lib/readline/kill.c

   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
  10    as published by the Free Software Foundation; either version 1, or
  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,
  21    675 Mass Ave, Cambridge, MA 02139, USA. */
  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
  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;
  53
  54 extern void _rl_init_argument ();
  55 extern int _rl_set_mark_at_pos ();
  56 extern void _rl_fix_point ();
  57 extern void _rl_abort_internal ();
  58
  59 extern char *xmalloc (), *xrealloc ();
  60
  61 /* **************************************************************** */
  62 /*                                                                  */
  63 /*                      Killing Mechanism                           */
  64 /*                                                                  */
  65 /* **************************************************************** */
  66
  67 /* What we assume for a max number of kills. */
  68 #define DEFAULT_MAX_KILLS 10
  69
  70 /* The real variable to look at to find out when to flush kills. */
  71 static int rl_max_kills =  DEFAULT_MAX_KILLS;
  72
  73 /* Where to store killed text. */
  74 static char **rl_kill_ring = (char **)NULL;
  75
  76 /* Where we are in the kill ring. */
  77 static int rl_kill_index;
  78
  79 /* How many slots we have in the kill ring. */
  80 static int rl_kill_ring_length;
  81
  82 /* How to say that you only want to save a certain amount
  83    of kill material. */
  84 int
  85 rl_set_retained_kills (num)
  86      int num;
  87 {
  88   return 0;
  89 }
  90
  91 /* Add TEXT to the kill ring, allocating a new kill ring slot as necessary.
  92    This uses TEXT directly, so the caller must not free it.  If APPEND is
  93    non-zero, and the last command was a kill, the text is appended to the
  94    current kill ring slot, otherwise prepended. */
  95 static int
  96 _rl_copy_to_kill_ring (text, append)
  97      char *text;
  98      int append;
  99 {
 100   char *old, *new;
 101   int slot;
 102
 103   /* First, find the slot to work with. */
 104   if (_rl_last_command_was_kill == 0)
 105     {
 106       /* Get a new slot.  */
 107       if (rl_kill_ring == 0)
 108         {
 109           /* If we don't have any defined, then make one. */
 110           rl_kill_ring = (char **)
 111             xmalloc (((rl_kill_ring_length = 1) + 1) * sizeof (char *));
 112           rl_kill_ring[slot = 0] = (char *)NULL;
 113         }
 114       else
 115         {
 116           /* We have to add a new slot on the end, unless we have
 117              exceeded the max limit for remembering kills. */
 118           slot = rl_kill_ring_length;
 119           if (slot == rl_max_kills)
 120             {
 121               register int i;
 122               free (rl_kill_ring[0]);
 123               for (i = 0; i < slot; i++)
 124                 rl_kill_ring[i] = rl_kill_ring[i + 1];
 125             }
 126           else
 127             {
 128               slot = rl_kill_ring_length += 1;
 129               rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *));
 130             }
 131           rl_kill_ring[--slot] = (char *)NULL;
 132         }
 133     }
 134   else
 135     slot = rl_kill_ring_length - 1;
 136
 137   /* If the last command was a kill, prepend or append. */
 138   if (_rl_last_command_was_kill && rl_editing_mode != vi_mode)
 139     {
 140       old = rl_kill_ring[slot];
 141       new = xmalloc (1 + strlen (old) + strlen (text));
 142
 143       if (append)
 144         {
 145           strcpy (new, old);
 146           strcat (new, text);
 147         }
 148       else
 149         {
 150           strcpy (new, text);
 151           strcat (new, old);
 152         }
 153       free (old);
 154       free (text);
 155       rl_kill_ring[slot] = new;
 156     }
 157   else
 158     rl_kill_ring[slot] = text;
 159
 160   rl_kill_index = slot;
 161   return 0;
 162 }
 163
 164 /* The way to kill something.  This appends or prepends to the last
 165    kill, if the last command was a kill command.  if FROM is less
