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cd645247 | 1 | /* Simple built-in editing commands. |
502ddf23 | 2 | Copyright (C) 1985, 1992 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 | ||
e686c647 | 29 | int overwrite_binary_mode; |
cd645247 JB |
30 | \f |
31 | DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "p", | |
32 | "Move point right ARG characters (left if ARG negative).\n\ | |
33 | On reaching end of buffer, stop and signal error.") | |
34 | (n) | |
35 | Lisp_Object n; | |
36 | { | |
265a9e55 | 37 | if (NILP (n)) |
cd645247 JB |
38 | XFASTINT (n) = 1; |
39 | else | |
40 | CHECK_NUMBER (n, 0); | |
41 | ||
42 | SET_PT (point + XINT (n)); | |
43 | if (point < BEGV) | |
44 | { | |
45 | SET_PT (BEGV); | |
46 | Fsignal (Qbeginning_of_buffer, Qnil); | |
47 | } | |
48 | if (point > ZV) | |
49 | { | |
50 | SET_PT (ZV); | |
51 | Fsignal (Qend_of_buffer, Qnil); | |
52 | } | |
53 | return Qnil; | |
54 | } | |
55 | ||
56 | DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "p", | |
57 | "Move point left ARG characters (right if ARG negative).\n\ | |
58 | On attempt to pass beginning or end of buffer, stop and signal error.") | |
59 | (n) | |
60 | Lisp_Object n; | |
61 | { | |
265a9e55 | 62 | if (NILP (n)) |
cd645247 JB |
63 | XFASTINT (n) = 1; |
64 | else | |
65 | CHECK_NUMBER (n, 0); | |
66 | ||
67 | XSETINT (n, - XINT (n)); | |
68 | return Fforward_char (n); | |
69 | } | |
70 | ||
71 | DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 1, "p", | |
72 | "Move ARG lines forward (backward if ARG is negative).\n\ | |
73 | Precisely, if point is on line I, move to the start of line I + ARG.\n\ | |
74 | If there isn't room, go as far as possible (no error).\n\ | |
75 | Returns the count of lines left to move. If moving forward,\n\ | |
76 | that is ARG - number of lines moved; if backward, ARG + number moved.\n\ | |
77 | With positive ARG, a non-empty line at the end counts as one line\n\ | |
78 | successfully moved (for the return value).") | |
79 | (n) | |
80 | Lisp_Object n; | |
81 | { | |
82 | int pos2 = point; | |
83 | int pos; | |
84 | int count, shortage, negp; | |
85 | ||
265a9e55 | 86 | if (NILP (n)) |
cd645247 JB |
87 | count = 1; |
88 | else | |
89 | { | |
90 | CHECK_NUMBER (n, 0); | |
91 | count = XINT (n); | |
92 | } | |
93 | ||
94 | negp = count <= 0; | |
95 | pos = scan_buffer ('\n', pos2, count - negp, &shortage); | |
96 | if (shortage > 0 | |
97 | && (negp | |
502ddf23 JB |
98 | || (ZV > BEGV |
99 | && pos != pos2 | |
cd645247 JB |
100 | && FETCH_CHAR (pos - 1) != '\n'))) |
101 | shortage--; | |
102 | SET_PT (pos); | |
103 | return make_number (negp ? - shortage : shortage); | |
104 | } | |
105 | ||
106 | DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line, | |
107 | 0, 1, "p", | |
108 | "Move point to beginning of current line.\n\ | |
109 | With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\ | |
110 | If scan reaches end of buffer, stop there without error.") | |
111 | (n) | |
112 | Lisp_Object n; | |
113 | { | |
265a9e55 | 114 | if (NILP (n)) |
cd645247 JB |
115 | XFASTINT (n) = 1; |
116 | else | |
117 | CHECK_NUMBER (n, 0); | |
118 | ||
119 | Fforward_line (make_number (XINT (n) - 1)); | |
120 | return Qnil; | |
121 | } | |
122 | ||
123 | DEFUN ("end-of-line", Fend_of_line, Send_of_line, | |
124 | 0, 1, "p", | |
125 | "Move point to end of current line.\n\ | |
126 | With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\ | |
127 | If scan reaches end of buffer, stop there without error.") | |
128 | (n) | |
129 | Lisp_Object n; | |
130 | { | |
131 | register int pos; | |
132 | register int stop; | |
133 | ||
265a9e55 | 134 | if (NILP (n)) |
cd645247 JB |
135 | XFASTINT (n) = 1; |
136 | else | |
137 | CHECK_NUMBER (n, 0); | |
138 | ||
139 | if (XINT (n) != 1) | |
140 | Fforward_line (make_number (XINT (n) - 1)); | |
141 | ||
142 | pos = point; | |
143 | stop = ZV; | |
144 | while (pos < stop && FETCH_CHAR (pos) != '\n') pos++; | |
145 | SET_PT (pos); | |
146 | ||
147 | return Qnil; | |
148 | } | |
149 | ||
150 | DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP", | |
151 | "Delete the following ARG characters (previous, with negative arg).\n\ | |
