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 (Readline), a library
   6    for reading lines of text with interactive input and history editing.
   7
   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.
  12
  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.
  17
  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/>.
  20 */
  21
  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 #include "rlprivate.h"
  50 #include "xmalloc.h"
  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 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));
  77
  78 /* How to say that you only want to save a certain amount
  79    of kill material. */
  80 int
  81 rl_set_retained_kills (num)
  82      int num;
  83 {
  84   return 0;
  85 }
  86
  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. */
  91 static int
  92 _rl_copy_to_kill_ring (text, append)
  93      char *text;
  94      int append;
  95 {
  96   char *old, *new;
  97   int slot;
  98
  99   /* First, find the slot to work with. */
 100   if (_rl_last_command_was_kill == 0)
 101     {
 102       /* Get a new slot.  */
 103       if (rl_kill_ring == 0)
 104         {
 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;
 109         }
 110       else
 111         {
 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)
 116             {
 117               register int i;
 118               xfree (rl_kill_ring[0]);
 119               for (i = 0; i < slot; i++)
 120                 rl_kill_ring[i] = rl_kill_ring[i + 1];
 121             }
 122           else
 123             {
 124               slot = rl_kill_ring_length += 1;
 125               rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *));
 126             }
 127           rl_kill_ring[--slot] = (char *)NULL;
 128         }
 129     }
 130   else
 131     slot = rl_kill_ring_length - 1;
 132
 133   /* If the last command was a kill, prepend or append. */
 134   if (_rl_last_command_was_kill && rl_editing_mode != vi_mode)
 135     {
 136       old = rl_kill_ring[slot];
 137       new = (char *)xmalloc (1 + strlen (old) + strlen (text));
 138
 139       if (append)
 140         {
 141           strcpy (new, old);
 142           strcat (new, text);
 143         }
 144       else
 145         {
 146           strcpy (new, text);
 147           strcat (new, old);
 148         }
 149       xfree (old);
 150       xfree (text);
 151       rl_kill_ring[slot] = new;
 152     }
 153   else
 154     rl_kill_ring[slot] = text;
 155
 156   rl_kill_index = slot;
 157   return 0;
 158 }
 159
 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
 164    this kill. */
 165 int
 166 rl_kill_text (from, to)
 167      int from, to;
 168 {
 169   char *text;
 170
 171   /* Is there anything to kill? */
 172   if (from == to)
 173     {
 174       _rl_last_command_was_kill++;
 175       return 0;
 176     }
 177
 178   text = rl_copy_text (from, to);
 179
 180   /* Delete the copied text from the line. */
 181   rl_delete_text (from, to);
 182
 183   _rl_copy_to_kill_ring (text, from < to);
 184
 185   _rl_last_command_was_kill++;
 186   return 0;
 187 }
 188
 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. */
 192
 193 /* **************************************************************** */
 194 /*                                                                  */
 195 /*                      Killing Commands                            */
 196 /*                                                                  */
 197 /* **************************************************************** */
 198
 199 /* Delete the word at point, saving the text in the kill ring. */
 200 int
 201 rl_kill_word (count, key)
 202      int count, key;
 203 {
 204   int orig_point;
 205
 206   if (count < 0)
 207     return (rl_backward_kill_word (-count, key));
 208   else
