) | |
335 | return Fget_buffer_create (gentemp); | |
336 | } | |
337 | } | |
338 | ||
339 | \f | |
340 | DEFUN ("buffer-name", Fbuffer_name, Sbuffer_name, 0, 1, 0, | |
341 | "Return the name of BUFFER, as a string.\n\ | |
342 | Wyth no argument or nil as argument, return the name of the current buffer.") | |
343 | (buffer) | |
344 | register Lisp_Object buffer; | |
345 | { | |
346 | if (NULL (buffer)) | |
347 | return current_buffer->name; | |
348 | CHECK_BUFFER (buffer, 0); | |
349 | return XBUFFER (buffer)->name; | |
350 | } | |
351 | ||
352 | DEFUN ("buffer-file-name", Fbuffer_file_name, Sbuffer_file_name, 0, 1, 0, | |
353 | "Return name of file BUFFER is visiting, or nil if none.\n\ | |
354 | No argument or nil as argument means use the current buffer.") | |
355 | (buffer) | |
356 | register Lisp_Object buffer; | |
357 | { | |
358 | if (NULL (buffer)) | |
359 | return current_buffer->filename; | |
360 | CHECK_BUFFER (buffer, 0); | |
361 | return XBUFFER (buffer)->filename; | |
362 | } | |
363 | ||
364 | DEFUN ("buffer-local-variables", Fbuffer_local_variables, | |
365 | Sbuffer_local_variables, 0, 1, 0, | |
366 | "Return an alist of variables that are buffer-local in BUFFER.\n\ | |
367 | Each element looks like (SYMBOL . VALUE) and describes one variable.\n\ | |
368 | Note that storing new VALUEs in these elements doesn't change the variables.\n\ | |
369 | No argument or nil as argument means use current buffer as BUFFER.") | |
370 | (buffer) | |
371 | register Lisp_Object buffer; | |
372 | { | |
373 | register struct buffer *buf; | |
374 | register Lisp_Object val; | |
375 | ||
376 | if (NULL (buffer)) | |
377 | buf = current_buffer; | |
378 | else | |
379 | { | |
380 | CHECK_BUFFER (buffer, 0); | |
381 | buf = XBUFFER (buffer); | |
382 | } | |
383 | ||
384 | { | |
385 | /* Reference each variable in the alist in our current buffer. | |
386 | If inquiring about the current buffer, this gets the current values, | |
387 | so store them into the alist so the alist is up to date. | |
388 | If inquiring about some other buffer, this swaps out any values | |
389 | for that buffer, making the alist up to date automatically. */ | |
390 | register Lisp_Object tem; | |
391 | for (tem = buf->local_var_alist; CONSP (tem); tem = XCONS (tem)->cdr) | |
392 | { | |
393 | Lisp_Object v1 = Fsymbol_value (XCONS (XCONS (tem)->car)->car); | |
394 | if (buf == current_buffer) | |
395 | XCONS (XCONS (tem)->car)->cdr = v1; | |
396 | } | |
397 | } | |
398 | ||
399 | /* Make a copy of the alist, to return it. */ | |
400 | val = Fcopy_alist (buf->local_var_alist); | |
401 | ||
402 | /* Add on all the variables stored in special slots. */ | |
403 | { | |
404 | register int offset, mask; | |
405 | ||
406 | for (offset = (char *)&buffer_local_symbols.name - (char *)&buffer_local_symbols; | |
407 | offset < sizeof (struct buffer); | |
408 | offset += (sizeof (int))) /* sizeof int == sizeof Lisp_Object */ | |
409 | { | |
410 | mask = *(int *)(offset + (char *) &buffer_local_flags); | |
411 | if (mask == -1 || (buf->local_var_flags & mask)) | |
412 | if (XTYPE (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols)) | |
413 | == Lisp_Symbol) | |
414 | val = Fcons (Fcons (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols), | |
415 | *(Lisp_Object *)(offset + (char *)buf)), | |
416 | val); | |
417 | } | |
418 | } | |
419 | return (val); | |
420 | } | |
421 | ||
422 | \f | |
423 | DEFUN ("buffer-modified-p", Fbuffer_modified_p, Sbuffer_modified_p, | |
424 | 0, 1, 0, | |
425 | "Return t if BUFFER was modified since its file was last read or saved.\n\ | |
426 | No argument or nil as argument means use current buffer as BUFFER.") | |
427 | (buffer) | |
428 | register Lisp_Object buffer; | |
429 | { | |
430 | register struct buffer *buf; | |
431 | if (NULL (buffer)) | |
432 | buf = current_buffer; | |
433 | else | |
434 | { | |
435 | CHECK_BUFFER (buffer, 0); | |
436 | buf = XBUFFER (buffer); | |
437 | } | |
438 | ||
439 | return buf->save_modified < BUF_MODIFF (buf) ? Qt : Qnil; | |
440 | } | |
441 | ||
442 | DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p, | |
443 | 1, 1, 0, | |
444 | "Mark current buffer as modified or unmodified according to FLAG.\n\ | |
445 | A non-nil FLAG means mark the buffer modified.") | |
446 | (flag) | |
447 | register Lisp_Object flag; | |
448 | { | |
449 | register int already; | |
450 | register Lisp_Object fn; | |
451 | ||
452 | #ifdef CLASH_DETECTION | |
453 | /* If buffer becoming modified, lock the file. | |
454 | If buffer becoming unmodified, unlock the file. */ | |
455 | ||
456 | fn = current_buffer->filename; | |
457 | if (!NULL (fn)) | |
458 | { | |
459 | already = current_buffer->save_modified < MODIFF; | |
460 | if (!already && !NULL (flag)) | |
461 | lock_file (fn); | |
462 | else if (already && NULL (flag)) | |
463 | unlock_file (fn); | |
464 | } | |
465 | #endif /* CLASH_DETECTION */ | |
466 | ||
467 | current_buffer->save_modified = NULL (flag) ? MODIFF : 0; | |
468 | update_mode_lines++; | |
469 | return flag; | |
470 | } | |
471 | ||
472 | DEFUN ("buffer-modified-tick", Fbuffer_modified_tick, Sbuffer_modified_tick, | |
473 | 0, 1, 0, | |
474 | "Return BUFFER's tick counter, incremented for each change in text.\n\ | |
475 | Each buffer has a tick counter which is incremented each time the text in\n\ | |
476 | that buffer is changed. It wraps around occasionally.\n\ | |
477 | No argument or nil as argument means use current buffer as BUFFER.") | |
478 | (buffer) | |
479 | register Lisp_Object buffer; | |
480 | { | |
481 | register struct buffer *buf; | |
482 | if (NULL (buffer)) | |
483 | buf = current_buffer; | |
484 | else | |
485 | { | |
486 | CHECK_BUFFER (buffer, 0); | |
487 | buf = XBUFFER (buffer); | |
488 | } | |
489 | ||
490 | return make_number (BUF_MODIFF (buf)); | |
491 | } | |
492 | \f | |
493 | DEFUN ("rename-buffer", Frename_buffer, Srename_buffer, 1, 1, | |
494 | "sRename buffer (to new name): ", | |
495 | "Change current buffer's name to NEWNAME (a string).\n\ | |
496 | It is an error if a buffer named NEWNAME already exists.\n\ | |
497 | This does not change the name of the visited file (if any).") | |
498 | (name) | |
499 | register Lisp_Object name; | |
500 | { | |
501 | register Lisp_Object tem, buf; | |
502 | ||
503 | CHECK_STRING (name, 0); | |
504 | tem = Fget_buffer (name); | |
505 | if (!NULL (tem)) | |
506 | error ("Buffer name \"%s\" is in use", XSTRING (name)->data); | |
507 | ||
508 | current_buffer->name = name; | |
509 | XSET (buf, Lisp_Buffer, current_buffer); | |
510 | Fsetcar (Frassq (buf, Vbuffer_alist), name); | |
511 | if (NULL (current_buffer->filename) && !NULL (current_buffer->auto_save_file_name)) | |
