1 /* kill.c -- kill ring management. */
3 /* Copyright (C) 1994 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library, a library for
6 reading lines of text with interactive input and history editing.
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
10 as published by the Free Software Foundation; either version 1, or
11 (at your option) any later version.
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.
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,
21 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #define READLINE_LIBRARY
24 #if defined (HAVE_CONFIG_H)
28 #include <sys/types.h>
30 #if defined (HAVE_UNISTD_H)
31 # include <unistd.h> /* for _POSIX_VERSION */
32 #endif /* HAVE_UNISTD_H */
34 #if defined (HAVE_STDLIB_H)
37 # include "ansi_stdlib.h"
38 #endif /* HAVE_STDLIB_H */
42 /* System-specific feature definitions and include files. */
45 /* Some standard library routines. */
49 extern int _rl_last_command_was_kill;
50 extern int rl_editing_mode;
51 extern int rl_explicit_arg;
52 extern Function *rl_last_func;
54 extern void _rl_init_argument ();
55 extern int _rl_set_mark_at_pos ();
56 extern void _rl_abort_internal ();
58 extern char *xmalloc (), *xrealloc ();
60 /* **************************************************************** */
62 /* Killing Mechanism */
64 /* **************************************************************** */
66 /* What we assume for a max number of kills. */
67 #define DEFAULT_MAX_KILLS 10
69 /* The real variable to look at to find out when to flush kills. */
70 static int rl_max_kills = DEFAULT_MAX_KILLS;
72 /* Where to store killed text. */
73 static char **rl_kill_ring = (char **)NULL;
75 /* Where we are in the kill ring. */
76 static int rl_kill_index;
78 /* How many slots we have in the kill ring. */
79 static int rl_kill_ring_length;
81 /* How to say that you only want to save a certain amount
84 rl_set_retained_kills (num)
90 /* Add TEXT to the kill ring, allocating a new kill ring slot as necessary.
91 This uses TEXT directly, so the caller must not free it. If APPEND is
92 non-zero, and the last command was a kill, the text is appended to the
93 current kill ring slot, otherwise prepended. */
95 _rl_copy_to_kill_ring (text, append)
102 /* First, find the slot to work with. */
103 if (_rl_last_command_was_kill == 0)
105 /* Get a new slot. */
106 if (rl_kill_ring == 0)
108 /* If we don't have any defined, then make one. */
109 rl_kill_ring = (char **)
110 xmalloc (((rl_kill_ring_length = 1) + 1) * sizeof (char *));
111 rl_kill_ring[slot = 0] = (char *)NULL;
115 /* We have to add a new slot on the end, unless we have
116 exceeded the max limit for remembering kills. */
117 slot = rl_kill_ring_length;
118 if (slot == rl_max_kills)
121 free (rl_kill_ring[0]);
122 for (i = 0; i < slot; i++)
123 rl_kill_ring[i] = rl_kill_ring[i + 1];
127 slot = rl_kill_ring_length += 1;
128 rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *));
130 rl_kill_ring[--slot] = (char *)NULL;
134 slot = rl_kill_ring_length - 1;
136 /* If the last command was a kill, prepend or append. */
137 if (_rl_last_command_was_kill && rl_editing_mode != vi_mode)
139 old = rl_kill_ring[slot];
140 new = xmalloc (1 + strlen (old) + strlen (text));
154 rl_kill_ring[slot] = new;
157 rl_kill_ring[slot] = text;
159 rl_kill_index = slot;
163 /* The way to kill something. This appends or prepends to the last
164 kill, if the last command was a kill command. if FROM is less
165 than TO, then the text is appended, otherwise prepended. If the
166 last command was not a kill command, then a new slot is made for
169 rl_kill_text (from, to)
174 /* Is there anything to kill? */
177 _rl_last_command_was_kill++;
181 text = rl_copy_text (from, to);
183 /* Delete the copied text from the line. */
184 rl_delete_text (from, to);
186 _rl_copy_to_kill_ring (text, from < to);
188 _rl_last_command_was_kill++;
192 /* Now REMEMBER! In order to do prepending or appending correctly, kill
193 commands always make rl_point's original position be the FROM argument,
194 and rl_point's extent be the TO argument. */
196 /* **************************************************************** */
198 /* Killing Commands */
200 /* **************************************************************** */
202 /* Delete the word at point, saving the text in the kill ring. */
204 rl_kill_word (count, key)
207 int orig_point = rl_point;
210 return (rl_backward_kill_word (-count, key));
213 rl_forward_word (count, key);
215 if (rl_point != orig_point)
216 rl_kill_text (orig_point, rl_point);
218 rl_point = orig_point;
223 /* Rubout the word before point, placing it on the kill ring. */
225 rl_backward_kill_word (count, ignore)
228 int orig_point = rl_point;
231 return (rl_kill_word (-count, ignore));
234 rl_backward_word (count, ignore);
236 if (rl_point != orig_point)
