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 2, 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 59 Temple Place, Suite 330, Boston, MA 02111 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 #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 /* How to say that you only want to save a certain amount
76 rl_set_retained_kills (num)
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. */
87 _rl_copy_to_kill_ring (text, append)
94 /* First, find the slot to work with. */
95 if (_rl_last_command_was_kill == 0)
98 if (rl_kill_ring == 0)
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;
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)
113 free (rl_kill_ring[0]);
114 for (i = 0; i < slot; i++)
115 rl_kill_ring[i] = rl_kill_ring[i + 1];
119 slot = rl_kill_ring_length += 1;
120 rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *));
122 rl_kill_ring[--slot] = (char *)NULL;
126 slot = rl_kill_ring_length - 1;
128 /* If the last command was a kill, prepend or append. */
129 if (_rl_last_command_was_kill && rl_editing_mode != vi_mode)
131 old = rl_kill_ring[slot];
132 new = xmalloc (1 + strlen (old) + strlen (text));
146 rl_kill_ring[slot] = new;
149 rl_kill_ring[slot] = text;
151 rl_kill_index = slot;
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
161 rl_kill_text (from, to)
166 /* Is there anything to kill? */
169 _rl_last_command_was_kill++;
173 text = rl_copy_text (from, to);
175 /* Delete the copied text from the line. */
176 rl_delete_text (from, to);
178 _rl_copy_to_kill_ring (text, from < to);
180 _rl_last_command_was_kill++;
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. */
188 /* **************************************************************** */
190 /* Killing Commands */
192 /* **************************************************************** */
194 /* Delete the word at point, saving the text in the kill ring. */
196 rl_kill_word (count, key)
199 int orig_point = rl_point;
202 return (rl_backward_kill_word (-count, key));
205 rl_forward_word (count, key);
207 if (rl_point != orig_point)
208 rl_kill_text (orig_point, rl_point);
210 rl_point = orig_point;
215 /* Rubout the word before point, placing it on the kill ring. */
217 rl_backward_kill_word (count, ignore)
220 int orig_point = rl_point;
223 return (rl_kill_word (-count, ignore));
226 rl_backward_word (count, ignore);
228 if (rl_point != orig_point)
229 rl_kill_text (orig_point, rl_point);
234 /* Kill from here to the end of the line. If DIRECTION is negative, kill
235 back to the line start instead. */
237 rl_kill_line (direction, ignore)
238 int direction, ignore;
240 int orig_point = rl_point;
243 return (rl_backward_kill_line (1, ignore));
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;
254 /* Kill backwards to the start of the line. If DIRECTION is negative, kill
255 forwards to the line end instead. */
257 rl_backward_kill_line (direction, ignore)
258 int direction, ignore;
260 int orig_point = rl_point;
263 return (rl_kill_line (1, ignore));
270 rl_beg_of_line (1, ignore);
271 rl_kill_text (orig_point, rl_point);
277 /* Kill the whole line, no matter where point is. */
279 rl_kill_full_line (count, ignore)
282 rl_begin_undo_group ();
284 rl_kill_text (rl_point, rl_end);
285 rl_end_undo_group ();
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. */
293 /* This does what C-w does in Unix. We can't prevent people from
294 using behaviour that they expect. */
296 rl_unix_word_rubout (count, key)
305 orig_point = rl_point;
311 while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
314 while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
318 rl_kill_text (orig_point, rl_point);
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
330 rl_unix_line_discard (count, key)
337 rl_kill_text (rl_point, 0);