512 | call0 (intern ("rename-auto-save-file")); | |
513 | return Qnil; | |
514 | } | |
515 | ||
516 | DEFUN ("other-buffer", Fother_buffer, Sother_buffer, 0, 1, 0, | |
517 | "Return most recently selected buffer other than BUFFER.\n\ | |
518 | Buffers not visible in windows are preferred to visible buffers.\n\ | |
519 | If no other buffer exists, the buffer `*scratch*' is returned.\n\ | |
520 | If BUFFER is omitted or nil, some interesting buffer is returned.") | |
521 | (buffer) | |
522 | register Lisp_Object buffer; | |
523 | { | |
524 | register Lisp_Object tail, buf, notsogood, tem; | |
525 | notsogood = Qnil; | |
526 | ||
527 | for (tail = Vbuffer_alist; !NULL (tail); tail = Fcdr (tail)) | |
528 | { | |
529 | buf = Fcdr (Fcar (tail)); | |
530 | if (EQ (buf, buffer)) | |
531 | continue; | |
532 | if (XSTRING (XBUFFER (buf)->name)->data[0] == ' ') | |
533 | continue; | |
534 | tem = Fget_buffer_window (buf, Qnil); | |
535 | if (NULL (tem)) | |
536 | return buf; | |
537 | if (NULL (notsogood)) | |
538 | notsogood = buf; | |
539 | } | |
540 | if (!NULL (notsogood)) | |
541 | return notsogood; | |
542 | return Fget_buffer_create (build_string ("*scratch*")); | |
543 | } | |
544 | \f | |
545 | DEFUN ("buffer-disable-undo", Fbuffer_disable_undo, Sbuffer_disable_undo, 1,1, | |
546 | 0, | |
547 | "Make BUFFER stop keeping undo information.") | |
548 | (buf) | |
549 | register Lisp_Object buf; | |
550 | { | |
551 | CHECK_BUFFER (buf, 0); | |
552 | XBUFFER (buf)->undo_list = Qt; | |
553 | return Qnil; | |
554 | } | |
555 | ||
556 | DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, Sbuffer_enable_undo, | |
557 | 0, 1, "", | |
558 | "Start keeping undo information for buffer BUFFER.\n\ | |
559 | No argument or nil as argument means do this for the current buffer.") | |
560 | (buf) | |
561 | register Lisp_Object buf; | |
562 | { | |
563 | register struct buffer *b; | |
564 | register Lisp_Object buf1; | |
565 | ||
566 | if (NULL (buf)) | |
567 | b = current_buffer; | |
568 | else | |
569 | { | |
570 | buf1 = Fget_buffer (buf); | |
571 | if (NULL (buf1)) nsberror (buf); | |
572 | b = XBUFFER (buf1); | |
573 | } | |
574 | ||
575 | if (EQ (b->undo_list, Qt)) | |
576 | b->undo_list = Qnil; | |
577 | ||
578 | return Qnil; | |
579 | } | |
580 | ||
581 | /* | |
582 | DEFVAR_LISP ("kill-buffer-hook", no_cell, "\ | |
583 | Hook to be run (by `run-hooks', which see) when a buffer is killed.\n\ | |
584 | The buffer being killed will be current while the hook is running.\n\ | |
585 | See `kill-buffer'." | |
586 | */ | |
587 | DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 1, 1, "bKill buffer: ", | |
588 | "Kill the buffer BUFFER.\n\ | |
589 | The argument may be a buffer or may be the name of a buffer.\n\ | |
590 | An argument of nil means kill the current buffer.\n\n\ | |
591 | Value is t if the buffer is actually killed, nil if user says no.\n\n\ | |
592 | The value of `kill-buffer-hook' (which may be local to that buffer),\n\ | |
593 | if not void, is a list of functions to be called, with no arguments,\n\ | |
594 | before the buffer is actually killed. The buffer to be killed is current\n\ | |
595 | when the hook functions are called.\n\n\ | |
596 | Any processes that have this buffer as the `process-buffer' are killed\n\ | |
597 | with `delete-process'.") | |
598 | (bufname) | |
599 | Lisp_Object bufname; | |
600 | { | |
601 | Lisp_Object buf; | |
602 | register struct buffer *b; | |
603 | register Lisp_Object tem; | |
604 | register struct Lisp_Marker *m; | |
605 | struct gcpro gcpro1, gcpro2; | |
606 | ||
607 | if (NULL (bufname)) | |
608 | buf = Fcurrent_buffer (); | |
609 | else | |
610 | buf = Fget_buffer (bufname); | |
611 | if (NULL (buf)) | |
612 | nsberror (bufname); | |
613 | ||
614 | b = XBUFFER (buf); | |
615 | ||
616 | /* Query if the buffer is still modified. */ | |
617 | if (INTERACTIVE && !NULL (b->filename) | |
618 | && BUF_MODIFF (b) > b->save_modified) | |
619 | { | |
620 | GCPRO2 (buf, bufname); | |
621 | tem = do_yes_or_no_p (format1 ("Buffer %s modified; kill anyway? ", | |
622 | XSTRING (b->name)->data)); | |
623 | UNGCPRO; | |
624 | if (NULL (tem)) | |
625 | return Qnil; | |
626 | } | |
627 | ||
628 | /* Run kill-buffer hook with the buffer to be killed the current buffer. */ | |
629 | { | |
630 | register Lisp_Object val; | |
631 | int count = specpdl_ptr - specpdl; | |
632 | ||
633 | record_unwind_protect (save_excursion_restore, save_excursion_save ()); | |
634 | set_buffer_internal (b); | |
635 | call1 (Vrun_hooks, Qkill_buffer_hook); | |
636 | unbind_to (count, Qnil); | |
637 | } | |
638 | ||
639 | /* We have no more questions to ask. Verify that it is valid | |
640 | to kill the buffer. This must be done after the questions | |
641 | since anything can happen within do_yes_or_no_p. */ | |
642 | ||
643 | /* Don't kill the minibuffer now current. */ | |
644 | if (EQ (buf, XWINDOW (minibuf_window)->buffer)) | |
645 | return Qnil; | |
646 | ||
647 | if (NULL (b->name)) | |
648 | return Qnil; | |
649 | ||
650 | /* Make this buffer not be current. | |
651 | In the process, notice if this is the sole visible buffer | |
652 | and give up if so. */ | |
653 | if (b == current_buffer) | |
654 | { | |
655 | tem = Fother_buffer (buf); | |
656 | Fset_buffer (tem); | |
657 | if (b == current_buffer) | |
658 | return Qnil; | |
659 | } | |
660 | ||
661 | /* Now there is no question: we can kill the buffer. */ | |
662 | ||
663 | #ifdef CLASH_DETECTION | |
664 | /* Unlock this buffer's file, if it is locked. */ | |
665 | unlock_buffer (b); | |
666 | #endif /* CLASH_DETECTION */ | |
667 | ||
668 | #ifdef subprocesses | |
669 | kill_buffer_processes (buf); | |
670 | #endif /* subprocesses */ | |
671 | ||
672 | tem = Vinhibit_quit; | |
673 | Vinhibit_quit = Qt; | |
674 | Vbuffer_alist = Fdelq (Frassq (buf, Vbuffer_alist), Vbuffer_alist); | |
675 | Freplace_buffer_in_windows (buf); | |
676 | Vinhibit_quit = tem; | |
677 | ||
678 | /* Delete any auto-save file. */ | |
679 | if (XTYPE (b->auto_save_file_name) == Lisp_String) | |
680 | { | |
681 | Lisp_Object tem; | |
682 | tem = Fsymbol_value (intern ("delete-auto-save-files")); | |
683 | if (! NULL (tem)) | |
684 | unlink (XSTRING (b->auto_save_file_name)->data); | |
685 | } | |
686 | ||
687 | /* Unchain all markers of this buffer | |
688 | and leave them pointing nowhere. */ | |
689 | for (tem = b->markers; !EQ (tem, Qnil); ) | |
690 | { | |
691 | m = XMARKER (tem); | |
692 | m->buffer = 0; | |
693 | tem = m->chain; | |
694 | m->chain = Qnil; | |
695 | } | |
696 | b->markers = Qnil; | |
697 | ||
698 | b->name = Qnil; | |
699 | BUFFER_FREE (BUF_BEG_ADDR (b)); | |
700 | b->undo_list = Qnil; | |
701 | ||
702 | return Qt; | |
703 | } | |