 209     {
 210       orig_point = rl_point;
 211       rl_forward_word (count, key);
 212
 213       if (rl_point != orig_point)
 214         rl_kill_text (orig_point, rl_point);
 215
 216       rl_point = orig_point;
 217       if (rl_editing_mode == emacs_mode)
 218         rl_mark = rl_point;
 219     }
 220   return 0;
 221 }
 222
 223 /* Rubout the word before point, placing it on the kill ring. */
 224 int
 225 rl_backward_kill_word (count, ignore)
 226      int count, ignore;
 227 {
 228   int orig_point;
 229
 230   if (count < 0)
 231     return (rl_kill_word (-count, ignore));
 232   else
 233     {
 234       orig_point = rl_point;
 235       rl_backward_word (count, ignore);
 236
 237       if (rl_point != orig_point)
 238         rl_kill_text (orig_point, rl_point);
 239
 240       if (rl_editing_mode == emacs_mode)
 241         rl_mark = rl_point;
 242     }
 243   return 0;
 244 }
 245
 246 /* Kill from here to the end of the line.  If DIRECTION is negative, kill
 247    back to the line start instead. */
 248 int
 249 rl_kill_line (direction, ignore)
 250      int direction, ignore;
 251 {
 252   int orig_point;
 253
 254   if (direction < 0)
 255     return (rl_backward_kill_line (1, ignore));
 256   else
 257     {
 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)
 264         rl_mark = rl_point;
 265     }
 266   return 0;
 267 }
 268
 269 /* Kill backwards to the start of the line.  If DIRECTION is negative, kill
 270    forwards to the line end instead. */
 271 int
 272 rl_backward_kill_line (direction, ignore)
 273      int direction, ignore;
 274 {
 275   int orig_point;
 276
 277   if (direction < 0)
 278     return (rl_kill_line (1, ignore));
 279   else
 280     {
 281       if (!rl_point)
 282         rl_ding ();
 283       else
 284         {
 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)
 290             rl_mark = rl_point;
 291         }
 292     }
 293   return 0;
 294 }
 295
 296 /* Kill the whole line, no matter where point is. */
 297 int
 298 rl_kill_full_line (count, ignore)
 299      int count, ignore;
 300 {
 301   rl_begin_undo_group ();
 302   rl_point = 0;
 303   rl_kill_text (rl_point, rl_end);
 304   rl_mark = 0;
 305   rl_end_undo_group ();
 306   return 0;
 307 }
 308
 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. */
 312
 313 /* This does what C-w does in Unix.  We can't prevent people from
 314    using behaviour that they expect. */
 315 int
 316 rl_unix_word_rubout (count, key)
 317      int count, key;
 318 {
 319   int orig_point;
 320
 321   if (rl_point == 0)
 322     rl_ding ();
 323   else
 324     {
 325       orig_point = rl_point;
 326       if (count <= 0)
 327         count = 1;
 328
 329       while (count--)
 330         {
 331           while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
 332             rl_point--;
 333
 334           while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
 335             rl_point--;
 336         }
 337
 338       rl_kill_text (orig_point, rl_point);
 339       if (rl_editing_mode == emacs_mode)
 340         rl_mark = rl_point;
 341     }
 342
 343   return 0;
 344 }
 345
 346 /* This deletes one filename component in a Unix pathname.  That is, it
 347    deletes backward to directory separator (`/') or whitespace.  */
 348 int
 349 rl_unix_filename_rubout (count, key)
 350      int count, key;
 351 {
 352   int orig_point, c;
 353
 354   if (rl_point == 0)
 355     rl_ding ();
 356   else
 357     {
 358       orig_point = rl_point;
 359       if (count <= 0)
 360         count = 1;
 361
 362       while (count--)
 363         {
 364           c = rl_line_buffer[rl_point - 1];
 365           while (rl_point && (whitespace (c) || c == '/'))
 366             {
 367               rl_point--;
 368               c = rl_line_buffer[rl_point - 1];
 369             }
