| 1 | /* search.c - code for non-incremental searching in emacs and vi modes. */ |
| 2 | |
| 3 | /* Copyright (C) 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the Readline Library (the Library), a set of |
| 6 | routines for providing Emacs style line input to programs that ask |
| 7 | for it. |
| 8 | |
| 9 | The Library is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2, or (at your option) |
| 12 | any later version. |
| 13 | |
| 14 | The Library is distributed in the hope that it will be useful, but |
| 15 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | General Public License for more details. |
| 18 | |
| 19 | The GNU General Public License is often shipped with GNU software, and |
| 20 | is generally kept in a file called COPYING or LICENSE. If you do not |
| 21 | have a copy of the license, write to the Free Software Foundation, |
| 22 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
| 23 | #define READLINE_LIBRARY |
| 24 | |
| 25 | #if defined (HAVE_CONFIG_H) |
| 26 | # include <config.h> |
| 27 | #endif |
| 28 | |
| 29 | #include <sys/types.h> |
| 30 | #include <stdio.h> |
| 31 | |
| 32 | #if defined (HAVE_UNISTD_H) |
| 33 | # include <unistd.h> |
| 34 | #endif |
| 35 | |
| 36 | #if defined (HAVE_STDLIB_H) |
| 37 | # include <stdlib.h> |
| 38 | #else |
| 39 | # include "ansi_stdlib.h" |
| 40 | #endif |
| 41 | |
| 42 | #include "rldefs.h" |
| 43 | #include "readline.h" |
| 44 | #include "history.h" |
| 45 | |
| 46 | #include "rlprivate.h" |
| 47 | #include "xmalloc.h" |
| 48 | |
| 49 | #ifdef abs |
| 50 | # undef abs |
| 51 | #endif |
| 52 | #define abs(x) (((x) >= 0) ? (x) : -(x)) |
| 53 | |
| 54 | extern HIST_ENTRY *saved_line_for_history; |
| 55 | |
| 56 | /* Functions imported from the rest of the library. */ |
| 57 | extern int _rl_free_history_entry __P((HIST_ENTRY *)); |
| 58 | |
| 59 | static char *noninc_search_string = (char *) NULL; |
| 60 | static int noninc_history_pos; |
| 61 | |
| 62 | static char *prev_line_found = (char *) NULL; |
| 63 | |
| 64 | static int rl_history_search_len; |
| 65 | static int rl_history_search_pos; |
| 66 | static char *history_search_string; |
| 67 | static int history_string_size; |
| 68 | |
| 69 | /* Make the data from the history entry ENTRY be the contents of the |
| 70 | current line. This doesn't do anything with rl_point; the caller |
| 71 | must set it. */ |
| 72 | static void |
| 73 | make_history_line_current (entry) |
| 74 | HIST_ENTRY *entry; |
| 75 | { |
| 76 | int line_len; |
| 77 | |
| 78 | line_len = strlen (entry->line); |
| 79 | if (line_len >= rl_line_buffer_len) |
| 80 | rl_extend_line_buffer (line_len); |
| 81 | strcpy (rl_line_buffer, entry->line); |
| 82 | |
| 83 | rl_undo_list = (UNDO_LIST *)entry->data; |
| 84 | rl_end = line_len; |
| 85 | |
| 86 | if (saved_line_for_history) |
| 87 | _rl_free_history_entry (saved_line_for_history); |
| 88 | saved_line_for_history = (HIST_ENTRY *)NULL; |
| 89 | } |
| 90 | |
| 91 | /* Search the history list for STRING starting at absolute history position |
| 92 | POS. If STRING begins with `^', the search must match STRING at the |
| 93 | beginning of a history line, otherwise a full substring match is performed |
| 94 | for STRING. DIR < 0 means to search backwards through the history list, |
| 95 | DIR >= 0 means to search forward. */ |
| 96 | static int |
| 97 | noninc_search_from_pos (string, pos, dir) |