704 | \f | |
705 | /* Put the element for buffer BUF at the front of buffer-alist. | |
706 | This is done when a buffer is selected "visibly". | |
707 | It keeps buffer-alist in the order of recency of selection | |
708 | so that other_buffer will return something nice. */ | |
709 | ||
710 | record_buffer (buf) | |
711 | Lisp_Object buf; | |
712 | { | |
713 | register Lisp_Object link, prev; | |
714 | ||
715 | prev = Qnil; | |
716 | for (link = Vbuffer_alist; CONSP (link); link = XCONS (link)->cdr) | |
717 | { | |
718 | if (EQ (XCONS (XCONS (link)->car)->cdr, buf)) | |
719 | break; | |
720 | prev = link; | |
721 | } | |
722 | ||
723 | /* Effectively do Vbuffer_alist = Fdelq (link, Vbuffer_alist) | |
724 | but cannot use Fdelq here it that allows quitting. */ | |
725 | ||
726 | if (NULL (prev)) | |
727 | Vbuffer_alist = XCONS (Vbuffer_alist)->cdr; | |
728 | else | |
729 | XCONS (prev)->cdr = XCONS (XCONS (prev)->cdr)->cdr; | |
730 | ||
731 | XCONS(link)->cdr = Vbuffer_alist; | |
732 | Vbuffer_alist = link; | |
733 | } | |
734 | ||
735 | DEFUN ("switch-to-buffer", Fswitch_to_buffer, Sswitch_to_buffer, 1, 2, "BSwitch to buffer: ", | |
736 | "Select buffer BUFFER in the current window.\n\ | |
737 | BUFFER may be a buffer or a buffer name.\n\ | |
738 | Optional second arg NORECORD non-nil means\n\ | |
739 | do not put this buffer at the front of the list of recently selected ones.\n\ | |
740 | \n\ | |
741 | WARNING: This is NOT the way to work on another buffer temporarily\n\ | |
742 | within a Lisp program! Use `set-buffer' instead. That avoids messing with\n\ | |
743 | the window-buffer correspondences.") | |
744 | (bufname, norecord) | |
745 | Lisp_Object bufname, norecord; | |
746 | { | |
747 | register Lisp_Object buf; | |
748 | Lisp_Object tem; | |
749 | ||
750 | if (EQ (minibuf_window, selected_window)) | |
751 | error ("Cannot switch buffers in minibuffer window"); | |
752 | tem = Fwindow_dedicated_p (selected_window); | |
753 | if (!NULL (tem)) | |
754 | error ("Cannot switch buffers in a dedicated window"); | |
755 | ||
756 | if (NULL (bufname)) | |
757 | buf = Fother_buffer (Fcurrent_buffer ()); | |
758 | else | |
759 | buf = Fget_buffer_create (bufname); | |
760 | Fset_buffer (buf); | |
761 | if (NULL (norecord)) | |
762 | record_buffer (buf); | |
763 | ||
764 | Fset_window_buffer (EQ (selected_window, minibuf_window) | |
765 | ? Fnext_window (minibuf_window, Qnil) : selected_window, | |
766 | buf); | |
767 | ||
768 | return Qnil; | |
769 | } | |
770 | ||
771 | DEFUN ("pop-to-buffer", Fpop_to_buffer, Spop_to_buffer, 1, 2, 0, | |
772 | "Select buffer BUFFER in some window, preferably a different one.\n\ | |
773 | If BUFFER is nil, then some other buffer is chosen.\n\ | |
774 | If `pop-up-windows' is non-nil, windows can be split to do this.\n\ | |
775 | If optional second arg OTHER-WINDOW is non-nil, insist on finding another\n\ | |
776 | window even if BUFFER is already visible in the selected window.") | |
777 | (bufname, other) | |
778 | Lisp_Object bufname, other; | |
779 | { | |
780 | register Lisp_Object buf; | |
781 | if (NULL (bufname)) | |
782 | buf = Fother_buffer (Fcurrent_buffer ()); | |
783 | else | |
784 | buf = Fget_buffer_create (bufname); | |
785 | Fset_buffer (buf); | |
786 | record_buffer (buf); | |
787 | Fselect_window (Fdisplay_buffer (buf, other)); | |
788 | return Qnil; | |
789 | } | |
790 | ||
791 | DEFUN ("current-buffer", Fcurrent_buffer, Scurrent_buffer, 0, 0, 0, | |
792 | "Return the current buffer as a Lisp object.") | |
793 | () | |
794 | { | |
795 | register Lisp_Object buf; | |
796 | XSET (buf, Lisp_Buffer, current_buffer); | |
797 | return buf; | |
798 | } | |
799 | \f | |
800 | /* Set the current buffer to b */ | |
801 | ||
802 | void | |
803 | set_buffer_internal (b) | |
804 | register struct buffer *b; | |
805 | { | |
806 | register struct buffer *old_buf; | |
807 | register Lisp_Object tail, valcontents; | |
808 | enum Lisp_Type tem; | |
809 | ||
810 | if (current_buffer == b) | |
811 | return; | |
812 | ||
813 | windows_or_buffers_changed = 1; | |
814 | old_buf = current_buffer; | |
815 | current_buffer = b; | |
816 | last_known_column_point = -1; /* invalidate indentation cache */ | |
817 | ||
818 | /* Look down buffer's list of local Lisp variables | |
819 | to find and update any that forward into C variables. */ | |
820 | ||
821 | for (tail = b->local_var_alist; !NULL (tail); tail = XCONS (tail)->cdr) | |
822 | { | |
823 | valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value; | |
824 | if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value | |
825 | || XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value) | |
826 | && (tem = XTYPE (XCONS (valcontents)->car), | |
827 | (tem == Lisp_Boolfwd || tem == Lisp_Intfwd | |
828 | || tem == Lisp_Objfwd))) | |
829 | /* Just reference the variable | |
830 | to cause it to become set for this buffer. */ | |
831 | Fsymbol_value (XCONS (XCONS (tail)->car)->car); | |
832 | } | |
833 | ||
834 | /* Do the same with any others that were local to the previous buffer */ | |
835 | ||
836 | if (old_buf) | |
837 | for (tail = old_buf->local_var_alist; !NULL (tail); tail = XCONS (tail)->cdr) | |
838 | { | |
839 | valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value; | |
840 | if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value | |
841 | || XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value) | |
842 | && (tem = XTYPE (XCONS (valcontents)->car), | |
843 | (tem == Lisp_Boolfwd || tem == Lisp_Intfwd | |
844 | || tem == Lisp_Objfwd))) | |
845 | /* Just reference the variable | |
846 | to cause it to become set for this buffer. */ | |
847 | Fsymbol_value (XCONS (XCONS (tail)->car)->car); | |
848 | } | |
849 | } | |
850 | ||
851 | DEFUN ("set-buffer", Fset_buffer, Sset_buffer, 1, 1, 0, | |
852 | "Make the buffer BUFFER current for editing operations.\n\ | |
853 | BUFFER may be a buffer or the name of an existing buffer.\n\ | |
854 | See also `save-excursion' when you want to make a buffer current temporarily.\n\ | |
855 | This function does not display the buffer, so its effect ends\n\ | |
856 | when the current command terminates.\n\ | |
857 | Use `switch-to-buffer' or `pop-to-buffer' to switch buffers permanently.") | |
858 | (bufname) | |
859 | register Lisp_Object bufname; | |
860 | { | |
861 | register Lisp_Object buffer; | |
862 | buffer = Fget_buffer (bufname); | |
863 | if (NULL (buffer)) | |
864 | nsberror (bufname); | |
865 | if (NULL (XBUFFER (buffer)->name)) | |
866 | error ("Selecting deleted buffer"); | |
867 | set_buffer_internal (XBUFFER (buffer)); | |
868 | return buffer; | |
869 | } | |
870 | \f | |
871 | DEFUN ("barf-if-buffer-read-only", Fbarf_if_buffer_read_only, | |
