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cd645247 | 1 | /* Simple built-in editing commands. |
c6c5df7f | 2 | Copyright (C) 1985, 1993 Free Software Foundation, Inc. |
cd645247 JB |
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 | |
502ddf23 | 8 | the Free Software Foundation; either version 2, or (at your option) |
cd645247 JB |
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 "config.h" | |
22 | #include "lisp.h" | |
23 | #include "commands.h" | |
24 | #include "buffer.h" | |
25 | #include "syntax.h" | |
26 | ||
27 | Lisp_Object Qkill_forward_chars, Qkill_backward_chars, Vblink_paren_function; | |
28 | ||
6bbb0d4a JB |
29 | /* A possible value for a buffer's overwrite-mode variable. */ |
30 | Lisp_Object Qoverwrite_mode_binary; | |
31 | ||
cd645247 JB |
32 | \f |
33 | DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "p", | |
34 | "Move point right ARG characters (left if ARG negative).\n\ | |
35 | On reaching end of buffer, stop and signal error.") | |
36 | (n) | |
37 | Lisp_Object n; | |
38 | { | |
265a9e55 | 39 | if (NILP (n)) |
cd645247 JB |
40 | XFASTINT (n) = 1; |
41 | else | |
42 | CHECK_NUMBER (n, 0); | |
43 | ||
7b502dc3 JB |
44 | /* This used to just set point to point + XINT (n), and then check |
45 | to see if it was within boundaries. But now that SET_PT can | |
46 | potentially do a lot of stuff (calling entering and exiting | |
47 | hooks, etcetera), that's not a good approach. So we validate the | |
48 | proposed position, then set point. */ | |
49 | { | |
50 | int new_point = point + XINT (n); | |
51 | ||
52 | if (new_point < BEGV) | |
53 | { | |
54 | SET_PT (BEGV); | |
55 | Fsignal (Qbeginning_of_buffer, Qnil); | |
56 | } | |
57 | if (new_point > ZV) | |
58 | { | |
59 | SET_PT (ZV); | |
60 | Fsignal (Qend_of_buffer, Qnil); | |
61 | } | |
62 | ||
63 | SET_PT (new_point); | |
64 | } | |
65 | ||
cd645247 JB |
66 | return Qnil; |
67 | } | |
68 | ||
69 | DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "p", | |
70 | "Move point left ARG characters (right if ARG negative).\n\ | |
71 | On attempt to pass beginning or end of buffer, stop and signal error.") | |
72 | (n) | |
73 | Lisp_Object n; | |
74 | { | |
265a9e55 | 75 | if (NILP (n)) |
cd645247 JB |
76 | XFASTINT (n) = 1; |
77 | else | |
78 | CHECK_NUMBER (n, 0); | |
79 | ||
80 | XSETINT (n, - XINT (n)); | |
81 | return Fforward_char (n); | |
82 | } | |
83 | ||
84 | DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 1, "p", | |
85 | "Move ARG lines forward (backward if ARG is negative).\n\ | |
86 | Precisely, if point is on line I, move to the start of line I + ARG.\n\ | |
87 | If there isn't room, go as far as possible (no error).\n\ | |
88 | Returns the count of lines left to move. If moving forward,\n\ | |
89 | that is ARG - number of lines moved; if backward, ARG + number moved.\n\ | |
90 | With positive ARG, a non-empty line at the end counts as one line\n\ | |
91 | successfully moved (for the return value).") | |
92 | (n) | |
93 | Lisp_Object n; | |
94 | { | |
95 | int pos2 = point; | |
96 | int pos; | |
97 | int count, shortage, negp; | |
98 | ||
265a9e55 | 99 | if (NILP (n)) |
cd645247 JB |
100 | count = 1; |
101 | else | |
102 | { | |
103 | CHECK_NUMBER (n, 0); | |
104 | count = XINT (n); | |
105 | } | |
106 | ||
107 | negp = count <= 0; | |
108 | pos = scan_buffer ('\n', pos2, count - negp, &shortage); | |
