1 /* kill.c -- kill ring management. */
3 /* Copyright (C) 1994 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library (Readline), a library
6 for reading lines of text with interactive input and history editing.
8 Readline is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Readline is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Readline. If not, see <http://www.gnu.org/licenses/>.
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 #include "rlprivate.h"
52 /* **************************************************************** */
54 /* Killing Mechanism */
56 /* **************************************************************** */
58 /* What we assume for a max number of kills. */
59 #define DEFAULT_MAX_KILLS 10
61 /* The real variable to look at to find out when to flush kills. */
62 static int rl_max_kills = DEFAULT_MAX_KILLS;
64 /* Where to store killed text. */
65 static char **rl_kill_ring = (char **)NULL;
67 /* Where we are in the kill ring. */
68 static int rl_kill_index;
70 /* How many slots we have in the kill ring. */
71 static int rl_kill_ring_length;
73 static int _rl_copy_to_kill_ring PARAMS((char *, int));
74 static int region_kill_internal PARAMS((int));
75 static int _rl_copy_word_as_kill PARAMS((int, int));
76 static int rl_yank_nth_arg_internal PARAMS((int, int, int));
78 /* How to say that you only want to save a certain amount
81 rl_set_retained_kills (num)
87 /* Add TEXT to the kill ring, allocating a new kill ring slot as necessary.
88 This uses TEXT directly, so the caller must not free it. If APPEND is
89 non-zero, and the last command was a kill, the text is appended to the
90 current kill ring slot, otherwise prepended. */
92 _rl_copy_to_kill_ring (text, append)
99 /* First, find the slot to work with. */
100 if (_rl_last_command_was_kill == 0)
102 /* Get a new slot. */
103 if (rl_kill_ring == 0)
105 /* If we don't have any defined, then make one. */
106 rl_kill_ring = (char **)
107 xmalloc (((rl_kill_ring_length = 1) + 1) * sizeof (char *));
108 rl_kill_ring[slot = 0] = (char *)NULL;
112 /* We have to add a new slot on the end, unless we have
113 exceeded the max limit for remembering kills. */
114 slot = rl_kill_ring_length;
115 if (slot == rl_max_kills)
118 xfree (rl_kill_ring[0]);
119 for (i = 0; i < slot; i++)
120 rl_kill_ring[i] = rl_kill_ring[i + 1];
124 slot = rl_kill_ring_length += 1;
125 rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *));
127 rl_kill_ring[--slot] = (char *)NULL;
131 slot = rl_kill_ring_length - 1;
133 /* If the last command was a kill, prepend or append. */
134 if (_rl_last_command_was_kill && rl_editing_mode != vi_mode)
136 old = rl_kill_ring[slot];
137 new = (char *)xmalloc (1 + strlen (old) + strlen (text));
151 rl_kill_ring[slot] = new;
154 rl_kill_ring[slot] = text;
156 rl_kill_index = slot;
160 /* The way to kill something. This appends or prepends to the last
161 kill, if the last command was a kill command. if FROM is less
162 than TO, then the text is appended, otherwise prepended. If the
163 last command was not a kill command, then a new slot is made for
166 rl_kill_text (from, to)
171 /* Is there anything to kill? */
174 _rl_last_command_was_kill++;
178 text = rl_copy_text (from, to);
180 /* Delete the copied text from the line. */
181 rl_delete_text (from, to);
183 _rl_copy_to_kill_ring (text, from < to);
185 _rl_last_command_was_kill++;
189 /* Now REMEMBER! In order to do prepending or appending correctly, kill
190 commands always make rl_point's original position be the FROM argument,
191 and rl_point's extent be the TO argument. */
193 /* **************************************************************** */
195 /* Killing Commands */
197 /* **************************************************************** */