872 | Sbarf_if_buffer_read_only, 0, 0, 0, | |
873 | "Signal a `buffer-read-only' error if the current buffer is read-only.") | |
874 | () | |
875 | { | |
876 | while (!NULL (current_buffer->read_only)) | |
877 | Fsignal (Qbuffer_read_only, (Fcons (Fcurrent_buffer (), Qnil))); | |
878 | return Qnil; | |
879 | } | |
880 | ||
881 | DEFUN ("bury-buffer", Fbury_buffer, Sbury_buffer, 0, 1, "", | |
882 | "Put BUFFER at the end of the list of all buffers.\n\ | |
883 | There it is the least likely candidate for `other-buffer' to return;\n\ | |
884 | thus, the least likely buffer for \\[switch-to-buffer] to select by default.") | |
885 | (buf) | |
886 | register Lisp_Object buf; | |
887 | { | |
888 | register Lisp_Object aelt, link; | |
889 | ||
890 | if (NULL (buf)) | |
891 | { | |
892 | XSET (buf, Lisp_Buffer, current_buffer); | |
893 | Fswitch_to_buffer (Fother_buffer (buf), Qnil); | |
894 | } | |
895 | else | |
896 | { | |
897 | Lisp_Object buf1; | |
898 | ||
899 | buf1 = Fget_buffer (buf); | |
900 | if (NULL (buf1)) | |
901 | nsberror (buf); | |
902 | buf = buf1; | |
903 | } | |
904 | ||
905 | aelt = Frassq (buf, Vbuffer_alist); | |
906 | link = Fmemq (aelt, Vbuffer_alist); | |
907 | Vbuffer_alist = Fdelq (aelt, Vbuffer_alist); | |
908 | XCONS (link)->cdr = Qnil; | |
909 | Vbuffer_alist = nconc2 (Vbuffer_alist, link); | |
910 | return Qnil; | |
911 | } | |
912 | \f | |
913 | DEFUN ("erase-buffer", Ferase_buffer, Serase_buffer, 0, 0, 0, | |
914 | "Delete the entire contents of the current buffer.\n\ | |
915 | Any clipping restriction in effect (see `narrow-to-buffer') is removed,\n\ | |
916 | so the buffer is truly empty after this.") | |
917 | () | |
918 | { | |
919 | Fwiden (); | |
920 | del_range (BEG, Z); | |
921 | current_buffer->last_window_start = 1; | |
922 | /* Prevent warnings, or suspension of auto saving, that would happen | |
923 | if future size is less than past size. Use of erase-buffer | |
924 | implies that the future text is not really related to the past text. */ | |
925 | XFASTINT (current_buffer->save_length) = 0; | |
926 | return Qnil; | |
927 | } | |
928 | ||
929 | validate_region (b, e) | |
930 | register Lisp_Object *b, *e; | |
931 | { | |
932 | register int i; | |
933 | ||
934 | CHECK_NUMBER_COERCE_MARKER (*b, 0); | |
935 | CHECK_NUMBER_COERCE_MARKER (*e, 1); | |
936 | ||
937 | if (XINT (*b) > XINT (*e)) | |
938 | { | |
939 | i = XFASTINT (*b); /* This is legit even if *b is < 0 */ | |
940 | *b = *e; | |
941 | XFASTINT (*e) = i; /* because this is all we do with i. */ | |
942 | } | |
943 | ||
944 | if (!(BEGV <= XINT (*b) && XINT (*b) <= XINT (*e) | |
945 | && XINT (*e) <= ZV)) | |
946 | args_out_of_range (*b, *e); | |
947 | } | |
948 | \f | |
949 | Lisp_Object | |
950 | list_buffers_1 (files) | |
951 | Lisp_Object files; | |
952 | { | |
953 | register Lisp_Object tail, tem, buf; | |
954 | Lisp_Object col1, col2, col3, minspace; | |
955 | register struct buffer *old = current_buffer, *b; | |
956 | int desired_point = 0; | |
957 | Lisp_Object other_file_symbol; | |
958 | ||
959 | other_file_symbol = intern ("list-buffers-directory"); | |
960 | ||
961 | XFASTINT (col1) = 19; | |
962 | XFASTINT (col2) = 25; | |
963 | XFASTINT (col3) = 40; | |
964 | XFASTINT (minspace) = 1; | |
965 | ||
966 | Fset_buffer (Vstandard_output); | |
967 | ||
968 | tail = intern ("Buffer-menu-mode"); | |
969 | if (!EQ (tail, current_buffer->major_mode) | |
970 | && (tem = Ffboundp (tail), !NULL (tem))) | |
971 | call0 (tail); | |
972 | Fbuffer_disable_undo (Vstandard_output); | |
973 | current_buffer->read_only = Qnil; | |
974 | ||
975 | write_string ("\ | |
976 | MR Buffer Size Mode File\n\ | |
977 | -- ------ ---- ---- ----\n", -1); | |
978 | ||
979 | for (tail = Vbuffer_alist; !NULL (tail); tail = Fcdr (tail)) | |
980 | { | |
981 | buf = Fcdr (Fcar (tail)); | |
982 | b = XBUFFER (buf); | |
983 | /* Don't mention the minibuffers. */ | |
984 | if (XSTRING (b->name)->data[0] == ' ') | |
985 | continue; | |
986 | /* Optionally don't mention buffers that lack files. */ | |
987 | if (!NULL (files) && NULL (b->filename)) | |
988 | continue; | |
989 | /* Identify the current buffer. */ | |
990 | if (b == old) | |
991 | desired_point = point; | |
992 | write_string (b == old ? "." : " ", -1); | |
993 | /* Identify modified buffers */ | |
994 | write_string (BUF_MODIFF (b) > b->save_modified ? "*" : " ", -1); | |
995 | write_string (NULL (b->read_only) ? " " : "% ", -1); | |
996 | Fprinc (b->name, Qnil); | |
997 | Findent_to (col1, make_number (2)); | |
998 | XFASTINT (tem) = BUF_Z (b) - BUF_BEG (b); | |
999 | Fprin1 (tem, Qnil); | |
1000 | Findent_to (col2, minspace); | |
1001 | Fprinc (b->mode_name, Qnil); | |
1002 | Findent_to (col3, minspace); | |
1003 | ||
1004 | if (!NULL (b->filename)) | |
1005 | Fprinc (b->filename, Qnil); | |
1006 | else | |
1007 | { | |
1008 | /* No visited file; check local value of list-buffers-directory. */ | |
1009 | Lisp_Object tem; | |
1010 | set_buffer_internal (b); | |
1011 | tem = Fboundp (other_file_symbol); | |
1012 | if (!NULL (tem)) | |
1013 | { | |
1014 | tem = Fsymbol_value (other_file_symbol); | |
1015 | Fset_buffer (Vstandard_output); | |
1016 | if (XTYPE (tem) == Lisp_String) | |
1017 | Fprinc (tem, Qnil); | |
1018 | } | |
1019 | else | |
1020 | Fset_buffer (Vstandard_output); | |
1021 | } | |
1022 | write_string ("\n", -1); | |
1023 | } | |
1024 | ||
1025 | current_buffer->read_only = Qt; | |
1026 | set_buffer_internal (old); | |
1027 | /* Foo. This doesn't work since temp_output_buffer_show sets point to 1 | |
1028 | if (desired_point) | |
1029 | XBUFFER (Vstandard_output)->text.pointloc = desired_point; | |
1030 | */ | |
1031 | return Qnil; | |
1032 | } | |
1033 | ||
1034 | DEFUN ("list-buffers", Flist_buffers, Slist_buffers, 0, 1, "P", | |
1035 | "Display a list of names of existing buffers.\n\ | |
1036 | The list is displayed in a buffer named `*Buffer List*'.\n\ | |
1037 | Note that buffers with names starting with spaces are omitted.\n\ | |
1038 | Non-null optional arg FILES-ONLY means mention only file buffers.\n\ | |
1039 | \n\ | |
1040 | The M column contains a * for buffers that are modified.\n\ | |
1041 | The R column contains a % for buffers that are read-only.") | |
1042 | (files) | |
1043 | Lisp_Object files; | |
1044 | { | |
1045 | internal_with_output_to_temp_buffer ("*Buffer List*", | |
1046 | list_buffers_1, files); | |
1047 | return Qnil; | |
1048 | } | |
1049 | ||
1050 | DEFUN ("kill-all-local-variables", Fkill_all_local_variables, Skill_all_local_variables, | |
1051 | 0, 0, 0, | |
1052 | "Switch to Fundamental mode by killing current buffer's local variables.\n\ | |
1053 | Most local variable bindings are eliminated so that the default values\n\ | |