109 | if (shortage > 0 | |
110 | && (negp | |
502ddf23 JB |
111 | || (ZV > BEGV |
112 | && pos != pos2 | |
cd645247 JB |
113 | && FETCH_CHAR (pos - 1) != '\n'))) |
114 | shortage--; | |
115 | SET_PT (pos); | |
116 | return make_number (negp ? - shortage : shortage); | |
117 | } | |
118 | ||
119 | DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line, | |
120 | 0, 1, "p", | |
121 | "Move point to beginning of current line.\n\ | |
122 | With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\ | |
123 | If scan reaches end of buffer, stop there without error.") | |
124 | (n) | |
125 | Lisp_Object n; | |
126 | { | |
265a9e55 | 127 | if (NILP (n)) |
cd645247 JB |
128 | XFASTINT (n) = 1; |
129 | else | |
130 | CHECK_NUMBER (n, 0); | |
131 | ||
132 | Fforward_line (make_number (XINT (n) - 1)); | |
133 | return Qnil; | |
134 | } | |
135 | ||
136 | DEFUN ("end-of-line", Fend_of_line, Send_of_line, | |
137 | 0, 1, "p", | |
138 | "Move point to end of current line.\n\ | |
139 | With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\ | |
140 | If scan reaches end of buffer, stop there without error.") | |
141 | (n) | |
142 | Lisp_Object n; | |
143 | { | |
144 | register int pos; | |
145 | register int stop; | |
146 | ||
265a9e55 | 147 | if (NILP (n)) |
cd645247 JB |
148 | XFASTINT (n) = 1; |
149 | else | |
150 | CHECK_NUMBER (n, 0); | |
151 | ||
152 | if (XINT (n) != 1) | |
153 | Fforward_line (make_number (XINT (n) - 1)); | |
154 | ||
155 | pos = point; | |
156 | stop = ZV; | |
157 | while (pos < stop && FETCH_CHAR (pos) != '\n') pos++; | |
158 | SET_PT (pos); | |
159 | ||
160 | return Qnil; | |
161 | } | |
162 | ||
163 | DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP", | |
164 | "Delete the following ARG characters (previous, with negative arg).\n\ | |
165 | Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\ | |
166 | Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\ | |
167 | ARG was explicitly specified.") | |
168 | (n, killflag) | |
169 | Lisp_Object n, killflag; | |
170 | { | |
171 | CHECK_NUMBER (n, 0); | |
172 | ||
265a9e55 | 173 | if (NILP (killflag)) |
cd645247 JB |
174 | { |
175 | if (XINT (n) < 0) | |
176 | { | |
177 | if (point + XINT (n) < BEGV) | |
178 | Fsignal (Qbeginning_of_buffer, Qnil); | |
179 | else | |
180 | del_range (point + XINT (n), point); | |
181 | } | |
182 | else | |
183 | { | |
184 | if (point + XINT (n) > ZV) | |
185 | Fsignal (Qend_of_buffer, Qnil); | |
186 | else | |
187 | del_range (point, point + XINT (n)); | |
188 | } | |
189 | } | |
190 | else | |
191 | { | |
192 | call1 (Qkill_forward_chars, n); | |
193 | } | |
194 | return Qnil; | |
195 | } | |
196 | ||
197 | DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char, | |
198 | 1, 2, "p\nP", | |
199 | "Delete the previous ARG characters (following, with negative ARG).\n\ | |
200 | Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\ | |
201 | Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\ | |
202 | ARG was explicitly specified.") | |
203 | (n, killflag) | |
204 | Lisp_Object n, killflag; | |
205 | { | |
206 | CHECK_NUMBER (n, 0); | |
207 | return Fdelete_char (make_number (-XINT (n)), killflag); | |
208 | } | |
209 | ||
210 | DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "p", | |
211 | "Insert the character you type.\n\ | |
212 | Whichever character you type to run this command is inserted.") | |