199 /* Delete the word at point, saving the text in the kill ring. */
201 rl_kill_word (count, key)
207 return (rl_backward_kill_word (-count, key));
210 orig_point = rl_point;
211 rl_forward_word (count, key);
213 if (rl_point != orig_point)
214 rl_kill_text (orig_point, rl_point);
216 rl_point = orig_point;
217 if (rl_editing_mode == emacs_mode)
223 /* Rubout the word before point, placing it on the kill ring. */
225 rl_backward_kill_word (count, ignore)
231 return (rl_kill_word (-count, ignore));
234 orig_point = rl_point;
235 rl_backward_word (count, ignore);
237 if (rl_point != orig_point)
238 rl_kill_text (orig_point, rl_point);
240 if (rl_editing_mode == emacs_mode)
246 /* Kill from here to the end of the line. If DIRECTION is negative, kill
247 back to the line start instead. */
249 rl_kill_line (direction, ignore)
250 int direction, ignore;
255 return (rl_backward_kill_line (1, ignore));
258 orig_point = rl_point;
259 rl_end_of_line (1, ignore);
260 if (orig_point != rl_point)
261 rl_kill_text (orig_point, rl_point);
262 rl_point = orig_point;
263 if (rl_editing_mode == emacs_mode)
269 /* Kill backwards to the start of the line. If DIRECTION is negative, kill
270 forwards to the line end instead. */
272 rl_backward_kill_line (direction, ignore)
273 int direction, ignore;
278 return (rl_kill_line (1, ignore));
285 orig_point = rl_point;
286 rl_beg_of_line (1, ignore);
287 if (rl_point != orig_point)
288 rl_kill_text (orig_point, rl_point);
289 if (rl_editing_mode == emacs_mode)
296 /* Kill the whole line, no matter where point is. */
298 rl_kill_full_line (count, ignore)
301 rl_begin_undo_group ();
303 rl_kill_text (rl_point, rl_end);
305 rl_end_undo_group ();
309 /* The next two functions mimic unix line editing behaviour, except they
310 save the deleted text on the kill ring. This is safer than not saving
311 it, and since we have a ring, nobody should get screwed. */
313 /* This does what C-w does in Unix. We can't prevent people from
314 using behaviour that they expect. */
316 rl_unix_word_rubout (count, key)
325 orig_point = rl_point;
331 while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
334 while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
338 rl_kill_text (orig_point, rl_point);
339 if (rl_editing_mode == emacs_mode)
346 /* This deletes one filename component in a Unix pathname. That is, it
347 deletes backward to directory separator (`/') or whitespace. */
349 rl_unix_filename_rubout (count, key)
358 orig_point = rl_point;
364 c = rl_line_buffer[rl_point - 1];
365 while (rl_point && (whitespace (c) || c == '/'))
368 c = rl_line_buffer[rl_point - 1];
371 while (rl_point && (whitespace (c) == 0) && c != '/')
374 c = rl_line_buffer[rl_point - 1];
378 rl_kill_text (orig_point, rl_point);
379 if (rl_editing_mode == emacs_mode)
386 /* Here is C-u doing what Unix does. You don't *have* to use these
387 key-bindings. We have a choice of killing the entire line, or
388 killing from where we are to the start of the line. We choose the
389 latter, because if you are a Unix weenie, then you haven't backspaced
390 into the line at all, and if you aren't, then you know what you are
393 rl_unix_line_discard (count, key)
400 rl_kill_text (rl_point, 0);
402 if (rl_editing_mode == emacs_mode)
408 /* Copy the text in the `region' to the kill ring. If DELETE is non-zero,
409 delete the text from the line as well. */
411 region_kill_internal (delete)
416 if (rl_mark != rl_point)
418 text = rl_copy_text (rl_point, rl_mark);
420 rl_delete_text (rl_point, rl_mark);
421 _rl_copy_to_kill_ring (text, rl_point < rl_mark);
424 _rl_last_command_was_kill++;
428 /* Copy the text in the region to the kill ring. */
430 rl_copy_region_to_kill (count, ignore)
433 return (region_kill_internal (0));