 166    than TO, then the text is appended, otherwise prepended.  If the
 167    last command was not a kill command, then a new slot is made for
 168    this kill. */
 169 int
 170 rl_kill_text (from, to)
 171      int from, to;
 172 {
 173   char *text;
 174
 175   /* Is there anything to kill? */
 176   if (from == to)
 177     {
 178       _rl_last_command_was_kill++;
 179       return 0;
 180     }
 181
 182   text = rl_copy_text (from, to);
 183
 184   /* Delete the copied text from the line. */
 185   rl_delete_text (from, to);
 186
 187   _rl_copy_to_kill_ring (text, from < to);
 188
 189   _rl_last_command_was_kill++;
 190   return 0;
 191 }
 192
 193 /* Now REMEMBER!  In order to do prepending or appending correctly, kill
 194    commands always make rl_point's original position be the FROM argument,
 195    and rl_point's extent be the TO argument. */
 196
 197 /* **************************************************************** */
 198 /*                                                                  */
 199 /*                      Killing Commands                            */
 200 /*                                                                  */
 201 /* **************************************************************** */
 202
 203 /* Delete the word at point, saving the text in the kill ring. */
 204 int
 205 rl_kill_word (count, key)
 206      int count, key;
 207 {
 208   int orig_point = rl_point;
 209
 210   if (count < 0)
 211     return (rl_backward_kill_word (-count, key));
 212   else
 213     {
 214       rl_forward_word (count, key);
 215
 216       if (rl_point != orig_point)
 217         rl_kill_text (orig_point, rl_point);
 218
 219       rl_point = orig_point;
 220     }
 221   return 0;
 222 }
 223
 224 /* Rubout the word before point, placing it on the kill ring. */
 225 int
 226 rl_backward_kill_word (count, ignore)
 227      int count, ignore;
 228 {
 229   int orig_point = rl_point;
 230
 231   if (count < 0)
 232     return (rl_kill_word (-count, ignore));
 233   else
 234     {
 235       rl_backward_word (count, ignore);
 236
 237       if (rl_point != orig_point)
 238         rl_kill_text (orig_point, rl_point);
 239     }
 240   return 0;
 241 }
 242
 243 /* Kill from here to the end of the line.  If DIRECTION is negative, kill
 244    back to the line start instead. */
 245 int
 246 rl_kill_line (direction, ignore)
 247      int direction, ignore;
 248 {
 249   int orig_point = rl_point;
 250
 251   if (direction < 0)
 252     return (rl_backward_kill_line (1, ignore));
 253   else
 254     {
 255       rl_end_of_line (1, ignore);
 256       if (orig_point != rl_point)
 257         rl_kill_text (orig_point, rl_point);
 258       rl_point = orig_point;
 259     }
 260   return 0;
 261 }
 262
 263 /* Kill backwards to the start of the line.  If DIRECTION is negative, kill
 264    forwards to the line end instead. */
 265 int
 266 rl_backward_kill_line (direction, ignore)
 267      int direction, ignore;
 268 {
 269   int orig_point = rl_point;
 270
 271   if (direction < 0)
 272     return (rl_kill_line (1, ignore));
 273   else
 274     {
 275       if (!rl_point)
 276         ding ();
 277       else
 278         {
 279           rl_beg_of_line (1, ignore);
 280           rl_kill_text (orig_point, rl_point);
 281         }
 282     }
 283   return 0;
 284 }
 285
 286 /* Kill the whole line, no matter where point is. */
 287 int
 288 rl_kill_full_line (count, ignore)
 289      int count, ignore;
 290 {
 291   rl_begin_undo_group ();
 292   rl_point = 0;
 293   rl_kill_text (rl_point, rl_end);
 294   rl_end_undo_group ();
 295   return 0;
 296 }
 297
 298 /* The next two functions mimic unix line editing behaviour, except they
 299    save the deleted text on the kill ring.  This is safer than not saving
 300    it, and since we have a ring, nobody should get screwed. */
 301
 302 /* This does what C-w does in Unix.  We can't prevent people from
 303    using behaviour that they expect. */
 304 int
 305 rl_unix_word_rubout (count, key)
 306      int count, key;
 307 {
 308   int orig_point;
 309
 310   if (rl_point == 0)
 311     ding ();
 312   else