1054 | become effective once more. Also, the syntax table is set from\n\ | |
1055 | `standard-syntax-table', the local keymap is set to nil,\n\ | |
1056 | and the abbrev table from `fundamental-mode-abbrev-table'.\n\ | |
1057 | This function also forces redisplay of the mode line.\n\ | |
1058 | \n\ | |
1059 | Every function to select a new major mode starts by\n\ | |
1060 | calling this function.\n\n\ | |
1061 | As a special exception, local variables whose names have\n\ | |
1062 | a non-nil `permanent-local' property are not eliminated by this function.") | |
1063 | () | |
1064 | { | |
1065 | register Lisp_Object alist, sym, tem; | |
1066 | Lisp_Object oalist; | |
1067 | oalist = current_buffer->local_var_alist; | |
1068 | ||
1069 | /* Make sure no local variables remain set up with this buffer | |
1070 | for their current values. */ | |
1071 | ||
1072 | for (alist = oalist; !NULL (alist); alist = XCONS (alist)->cdr) | |
1073 | { | |
1074 | sym = XCONS (XCONS (alist)->car)->car; | |
1075 | ||
1076 | /* Need not do anything if some other buffer's binding is now encached. */ | |
1077 | tem = XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->car; | |
1078 | if (XBUFFER (tem) == current_buffer) | |
1079 | { | |
1080 | /* Symbol is set up for this buffer's old local value. | |
1081 | Set it up for the current buffer with the default value. */ | |
1082 | ||
1083 | tem = XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->cdr; | |
1084 | XCONS (tem)->car = tem; | |
1085 | XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->car = Fcurrent_buffer (); | |
1086 | store_symval_forwarding (sym, XCONS (XSYMBOL (sym)->value)->car, | |
1087 | XCONS (tem)->cdr); | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /* Actually eliminate all local bindings of this buffer. */ | |
1092 | ||
1093 | reset_buffer_local_variables (current_buffer); | |
1094 | ||
1095 | /* Redisplay mode lines; we are changing major mode. */ | |
1096 | ||
1097 | update_mode_lines++; | |
1098 | ||
1099 | /* Any which are supposed to be permanent, | |
1100 | make local again, with the same values they had. */ | |
1101 | ||
1102 | for (alist = oalist; !NULL (alist); alist = XCONS (alist)->cdr) | |
1103 | { | |
1104 | sym = XCONS (XCONS (alist)->car)->car; | |
1105 | tem = Fget (sym, Qpermanent_local); | |
1106 | if (! NULL (tem)) | |
1107 | Fmake_local_variable (sym, XCONS (XCONS (alist)->car)->cdr); | |
1108 | } | |
1109 | ||
1110 | /* Force mode-line redisplay. Useful here because all major mode | |
1111 | commands call this function. */ | |
1112 | update_mode_lines++; | |
1113 | ||
1114 | return Qnil; | |
1115 | } | |
1116 | \f | |
1117 | DEFUN ("region-fields", Fregion_fields, Sregion_fields, 2, 4, "", | |
1118 | "Return list of fields overlapping a given portion of a buffer.\n\ | |
1119 | The portion is specified by arguments START, END and BUFFER.\n\ | |
1120 | BUFFER defaults to the current buffer.\n\ | |
1121 | Optional 4th arg ERROR-CHECK non nil means just report an error\n\ | |
1122 | if any protected fields overlap this portion.") | |
1123 | (start, end, buffer, error_check) | |
1124 | Lisp_Object start, end, buffer, error_check; | |
1125 | { | |
1126 | register int start_loc, end_loc; | |
1127 | Lisp_Object fieldlist; | |
1128 | Lisp_Object collector; | |
1129 | ||
1130 | if (NULL (buffer)) | |
1131 | fieldlist = current_buffer->fieldlist; | |
1132 | else | |
1133 | { | |
1134 | CHECK_BUFFER (buffer, 1); | |
1135 | fieldlist = XBUFFER (buffer)->fieldlist; | |
1136 | } | |
1137 | ||
1138 | CHECK_NUMBER_COERCE_MARKER (start, 2); | |
1139 | start_loc = XINT (start); | |
1140 | ||
1141 | CHECK_NUMBER_COERCE_MARKER (end, 2); | |
1142 | end_loc = XINT (end); | |
1143 | ||
1144 | collector = Qnil; | |
1145 | ||
1146 | while (XTYPE (fieldlist) == Lisp_Cons) | |
1147 | { | |
1148 | register Lisp_Object field; | |
1149 | register int field_start, field_end; | |
1150 | ||
1151 | field = XCONS (fieldlist)->car; | |
1152 | field_start = marker_position (FIELD_START_MARKER (field)) - 1; | |
1153 | field_end = marker_position (FIELD_END_MARKER (field)); | |
1154 | ||
1155 | if ((start_loc < field_start && end_loc > field_start) | |
1156 | || (start_loc >= field_start && start_loc < field_end)) | |
1157 | { | |
1158 | if (!NULL (error_check)) | |
1159 | { | |
1160 | if (!NULL (FIELD_PROTECTED_FLAG (field))) | |
1161 | { | |
1162 | struct gcpro gcpro1; | |
1163 | GCPRO1 (fieldlist); | |
1164 | Fsignal (Qprotected_field, Fcons (field, Qnil)); | |
1165 | UNGCPRO; | |
1166 | } | |
1167 | } | |
1168 | else | |
1169 | collector = Fcons (field, collector); | |
1170 | } | |
1171 | ||
1172 | fieldlist = XCONS (fieldlist)->cdr; | |
1173 | } | |
1174 | ||
1175 | return collector; | |
1176 | } | |
1177 | \f | |
1178 | init_buffer_once () | |
1179 | { | |
1180 | register Lisp_Object tem; | |
1181 | ||
1182 | /* Make sure all markable slots in buffer_defaults | |
1183 | are initialized reasonably, so mark_buffer won't choke. */ | |
1184 | reset_buffer (&buffer_defaults); | |
1185 | reset_buffer (&buffer_local_symbols); | |
1186 | XSET (Vbuffer_defaults, Lisp_Buffer, &buffer_defaults); | |
1187 | XSET (Vbuffer_local_symbols, Lisp_Buffer, &buffer_local_symbols); | |
1188 | ||
1189 | /* Set up the default values of various buffer slots. */ | |
1190 | /* Must do these before making the first buffer! */ | |
1191 | ||
1192 | /* real setup is done in loaddefs.el */ | |
1193 | buffer_defaults.mode_line_format = build_string ("%-"); | |
1194 | buffer_defaults.abbrev_mode = Qnil; | |
1195 | buffer_defaults.overwrite_mode = Qnil; | |
1196 | buffer_defaults.case_fold_search = Qt; | |
1197 | buffer_defaults.auto_fill_function = Qnil; | |
1198 | buffer_defaults.selective_display = Qnil; | |
1199 | #ifndef old | |
1200 | buffer_defaults.selective_display_ellipses = Qt; | |
1201 | #endif | |
1202 | buffer_defaults.abbrev_table = Qnil; | |
1203 | buffer_defaults.display_table = Qnil; | |
1204 | buffer_defaults.fieldlist = Qnil; | |
1205 | buffer_defaults.undo_list = Qnil; | |
1206 | ||
1207 | XFASTINT (buffer_defaults.tab_width) = 8; | |
1208 | buffer_defaults.truncate_lines = Qnil; | |
1209 | buffer_defaults.ctl_arrow = Qt; | |
1210 | ||
1211 | XFASTINT (buffer_defaults.fill_column) = 70; | |
1212 | XFASTINT (buffer_defaults.left_margin) = 0; | |
1213 | ||
1214 | /* Assign the local-flags to the slots that have default values. | |
1215 | The local flag is a bit that is used in the buffer | |
1216 | to say that it has its own local value for the slot. | |
1217 | The local flag bits are in the local_var_flags slot of the buffer. */ | |
1218 | ||
1219 | /* Nothing can work if this isn't true */ | |