| 98 | char *string; |
| 99 | int pos, dir; |
| 100 | { |
| 101 | int ret, old; |
| 102 | |
| 103 | old = where_history (); |
| 104 | history_set_pos (pos); |
| 105 | |
| 106 | if (*string == '^') |
| 107 | ret = history_search_prefix (string + 1, dir); |
| 108 | else |
| 109 | ret = history_search (string, dir); |
| 110 | |
| 111 | if (ret != -1) |
| 112 | ret = where_history (); |
| 113 | |
| 114 | history_set_pos (old); |
| 115 | return (ret); |
| 116 | } |
| 117 | |
| 118 | /* Search for a line in the history containing STRING. If DIR is < 0, the |
| 119 | search is backwards through previous entries, else through subsequent |
| 120 | entries. */ |
| 121 | static void |
| 122 | noninc_dosearch (string, dir) |
| 123 | char *string; |
| 124 | int dir; |
| 125 | { |
| 126 | int oldpos, pos; |
| 127 | HIST_ENTRY *entry; |
| 128 | |
| 129 | if (string == 0 || *string == '\0' || noninc_history_pos < 0) |
| 130 | { |
| 131 | ding (); |
| 132 | return; |
| 133 | } |
| 134 | |
| 135 | pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir); |
| 136 | if (pos == -1) |
| 137 | { |
| 138 | /* Search failed, current history position unchanged. */ |
| 139 | maybe_unsave_line (); |
| 140 | rl_clear_message (); |
| 141 | rl_point = 0; |
| 142 | ding (); |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | noninc_history_pos = pos; |
| 147 | |
| 148 | oldpos = where_history (); |
| 149 | history_set_pos (noninc_history_pos); |
| 150 | entry = current_history (); |
| 151 | #if defined (VI_MODE) |
| 152 | if (rl_editing_mode != vi_mode) |
| 153 | #endif |
| 154 | history_set_pos (oldpos); |
| 155 | |
| 156 | make_history_line_current (entry); |
| 157 | |
| 158 | rl_point = 0; |
| 159 | rl_clear_message (); |
| 160 | } |
| 161 | |
| 162 | /* Search non-interactively through the history list. DIR < 0 means to |
| 163 | search backwards through the history of previous commands; otherwise |
| 164 | the search is for commands subsequent to the current position in the |
| 165 | history list. PCHAR is the character to use for prompting when reading |
| 166 | the search string; if not specified (0), it defaults to `:'. */ |
| 167 | static void |
| 168 | noninc_search (dir, pchar) |
| 169 | int dir; |
| 170 | int pchar; |
| 171 | { |
| 172 | int saved_point, c; |
| 173 | char *p; |
| 174 | |
| 175 | maybe_save_line (); |
| 176 | saved_point = rl_point; |
| 177 | |
| 178 | /* Use the line buffer to read the search string. */ |
| 179 | rl_line_buffer[0] = 0; |
| 180 | rl_end = rl_point = 0; |
| 181 | |
| 182 | p = _rl_make_prompt_for_search (pchar ? pchar : ':'); |
| 183 | rl_message (p, 0, 0); |
| 184 | free (p); |
| 185 | |
| 186 | #define SEARCH_RETURN rl_restore_prompt (); return |
| 187 | |
| 188 | /* Read the search string. */ |
| 189 | while (c = rl_read_key ()) |
| 190 | { |
| 191 | switch (c) |
| 192 | { |
| 193 | case CTRL('H'): |
| 194 | case RUBOUT: |
| 195 | if (rl_point == 0) |
| 196 | { |
| 197 | maybe_unsave_line (); |
| 198 | rl_clear_message (); |
| 199 | rl_point = saved_point; |
| 200 | SEARCH_RETURN; |
| 201 | } |
| 202 | rl_rubout (1, c); |
| 203 | break; |
| 204 | |
| 205 | case CTRL('W'): |
| 206 | rl_unix_word_rubout (1, c); |
| 207 | break; |
| 208 | |
| 209 | case CTRL('U'): |
| 210 | rl_unix_line_discard (1, c); |
| 211 | break; |
| 212 | |
| 213 | case RETURN: |
| 214 | case NEWLINE: |
| 215 | goto dosearch; |