 313     {
 314       orig_point = rl_point;
 315       if (count <= 0)
 316         count = 1;
 317
 318       while (count--)
 319         {
 320           while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
 321             rl_point--;
 322
 323           while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
 324             rl_point--;
 325         }
 326
 327       rl_kill_text (orig_point, rl_point);
 328     }
 329   return 0;
 330 }
 331
 332 /* Here is C-u doing what Unix does.  You don't *have* to use these
 333    key-bindings.  We have a choice of killing the entire line, or
 334    killing from where we are to the start of the line.  We choose the
 335    latter, because if you are a Unix weenie, then you haven't backspaced
 336    into the line at all, and if you aren't, then you know what you are
 337    doing. */
 338 int
 339 rl_unix_line_discard (count, key)
 340      int count, key;
 341 {
 342   if (rl_point == 0)
 343     ding ();
 344   else
 345     {
 346       rl_kill_text (rl_point, 0);
 347       rl_point = 0;
 348     }
 349   return 0;
 350 }
 351
 352 /* Copy the text in the `region' to the kill ring.  If DELETE is non-zero,
 353    delete the text from the line as well. */
 354 static int
 355 region_kill_internal (delete)
 356      int delete;
 357 {
 358   char *text;
 359
 360   if (rl_mark == rl_point)
 361     {
 362       _rl_last_command_was_kill++;
 363       return 0;
 364     }
 365
 366   text = rl_copy_text (rl_point, rl_mark);
 367   if (delete)
 368     rl_delete_text (rl_point, rl_mark);
 369   _rl_copy_to_kill_ring (text, rl_point < rl_mark);
 370
 371   _rl_last_command_was_kill++;
 372   return 0;
 373 }
 374
 375 /* Copy the text in the region to the kill ring. */
 376 int
 377 rl_copy_region_to_kill (count, ignore)
 378      int count, ignore;
 379 {
 380   return (region_kill_internal (0));
 381 }
 382
 383 /* Kill the text between the point and mark. */
 384 int
 385 rl_kill_region (count, ignore)
 386      int count, ignore;
 387 {
 388   int r;
 389
 390   r = region_kill_internal (1);
 391   _rl_fix_point (1);
 392   return r;
 393 }
 394
 395 /* Copy COUNT words to the kill ring.  DIR says which direction we look
 396    to find the words. */
 397 static int
 398 _rl_copy_word_as_kill (count, dir)
 399      int count, dir;
 400 {
 401   int om, op, r;
 402
 403   om = rl_mark;
 404   op = rl_point;
 405
 406   if (dir > 0)
 407     rl_forward_word (count, 0);
 408   else
 409     rl_backward_word (count, 0);
 410
 411   rl_mark = rl_point;
 412
 413   if (dir > 0)
 414     rl_backward_word (count, 0);
 415   else
 416     rl_forward_word (count, 0);
 417
 418   r = region_kill_internal (0);
 419
 420   rl_mark = om;
 421   rl_point = op;
 422
 423   return r;
 424 }
 425
 426 int
 427 rl_copy_forward_word (count, key)
 428      int count, key;
 429 {
 430   if (count < 0)
 431     return (rl_copy_backward_word (-count, key));
 432
 433   return (_rl_copy_word_as_kill (count, 1));
 434 }
 435
 436 int
 437 rl_copy_backward_word (count, key)
 438      int count, key;
 439 {
 440   if (count < 0)
 441     return (rl_copy_forward_word (-count, key));
 442
 443   return (_rl_copy_word_as_kill (count, -1));
 444 }
 445
 446 /* Yank back the last killed text.  This ignores arguments. */
 447 int
 448 rl_yank (count, ignore)
 449      int count, ignore;
 450 {
 451   if (rl_kill_ring == 0)
 452     {
 453       _rl_abort_internal ();
 454       return -1;
 455     }
 456
 457   _rl_set_mark_at_pos (rl_point);
 458   rl_insert_text (rl_kill_ring[rl_kill_index]);
 459   return 0;
 460 }
 461
 462 /* If the last command was yank, or yank_pop, and the text just
 463    before point is identical to the current kill item, then
 464    delete that text from the line, rotate the index down, and
 465    yank back some other text. */
 466 int
 467 rl_yank_pop (count, key)
 468      int count, key;
 469 {
 470   int l, n;
 471
 472   if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
 473       !rl_kill_ring)
 474     {
 475       _rl_abort_internal ();
 476       return -1;
 477     }
 478
 479   l = strlen (rl_kill_ring[rl_kill_index]);