1220 | if (sizeof (int) != sizeof (Lisp_Object)) abort (); | |
1221 | ||
1222 | /* 0 means not a lisp var, -1 means always local, else mask */ | |
1223 | bzero (&buffer_local_flags, sizeof buffer_local_flags); | |
1224 | XFASTINT (buffer_local_flags.filename) = -1; | |
1225 | XFASTINT (buffer_local_flags.directory) = -1; | |
1226 | XFASTINT (buffer_local_flags.backed_up) = -1; | |
1227 | XFASTINT (buffer_local_flags.save_length) = -1; | |
1228 | XFASTINT (buffer_local_flags.auto_save_file_name) = -1; | |
1229 | XFASTINT (buffer_local_flags.read_only) = -1; | |
1230 | XFASTINT (buffer_local_flags.major_mode) = -1; | |
1231 | XFASTINT (buffer_local_flags.mode_name) = -1; | |
1232 | XFASTINT (buffer_local_flags.undo_list) = -1; | |
1233 | ||
1234 | XFASTINT (buffer_local_flags.mode_line_format) = 1; | |
1235 | XFASTINT (buffer_local_flags.abbrev_mode) = 2; | |
1236 | XFASTINT (buffer_local_flags.overwrite_mode) = 4; | |
1237 | XFASTINT (buffer_local_flags.case_fold_search) = 8; | |
1238 | XFASTINT (buffer_local_flags.auto_fill_function) = 0x10; | |
1239 | XFASTINT (buffer_local_flags.selective_display) = 0x20; | |
1240 | #ifndef old | |
1241 | XFASTINT (buffer_local_flags.selective_display_ellipses) = 0x40; | |
1242 | #endif | |
1243 | XFASTINT (buffer_local_flags.tab_width) = 0x80; | |
1244 | XFASTINT (buffer_local_flags.truncate_lines) = 0x100; | |
1245 | XFASTINT (buffer_local_flags.ctl_arrow) = 0x200; | |
1246 | XFASTINT (buffer_local_flags.fill_column) = 0x400; | |
1247 | XFASTINT (buffer_local_flags.left_margin) = 0x800; | |
1248 | XFASTINT (buffer_local_flags.abbrev_table) = 0x1000; | |
1249 | XFASTINT (buffer_local_flags.display_table) = 0x2000; | |
1250 | XFASTINT (buffer_local_flags.fieldlist) = 0x4000; | |
1251 | XFASTINT (buffer_local_flags.syntax_table) = 0x8000; | |
1252 | ||
1253 | Vbuffer_alist = Qnil; | |
1254 | current_buffer = 0; | |
1255 | all_buffers = 0; | |
1256 | ||
1257 | QSFundamental = build_string ("Fundamental"); | |
1258 | ||
1259 | Qfundamental_mode = intern ("fundamental-mode"); | |
1260 | buffer_defaults.major_mode = Qfundamental_mode; | |
1261 | ||
1262 | Qmode_class = intern ("mode-class"); | |
1263 | ||
1264 | Qprotected_field = intern ("protected-field"); | |
1265 | ||
1266 | Qpermanent_local = intern ("permanent-local"); | |
1267 | ||
1268 | Qkill_buffer_hook = intern ("kill-buffer-hook"); | |
1269 | ||
1270 | Vprin1_to_string_buffer = Fget_buffer_create (build_string (" prin1")); | |
1271 | /* super-magic invisible buffer */ | |
1272 | Vbuffer_alist = Qnil; | |
1273 | ||
1274 | tem = Fset_buffer (Fget_buffer_create (build_string ("*scratch*"))); | |
1275 | /* Want no undo records for *scratch* | |
1276 | until after Emacs is dumped */ | |
1277 | Fbuffer_disable_undo (tem); | |
1278 | } | |
1279 | ||
1280 | init_buffer () | |
1281 | { | |
1282 | char buf[MAXPATHLEN+1]; | |
1283 | ||
1284 | Fset_buffer (Fget_buffer_create (build_string ("*scratch*"))); | |
1285 | if (getwd (buf) == 0) | |
1286 | fatal ("`getwd' failed: %s.\n", buf); | |
1287 | ||
1288 | #ifndef VMS | |
1289 | /* Maybe this should really use some standard subroutine | |
1290 | whose definition is filename syntax dependent. */ | |
1291 | if (buf[strlen (buf) - 1] != '/') | |
1292 | strcat (buf, "/"); | |
1293 | #endif /* not VMS */ | |
1294 | current_buffer->directory = build_string (buf); | |
1295 | } | |
1296 | ||
1297 | /* initialize the buffer routines */ | |
1298 | syms_of_buffer () | |
1299 | { | |
1300 | staticpro (&Vbuffer_defaults); | |
1301 | staticpro (&Vbuffer_local_symbols); | |
1302 | staticpro (&Qfundamental_mode); | |
1303 | staticpro (&Qmode_class); | |
1304 | staticpro (&QSFundamental); | |
1305 | staticpro (&Vbuffer_alist); | |
1306 | staticpro (&Qprotected_field); | |
1307 | staticpro (&Qpermanent_local); | |
1308 | staticpro (&Qkill_buffer_hook); | |
1309 | ||
1310 | Fput (Qprotected_field, Qerror_conditions, | |
1311 | Fcons (Qprotected_field, Fcons (Qerror, Qnil))); | |
1312 | Fput (Qprotected_field, Qerror_message, | |
1313 | build_string ("Attempt to modify a protected field")); | |
1314 | ||
1315 | /* All these use DEFVAR_LISP_NOPRO because the slots in | |
1316 | buffer_defaults will all be marked via Vbuffer_defaults. */ | |
1317 | ||
1318 | DEFVAR_LISP_NOPRO ("default-mode-line-format", | |
1319 | &buffer_defaults.mode_line_format, | |
1320 | "Default value of `mode-line-format' for buffers that don't override it.\n\ | |
1321 | This is the same as (default-value 'mode-line-format)."); | |
1322 | ||
1323 | DEFVAR_LISP_NOPRO ("default-abbrev-mode", | |
1324 | &buffer_defaults.abbrev_mode, | |
1325 | "Default value of `abbrev-mode' for buffers that do not override it.\n\ | |
1326 | This is the same as (default-value 'abbrev-mode)."); | |
1327 | ||
1328 | DEFVAR_LISP_NOPRO ("default-ctl-arrow", | |
1329 | &buffer_defaults.ctl_arrow, | |
1330 | "Default value of `ctl-arrow' for buffers that do not override it.\n\ | |
1331 | This is the same as (default-value 'ctl-arrow)."); | |
1332 | ||
1333 | DEFVAR_LISP_NOPRO ("default-truncate-lines", | |
1334 | &buffer_defaults.truncate_lines, | |
1335 | "Default value of `truncate-lines' for buffers that do not override it.\n\ | |
1336 | This is the same as (default-value 'truncate-lines)."); | |
1337 | ||
1338 | DEFVAR_LISP_NOPRO ("default-fill-column", | |
1339 | &buffer_defaults.fill_column, | |
1340 | "Default value of `fill-column' for buffers that do not override it.\n\ | |
1341 | This is the same as (default-value 'fill-column)."); | |
1342 | ||
1343 | DEFVAR_LISP_NOPRO ("default-left-margin", | |
1344 | &buffer_defaults.left_margin, | |
1345 | "Default value of `left-margin' for buffers that do not override it.\n\ | |
1346 | This is the same as (default-value 'left-margin)."); | |
1347 | ||
1348 | DEFVAR_LISP_NOPRO ("default-tab-width", | |
1349 | &buffer_defaults.tab_width, | |
1350 | "Default value of `tab-width' for buffers that do not override it.\n\ | |
1351 | This is the same as (default-value 'tab-width)."); | |
1352 | ||
1353 | DEFVAR_LISP_NOPRO ("default-case-fold-search", | |
1354 | &buffer_defaults.case_fold_search, | |
1355 | "Default value of `case-fold-search' for buffers that don't override it.\n\ | |
1356 | This is the same as (default-value 'case-fold-search)."); | |
1357 | ||
1358 | DEFVAR_PER_BUFFER ("mode-line-format", ¤t_buffer->mode_line_format, 0); | |
1359 | ||
1360 | /* This doc string is too long for cpp; cpp dies if it isn't in a comment. | |
1361 | But make-docfile finds it! | |
1362 | DEFVAR_PER_BUFFER ("mode-line-format", ¤t_buffer->mode_line_format, | |
1363 | "Template for displaying mode line for current buffer.\n\ | |
1364 | Each buffer has its own value of this variable.\n\ | |