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. */
346 region_kill_internal (delete)
351 if (rl_mark == rl_point)
353 _rl_last_command_was_kill++;
357 text = rl_copy_text (rl_point, rl_mark);
359 rl_delete_text (rl_point, rl_mark);
360 _rl_copy_to_kill_ring (text, rl_point < rl_mark);
362 _rl_last_command_was_kill++;
366 /* Copy the text in the region to the kill ring. */
368 rl_copy_region_to_kill (count, ignore)
371 return (region_kill_internal (0));
374 /* Kill the text between the point and mark. */
376 rl_kill_region (count, ignore)
381 npoint = (rl_point < rl_mark) ? rl_point : rl_mark;
382 r = region_kill_internal (1);
388 /* Copy COUNT words to the kill ring. DIR says which direction we look
389 to find the words. */
391 _rl_copy_word_as_kill (count, dir)
400 rl_forward_word (count, 0);
402 rl_backward_word (count, 0);
407 rl_backward_word (count, 0);
409 rl_forward_word (count, 0);
411 r = region_kill_internal (0);
420 rl_copy_forward_word (count, key)
424 return (rl_copy_backward_word (-count, key));
426 return (_rl_copy_word_as_kill (count, 1));
430 rl_copy_backward_word (count, key)
434 return (rl_copy_forward_word (-count, key));
436 return (_rl_copy_word_as_kill (count, -1));
439 /* Yank back the last killed text. This ignores arguments. */
441 rl_yank (count, ignore)
444 if (rl_kill_ring == 0)
446 _rl_abort_internal ();
450 _rl_set_mark_at_pos (rl_point);
451 rl_insert_text (rl_kill_ring[rl_kill_index]);
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. */
460 rl_yank_pop (count, key)
465 if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
468 _rl_abort_internal ();
472 l = strlen (rl_kill_ring[rl_kill_index]);
474 if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
476 rl_delete_text (n, rl_point);
479 if (rl_kill_index < 0)
480 rl_kill_index = rl_kill_ring_length - 1;
486 _rl_abort_internal ();
491 /* Yank the COUNTh argument from the previous history line, skipping
492 HISTORY_SKIP lines before looking for the `previous line'. */
494 rl_yank_nth_arg_internal (count, ignore, history_skip)
495 int count, ignore, history_skip;
497 register HIST_ENTRY *entry;
501 pos = where_history ();
505 for (i = 0; i < history_skip; i++)
506 entry = previous_history ();
509 entry = previous_history ();
511 history_set_pos (pos);
519 arg = history_arg_extract (count, count, entry->line);
526 rl_begin_undo_group ();
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)
533 rl_vi_append_mode (1, ignore);
534 rl_insert_text (" ");
538 rl_insert_text (arg);
541 rl_end_undo_group ();
545 /* Yank the COUNTth argument from the previous history line. */
547 rl_yank_nth_arg (count, ignore)
550 return (rl_yank_nth_arg_internal (count, ignore, 0));
553 /* Yank the last argument from the previous history line. This `knows'
554 how rl_yank_nth_arg treats a count of `$'. With an argument, this
555 behaves the same as rl_yank_nth_arg. */
557 rl_yank_last_arg (count, key)
560 static int history_skip = 0;
561 static int explicit_arg_p = 0;
562 static int count_passed = 1;
563 static int direction = 1;
564 static int undo_needed = 0;
567 if (rl_last_func != rl_yank_last_arg)
570 explicit_arg_p = rl_explicit_arg;
571 count_passed = count;
579 direction = -direction;
580 history_skip += direction;
581 if (history_skip < 0)
586 retval = rl_yank_nth_arg_internal (count_passed, key, history_skip);
588 retval = rl_yank_nth_arg_internal ('$', key, history_skip);
590 undo_needed = retval == 0;
594 /* A special paste command for users of Cygnus's cygwin32. */
595 #if defined (__CYGWIN32__)
599 rl_paste_from_clipboard (count, key)
605 if (OpenClipboard (NULL) == 0)
608 data = (char *)GetClipboardData (CF_TEXT);
611 ptr = strchr (data, '\r');
615 ptr = xmalloc (len + 1);
617 strncpy (ptr, data, len);
621 rl_insert_text (ptr);
628 #endif /* __CYGWIN32__ */