| 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 1, 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 | 675 Mass Ave, Cambridge, MA 02139, 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 | #ifdef abs |
| 47 | # undef abs |
| 48 | #endif |
| 49 | #define abs(x) (((x) >= 0) ? (x) : -(x)) |
| 50 | |
| 51 | extern char *xmalloc (), *xrealloc (); |
| 52 | |
| 53 | /* Variables imported from readline.c */ |
| 54 | extern int rl_point, rl_end, rl_line_buffer_len; |
| 55 | extern int rl_editing_mode; |
| 56 | extern char *rl_prompt; |
| 57 | extern char *rl_line_buffer; |
| 58 | extern HIST_ENTRY *saved_line_for_history; |
| 59 | extern Function *rl_last_func; |
| 60 | |
| 61 | /* Functions imported from the rest of the library. */ |
| 62 | extern int _rl_free_history_entry (); |
| 63 | extern char *_rl_make_prompt_for_search (); |
| 64 | extern void rl_extend_line_buffer (); |
| 65 | |
| 66 | static char *noninc_search_string = (char *) NULL; |
| 67 | static int noninc_history_pos; |
| 68 | static char *prev_line_found = (char *) NULL; |
| 69 | |
| 70 | /* Search the history list for STRING starting at absolute history position |
| 71 | POS. If STRING begins with `^', the search must match STRING at the |
| 72 | beginning of a history line, otherwise a full substring match is performed |
| 73 | for STRING. DIR < 0 means to search backwards through the history list, |
| 74 | DIR >= 0 means to search forward. */ |
| 75 | static int |
| 76 | noninc_search_from_pos (string, pos, dir) |
| 77 | char *string; |
| 78 | int pos, dir; |
| 79 | { |
| 80 | int ret, old; |
| 81 | |
| 82 | old = where_history (); |
| 83 | history_set_pos (pos); |
| 84 | |
| 85 | if (*string == '^') |
| 86 | ret = history_search_prefix (string + 1, dir); |
| 87 | else |
| 88 | ret = history_search (string, dir); |
| 89 | |
| 90 | if (ret != -1) |
| 91 | ret = where_history (); |
| 92 | |
| 93 | history_set_pos (old); |
| 94 | return (ret); |
| 95 | } |
| 96 | |
| 97 | /* Search for a line in the history containing STRING. If DIR is < 0, the |
| 98 | search is backwards through previous entries, else through subsequent |
| 99 | entries. */ |
| 100 | static void |
| 101 | noninc_dosearch (string, dir) |
| 102 | char *string; |
| 103 | int dir; |
| 104 | { |
| 105 | int oldpos, pos, line_len; |
| 106 | HIST_ENTRY *entry; |
| 107 | |
| 108 | if (string == 0 || *string == '\0' || noninc_history_pos < 0) |
| 109 | { |
| 110 | ding (); |
| 111 | return; |
| 112 | } |
| 113 | |
| 114 | pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir); |
| 115 | if (pos == -1) |
| 116 | { |
| 117 | /* Search failed, current history position unchanged. */ |
| 118 | maybe_unsave_line (); |
| 119 | rl_clear_message (); |
| 120 | rl_point = 0; |
| 121 | ding (); |
| 122 | return; |
| 123 | } |
| 124 | |
| 125 | noninc_history_pos = pos; |
| 126 | |
| 127 | oldpos = where_history (); |
| 128 | history_set_pos (noninc_history_pos); |
| 129 | entry = current_history (); |
| 130 | #if defined (VI_MODE) |
| 131 | if (rl_editing_mode != vi_mode) |
| 132 | #endif |
| 133 | history_set_pos (oldpos); |
| 134 | |
| 135 | line_len = strlen (entry->line); |
| 136 | if (line_len >= rl_line_buffer_len) |
| 137 | rl_extend_line_buffer (line_len); |
| 138 | strcpy (rl_line_buffer, entry->line); |
| 139 | |
| 140 | rl_undo_list = (UNDO_LIST *)entry->data; |
| 141 | rl_end = strlen (rl_line_buffer); |
| 142 | rl_point = 0; |
| 143 | rl_clear_message (); |
| 144 | |
| 145 | if (saved_line_for_history) |