1365 | Value may be a string, a symbol or a list or cons cell.\n\ | |
1366 | For a symbol, its value is used (but it is ignored if t or nil).\n\ | |
1367 | A string appearing directly as the value of a symbol is processed verbatim\n\ | |
1368 | in that the %-constructs below are not recognized.\n\ | |
1369 | For a list whose car is a symbol, the symbol's value is taken,\n\ | |
1370 | and if that is non-nil, the cadr of the list is processed recursively.\n\ | |
1371 | Otherwise, the caddr of the list (if there is one) is processed.\n\ | |
1372 | For a list whose car is a string or list, each element is processed\n\ | |
1373 | recursively and the results are effectively concatenated.\n\ | |
1374 | For a list whose car is an integer, the cdr of the list is processed\n\ | |
1375 | and padded (if the number is positive) or truncated (if negative)\n\ | |
1376 | to the width specified by that number.\n\ | |
1377 | A string is printed verbatim in the mode line except for %-constructs:\n\ | |
1378 | (%-constructs are allowed when the string is the entire mode-line-format\n\ | |
1379 | or when it is found in a cons-cell or a list)\n\ | |
1380 | %b -- print buffer name. %f -- print visited file name.\n\ | |
1381 | %* -- print *, % or hyphen. %m -- print value of mode-name (obsolete).\n\ | |
1382 | %s -- print process status. %M -- print value of global-mode-string. (obs)\n\ | |
1383 | %p -- print percent of buffer above top of window, or top, bot or all.\n\ | |
1384 | %n -- print Narrow if appropriate.\n\ | |
1385 | %[ -- print one [ for each recursive editing level. %] similar.\n\ | |
1386 | %% -- print %. %- -- print infinitely many dashes.\n\ | |
1387 | Decimal digits after the % specify field width to which to pad."); | |
1388 | */ | |
1389 | ||
1390 | DEFVAR_LISP_NOPRO ("default-major-mode", &buffer_defaults.major_mode, | |
1391 | "*Major mode for new buffers. Defaults to `fundamental-mode'.\n\ | |
1392 | nil here means use current buffer's major mode."); | |
1393 | ||
1394 | DEFVAR_PER_BUFFER ("major-mode", ¤t_buffer->major_mode, | |
1395 | "Symbol for current buffer's major mode."); | |
1396 | ||
1397 | DEFVAR_PER_BUFFER ("mode-name", ¤t_buffer->mode_name, | |
1398 | "Pretty name of current buffer's major mode (a string)."); | |
1399 | ||
1400 | DEFVAR_PER_BUFFER ("abbrev-mode", ¤t_buffer->abbrev_mode, | |
1401 | "Non-nil turns on automatic expansion of abbrevs as they are inserted.\n\ | |
1402 | Automatically becomes buffer-local when set in any fashion."); | |
1403 | ||
1404 | DEFVAR_PER_BUFFER ("case-fold-search", ¤t_buffer->case_fold_search, | |
1405 | "*Non-nil if searches should ignore case.\n\ | |
1406 | Automatically becomes buffer-local when set in any fashion."); | |
1407 | ||
1408 | DEFVAR_PER_BUFFER ("fill-column", ¤t_buffer->fill_column, | |
1409 | "*Column beyond which automatic line-wrapping should happen.\n\ | |
1410 | Automatically becomes buffer-local when set in any fashion."); | |
1411 | ||
1412 | DEFVAR_PER_BUFFER ("left-margin", ¤t_buffer->left_margin, | |
1413 | "*Column for the default indent-line-function to indent to.\n\ | |
1414 | Linefeed indents to this column in Fundamental mode.\n\ | |
1415 | Automatically becomes buffer-local when set in any fashion."); | |
1416 | ||
1417 | DEFVAR_PER_BUFFER ("tab-width", ¤t_buffer->tab_width, | |
1418 | "*Distance between tab stops (for display of tab characters), in columns.\n\ | |
1419 | Automatically becomes buffer-local when set in any fashion."); | |
1420 | ||
1421 | DEFVAR_PER_BUFFER ("ctl-arrow", ¤t_buffer->ctl_arrow, | |
1422 | "*Non-nil means display control chars with uparrow.\n\ | |
1423 | Nil means use backslash and octal digits.\n\ | |
1424 | Automatically becomes buffer-local when set in any fashion.\n\ | |
1425 | This variable does not apply to characters whose display is specified\n\ | |
1426 | in the current display table (if there is one)."); | |
1427 | ||
1428 | DEFVAR_PER_BUFFER ("truncate-lines", ¤t_buffer->truncate_lines, | |
1429 | "*Non-nil means do not display continuation lines;\n\ | |
1430 | give each line of text one screen line.\n\ | |
1431 | Automatically becomes buffer-local when set in any fashion.\n\ | |
1432 | \n\ | |
1433 | Note that this is overridden by the variable\n\ | |
1434 | `truncate-partial-width-windows' if that variable is non-nil\n\ | |
1435 | and this buffer is not full-screen width."); | |
1436 | ||
1437 | DEFVAR_PER_BUFFER ("default-directory", ¤t_buffer->directory, | |
1438 | "Name of default directory of current buffer. Should end with slash.\n\ | |
1439 | Each buffer has its own value of this variable."); | |
1440 | ||
1441 | DEFVAR_PER_BUFFER ("auto-fill-function", ¤t_buffer->auto_fill_function, | |
1442 | "Function called (if non-nil) to perform auto-fill.\n\ | |
1443 | It is called after self-inserting a space at a column beyond `fill-column'.\n\ | |
1444 | Each buffer has its own value of this variable.\n\ | |
1445 | NOTE: This variable is not an ordinary hook;\n\ | |
1446 | It may not be a list of functions."); | |
1447 | ||
1448 | DEFVAR_PER_BUFFER ("buffer-file-name", ¤t_buffer->filename, | |
1449 | "Name of file visited in current buffer, or nil if not visiting a file.\n\ | |
1450 | Each buffer has its own value of this variable."); | |
1451 | ||
1452 | DEFVAR_PER_BUFFER ("buffer-auto-save-file-name", | |
1453 | ¤t_buffer->auto_save_file_name, | |
1454 | "Name of file for auto-saving current buffer,\n\ | |
1455 | or nil if buffer should not be auto-saved.\n\ | |
1456 | Each buffer has its own value of this variable."); | |
1457 | ||
1458 | DEFVAR_PER_BUFFER ("buffer-read-only", ¤t_buffer->read_only, | |
1459 | "Non-nil if this buffer is read-only.\n\ | |
1460 | Each buffer has its own value of this variable."); | |
1461 | ||
1462 | DEFVAR_PER_BUFFER ("buffer-backed-up", ¤t_buffer->backed_up, | |
1463 | "Non-nil if this buffer's file has been backed up.\n\ | |
1464 | Backing up is done before the first time the file is saved.\n\ | |
1465 | Each buffer has its own value of this variable."); | |
1466 | ||
1467 | DEFVAR_PER_BUFFER ("buffer-saved-size", ¤t_buffer->save_length, | |
1468 | "Length of current buffer when last read in, saved or auto-saved.\n\ | |
1469 | 0 initially.\n\ | |
1470 | Each buffer has its own value of this variable."); | |
1471 | ||
1472 | DEFVAR_PER_BUFFER ("selective-display", ¤t_buffer->selective_display, | |
1473 | "Non-nil enables selective display:\n\ | |
1474 | Integer N as value means display only lines\n\ | |
1475 | that start with less than n columns of space.\n\ | |
1476 | A value of t means, after a ^M, all the rest of the line is invisible.\n\ | |
1477 | Then ^M's in the file are written into files as newlines.\n\n\ | |