152 | Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\ | |
153 | Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\ | |
154 | ARG was explicitly specified.") | |
155 | (n, killflag) | |
156 | Lisp_Object n, killflag; | |
157 | { | |
158 | CHECK_NUMBER (n, 0); | |
159 | ||
265a9e55 | 160 | if (NILP (killflag)) |
cd645247 JB |
161 | { |
162 | if (XINT (n) < 0) | |
163 | { | |
164 | if (point + XINT (n) < BEGV) | |
165 | Fsignal (Qbeginning_of_buffer, Qnil); | |
166 | else | |
167 | del_range (point + XINT (n), point); | |
168 | } | |
169 | else | |
170 | { | |
171 | if (point + XINT (n) > ZV) | |
172 | Fsignal (Qend_of_buffer, Qnil); | |
173 | else | |
174 | del_range (point, point + XINT (n)); | |
175 | } | |
176 | } | |
177 | else | |
178 | { | |
179 | call1 (Qkill_forward_chars, n); | |
180 | } | |
181 | return Qnil; | |
182 | } | |
183 | ||
184 | DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char, | |
185 | 1, 2, "p\nP", | |
186 | "Delete the previous ARG characters (following, with negative ARG).\n\ | |
187 | Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\ | |
188 | Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\ | |
189 | ARG was explicitly specified.") | |
190 | (n, killflag) | |
191 | Lisp_Object n, killflag; | |
192 | { | |
193 | CHECK_NUMBER (n, 0); | |
194 | return Fdelete_char (make_number (-XINT (n)), killflag); | |
195 | } | |
196 | ||
197 | DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "p", | |
198 | "Insert the character you type.\n\ | |
199 | Whichever character you type to run this command is inserted.") | |
200 | (arg) | |
201 | Lisp_Object arg; | |
202 | { | |
203 | CHECK_NUMBER (arg, 0); | |
204 | ||
205 | /* Barf if the key that invoked this was not a character. */ | |
206 | if (XTYPE (last_command_char) != Lisp_Int) | |
207 | bitch_at_user (); | |
208 | else | |
209 | while (XINT (arg) > 0) | |
210 | { | |
211 | XFASTINT (arg)--; /* Ok since old and new vals both nonneg */ | |
212 | internal_self_insert (XINT (last_command_char), XFASTINT (arg) != 0); | |
213 | } | |
214 | ||
215 | return Qnil; | |
216 | } | |
217 | ||
218 | DEFUN ("newline", Fnewline, Snewline, 0, 1, "P", | |
219 | "Insert a newline. With arg, insert that many newlines.\n\ | |
220 | In Auto Fill mode, if no numeric arg, break the preceding line if it's long.") | |
221 | (arg1) | |
222 | Lisp_Object arg1; | |
223 | { | |
224 | int flag; | |
225 | Lisp_Object arg; | |
226 | char c1 = '\n'; | |
227 | ||
228 | arg = Fprefix_numeric_value (arg1); | |
229 | ||
265a9e55 | 230 | if (!NILP (current_buffer->read_only)) |
cd645247 JB |
231 | Fsignal (Qbuffer_read_only, Qnil); |
232 | ||
c39e6cc2 JB |
233 | /* Inserting a newline at the end of a line produces better |
234 | redisplay in try_window_id than inserting at the ebginning fo a | |
235 | line, and the textual result is the same. So, if we're at | |
236 | beginning of line, pretend to be at the end of the previous line. | |
237 | ||
238 | We can't use internal_self_insert in that case since it won't do | |
239 | the insertion correctly. Luckily, internal_self_insert's special | |
240 | features all do nothing in that case. */ | |
cd645247 JB |
241 | |
242 | flag = point > BEGV && FETCH_CHAR (point - 1) == '\n'; | |
243 | if (flag) | |
244 | SET_PT (point - 1); | |
245 | ||
246 | while (XINT (arg) > 0) | |
247 | { | |
248 | if (flag) | |
249 | insert (&c1, 1); | |
250 | else | |
265a9e55 | 251 | internal_self_insert ('\n', !NILP (arg1)); |
cd645247 JB |
252 | XFASTINT (arg)--; /* Ok since old and new vals both nonneg */ |
253 | } | |
254 | ||
255 | if (flag) | |
256 | SET_PT (point + 1); | |
257 | ||
258 | return Qnil; | |
259 | } | |
260 | ||
4c6e656f RS |
261 | /* Insert character C1. If NOAUTOFILL is nonzero, don't do autofill |
262 | even if it is enabled. | |
263 | ||
264 | If this insertion is suitable for direct output (completely simple), | |
265 | return 0. A value of 1 indicates this *might* not have been simple. */ | |
266 | ||
cd645247 JB |
267 | internal_self_insert (c1, noautofill) |
268 | char c1; | |
269 | int noautofill; | |
270 | { | |
271 | extern Lisp_Object Fexpand_abbrev (); | |
272 | int hairy = 0; | |