| 146 | _rl_free_history_entry (saved_line_for_history); |
| 147 | saved_line_for_history = (HIST_ENTRY *)NULL; |
| 148 | } |
| 149 | |
| 150 | /* Search non-interactively through the history list. DIR < 0 means to |
| 151 | search backwards through the history of previous commands; otherwise |
| 152 | the search is for commands subsequent to the current position in the |
| 153 | history list. PCHAR is the character to use for prompting when reading |
| 154 | the search string; if not specified (0), it defaults to `:'. */ |
| 155 | static void |
| 156 | noninc_search (dir, pchar) |
| 157 | int dir; |
| 158 | int pchar; |
| 159 | { |
| 160 | int saved_point, c; |
| 161 | char *p; |
| 162 | |
| 163 | maybe_save_line (); |
| 164 | saved_point = rl_point; |
| 165 | |
| 166 | /* Use the line buffer to read the search string. */ |
| 167 | rl_line_buffer[0] = 0; |
| 168 | rl_end = rl_point = 0; |
| 169 | |
| 170 | p = _rl_make_prompt_for_search (pchar ? pchar : ':'); |
| 171 | rl_message (p, 0, 0); |
| 172 | free (p); |
| 173 | |
| 174 | #define SEARCH_RETURN rl_restore_prompt (); return |
| 175 | |
| 176 | /* Read the search string. */ |
| 177 | while (c = rl_read_key ()) |
| 178 | { |
| 179 | switch (c) |
| 180 | { |
| 181 | case CTRL('H'): |
| 182 | case RUBOUT: |
| 183 | if (rl_point == 0) |
| 184 | { |
| 185 | maybe_unsave_line (); |
| 186 | rl_clear_message (); |
| 187 | rl_point = saved_point; |
| 188 | SEARCH_RETURN; |
| 189 | } |
| 190 | rl_rubout (1, c); |
| 191 | break; |
| 192 | |
| 193 | case CTRL('W'): |
| 194 | rl_unix_word_rubout (1, c); |
| 195 | break; |
| 196 | |
| 197 | case CTRL('U'): |
| 198 | rl_unix_line_discard (1, c); |
| 199 | break; |
| 200 | |
| 201 | case RETURN: |
| 202 | case NEWLINE: |
| 203 | goto dosearch; |
| 204 | /* NOTREACHED */ |
| 205 | break; |
| 206 | |
| 207 | case CTRL('C'): |
| 208 | case CTRL('G'): |
| 209 | maybe_unsave_line (); |
| 210 | rl_clear_message (); |
| 211 | rl_point = saved_point; |
| 212 | ding (); |
| 213 | SEARCH_RETURN; |
| 214 | |
| 215 | default: |
| 216 | rl_insert (1, c); |
| 217 | break; |
| 218 | } |
| 219 | (*rl_redisplay_function) (); |
| 220 | } |
| 221 | |
| 222 | dosearch: |
| 223 | /* If rl_point == 0, we want to re-use the previous search string and |
| 224 | start from the saved history position. If there's no previous search |
| 225 | string, punt. */ |
| 226 | if (rl_point == 0) |
| 227 | { |
| 228 | if (!noninc_search_string) |
| 229 | { |
| 230 | ding (); |
| 231 | SEARCH_RETURN; |
| 232 | } |
| 233 | } |
| 234 | else |
| 235 | { |
| 236 | /* We want to start the search from the current history position. */ |
| 237 | noninc_history_pos = where_history (); |
| 238 | if (noninc_search_string) |
| 239 | free (noninc_search_string); |
| 240 | noninc_search_string = savestring (rl_line_buffer); |
| 241 | } |
| 242 | |
| 243 | rl_restore_prompt (); |
| 244 | noninc_dosearch (noninc_search_string, dir); |
| 245 | } |
| 246 | |
| 247 | /* Search forward through the history list for a string. If the vi-mode |
| 248 | code calls this, KEY will be `?'. */ |
| 249 | int |
| 250 | rl_noninc_forward_search (count, key) |
| 251 | int count, key; |
| 252 | { |
| 253 | noninc_search (1, (key == '?') ? '?' : 0); |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | /* Reverse search the history list for a string. If the vi-mode code |
| 258 | calls this, KEY will be `/'. */ |
| 259 | int |
| 260 | rl_noninc_reverse_search (count, key) |
| 261 | int count, key; |
| 262 | { |