213 | (arg) | |
214 | Lisp_Object arg; | |
215 | { | |
216 | CHECK_NUMBER (arg, 0); | |
217 | ||
218 | /* Barf if the key that invoked this was not a character. */ | |
219 | if (XTYPE (last_command_char) != Lisp_Int) | |
220 | bitch_at_user (); | |
221 | else | |
222 | while (XINT (arg) > 0) | |
223 | { | |
224 | XFASTINT (arg)--; /* Ok since old and new vals both nonneg */ | |
225 | internal_self_insert (XINT (last_command_char), XFASTINT (arg) != 0); | |
226 | } | |
227 | ||
228 | return Qnil; | |
229 | } | |
230 | ||
231 | DEFUN ("newline", Fnewline, Snewline, 0, 1, "P", | |
232 | "Insert a newline. With arg, insert that many newlines.\n\ | |
233 | In Auto Fill mode, if no numeric arg, break the preceding line if it's long.") | |
234 | (arg1) | |
235 | Lisp_Object arg1; | |
236 | { | |
237 | int flag; | |
238 | Lisp_Object arg; | |
239 | char c1 = '\n'; | |
240 | ||
241 | arg = Fprefix_numeric_value (arg1); | |
242 | ||
265a9e55 | 243 | if (!NILP (current_buffer->read_only)) |
cd645247 JB |
244 | Fsignal (Qbuffer_read_only, Qnil); |
245 | ||
c39e6cc2 JB |
246 | /* Inserting a newline at the end of a line produces better |
247 | redisplay in try_window_id than inserting at the ebginning fo a | |
248 | line, and the textual result is the same. So, if we're at | |
249 | beginning of line, pretend to be at the end of the previous line. | |
250 | ||
251 | We can't use internal_self_insert in that case since it won't do | |
252 | the insertion correctly. Luckily, internal_self_insert's special | |
253 | features all do nothing in that case. */ | |
cd645247 JB |
254 | |
255 | flag = point > BEGV && FETCH_CHAR (point - 1) == '\n'; | |
256 | if (flag) | |
257 | SET_PT (point - 1); | |
258 | ||
259 | while (XINT (arg) > 0) | |
260 | { | |
261 | if (flag) | |
262 | insert (&c1, 1); | |
263 | else | |
265a9e55 | 264 | internal_self_insert ('\n', !NILP (arg1)); |
cd645247 JB |
265 | XFASTINT (arg)--; /* Ok since old and new vals both nonneg */ |
266 | } | |
267 | ||
268 | if (flag) | |
269 | SET_PT (point + 1); | |
270 | ||
271 | return Qnil; | |
272 | } | |
273 | ||
4c6e656f RS |
274 | /* Insert character C1. If NOAUTOFILL is nonzero, don't do autofill |
275 | even if it is enabled. | |
276 | ||
277 | If this insertion is suitable for direct output (completely simple), | |
278 | return 0. A value of 1 indicates this *might* not have been simple. */ | |
279 | ||
cd645247 JB |
280 | internal_self_insert (c1, noautofill) |
281 | char c1; | |
282 | int noautofill; | |
283 | { | |
284 | extern Lisp_Object Fexpand_abbrev (); | |
285 | int hairy = 0; | |
286 | Lisp_Object tem; | |
287 | register enum syntaxcode synt; | |
288 | register int c = c1; | |
6bbb0d4a | 289 | Lisp_Object overwrite = current_buffer->overwrite_mode; |
cd645247 | 290 | |
265a9e55 | 291 | if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function)) |
cd645247 JB |
292 | hairy = 1; |
293 | ||
6bbb0d4a | 294 | if (!NILP (overwrite) |
cd645247 | 295 | && point < ZV |
6bbb0d4a JB |
296 | && (EQ (overwrite, Qoverwrite_mode_binary) |
297 | || (c != '\n' && FETCH_CHAR (point) != '\n')) | |
298 | && (EQ (overwrite, Qoverwrite_mode_binary) | |
e686c647 | 299 | || FETCH_CHAR (point) != '\t' |
cd645247 | 300 | || XINT (current_buffer->tab_width) <= 0 |
2234dd63 | 301 | || XFASTINT (current_buffer->tab_width) > 20 |
cd645247 JB |