1478 | Automatically becomes buffer-local when set in any fashion."); | |
1479 | ||
1480 | #ifndef old | |
1481 | DEFVAR_PER_BUFFER ("selective-display-ellipses", | |
1482 | ¤t_buffer->selective_display_ellipses, | |
1483 | "t means display ... on previous line when a line is invisible.\n\ | |
1484 | Automatically becomes buffer-local when set in any fashion."); | |
1485 | #endif | |
1486 | ||
1487 | DEFVAR_PER_BUFFER ("overwrite-mode", ¤t_buffer->overwrite_mode, | |
1488 | "Non-nil if self-insertion should replace existing text.\n\ | |
1489 | Automatically becomes buffer-local when set in any fashion."); | |
1490 | ||
1491 | DEFVAR_PER_BUFFER ("buffer-display-table", ¤t_buffer->display_table, | |
1492 | "Display table that controls display of the contents of current buffer.\n\ | |
1493 | Automatically becomes buffer-local when set in any fashion.\n\ | |
1494 | The display table is a vector created with `make-display-table'.\n\ | |
1495 | The first 256 elements control how to display each possible text character.\n\ | |
1496 | The value should be a \"rope\" (see `make-rope') or nil;\n\ | |
1497 | nil means display the character in the default fashion.\n\ | |
1498 | The remaining five elements are ropes that control the display of\n\ | |
1499 | the end of a truncated screen line (element 256);\n\ | |
1500 | the end of a continued line (element 257);\n\ | |
1501 | the escape character used to display character codes in octal (element 258);\n\ | |
1502 | the character used as an arrow for control characters (element 259);\n\ | |
1503 | the decoration indicating the presence of invisible lines (element 260).\n\ | |
1504 | If this variable is nil, the value of `standard-display-table' is used.\n\ | |
1505 | Each window can have its own, overriding display table."); | |
1506 | ||
1507 | DEFVAR_PER_BUFFER ("buffer-field-list", ¤t_buffer->fieldlist, | |
1508 | "List of fields in the current buffer. See `add-field'."); | |
1509 | ||
1510 | DEFVAR_BOOL ("check-protected-fields", check_protected_fields, | |
1511 | "Non-nil means don't allow modification of a protected field.\n\ | |
1512 | See `add-field'."); | |
1513 | check_protected_fields = 0; | |
1514 | ||
1515 | /*DEFVAR_LISP ("debug-check-symbol", &Vcheck_symbol, | |
1516 | "Don't ask."); | |
1517 | */ | |
1518 | DEFVAR_LISP ("bgfore-change-function", &Vbefore_change_function, | |
1519 | "Function to call before each text change.\n\ | |
1520 | Two arguments are passed to the function: the positions of\n\ | |
1521 | the beginning and end of the range of old text to be changed.\n\ | |
1522 | \(For an insertion, the beginning and end are at the same place.)\n\ | |
1523 | No information is given about the length of the text after the change.\n\ | |
1524 | position of the change\n\ | |
1525 | \n\ | |
1526 | While executing the `before-change-function', changes to buffers do not\n\ | |
1527 | cause calls to any `before-change-function' or `after-change-function'."); | |
1528 | Vbefore_change_function = Qnil; | |
1529 | ||
1530 | DEFVAR_LISP ("after-change-function", &Vafter_change_function, | |
1531 | "Function to call after each text change.\n\ | |
1532 | Three arguments are passed to the function: the positions of\n\ | |
1533 | the beginning and end of the range of changed text,\n\ | |
1534 | and the length of the pre-change text replaced by that range.\n\ | |
1535 | \(For an insertion, the pre-change length is zero;\n\ | |
1536 | for a deletion, that length is the number of characters deleted,\n\ | |
1537 | and the post-change beginning and end are at the same place.)\n\ | |
1538 | \n\ | |
1539 | While executing the `after-change-function', changes to buffers do not\n\ | |
1540 | cause calls to any `before-change-function' or `after-change-function'."); | |
1541 | Vafter_change_function = Qnil; | |
1542 | ||
1543 | DEFVAR_LISP ("first-change-function", &Vfirst_change_function, | |
1544 | "Function to call before changing a buffer which is unmodified.\n\ | |
1545 | The function is called, with no arguments, if it is non-nil."); | |
1546 | Vfirst_change_function = Qnil; | |
1547 | ||
1548 | DEFVAR_PER_BUFFER ("buffer-undo-list", ¤t_buffer->undo_list, | |
1549 | "List of undo entries in current buffer.\n\ | |
1550 | Recent changes come first; older changes follow newer.\n\ | |
1551 | \n\ | |
1552 | An entry (START . END) represents an insertion which begins at\n\ | |
1553 | position START and ends at position END.\n\ | |
1554 | \n\ | |
1555 | An entry (TEXT . POSITION) represents the deletion of the string TEXT\n\ | |
1556 | from (abs POSITION). If POSITION is positive, point was at the front\n\ | |
1557 | of the text being deleted; if negative, point was at the end.\n\ | |
1558 | \n\ | |
1559 | An entry (t HIGHWORD LOWWORD) indicates that the buffer had been\n\ | |
1560 | previously unmodified. HIGHWORD and LOWWORD are the high and low\n\ | |
1561 | 16-bit words of the buffer's modification count at the time. If the\n\ | |
1562 | modification count of the most recent save is different, this entry is\n\ | |
1563 | obsolete.\n\ | |
1564 | \n\ | |
1565 | nil marks undo boundaries. The undo command treats the changes\n\ | |
1566 | between two undo boundaries as a single step to be undone.\n\ | |
1567 | \n\ | |
1568 | If the value of the variable is t, undo information is not recorded.\n\ | |
1569 | "); | |
1570 | ||
1571 | defsubr (&Sbuffer_list); | |
1572 | defsubr (&Sget_buffer); | |
1573 | defsubr (&Sget_file_buffer); | |
1574 | defsubr (&Sget_buffer_create); | |
1575 | defsubr (&Sgenerate_new_buffer); | |
1576 | defsubr (&Sbuffer_name); | |
1577 | /*defsubr (&Sbuffer_number);*/ | |
1578 | defsubr (&Sbuffer_file_name); | |
1579 | defsubr (&Sbuffer_local_variables); | |
1580 | defsubr (&Sbuffer_modified_p); | |
1581 | defsubr (&Sset_buffer_modified_p); | |
1582 | defsubr (&Sbuffer_modified_tick); | |
1583 | defsubr (&Srename_buffer); | |
1584 | defsubr (&Sother_buffer); | |
1585 | defsubr (&Sbuffer_disable_undo); | |
1586 | defsubr (&Sbuffer_enable_undo); | |
1587 | defsubr (&Skill_buffer); | |
1588 | defsubr (&Serase_buffer); | |
1589 | defsubr (&Sswitch_to_buffer); | |
1590 | defsubr (&Spop_to_buffer); | |
1591 | defsubr (&Scurrent_buffer); | |
1592 | defsubr (&Sset_buffer); | |
1593 | defsubr (&Sbarf_if_buffer_read_only); | |
1594 | defsubr (&Sbury_buffer); | |
1595 | defsubr (&Slist_buffers); | |
1596 | defsubr (&Skill_all_local_variables); | |
1597 | defsubr (&Sregion_fields); | |
1598 | } | |
1599 | ||
1600 | keys_of_buffer () | |
1601 | { | |
1602 | initial_define_key (control_x_map, 'b', "switch-to-buffer"); | |
1603 | initial_define_key (control_x_map, 'k', "kill-buffer"); | |
1604 | initial_define_key (control_x_map, Ctl ('B'), "list-buffers"); | |
1605 | } |