 370
 371           while (rl_point && (whitespace (c) == 0) && c != '/')
 372             {
 373               rl_point--;
 374               c = rl_line_buffer[rl_point - 1];
 375             }
 376         }
 377
 378       rl_kill_text (orig_point, rl_point);
 379       if (rl_editing_mode == emacs_mode)
 380         rl_mark = rl_point;
 381     }
 382
 383   return 0;
 384 }
 385
 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
 391    doing. */
 392 int
 393 rl_unix_line_discard (count, key)
 394      int count, key;
 395 {
 396   if (rl_point == 0)
 397     rl_ding ();
 398   else
 399     {
 400       rl_kill_text (rl_point, 0);
 401       rl_point = 0;
 402       if (rl_editing_mode == emacs_mode)
 403         rl_mark = rl_point;
 404     }
 405   return 0;
 406 }
 407
 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. */
 410 static int
 411 region_kill_internal (delete)
 412      int delete;
 413 {
 414   char *text;
 415
 416   if (rl_mark != rl_point)
 417     {
 418       text = rl_copy_text (rl_point, rl_mark);
 419       if (delete)
 420         rl_delete_text (rl_point, rl_mark);
 421       _rl_copy_to_kill_ring (text, rl_point < rl_mark);
 422     }
 423
 424   _rl_last_command_was_kill++;
 425   return 0;
 426 }
 427
 428 /* Copy the text in the region to the kill ring. */
 429 int
 430 rl_copy_region_to_kill (count, ignore)
 431      int count, ignore;
 432 {
 433   return (region_kill_internal (0));
 434 }
 435
 436 /* Kill the text between the point and mark. */
 437 int
 438 rl_kill_region (count, ignore)
 439      int count, ignore;
 440 {
 441   int r, npoint;
 442
 443   npoint = (rl_point < rl_mark) ? rl_point : rl_mark;
 444   r = region_kill_internal (1);
 445   _rl_fix_point (1);
 446   rl_point = npoint;
 447   return r;
 448 }
 449
 450 /* Copy COUNT words to the kill ring.  DIR says which direction we look
 451    to find the words. */
 452 static int
 453 _rl_copy_word_as_kill (count, dir)
 454      int count, dir;
 455 {
 456   int om, op, r;
 457
 458   om = rl_mark;
 459   op = rl_point;
 460
 461   if (dir > 0)
 462     rl_forward_word (count, 0);
 463   else
 464     rl_backward_word (count, 0);
 465
 466   rl_mark = rl_point;
 467
 468   if (dir > 0)
 469     rl_backward_word (count, 0);
 470   else
 471     rl_forward_word (count, 0);
 472
 473   r = region_kill_internal (0);
 474
 475   rl_mark = om;
 476   rl_point = op;
 477
 478   return r;
 479 }
 480
 481 int
 482 rl_copy_forward_word (count, key)
 483      int count, key;
 484 {
 485   if (count < 0)
 486     return (rl_copy_backward_word (-count, key));
 487
 488   return (_rl_copy_word_as_kill (count, 1));
 489 }
 490
 491 int
 492 rl_copy_backward_word (count, key)
 493      int count, key;
 494 {
 495   if (count < 0)
 496     return (rl_copy_forward_word (-count, key));
 497
 498   return (_rl_copy_word_as_kill (count, -1));
 499 }
 500
 501 /* Yank back the last killed text.  This ignores arguments. */
 502 int
 503 rl_yank (count, ignore)
 504      int count, ignore;
 505 {
 506   if (rl_kill_ring == 0)
 507     {
 508       _rl_abort_internal ();
 509       return -1;
 510     }
 511
 512   _rl_set_mark_at_pos (rl_point);
 513   rl_insert_text (rl_kill_ring[rl_kill_index]);
 514   return 0;
 515 }
 516
 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. */
 521 int
 522 rl_yank_pop (count, key)
 523      int count, key;
 524 {
 525   int l, n;
 526
 527   if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
 528       !rl_kill_ring)
 529     {
 530       _rl_abort_internal ();
 531       return -1;
 532     }
 533
 534   l = strlen (rl_kill_ring[rl_kill_index]);
 535   n = rl_point - l;
 536   if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
 537     {
 538       rl_delete_text (n, rl_point);
 539       rl_point = n;
 540       rl_kill_index--;
