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d60d9f65 SS |
1 | /* kill.c -- kill ring management. */ |
2 | ||
3 | /* Copyright (C) 1994 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of the GNU Readline Library, a library for | |
6 | reading lines of text with interactive input and history editing. | |
7 | ||
8 | The GNU Readline Library is free software; you can redistribute it | |
9 | and/or modify it under the terms of the GNU General Public License | |
1b17e766 | 10 | as published by the Free Software Foundation; either version 2, or |
d60d9f65 SS |
11 | (at your option) any later version. |
12 | ||
13 | The GNU Readline Library is distributed in the hope that it will be | |
14 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty | |
15 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | The GNU General Public License is often shipped with GNU software, and | |
19 | is generally kept in a file called COPYING or LICENSE. If you do not | |
20 | have a copy of the license, write to the Free Software Foundation, | |
1b17e766 | 21 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
d60d9f65 SS |
22 | #define READLINE_LIBRARY |
23 | ||
24 | #if defined (HAVE_CONFIG_H) | |
25 | # include <config.h> | |
26 | #endif | |
27 | ||
28 | #include <sys/types.h> | |
29 | ||
30 | #if defined (HAVE_UNISTD_H) | |
31 | # include <unistd.h> /* for _POSIX_VERSION */ | |
32 | #endif /* HAVE_UNISTD_H */ | |
33 | ||
34 | #if defined (HAVE_STDLIB_H) | |
35 | # include <stdlib.h> | |
36 | #else | |
37 | # include "ansi_stdlib.h" | |
38 | #endif /* HAVE_STDLIB_H */ | |
39 | ||
40 | #include <stdio.h> | |
41 | ||
42 | /* System-specific feature definitions and include files. */ | |
43 | #include "rldefs.h" | |
44 | ||
45 | /* Some standard library routines. */ | |
46 | #include "readline.h" | |
47 | #include "history.h" | |
48 | ||
1b17e766 EZ |
49 | #include "rlprivate.h" |
50 | #include "xmalloc.h" | |
d60d9f65 SS |
51 | |
52 | /* **************************************************************** */ | |
53 | /* */ | |
54 | /* Killing Mechanism */ | |
55 | /* */ | |
56 | /* **************************************************************** */ | |
57 | ||
58 | /* What we assume for a max number of kills. */ | |
59 | #define DEFAULT_MAX_KILLS 10 | |
60 | ||
61 | /* The real variable to look at to find out when to flush kills. */ | |
62 | static int rl_max_kills = DEFAULT_MAX_KILLS; | |
63 | ||
64 | /* Where to store killed text. */ | |
65 | static char **rl_kill_ring = (char **)NULL; | |
66 | ||
67 | /* Where we are in the kill ring. */ | |
68 | static int rl_kill_index; | |
69 | ||
70 | /* How many slots we have in the kill ring. */ | |
71 | static int rl_kill_ring_length; | |
72 | ||
73 | /* How to say that you only want to save a certain amount | |
74 | of kill material. */ | |
75 | int | |
76 | rl_set_retained_kills (num) | |
77 | int num; | |
78 | { | |
79 | return 0; | |
80 | } | |
81 | ||
82 | /* Add TEXT to the kill ring, allocating a new kill ring slot as necessary. | |
83 | This uses TEXT directly, so the caller must not free it. If APPEND is | |
84 | non-zero, and the last command was a kill, the text is appended to the | |
85 | current kill ring slot, otherwise prepended. */ | |
86 | static int | |
87 | _rl_copy_to_kill_ring (text, append) | |
88 | char *text; | |
89 | int append; | |
90 | { | |
91 | char *old, *new; | |
92 | int slot; | |
93 | ||
94 | /* First, find the slot to work with. */ | |
95 | if (_rl_last_command_was_kill == 0) | |
96 | { | |
97 | /* Get a new slot. */ | |
98 | if (rl_kill_ring == 0) | |
99 | { | |
100 | /* If we don't have any defined, then make one. */ | |
101 | rl_kill_ring = (char **) | |
102 | xmalloc (((rl_kill_ring_length = 1) + 1) * sizeof (char *)); | |
103 | rl_kill_ring[slot = 0] = (char *)NULL; | |