237 rl_kill_text (orig_point, rl_point);
242 /* Kill from here to the end of the line. If DIRECTION is negative, kill
243 back to the line start instead. */
245 rl_kill_line (direction, ignore)
246 int direction, ignore;
248 int orig_point = rl_point;
251 return (rl_backward_kill_line (1, ignore));
254 rl_end_of_line (1, ignore);
255 if (orig_point != rl_point)
256 rl_kill_text (orig_point, rl_point);
257 rl_point = orig_point;
262 /* Kill backwards to the start of the line. If DIRECTION is negative, kill
263 forwards to the line end instead. */
265 rl_backward_kill_line (direction, ignore)
266 int direction, ignore;
268 int orig_point = rl_point;
271 return (rl_kill_line (1, ignore));
278 rl_beg_of_line (1, ignore);
279 rl_kill_text (orig_point, rl_point);
285 /* Kill the whole line, no matter where point is. */
287 rl_kill_full_line (count, ignore)
290 rl_begin_undo_group ();
292 rl_kill_text (rl_point, rl_end);
293 rl_end_undo_group ();
297 /* The next two functions mimic unix line editing behaviour, except they
298 save the deleted text on the kill ring. This is safer than not saving
299 it, and since we have a ring, nobody should get screwed. */
301 /* This does what C-w does in Unix. We can't prevent people from
302 using behaviour that they expect. */
304 rl_unix_word_rubout (count, key)
313 orig_point = rl_point;
319 while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
322 while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
326 rl_kill_text (orig_point, rl_point);
331 /* Here is C-u doing what Unix does. You don't *have* to use these
332 key-bindings. We have a choice of killing the entire line, or
333 killing from where we are to the start of the line. We choose the
334 latter, because if you are a Unix weenie, then you haven't backspaced
335 into the line at all, and if you aren't, then you know what you are
338 rl_unix_line_discard (count, key)
345 rl_kill_text (rl_point, 0);
351 /* Copy the text in the `region' to the kill ring. If DELETE is non-zero,
352 delete the text from the line as well. */
354 region_kill_internal (delete)
359 if (rl_mark == rl_point)
361 _rl_last_command_was_kill++;
365 text = rl_copy_text (rl_point, rl_mark);
367 rl_delete_text (rl_point, rl_mark);
368 _rl_copy_to_kill_ring (text, rl_point < rl_mark);
370 _rl_last_command_was_kill++;
374 /* Copy the text in the region to the kill ring. */
376 rl_copy_region_to_kill (count, ignore)
379 return (region_kill_internal (0));
382 /* Kill the text between the point and mark. */
384 rl_kill_region (count, ignore)
387 return (region_kill_internal (1));
390 /* Copy COUNT words to the kill ring. DIR says which direction we look
391 to find the words. */
393 _rl_copy_word_as_kill (count, dir)
402 rl_forward_word (count, 0);
404 rl_backward_word (count, 0);
409 rl_backward_word (count, 0);
411 rl_forward_word (count, 0);
413 r = region_kill_internal (0);
422 rl_copy_forward_word (count, key)
426 return (rl_copy_backward_word (-count, key));
428 return (_rl_copy_word_as_kill (count, 1));
432 rl_copy_backward_word (count, key)
436 return (rl_copy_forward_word (-count, key));
438 return (_rl_copy_word_as_kill (count, -1));
441 /* Yank back the last killed text. This ignores arguments. */
443 rl_yank (count, ignore)
446 if (rl_kill_ring == 0)
448 _rl_abort_internal ();
452 _rl_set_mark_at_pos (rl_point);
453 rl_insert_text (rl_kill_ring[rl_kill_index]);
457 /* If the last command was yank, or yank_pop, and the text just
458 before point is identical to the current kill item, then
459 delete that text from the line, rotate the index down, and
460 yank back some other text. */
462 rl_yank_pop (count, key)
467 if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
470 _rl_abort_internal ();
474 l = strlen (rl_kill_ring[rl_kill_index]);
476 if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
478 rl_delete_text (n, rl_point);
481 if (rl_kill_index < 0)
482 rl_kill_index = rl_kill_ring_length - 1;
488 _rl_abort_internal ();
493 /* Yank the COUNTth argument from the previous history line. */
495 rl_yank_nth_arg (count, ignore)
498 register HIST_ENTRY *entry;
501 entry = previous_history ();
510 arg = history_arg_extract (count, count, entry->line);
517 rl_begin_undo_group ();
519 #if defined (VI_MODE)
520 /* Vi mode always inserts a space before yanking the argument, and it
521 inserts it right *after* rl_point. */
522 if (rl_editing_mode == vi_mode)
524 rl_vi_append_mode ();
525 rl_insert_text (" ");
529 rl_insert_text (arg);
532 rl_end_undo_group ();
536 /* Yank the last argument from the previous history line. This `knows'
537 how rl_yank_nth_arg treats a count of `$'. With an argument, this
538 behaves the same as rl_yank_nth_arg. */
540 rl_yank_last_arg (count, key)
544 return (rl_yank_nth_arg (count, key));
546 return (rl_yank_nth_arg ('$', key));