| 263 | noninc_search (-1, (key == '/') ? '/' : 0); |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | /* Search forward through the history list for the last string searched |
| 268 | for. If there is no saved search string, abort. */ |
| 269 | int |
| 270 | rl_noninc_forward_search_again (count, key) |
| 271 | int count, key; |
| 272 | { |
| 273 | if (!noninc_search_string) |
| 274 | { |
| 275 | ding (); |
| 276 | return (-1); |
| 277 | } |
| 278 | noninc_dosearch (noninc_search_string, 1); |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | /* Reverse search in the history list for the last string searched |
| 283 | for. If there is no saved search string, abort. */ |
| 284 | int |
| 285 | rl_noninc_reverse_search_again (count, key) |
| 286 | int count, key; |
| 287 | { |
| 288 | if (!noninc_search_string) |
| 289 | { |
| 290 | ding (); |
| 291 | return (-1); |
| 292 | } |
| 293 | noninc_dosearch (noninc_search_string, -1); |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | static int |
| 298 | rl_history_search_internal (count, direction) |
| 299 | int count, direction; |
| 300 | { |
| 301 | HIST_ENTRY *temp, *old_temp; |
| 302 | int line_len; |
| 303 | |
| 304 | maybe_save_line (); |
| 305 | |
| 306 | temp = old_temp = (HIST_ENTRY *)NULL; |
| 307 | while (count) |
| 308 | { |
| 309 | temp = (direction < 0) ? previous_history () : next_history (); |
| 310 | if (temp == 0) |
| 311 | break; |
| 312 | /* On an empty prefix, make this the same as previous-history. */ |
| 313 | if (rl_point == 0) |
| 314 | { |
| 315 | count--; |
| 316 | continue; |
| 317 | } |
| 318 | if (STREQN (rl_line_buffer, temp->line, rl_point)) |
| 319 | { |
| 320 | /* Don't find multiple instances of the same line. */ |
| 321 | if (prev_line_found && STREQ (prev_line_found, temp->line)) |
| 322 | continue; |
| 323 | if (direction < 0) |
| 324 | old_temp = temp; |
| 325 | prev_line_found = temp->line; |
| 326 | count--; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | if (temp == 0) |
| 331 | { |
| 332 | if (direction < 0 && old_temp) |
| 333 | temp = old_temp; |
| 334 | else |
| 335 | { |
| 336 | maybe_unsave_line (); |
| 337 | ding (); |
| 338 | return 1; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | line_len = strlen (temp->line); |
| 343 | if (line_len >= rl_line_buffer_len) |
| 344 | rl_extend_line_buffer (line_len); |
| 345 | strcpy (rl_line_buffer, temp->line); |
| 346 | rl_undo_list = (UNDO_LIST *)temp->data; |
| 347 | rl_end = line_len; |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | /* Search forward in the history for the string of characters |
| 352 | from the start of the line to rl_point. This is a non-incremental |
| 353 | search. */ |
| 354 | int |
| 355 | rl_history_search_forward (count, ignore) |
| 356 | int count, ignore; |
| 357 | { |
| 358 | if (count == 0) |
| 359 | return (0); |
| 360 | if (rl_last_func != rl_history_search_forward) |
| 361 | prev_line_found = (char *)NULL; |
| 362 | return (rl_history_search_internal (abs (count), (count > 0) ? 1 : -1)); |
| 363 | } |
| 364 | |
| 365 | /* Search backward through the history for the string of characters |
| 366 | from the start of the line to rl_point. This is a non-incremental |
| 367 | search. */ |
| 368 | int |
| 369 | rl_history_search_backward (count, ignore) |
| 370 | int count, ignore; |
| 371 | { |
| 372 | if (count == 0) |
| 373 | return (0); |
| 374 | if (rl_last_func != rl_history_search_backward) |
| 375 | prev_line_found = (char *)NULL; |
| 376 | return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1)); |
| 377 | } |