| 216 | /* NOTREACHED */ |
| 217 | break; |
| 218 | |
| 219 | case CTRL('C'): |
| 220 | case CTRL('G'): |
| 221 | maybe_unsave_line (); |
| 222 | rl_clear_message (); |
| 223 | rl_point = saved_point; |
| 224 | ding (); |
| 225 | SEARCH_RETURN; |
| 226 | |
| 227 | default: |
| 228 | rl_insert (1, c); |
| 229 | break; |
| 230 | } |
| 231 | (*rl_redisplay_function) (); |
| 232 | } |
| 233 | |
| 234 | dosearch: |
| 235 | /* If rl_point == 0, we want to re-use the previous search string and |
| 236 | start from the saved history position. If there's no previous search |
| 237 | string, punt. */ |
| 238 | if (rl_point == 0) |
| 239 | { |
| 240 | if (!noninc_search_string) |
| 241 | { |
| 242 | ding (); |
| 243 | SEARCH_RETURN; |
| 244 | } |
| 245 | } |
| 246 | else |
| 247 | { |
| 248 | /* We want to start the search from the current history position. */ |
| 249 | noninc_history_pos = where_history (); |
| 250 | FREE (noninc_search_string); |
| 251 | noninc_search_string = savestring (rl_line_buffer); |
| 252 | } |
| 253 | |
| 254 | rl_restore_prompt (); |
| 255 | noninc_dosearch (noninc_search_string, dir); |
| 256 | } |
| 257 | |
| 258 | /* Search forward through the history list for a string. If the vi-mode |
| 259 | code calls this, KEY will be `?'. */ |
| 260 | int |
| 261 | rl_noninc_forward_search (count, key) |
| 262 | int count, key; |
| 263 | { |
| 264 | noninc_search (1, (key == '?') ? '?' : 0); |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | /* Reverse search the history list for a string. If the vi-mode code |
| 269 | calls this, KEY will be `/'. */ |
| 270 | int |
| 271 | rl_noninc_reverse_search (count, key) |
| 272 | int count, key; |
| 273 | { |
| 274 | noninc_search (-1, (key == '/') ? '/' : 0); |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /* Search forward through the history list for the last string searched |
| 279 | for. If there is no saved search string, abort. */ |
| 280 | int |
| 281 | rl_noninc_forward_search_again (count, key) |
| 282 | int count, key; |
| 283 | { |
| 284 | if (!noninc_search_string) |
| 285 | { |
| 286 | ding (); |
| 287 | return (-1); |
| 288 | } |
| 289 | noninc_dosearch (noninc_search_string, 1); |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | /* Reverse search in the history list for the last string searched |
| 294 | for. If there is no saved search string, abort. */ |
| 295 | int |
| 296 | rl_noninc_reverse_search_again (count, key) |
| 297 | int count, key; |
| 298 | { |
| 299 | if (!noninc_search_string) |
| 300 | { |
| 301 | ding (); |
| 302 | return (-1); |
| 303 | } |
| 304 | noninc_dosearch (noninc_search_string, -1); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static int |
| 309 | rl_history_search_internal (count, dir) |
| 310 | int count, dir; |
| 311 | { |
| 312 | HIST_ENTRY *temp; |
| 313 | int ret, oldpos; |
| 314 | |
| 315 | maybe_save_line (); |
| 316 | temp = (HIST_ENTRY *)NULL; |
| 317 | |
| 318 | /* Search COUNT times through the history for a line whose prefix |
| 319 | matches history_search_string. When this loop finishes, TEMP, |
| 320 | if non-null, is the history line to copy into the line buffer. */ |
| 321 | while (count) |
| 322 | { |
| 323 | ret = noninc_search_from_pos (history_search_string, rl_history_search_pos + dir, dir); |
| 324 | if (ret == -1) |
| 325 | break; |
| 326 | |
| 327 | /* Get the history entry we found. */ |
