| 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 2, 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 | 59 Temple Place, Suite 330, Boston, MA 02111 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 | #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 | free (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 | free (old); |
| 150 | free (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 | return 0; |
| 343 | } |
| 344 | |
| 345 | /* Here is C-u doing what Unix does. You don't *have* to use these |
| 346 | key-bindings. We have a choice of killing the entire line, or |
| 347 | killing from where we are to the start of the line. We choose the |
| 348 | latter, because if you are a Unix weenie, then you haven't backspaced |
| 349 | into the line at all, and if you aren't, then you know what you are |
| 350 | doing. */ |
| 351 | int |
| 352 | rl_unix_line_discard (count, key) |
| 353 | int count, key; |
| 354 | { |
| 355 | if (rl_point == 0) |
| 356 | rl_ding (); |
| 357 | else |
| 358 | { |
| 359 | rl_kill_text (rl_point, 0); |
| 360 | rl_point = 0; |
| 361 | if (rl_editing_mode == emacs_mode) |
| 362 | rl_mark = rl_point; |
| 363 | } |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | /* Copy the text in the `region' to the kill ring. If DELETE is non-zero, |
| 368 | delete the text from the line as well. */ |
| 369 | static int |
| 370 | region_kill_internal (delete) |
| 371 | int delete; |
| 372 | { |
| 373 | char *text; |
| 374 | |
| 375 | if (rl_mark != rl_point) |
| 376 | { |
| 377 | text = rl_copy_text (rl_point, rl_mark); |
| 378 | if (delete) |
| 379 | rl_delete_text (rl_point, rl_mark); |
| 380 | _rl_copy_to_kill_ring (text, rl_point < rl_mark); |
| 381 | } |
| 382 | |
| 383 | _rl_last_command_was_kill++; |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /* Copy the text in the region to the kill ring. */ |
| 388 | int |
| 389 | rl_copy_region_to_kill (count, ignore) |
| 390 | int count, ignore; |
| 391 | { |
| 392 | return (region_kill_internal (0)); |
| 393 | } |
| 394 | |
| 395 | /* Kill the text between the point and mark. */ |
| 396 | int |
| 397 | rl_kill_region (count, ignore) |
| 398 | int count, ignore; |
| 399 | { |
| 400 | int r, npoint; |
| 401 | |
| 402 | npoint = (rl_point < rl_mark) ? rl_point : rl_mark; |
| 403 | r = region_kill_internal (1); |
| 404 | _rl_fix_point (1); |
| 405 | rl_point = npoint; |
| 406 | return r; |
| 407 | } |
| 408 | |
| 409 | /* Copy COUNT words to the kill ring. DIR says which direction we look |
| 410 | to find the words. */ |
| 411 | static int |
| 412 | _rl_copy_word_as_kill (count, dir) |
| 413 | int count, dir; |
| 414 | { |
| 415 | int om, op, r; |
| 416 | |
| 417 | om = rl_mark; |
| 418 | op = rl_point; |
| 419 | |
| 420 | if (dir > 0) |
| 421 | rl_forward_word (count, 0); |
| 422 | else |
| 423 | rl_backward_word (count, 0); |
| 424 | |
| 425 | rl_mark = rl_point; |
| 426 | |
| 427 | if (dir > 0) |
| 428 | rl_backward_word (count, 0); |
| 429 | else |
| 430 | rl_forward_word (count, 0); |
| 431 | |
| 432 | r = region_kill_internal (0); |
| 433 | |
| 434 | rl_mark = om; |
| 435 | rl_point = op; |
| 436 | |
| 437 | return r; |
| 438 | } |
| 439 | |
| 440 | int |
| 441 | rl_copy_forward_word (count, key) |
| 442 | int count, key; |
| 443 | { |
| 444 | if (count < 0) |
| 445 | return (rl_copy_backward_word (-count, key)); |
| 446 | |
| 447 | return (_rl_copy_word_as_kill (count, 1)); |
| 448 | } |
| 449 | |
| 450 | int |
| 451 | rl_copy_backward_word (count, key) |
| 452 | int count, key; |
| 453 | { |
| 454 | if (count < 0) |
| 455 | return (rl_copy_forward_word (-count, key)); |
| 456 | |
| 457 | return (_rl_copy_word_as_kill (count, -1)); |
| 458 | } |
| 459 | |
| 460 | /* Yank back the last killed text. This ignores arguments. */ |
| 461 | int |
| 462 | rl_yank (count, ignore) |
| 463 | int count, ignore; |
| 464 | { |
| 465 | if (rl_kill_ring == 0) |
| 466 | { |
| 467 | _rl_abort_internal (); |
| 468 | return -1; |
| 469 | } |
| 470 | |
| 471 | _rl_set_mark_at_pos (rl_point); |
| 472 | rl_insert_text (rl_kill_ring[rl_kill_index]); |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | /* If the last command was yank, or yank_pop, and the text just |
| 477 | before point is identical to the current kill item, then |
| 478 | delete that text from the line, rotate the index down, and |
| 479 | yank back some other text. */ |
| 480 | int |
| 481 | rl_yank_pop (count, key) |
| 482 | int count, key; |
| 483 | { |
| 484 | int l, n; |
| 485 | |
| 486 | if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) || |
| 487 | !rl_kill_ring) |