302 | || !((current_column () + 1) % XFASTINT (current_buffer->tab_width)))) |
303 | { | |
304 | del_range (point, point + 1); | |
305 | hairy = 1; | |
306 | } | |
265a9e55 | 307 | if (!NILP (current_buffer->abbrev_mode) |
cd645247 | 308 | && SYNTAX (c) != Sword |
265a9e55 | 309 | && NILP (current_buffer->read_only) |
cd645247 JB |
310 | && point > BEGV && SYNTAX (FETCH_CHAR (point - 1)) == Sword) |
311 | { | |
ee8caabb | 312 | int modiff = MODIFF; |
4c6e656f RS |
313 | Fexpand_abbrev (); |
314 | /* We can't trust the value of Fexpand_abbrev, | |
ee8caabb RS |
315 | but if Fexpand_abbrev changed the buffer, |
316 | assume it expanded something. */ | |
317 | if (MODIFF != modiff) | |
cd645247 JB |
318 | hairy = 1; |
319 | } | |
320 | if ((c == ' ' || c == '\n') | |
321 | && !noautofill | |
265a9e55 | 322 | && !NILP (current_buffer->auto_fill_function) |
cd645247 JB |
323 | && current_column () > XFASTINT (current_buffer->fill_column)) |
324 | { | |
325 | if (c1 != '\n') | |
326 | insert (&c1, 1); | |
327 | call0 (current_buffer->auto_fill_function); | |
328 | if (c1 == '\n') | |
329 | insert (&c1, 1); | |
330 | hairy = 1; | |
331 | } | |
332 | else | |
333 | insert (&c1, 1); | |
334 | synt = SYNTAX (c); | |
335 | if ((synt == Sclose || synt == Smath) | |
265a9e55 | 336 | && !NILP (Vblink_paren_function) && INTERACTIVE) |
cd645247 JB |
337 | { |
338 | call0 (Vblink_paren_function); | |
339 | hairy = 1; | |
340 | } | |
341 | return hairy; | |
342 | } | |
343 | \f | |
344 | /* module initialization */ | |
345 | ||
346 | syms_of_cmds () | |
347 | { | |
348 | Qkill_backward_chars = intern ("kill-backward-chars"); | |
349 | staticpro (&Qkill_backward_chars); | |
350 | ||
351 | Qkill_forward_chars = intern ("kill-forward-chars"); | |
352 | staticpro (&Qkill_forward_chars); | |
353 | ||
6bbb0d4a JB |
354 | Qoverwrite_mode_binary = intern ("overwrite-mode-binary"); |
355 | staticpro (&Qoverwrite_mode_binary); | |
e686c647 | 356 | |
cd645247 JB |
357 | DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function, |
358 | "Function called, if non-nil, whenever a close parenthesis is inserted.\n\ | |
359 | More precisely, a char with closeparen syntax is self-inserted."); | |
360 | Vblink_paren_function = Qnil; | |
361 | ||
362 | defsubr (&Sforward_char); | |
363 | defsubr (&Sbackward_char); | |
364 | defsubr (&Sforward_line); | |
365 | defsubr (&Sbeginning_of_line); | |
366 | defsubr (&Send_of_line); | |
367 | ||
368 | defsubr (&Sdelete_char); | |
369 | defsubr (&Sdelete_backward_char); | |
370 | ||
371 | defsubr (&Sself_insert_command); | |
372 | defsubr (&Snewline); | |
373 | } | |
374 | ||
375 | keys_of_cmds () | |
376 | { | |
377 | int n; | |
378 | ||
379 | initial_define_key (global_map, Ctl('M'), "newline"); | |
380 | initial_define_key (global_map, Ctl('I'), "self-insert-command"); | |
381 | for (n = 040; n < 0177; n++) | |
382 | initial_define_key (global_map, n, "self-insert-command"); | |
383 | ||
384 | initial_define_key (global_map, Ctl ('A'), "beginning-of-line"); | |
385 | initial_define_key (global_map, Ctl ('B'), "backward-char"); | |
386 | initial_define_key (global_map, Ctl ('D'), "delete-char"); | |
387 | initial_define_key (global_map, Ctl ('E'), "end-of-line"); | |
388 | initial_define_key (global_map, Ctl ('F'), "forward-char"); | |
389 | initial_define_key (global_map, 0177, "delete-backward-char"); | |
390 | } |