| 328 | rl_history_search_pos = ret; |
| 329 | oldpos = where_history (); |
| 330 | history_set_pos (rl_history_search_pos); |
| 331 | temp = current_history (); |
| 332 | history_set_pos (oldpos); |
| 333 | |
| 334 | /* Don't find multiple instances of the same line. */ |
| 335 | if (prev_line_found && STREQ (prev_line_found, temp->line)) |
| 336 | continue; |
| 337 | prev_line_found = temp->line; |
| 338 | count--; |
| 339 | } |
| 340 | |
| 341 | /* If we didn't find anything at all, return. */ |
| 342 | if (temp == 0) |
| 343 | { |
| 344 | maybe_unsave_line (); |
| 345 | ding (); |
| 346 | /* If you don't want the saved history line (last match) to show up |
| 347 | in the line buffer after the search fails, change the #if 0 to |
| 348 | #if 1 */ |
| 349 | #if 0 |
| 350 | if (rl_point > rl_history_search_len) |
| 351 | { |
| 352 | rl_point = rl_end = rl_history_search_len; |
| 353 | rl_line_buffer[rl_end] = '\0'; |
| 354 | } |
| 355 | #else |
| 356 | rl_point = rl_history_search_len; /* maybe_unsave_line changes it */ |
| 357 | #endif |
| 358 | return 1; |
| 359 | } |
| 360 | |
| 361 | /* Copy the line we found into the current line buffer. */ |
| 362 | make_history_line_current (temp); |
| 363 | |
| 364 | rl_point = rl_history_search_len; |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static void |
| 369 | rl_history_search_reinit () |
| 370 | { |
| 371 | rl_history_search_pos = where_history (); |
| 372 | rl_history_search_len = rl_point; |
| 373 | prev_line_found = (char *)NULL; |
| 374 | if (rl_point) |
| 375 | { |
| 376 | if (rl_history_search_len >= history_string_size - 2) |
| 377 | { |
| 378 | history_string_size = rl_history_search_len + 2; |
| 379 | history_search_string = xrealloc (history_search_string, history_string_size); |
| 380 | } |
| 381 | history_search_string[0] = '^'; |
| 382 | strncpy (history_search_string + 1, rl_line_buffer, rl_point); |
| 383 | history_search_string[rl_point + 1] = '\0'; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | /* Search forward in the history for the string of characters |
| 388 | from the start of the line to rl_point. This is a non-incremental |
| 389 | search. */ |
| 390 | int |
| 391 | rl_history_search_forward (count, ignore) |
| 392 | int count, ignore; |
| 393 | { |
| 394 | if (count == 0) |
| 395 | return (0); |
| 396 | |
| 397 | if (rl_last_func != rl_history_search_forward && |
| 398 | rl_last_func != rl_history_search_backward) |
| 399 | rl_history_search_reinit (); |
| 400 | |
| 401 | if (rl_history_search_len == 0) |
| 402 | return (rl_get_next_history (count, ignore)); |
| 403 | return (rl_history_search_internal (abs (count), (count > 0) ? 1 : -1)); |
| 404 | } |
| 405 | |
| 406 | /* Search backward through the history for the string of characters |
| 407 | from the start of the line to rl_point. This is a non-incremental |
| 408 | search. */ |
| 409 | int |
| 410 | rl_history_search_backward (count, ignore) |
| 411 | int count, ignore; |
| 412 | { |
| 413 | if (count == 0) |
| 414 | return (0); |
| 415 | |
| 416 | if (rl_last_func != rl_history_search_forward && |
| 417 | rl_last_func != rl_history_search_backward) |
| 418 | rl_history_search_reinit (); |
| 419 | |
| 420 | if (rl_history_search_len == 0) |
| 421 | return (rl_get_previous_history (count, ignore)); |
| 422 | return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1)); |
| 423 | } |