436 /* Kill the text between the point and mark. */
438 rl_kill_region (count, ignore)
443 npoint = (rl_point < rl_mark) ? rl_point : rl_mark;
444 r = region_kill_internal (1);
450 /* Copy COUNT words to the kill ring. DIR says which direction we look
451 to find the words. */
453 _rl_copy_word_as_kill (count, dir)
462 rl_forward_word (count, 0);
464 rl_backward_word (count, 0);
469 rl_backward_word (count, 0);
471 rl_forward_word (count, 0);
473 r = region_kill_internal (0);
482 rl_copy_forward_word (count, key)
486 return (rl_copy_backward_word (-count, key));
488 return (_rl_copy_word_as_kill (count, 1));
492 rl_copy_backward_word (count, key)
496 return (rl_copy_forward_word (-count, key));
498 return (_rl_copy_word_as_kill (count, -1));
501 /* Yank back the last killed text. This ignores arguments. */
503 rl_yank (count, ignore)
506 if (rl_kill_ring == 0)
508 _rl_abort_internal ();
512 _rl_set_mark_at_pos (rl_point);
513 rl_insert_text (rl_kill_ring[rl_kill_index]);
517 /* If the last command was yank, or yank_pop, and the text just
518 before point is identical to the current kill item, then
519 delete that text from the line, rotate the index down, and
520 yank back some other text. */
522 rl_yank_pop (count, key)
527 if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
530 _rl_abort_internal ();
534 l = strlen (rl_kill_ring[rl_kill_index]);
536 if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
538 rl_delete_text (n, rl_point);
541 if (rl_kill_index < 0)
542 rl_kill_index = rl_kill_ring_length - 1;
548 _rl_abort_internal ();
553 /* Yank the COUNTh argument from the previous history line, skipping
554 HISTORY_SKIP lines before looking for the `previous line'. */
556 rl_yank_nth_arg_internal (count, ignore, history_skip)
557 int count, ignore, history_skip;
559 register HIST_ENTRY *entry;
563 pos = where_history ();
567 for (i = 0; i < history_skip; i++)
568 entry = previous_history ();
571 entry = previous_history ();
573 history_set_pos (pos);
581 arg = history_arg_extract (count, count, entry->line);
589 rl_begin_undo_group ();
591 _rl_set_mark_at_pos (rl_point);
593 #if defined (VI_MODE)
594 /* Vi mode always inserts a space before yanking the argument, and it
595 inserts it right *after* rl_point. */
596 if (rl_editing_mode == vi_mode)
598 rl_vi_append_mode (1, ignore);
599 rl_insert_text (" ");
603 rl_insert_text (arg);
606 rl_end_undo_group ();
610 /* Yank the COUNTth argument from the previous history line. */
612 rl_yank_nth_arg (count, ignore)
615 return (rl_yank_nth_arg_internal (count, ignore, 0));
618 /* Yank the last argument from the previous history line. This `knows'
619 how rl_yank_nth_arg treats a count of `$'. With an argument, this
620 behaves the same as rl_yank_nth_arg. */
622 rl_yank_last_arg (count, key)
625 static int history_skip = 0;
626 static int explicit_arg_p = 0;
627 static int count_passed = 1;
628 static int direction = 1;
629 static int undo_needed = 0;
632 if (rl_last_func != rl_yank_last_arg)
635 explicit_arg_p = rl_explicit_arg;
636 count_passed = count;
643 if (count < 0) /* XXX - was < 1 */
644 direction = -direction;
645 history_skip += direction;
646 if (history_skip < 0)
651 retval = rl_yank_nth_arg_internal (count_passed, key, history_skip);
653 retval = rl_yank_nth_arg_internal ('$', key, history_skip);
655 undo_needed = retval == 0;
659 /* A special paste command for users of Cygnus's cygwin32. */
660 #if defined (__CYGWIN__)
664 rl_paste_from_clipboard (count, key)
670 if (OpenClipboard (NULL) == 0)
673 data = (char *)GetClipboardData (CF_TEXT);
676 ptr = strchr (data, '\r');
680 ptr = (char *)xmalloc (len + 1);
682 strncpy (ptr, data, len);
686 _rl_set_mark_at_pos (rl_point);
687 rl_insert_text (ptr);
694 #endif /* __CYGWIN__ */