273 | Lisp_Object tem; | |
274 | register enum syntaxcode synt; | |
275 | register int c = c1; | |
276 | ||
265a9e55 | 277 | if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function)) |
cd645247 JB |
278 | hairy = 1; |
279 | ||
265a9e55 | 280 | if (!NILP (current_buffer->overwrite_mode) |
cd645247 | 281 | && point < ZV |
e686c647 RS |
282 | && (overwrite_binary_mode || (c != '\n' && FETCH_CHAR (point) != '\n')) |
283 | && (overwrite_binary_mode | |
284 | || FETCH_CHAR (point) != '\t' | |
cd645247 JB |
285 | || XINT (current_buffer->tab_width) <= 0 |
286 | || !((current_column () + 1) % XFASTINT (current_buffer->tab_width)))) | |
287 | { | |
288 | del_range (point, point + 1); | |
289 | hairy = 1; | |
290 | } | |
265a9e55 | 291 | if (!NILP (current_buffer->abbrev_mode) |
cd645247 | 292 | && SYNTAX (c) != Sword |
265a9e55 | 293 | && NILP (current_buffer->read_only) |
cd645247 JB |
294 | && point > BEGV && SYNTAX (FETCH_CHAR (point - 1)) == Sword) |
295 | { | |
ee8caabb | 296 | int modiff = MODIFF; |
4c6e656f RS |
297 | Fexpand_abbrev (); |
298 | /* We can't trust the value of Fexpand_abbrev, | |
ee8caabb RS |
299 | but if Fexpand_abbrev changed the buffer, |
300 | assume it expanded something. */ | |
301 | if (MODIFF != modiff) | |
cd645247 JB |
302 | hairy = 1; |
303 | } | |
304 | if ((c == ' ' || c == '\n') | |
305 | && !noautofill | |
265a9e55 | 306 | && !NILP (current_buffer->auto_fill_function) |
cd645247 JB |
307 | && current_column () > XFASTINT (current_buffer->fill_column)) |
308 | { | |
309 | if (c1 != '\n') | |
310 | insert (&c1, 1); | |
311 | call0 (current_buffer->auto_fill_function); | |
312 | if (c1 == '\n') | |
313 | insert (&c1, 1); | |
314 | hairy = 1; | |
315 | } | |
316 | else | |
317 | insert (&c1, 1); | |
318 | synt = SYNTAX (c); | |
319 | if ((synt == Sclose || synt == Smath) | |
265a9e55 | 320 | && !NILP (Vblink_paren_function) && INTERACTIVE) |
cd645247 JB |
321 | { |
322 | call0 (Vblink_paren_function); | |
323 | hairy = 1; | |
324 | } | |
325 | return hairy; | |
326 | } | |
327 | \f | |
328 | /* module initialization */ | |
329 | ||
330 | syms_of_cmds () | |
331 | { | |
332 | Qkill_backward_chars = intern ("kill-backward-chars"); | |
333 | staticpro (&Qkill_backward_chars); | |
334 | ||
335 | Qkill_forward_chars = intern ("kill-forward-chars"); | |
336 | staticpro (&Qkill_forward_chars); | |
337 | ||
e686c647 RS |
338 | DEFVAR_BOOL ("overwrite-binary-mode", &overwrite_binary_mode, |
339 | "*Non-nil means overwrite mode treats tab and newline normally.\n\ | |
340 | Ordinarily, overwriting preserves a tab until its whole width is overwritten\n\ | |
341 | and never replaces a newline."); | |
a7b19b15 | 342 | overwrite_binary_mode = 1; |
e686c647 | 343 | |
cd645247 JB |
344 | DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function, |
345 | "Function called, if non-nil, whenever a close parenthesis is inserted.\n\ | |
346 | More precisely, a char with closeparen syntax is self-inserted."); | |
347 | Vblink_paren_function = Qnil; | |
348 | ||
349 | defsubr (&Sforward_char); | |
350 | defsubr (&Sbackward_char); | |
351 | defsubr (&Sforward_line); | |
352 | defsubr (&Sbeginning_of_line); | |
353 | defsubr (&Send_of_line); | |
354 | ||
355 | defsubr (&Sdelete_char); | |
356 | defsubr (&Sdelete_backward_char); | |
357 | ||
358 | defsubr (&Sself_insert_command); | |
359 | defsubr (&Snewline); | |
360 | } | |
361 | ||
362 | keys_of_cmds () | |
363 | { | |
364 | int n; | |
365 | ||
366 | initial_define_key (global_map, Ctl('M'), "newline"); | |
367 | initial_define_key (global_map, Ctl('I'), "self-insert-command"); | |
368 | for (n = 040; n < 0177; n++) | |
369 | initial_define_key (global_map, n, "self-insert-command"); | |
370 | ||
371 | initial_define_key (global_map, Ctl ('A'), "beginning-of-line"); | |
372 | initial_define_key (global_map, Ctl ('B'), "backward-char"); | |
373 | initial_define_key (global_map, Ctl ('D'), "delete-char"); | |
374 | initial_define_key (global_map, Ctl ('E'), "end-of-line"); | |
375 | initial_define_key (global_map, Ctl ('F'), "forward-char"); | |
376 | initial_define_key (global_map, 0177, "delete-backward-char"); | |
377 | } |