 541       if (rl_kill_index < 0)
 542         rl_kill_index = rl_kill_ring_length - 1;
 543       rl_yank (1, 0);
 544       return 0;
 545     }
 546   else
 547     {
 548       _rl_abort_internal ();
 549       return -1;
 550     }
 551 }
 552
 553 /* Yank the COUNTh argument from the previous history line, skipping
 554    HISTORY_SKIP lines before looking for the `previous line'. */
 555 static int
 556 rl_yank_nth_arg_internal (count, ignore, history_skip)
 557      int count, ignore, history_skip;
 558 {
 559   register HIST_ENTRY *entry;
 560   char *arg;
 561   int i, pos;
 562
 563   pos = where_history ();
 564
 565   if (history_skip)
 566     {
 567       for (i = 0; i < history_skip; i++)
 568         entry = previous_history ();
 569     }
 570
 571   entry = previous_history ();
 572
 573   history_set_pos (pos);
 574
 575   if (entry == 0)
 576     {
 577       rl_ding ();
 578       return -1;
 579     }
 580
 581   arg = history_arg_extract (count, count, entry->line);
 582   if (!arg || !*arg)
 583     {
 584       rl_ding ();
 585       FREE (arg);
 586       return -1;
 587     }
 588
 589   rl_begin_undo_group ();
 590
 591   _rl_set_mark_at_pos (rl_point);
 592
 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)
 597     {
 598       rl_vi_append_mode (1, ignore);
 599       rl_insert_text (" ");
 600     }
 601 #endif /* VI_MODE */
 602
 603   rl_insert_text (arg);
 604   xfree (arg);
 605
 606   rl_end_undo_group ();
 607   return 0;
 608 }
 609
 610 /* Yank the COUNTth argument from the previous history line. */
 611 int
 612 rl_yank_nth_arg (count, ignore)
 613      int count, ignore;
 614 {
 615   return (rl_yank_nth_arg_internal (count, ignore, 0));
 616 }
 617
 618 /* Yank the last argument from the previous history line.  This `knows'
 619    how rl_yank_nth_arg treats a count of `$'.  With an argument, this
 620    behaves the same as rl_yank_nth_arg. */
 621 int
 622 rl_yank_last_arg (count, key)
 623      int count, key;
 624 {
 625   static int history_skip = 0;
 626   static int explicit_arg_p = 0;
 627   static int count_passed = 1;
 628   static int direction = 1;
 629   static int undo_needed = 0;
 630   int retval;
 631
 632   if (rl_last_func != rl_yank_last_arg)
 633     {
 634       history_skip = 0;
 635       explicit_arg_p = rl_explicit_arg;
 636       count_passed = count;
 637       direction = 1;
 638     }
 639   else
 640     {
 641       if (undo_needed)
 642         rl_do_undo ();
 643       if (count < 0)            /* XXX - was < 1 */
 644         direction = -direction;
 645       history_skip += direction;
 646       if (history_skip < 0)
 647         history_skip = 0;
 648     }
 649
 650   if (explicit_arg_p)
 651     retval = rl_yank_nth_arg_internal (count_passed, key, history_skip);
 652   else
 653     retval = rl_yank_nth_arg_internal ('$', key, history_skip);
 654
 655   undo_needed = retval == 0;
 656   return retval;
 657 }
 658
 659 /* A special paste command for users of Cygnus's cygwin32. */
 660 #if defined (_WIN32)
 661 #include <windows.h>
 662
 663 int
 664 rl_paste_from_clipboard (count, key)
 665      int count, key;
 666 {
 667   char *data, *ptr;
 668   int len;
 669
 670   if (OpenClipboard (NULL) == 0)
 671     return (0);
 672
 673   data = (char *)GetClipboardData (CF_TEXT);
 674   if (data)
 675     {
 676       ptr = strchr (data, '\r');
 677       if (ptr)
 678         {
 679           len = ptr - data;
 680           ptr = (char *)xmalloc (len + 1);
 681           ptr[len] = '\0';
 682           strncpy (ptr, data, len);
 683         }
 684       else
 685         ptr = data;
 686       _rl_set_mark_at_pos (rl_point);
 687       rl_insert_text (ptr);
 688       if (ptr != data)
 689         xfree (ptr);
 690       CloseClipboard ();
 691     }
 692   return (0);
 693 }
 694 #endif /* __CYGWIN__ */