104 | } | |
105 | else | |
106 | { | |
107 | /* We have to add a new slot on the end, unless we have | |
108 | exceeded the max limit for remembering kills. */ | |
109 | slot = rl_kill_ring_length; | |
110 | if (slot == rl_max_kills) | |
111 | { | |
112 | register int i; | |
113 | free (rl_kill_ring[0]); | |
114 | for (i = 0; i < slot; i++) | |
115 | rl_kill_ring[i] = rl_kill_ring[i + 1]; | |
116 | } | |
117 | else | |
118 | { | |
119 | slot = rl_kill_ring_length += 1; | |
120 | rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *)); | |
121 | } | |
122 | rl_kill_ring[--slot] = (char *)NULL; | |
123 | } | |
124 | } | |
125 | else | |
126 | slot = rl_kill_ring_length - 1; | |
127 | ||
128 | /* If the last command was a kill, prepend or append. */ | |
129 | if (_rl_last_command_was_kill && rl_editing_mode != vi_mode) | |
130 | { | |
131 | old = rl_kill_ring[slot]; | |
132 | new = xmalloc (1 + strlen (old) + strlen (text)); | |
133 | ||
134 | if (append) | |
135 | { | |
136 | strcpy (new, old); | |
137 | strcat (new, text); | |
138 | } | |
139 | else | |
140 | { | |
141 | strcpy (new, text); | |
142 | strcat (new, old); | |
143 | } | |
144 | free (old); | |
145 | free (text); | |
146 | rl_kill_ring[slot] = new; | |
147 | } | |
148 | else | |
149 | rl_kill_ring[slot] = text; | |
150 | ||
151 | rl_kill_index = slot; | |
152 | return 0; | |
153 | } | |
154 | ||
155 | /* The way to kill something. This appends or prepends to the last | |
156 | kill, if the last command was a kill command. if FROM is less | |
157 | than TO, then the text is appended, otherwise prepended. If the | |
158 | last command was not a kill command, then a new slot is made for | |
159 | this kill. */ | |
160 | int | |
161 | rl_kill_text (from, to) | |
162 | int from, to; | |
163 | { | |
164 | char *text; | |
165 | ||
166 | /* Is there anything to kill? */ | |
167 | if (from == to) | |
168 | { | |
169 | _rl_last_command_was_kill++; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | text = rl_copy_text (from, to); | |
174 | ||
175 | /* Delete the copied text from the line. */ | |
176 | rl_delete_text (from, to); | |
177 | ||
178 | _rl_copy_to_kill_ring (text, from < to); | |
179 | ||
180 | _rl_last_command_was_kill++; | |
181 | return 0; | |
182 | } | |
183 | ||
184 | /* Now REMEMBER! In order to do prepending or appending correctly, kill | |
185 | commands always make rl_point's original position be the FROM argument, | |
186 | and rl_point's extent be the TO argument. */ | |
187 | ||
188 | /* **************************************************************** */ | |
189 | /* */ | |
190 | /* Killing Commands */ | |
191 | /* */ | |
192 | /* **************************************************************** */ | |
193 | ||
194 | /* Delete the word at point, saving the text in the kill ring. */ | |
195 | int | |
196 | rl_kill_word (count, key) | |
197 | int count, key; | |
198 | { | |
199 | int orig_point = rl_point; | |
200 | ||
201 | if (count < 0) | |
202 | return (rl_backward_kill_word (-count, key)); | |
203 | else | |
204 | { | |
205 | rl_forward_word (count, key); | |
206 | ||
207 | if (rl_point != orig_point) | |
208 | rl_kill_text (orig_point, rl_point); | |
209 | ||
210 | rl_point = orig_point; | |
211 | } | |
212 | return 0; | |
213 | } | |
214 | ||
215 | /* Rubout the word before point, placing it on the kill ring. */ | |
216 | int | |
217 | rl_backward_kill_word (count, ignore) | |
218 | int count, ignore; | |
219 | { | |
220 | int orig_point = rl_point; | |
221 | ||
222 | if (count < 0) | |
223 | return (rl_kill_word (-count, ignore)); | |
224 | else | |
225 | { | |
226 | rl_backward_word (count, ignore); | |
227 | ||
228 | if (rl_point != orig_point) | |
229 | rl_kill_text (orig_point, rl_point); | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