 480   n = rl_point - l;
 481   if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
 482     {
 483       rl_delete_text (n, rl_point);
 484       rl_point = n;
 485       rl_kill_index--;
 486       if (rl_kill_index < 0)
 487         rl_kill_index = rl_kill_ring_length - 1;
 488       rl_yank (1, 0);
 489       return 0;
 490     }
 491   else
 492     {
 493       _rl_abort_internal ();
 494       return -1;
 495     }
 496 }
 497
 498 /* Yank the COUNTh argument from the previous history line, skipping
 499    HISTORY_SKIP lines before looking for the `previous line'. */
 500 static int
 501 rl_yank_nth_arg_internal (count, ignore, history_skip)
 502      int count, ignore, history_skip;
 503 {
 504   register HIST_ENTRY *entry;
 505   char *arg;
 506   int i;
 507
 508   if (history_skip)
 509     {
 510       for (i = 0; i < history_skip; i++)
 511         entry = previous_history ();
 512     }
 513
 514   entry = previous_history ();
 515   if (entry)
 516     {
 517       if (history_skip)
 518         {
 519           for (i = 0; i < history_skip; i++)
 520             next_history ();
 521         }
 522       next_history ();
 523     }
 524   else
 525     {
 526       ding ();
 527       return -1;
 528     }
 529
 530   arg = history_arg_extract (count, count, entry->line);
 531   if (!arg || !*arg)
 532     {
 533       ding ();
 534       return -1;
 535     }
 536
 537   rl_begin_undo_group ();
 538
 539 #if defined (VI_MODE)
 540   /* Vi mode always inserts a space before yanking the argument, and it
 541      inserts it right *after* rl_point. */
 542   if (rl_editing_mode == vi_mode)
 543     {
 544       rl_vi_append_mode (1, ignore);
 545       rl_insert_text (" ");
 546     }
 547 #endif /* VI_MODE */
 548
 549   rl_insert_text (arg);
 550   free (arg);
 551
 552   rl_end_undo_group ();
 553   return 0;
 554 }
 555
 556 /* Yank the COUNTth argument from the previous history line. */
 557 int
 558 rl_yank_nth_arg (count, ignore)
 559      int count, ignore;
 560 {
 561   return (rl_yank_nth_arg_internal (count, ignore, 0));
 562 }
 563
 564 /* Yank the last argument from the previous history line.  This `knows'
 565    how rl_yank_nth_arg treats a count of `$'.  With an argument, this
 566    behaves the same as rl_yank_nth_arg. */
 567 int
 568 rl_yank_last_arg (count, key)
 569      int count, key;
 570 {
 571   static int history_skip = 0;
 572   static int explicit_arg_p = 0;
 573   static int count_passed = 1;
 574   static int direction = 1;
 575   static int undo_needed = 0;
 576   int retval;
 577
 578   if (rl_last_func != rl_yank_last_arg)
 579     {
 580       history_skip = 0;
 581       explicit_arg_p = rl_explicit_arg;
 582       count_passed = count;
 583       direction = 1;
 584     }
 585   else
 586     {
 587       if (undo_needed)
 588         rl_do_undo ();
 589       if (count < 1)
 590         direction = -direction;
 591       history_skip += direction;
 592       if (history_skip < 0)
 593         history_skip = 0;
 594     }
 595
 596   if (explicit_arg_p)
 597     retval = rl_yank_nth_arg_internal (count_passed, key, history_skip);
 598   else
 599     retval = rl_yank_nth_arg_internal ('$', key, history_skip);
 600
 601   undo_needed = retval == 0;
 602   return retval;
 603 }
 604
 605 /* A special paste command for users of Cygnus's cygwin32. */
 606 #if defined (__CYGWIN32__)
 607 #include <windows.h>
 608
 609 int
 610 rl_paste_from_clipboard (count, key)
 611      int count, key;
 612 {
 613   char *data, *ptr;
 614   int len;
 615
 616   if (OpenClipboard (NULL) == 0)
 617     return (0);
 618
 619   data = (char *)GetClipboardData (CF_TEXT);
 620   if (data)
 621     {
 622       ptr = strchr (data, '\r');
 623       if (ptr)
 624         {
 625           len = ptr - data;
 626           ptr = xmalloc (len + 1);
 627           ptr[len] = '\0';
 628           strncpy (ptr, data, len);
 629         }
 630       else
 631         ptr = data;
 632       rl_insert_text (ptr);
 633       if (ptr != data)
 634         free (ptr);
 635       CloseClipboard ();
 636     }
 637   return (0);
 638 }
 639 #endif /* __CYGWIN32__ */