| 488 | { |
| 489 | _rl_abort_internal (); |
| 490 | return -1; |
| 491 | } |
| 492 | |
| 493 | l = strlen (rl_kill_ring[rl_kill_index]); |
| 494 | n = rl_point - l; |
| 495 | if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l)) |
| 496 | { |
| 497 | rl_delete_text (n, rl_point); |
| 498 | rl_point = n; |
| 499 | rl_kill_index--; |
| 500 | if (rl_kill_index < 0) |
| 501 | rl_kill_index = rl_kill_ring_length - 1; |
| 502 | rl_yank (1, 0); |
| 503 | return 0; |
| 504 | } |
| 505 | else |
| 506 | { |
| 507 | _rl_abort_internal (); |
| 508 | return -1; |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | /* Yank the COUNTh argument from the previous history line, skipping |
| 513 | HISTORY_SKIP lines before looking for the `previous line'. */ |
| 514 | static int |
| 515 | rl_yank_nth_arg_internal (count, ignore, history_skip) |
| 516 | int count, ignore, history_skip; |
| 517 | { |
| 518 | register HIST_ENTRY *entry; |
| 519 | char *arg; |
| 520 | int i, pos; |
| 521 | |
| 522 | pos = where_history (); |
| 523 | |
| 524 | if (history_skip) |
| 525 | { |
| 526 | for (i = 0; i < history_skip; i++) |
| 527 | entry = previous_history (); |
| 528 | } |
| 529 | |
| 530 | entry = previous_history (); |
| 531 | |
| 532 | history_set_pos (pos); |
| 533 | |
| 534 | if (entry == 0) |
| 535 | { |
| 536 | rl_ding (); |
| 537 | return -1; |
| 538 | } |
| 539 | |
| 540 | arg = history_arg_extract (count, count, entry->line); |
| 541 | if (!arg || !*arg) |
| 542 | { |
| 543 | rl_ding (); |
| 544 | return -1; |
| 545 | } |
| 546 | |
| 547 | rl_begin_undo_group (); |
| 548 | |
| 549 | _rl_set_mark_at_pos (rl_point); |
| 550 | |
| 551 | #if defined (VI_MODE) |
| 552 | /* Vi mode always inserts a space before yanking the argument, and it |
| 553 | inserts it right *after* rl_point. */ |
| 554 | if (rl_editing_mode == vi_mode) |
| 555 | { |
| 556 | rl_vi_append_mode (1, ignore); |
| 557 | rl_insert_text (" "); |
| 558 | } |
| 559 | #endif /* VI_MODE */ |
| 560 | |
| 561 | rl_insert_text (arg); |
| 562 | free (arg); |
| 563 | |
| 564 | rl_end_undo_group (); |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | /* Yank the COUNTth argument from the previous history line. */ |
| 569 | int |
| 570 | rl_yank_nth_arg (count, ignore) |
| 571 | int count, ignore; |
| 572 | { |
| 573 | return (rl_yank_nth_arg_internal (count, ignore, 0)); |
| 574 | } |
| 575 | |
| 576 | /* Yank the last argument from the previous history line. This `knows' |
| 577 | how rl_yank_nth_arg treats a count of `$'. With an argument, this |
| 578 | behaves the same as rl_yank_nth_arg. */ |
| 579 | int |
| 580 | rl_yank_last_arg (count, key) |
| 581 | int count, key; |
| 582 | { |
| 583 | static int history_skip = 0; |
| 584 | static int explicit_arg_p = 0; |
| 585 | static int count_passed = 1; |
| 586 | static int direction = 1; |
| 587 | static int undo_needed = 0; |
| 588 | int retval; |
| 589 | |
| 590 | if (rl_last_func != rl_yank_last_arg) |
| 591 | { |
| 592 | history_skip = 0; |
| 593 | explicit_arg_p = rl_explicit_arg; |
| 594 | count_passed = count; |
| 595 | direction = 1; |
| 596 | } |
| 597 | else |
| 598 | { |
| 599 | if (undo_needed) |
| 600 | rl_do_undo (); |
| 601 | if (count < 1) |
| 602 | direction = -direction; |
| 603 | history_skip += direction; |
| 604 | if (history_skip < 0) |
| 605 | history_skip = 0; |
| 606 | } |
| 607 | |
| 608 | if (explicit_arg_p) |
| 609 | retval = rl_yank_nth_arg_internal (count_passed, key, history_skip); |
| 610 | else |
| 611 | retval = rl_yank_nth_arg_internal ('$', key, history_skip); |
| 612 | |
| 613 | undo_needed = retval == 0; |
| 614 | return retval; |
| 615 | } |
| 616 | |
| 617 | /* A special paste command for users of Cygnus's cygwin32. */ |
| 618 | #if defined (__CYGWIN__) |
| 619 | #include <windows.h> |
| 620 | |
| 621 | int |
| 622 | rl_paste_from_clipboard (count, key) |
| 623 | int count, key; |
| 624 | { |
| 625 | char *data, *ptr; |
| 626 | int len; |
| 627 | |
| 628 | if (OpenClipboard (NULL) == 0) |
| 629 | return (0); |
| 630 | |
| 631 | data = (char *)GetClipboardData (CF_TEXT); |
| 632 | if (data) |
| 633 | { |
| 634 | ptr = strchr (data, '\r'); |
| 635 | if (ptr) |
| 636 | { |
| 637 | len = ptr - data; |
| 638 | ptr = (char *)xmalloc (len + 1); |
| 639 | ptr[len] = '\0'; |
| 640 | strncpy (ptr, data, len); |
| 641 | } |
| 642 | else |
| 643 | ptr = data; |
| 644 | _rl_set_mark_at_pos (rl_point); |
| 645 | rl_insert_text (ptr); |
| 646 | if (ptr != data) |
| 647 | free (ptr); |
| 648 | CloseClipboard (); |
| 649 | } |
| 650 | return (0); |
| 651 | } |
| 652 | #endif /* __CYGWIN__ */ |