234 | /* Kill from here to the end of the line. If DIRECTION is negative, kill | |
235 | back to the line start instead. */ | |
236 | int | |
237 | rl_kill_line (direction, ignore) | |
238 | int direction, ignore; | |
239 | { | |
240 | int orig_point = rl_point; | |
241 | ||
242 | if (direction < 0) | |
243 | return (rl_backward_kill_line (1, ignore)); | |
244 | else | |
245 | { | |
246 | rl_end_of_line (1, ignore); | |
247 | if (orig_point != rl_point) | |
248 | rl_kill_text (orig_point, rl_point); | |
249 | rl_point = orig_point; | |
250 | } | |
251 | return 0; | |
252 | } | |
253 | ||
254 | /* Kill backwards to the start of the line. If DIRECTION is negative, kill | |
255 | forwards to the line end instead. */ | |
256 | int | |
257 | rl_backward_kill_line (direction, ignore) | |
258 | int direction, ignore; | |
259 | { | |
260 | int orig_point = rl_point; | |
261 | ||
262 | if (direction < 0) | |
263 | return (rl_kill_line (1, ignore)); | |
264 | else | |
265 | { | |
266 | if (!rl_point) | |
267 | ding (); | |
268 | else | |
269 | { | |
270 | rl_beg_of_line (1, ignore); | |
271 | rl_kill_text (orig_point, rl_point); | |
272 | } | |
273 | } | |
274 | return 0; | |
275 | } | |
276 | ||
277 | /* Kill the whole line, no matter where point is. */ | |
278 | int | |
279 | rl_kill_full_line (count, ignore) | |
280 | int count, ignore; | |
281 | { | |
282 | rl_begin_undo_group (); | |
283 | rl_point = 0; | |
284 | rl_kill_text (rl_point, rl_end); | |
285 | rl_end_undo_group (); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | /* The next two functions mimic unix line editing behaviour, except they | |
290 | save the deleted text on the kill ring. This is safer than not saving | |
291 | it, and since we have a ring, nobody should get screwed. */ | |
292 | ||
293 | /* This does what C-w does in Unix. We can't prevent people from | |
294 | using behaviour that they expect. */ | |
295 | int | |
296 | rl_unix_word_rubout (count, key) | |
297 | int count, key; | |
298 | { | |
299 | int orig_point; | |
300 | ||
301 | if (rl_point == 0) | |
302 | ding (); | |
303 | else | |
304 | { | |
305 | orig_point = rl_point; | |
306 | if (count <= 0) | |
307 | count = 1; | |
308 | ||
309 | while (count--) | |
310 | { | |
311 | while (rl_point && whitespace (rl_line_buffer[rl_point - 1])) | |
312 | rl_point--; | |
313 | ||
314 | while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0)) | |
315 | rl_point--; | |
316 | } | |
317 | ||
318 | rl_kill_text (orig_point, rl_point); | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | /* Here is C-u doing what Unix does. You don't *have* to use these | |
324 | key-bindings. We have a choice of killing the entire line, or | |
325 | killing from where we are to the start of the line. We choose the | |
326 | latter, because if you are a Unix weenie, then you haven't backspaced | |
327 | into the line at all, and if you aren't, then you know what you are | |
328 | doing. */ | |
329 | int | |
330 | rl_unix_line_discard (count, key) | |
331 | int count, key; | |
332 | { | |
333 | if (rl_point == 0) | |
334 | ding (); | |
335 | else | |
336 | { | |
337 | rl_kill_text (rl_point, 0); | |
338 | rl_point = 0; | |
339 | } | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* Copy the text in the `region' to the kill ring. If DELETE is non-zero, | |
344 | delete the text from the line as well. */ | |
345 | static int | |
346 | region_kill_internal (delete) | |
347 | int delete; | |
348 | { | |
349 | char *text; | |
350 | ||
351 | if (rl_mark == rl_point) | |
352 | { | |
353 | _rl_last_command_was_kill++; | |
354 | return 0; | |
355 | } | |
356 | ||
357 | text = rl_copy_text (rl_point, rl_mark); | |
358 | if (delete) | |
359 | rl_delete_text (rl_point, rl_mark); | |
360 | _rl_copy_to_kill_ring (text, rl_point < rl_mark); | |
361 | ||
362 | _rl_last_command_was_kill++; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | /* Copy the text in the region to the kill ring. */ | |
367 | int | |
368 | rl_copy_region_to_kill (count, ignore) | |
369 | int count, ignore; | |
370 | { | |
371 | return (region_kill_internal (0)); | |
372 | } | |
373 | ||
374 | /* Kill the text between the point and mark. */ | |
375 | int | |
376 | rl_kill_region (count, ignore) | |
377 | int count, ignore; | |
378 | { | |
1b17e766 | 379 | int r, npoint; |
d60d9f65 | 380 | |
1b17e766 | 381 | npoint = (rl_point < rl_mark) ? rl_point : rl_mark; |
d60d9f65 SS |
382 | r = region_kill_internal (1); |
383 | _rl_fix_point (1); | |
1b17e766 | 384 | rl_point = npoint; |
d60d9f65 SS |
385 | return r; |
386 | } | |
387 | ||
388 | /* Copy COUNT words to the kill ring. DIR says which direction we look | |
389 | to find the words. */ | |
390 | static int | |
391 | _rl_copy_word_as_kill (count, dir) | |
392 | int count, dir; | |
393 | { | |
394 | int om, op, r; | |
395 | ||
396 | om = rl_mark; | |
397 | op = rl_point; | |
398 | ||
399 | if (dir > 0) | |
400 | rl_forward_word (count, 0); | |
401 | else | |
402 | rl_backward_word (count, 0); | |
403 | ||
404 | rl_mark = rl_point; | |
405 | ||
406 | if (dir > 0) | |
407 | rl_backward_word (count, 0); | |
408 | else | |
409 | rl_forward_word (count, 0); | |
410 | ||
411 | r = region_kill_internal (0); | |
412 | ||
413 | rl_mark = om; | |
414 | rl_point = op; | |
415 | ||
416 | return r; | |
417 | } | |
418 | ||
419 | int | |
420 | rl_copy_forward_word (count, key) | |
421 | int count, key; | |
422 | { | |
423 | if (count < 0) | |
424 | return (rl_copy_backward_word (-count, key)); | |
425 | ||
426 | return (_rl_copy_word_as_kill (count, 1)); | |
427 | } | |
428 | ||
429 | int | |
430 | rl_copy_backward_word (count, key) | |
431 | int count, key; | |
432 | { | |
433 | if (count < 0) | |
434 | return (rl_copy_forward_word (-count, key)); | |
435 | ||
436 | return (_rl_copy_word_as_kill (count, -1)); | |
437 | } | |
438 | ||
439 | /* Yank back the last killed text. This ignores arguments. */ | |
440 | int | |
441 | rl_yank (count, ignore) | |
442 | int count, ignore; | |
443 | { | |
444 | if (rl_kill_ring == 0) | |
445 | { | |
446 | _rl_abort_internal (); | |
447 | return -1; | |
448 | } | |
449 | ||
450 | _rl_set_mark_at_pos (rl_point); | |
451 | rl_insert_text (rl_kill_ring[rl_kill_index]); | |
452 | return 0; | |
453 | } | |
454 | ||
455 | /* If the last command was yank, or yank_pop, and the text just | |
456 | before point is identical to the current kill item, then | |
457 | delete that text from the line, rotate the index down, and | |
458 | yank back some other text. */ | |
459 | int | |
460 | rl_yank_pop (count, key) | |
461 | int count, key; | |
462 | { | |
463 | int l, n; | |
464 | ||
465 | if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) || | |
466 | !rl_kill_ring) | |
467 | { | |
468 | _rl_abort_internal (); | |
469 | return -1; | |
470 | } | |
471 | ||
472 | l = strlen (rl_kill_ring[rl_kill_index]); | |
473 | n = rl_point - l; | |
474 | if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l)) | |
475 | { | |
476 | rl_delete_text (n, rl_point); | |
477 | rl_point = n; | |
478 | rl_kill_index--; | |
479 | if (rl_kill_index < 0) | |
480 | rl_kill_index = rl_kill_ring_length - 1; | |
481 | rl_yank (1, 0); | |
482 | return 0; | |
483 | } | |
484 | else | |
485 | { | |
486 | _rl_abort_internal (); | |
487 | return -1; | |
488 | } | |
489 | } | |
490 | ||
491 | /* Yank the COUNTh argument from the previous history line, skipping | |
492 | HISTORY_SKIP lines before looking for the `previous line'. */ | |
493 | static int | |
494 | rl_yank_nth_arg_internal (count, ignore, history_skip) | |
495 | int count, ignore, history_skip; | |
496 | { | |
497 | register HIST_ENTRY *entry; | |
498 | char *arg; | |
1b17e766 EZ |
499 | int i, pos; |
500 | ||
501 | pos = where_history (); | |
d60d9f65 SS |
502 | |
503 | if (history_skip) | |
504 | { | |
505 | for (i = 0; i < history_skip; i++) | |
506 | entry = previous_history (); | |
507 | } | |
508 | ||
509 | entry = previous_history (); | |
1b17e766 EZ |
510 | |
511 | history_set_pos (pos); | |
512 | ||
513 | if (entry == 0) | |
d60d9f65 SS |
514 | { |
515 | ding (); | |
516 | return -1; | |
517 | } | |
518 | ||
519 | arg = history_arg_extract (count, count, entry->line); | |
520 | if (!arg || !*arg) | |
521 | { | |
522 | ding (); | |
523 | return -1; | |
524 | } | |
525 | ||
526 | rl_begin_undo_group (); | |
527 | ||
528 | #if defined (VI_MODE) | |
529 | /* Vi mode always inserts a space before yanking the argument, and it | |
530 | inserts it right *after* rl_point. */ | |
531 | if (rl_editing_mode == vi_mode) | |
532 | { | |
533 | rl_vi_append_mode (1, ignore); | |
534 | rl_insert_text (" "); | |
535 | } | |
536 | #endif /* VI_MODE */ | |
537 | ||
538 | rl_insert_text (arg); | |
539 | free (arg); | |
540 | ||
541 | rl_end_undo_group (); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | /* Yank the COUNTth argument from the previous history line. */ | |
546 | int | |
547 | rl_yank_nth_arg (count, ignore) | |
548 | int count, ignore; | |
549 | { | |
550 | return (rl_yank_nth_arg_internal (count, ignore, 0)); | |
551 | } | |
552 | ||
553 | /* Yank the last argument from the previous history line. This `knows' | |
554 | how rl_yank_nth_arg treats a count of `$'. With an argument, this | |
555 | behaves the same as rl_yank_nth_arg. */ | |
556 | int | |
557 | rl_yank_last_arg (count, key) | |
558 | int count, key; | |
559 | { | |
560 | static int history_skip = 0; | |
561 | static int explicit_arg_p = 0; | |
562 | static int count_passed = 1; | |
563 | static int direction = 1; | |
c862e87b JM |
564 | static int undo_needed = 0; |
565 | int retval; | |
d60d9f65 SS |
566 | |
567 | if (rl_last_func != rl_yank_last_arg) | |
568 | { | |
569 | history_skip = 0; | |
570 | explicit_arg_p = rl_explicit_arg; | |
571 | count_passed = count; | |
572 | direction = 1; | |
573 | } | |
574 | else | |
575 | { | |
c862e87b JM |
576 | if (undo_needed) |
577 | rl_do_undo (); | |
d60d9f65 SS |
578 | if (count < 1) |
579 | direction = -direction; | |
580 | history_skip += direction; | |
581 | if (history_skip < 0) | |
582 | history_skip = 0; | |
d60d9f65 SS |
583 | } |
584 | ||
585 | if (explicit_arg_p) | |
c862e87b | 586 | retval = rl_yank_nth_arg_internal (count_passed, key, history_skip); |
d60d9f65 | 587 | else |
c862e87b JM |
588 | retval = rl_yank_nth_arg_internal ('$', key, history_skip); |
589 | ||
590 | undo_needed = retval == 0; | |
591 | return retval; | |
d60d9f65 SS |
592 | } |
593 | ||
594 | /* A special paste command for users of Cygnus's cygwin32. */ | |
595 | #if defined (__CYGWIN32__) | |
596 | #include <windows.h> | |
597 | ||
598 | int | |
599 | rl_paste_from_clipboard (count, key) | |
600 | int count, key; | |
601 | { | |
602 | char *data, *ptr; | |
603 | int len; | |
604 | ||
605 | if (OpenClipboard (NULL) == 0) | |
606 | return (0); | |
607 | ||
608 | data = (char *)GetClipboardData (CF_TEXT); | |
609 | if (data) | |
610 | { | |
611 | ptr = strchr (data, '\r'); | |
612 | if (ptr) | |
613 | { | |
614 | len = ptr - data; | |
615 | ptr = xmalloc (len + 1); | |
616 | ptr[len] = '\0'; | |
617 | strncpy (ptr, data, len); | |
618 | } | |
619 | else | |
620 | ptr = data; | |
621 | rl_insert_text (ptr); | |
622 | if (ptr != data) | |
623 | free (ptr); | |
624 | CloseClipboard (); | |
625 | } | |
626 | return (0); | |
627 | } | |
628 | #endif /* __CYGWIN32__ */ |