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d60d9f65 SS |
1 | /* **************************************************************** */ |
2 | /* */ | |
3 | /* I-Search and Searching */ | |
4 | /* */ | |
5 | /* **************************************************************** */ | |
6 | ||
7 | /* Copyright (C) 1987,1989 Free Software Foundation, Inc. | |
8 | ||
9 | This file contains the Readline Library (the Library), a set of | |
10 | routines for providing Emacs style line input to programs that ask | |
11 | for it. | |
12 | ||
13 | The Library is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
1b17e766 | 15 | the Free Software Foundation; either version 2, or (at your option) |
d60d9f65 SS |
16 | any later version. |
17 | ||
18 | The Library is distributed in the hope that it will be useful, but | |
19 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | General Public License for more details. | |
22 | ||
23 | The GNU General Public License is often shipped with GNU software, and | |
24 | is generally kept in a file called COPYING or LICENSE. If you do not | |
25 | have a copy of the license, write to the Free Software Foundation, | |
1b17e766 | 26 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
d60d9f65 SS |
27 | #define READLINE_LIBRARY |
28 | ||
29 | #if defined (HAVE_CONFIG_H) | |
30 | # include <config.h> | |
31 | #endif | |
32 | ||
33 | #include <sys/types.h> | |
34 | ||
35 | #include <stdio.h> | |
36 | ||
37 | #if defined (HAVE_UNISTD_H) | |
38 | # include <unistd.h> | |
39 | #endif | |
40 | ||
41 | #if defined (HAVE_STDLIB_H) | |
42 | # include <stdlib.h> | |
43 | #else | |
44 | # include "ansi_stdlib.h" | |
45 | #endif | |
46 | ||
47 | #include "rldefs.h" | |
48 | #include "readline.h" | |
49 | #include "history.h" | |
50 | ||
1b17e766 EZ |
51 | #include "rlprivate.h" |
52 | #include "xmalloc.h" | |
53 | ||
c862e87b JM |
54 | /* Variables exported to other files in the readline library. */ |
55 | unsigned char *_rl_isearch_terminators = (unsigned char *)NULL; | |
56 | ||
d60d9f65 | 57 | /* Variables imported from other files in the readline library. */ |
d60d9f65 | 58 | extern HIST_ENTRY *saved_line_for_history; |
d60d9f65 | 59 | |
1b17e766 EZ |
60 | /* Forward declarations */ |
61 | static int rl_search_history __P((int, int)); | |
d60d9f65 SS |
62 | |
63 | /* Last line found by the current incremental search, so we don't `find' | |
64 | identical lines many times in a row. */ | |
65 | static char *prev_line_found; | |
66 | ||
67 | /* Search backwards through the history looking for a string which is typed | |
68 | interactively. Start with the current line. */ | |
69 | int | |
70 | rl_reverse_search_history (sign, key) | |
71 | int sign, key; | |
72 | { | |
73 | return (rl_search_history (-sign, key)); | |
74 | } | |
75 | ||
76 | /* Search forwards through the history looking for a string which is typed | |
77 | interactively. Start with the current line. */ | |
78 | int | |
79 | rl_forward_search_history (sign, key) | |
80 | int sign, key; | |
81 | { | |
82 | return (rl_search_history (sign, key)); | |
83 | } | |
84 | ||
85 | /* Display the current state of the search in the echo-area. | |
86 | SEARCH_STRING contains the string that is being searched for, | |
87 | DIRECTION is zero for forward, or 1 for reverse, | |
88 | WHERE is the history list number of the current line. If it is | |
89 | -1, then this line is the starting one. */ | |
90 | static void | |
91 | rl_display_search (search_string, reverse_p, where) | |
92 | char *search_string; | |
93 | int reverse_p, where; | |
94 | { | |
95 | char *message; | |
96 | int msglen, searchlen; | |
97 | ||
98 | searchlen = (search_string && *search_string) ? strlen (search_string) : 0; | |
99 | ||
100 | message = xmalloc (searchlen + 33); | |
101 | msglen = 0; | |
102 | ||
103 | #if defined (NOTDEF) | |
104 | if (where != -1) | |
105 | { | |
106 | sprintf (message, "[%d]", where + history_base); | |
107 | msglen = strlen (message); | |
108 | } | |
109 | #endif /* NOTDEF */ | |
110 | ||
111 | message[msglen++] = '('; | |
112 | ||
113 | if (reverse_p) | |
114 | { | |
115 | strcpy (message + msglen, "reverse-"); | |
116 | msglen += 8; | |
117 | } | |
118 | ||
119 | strcpy (message + msglen, "i-search)`"); | |
120 | msglen += 10; | |
121 | ||
122 | if (search_string) | |
123 | { | |
124 | strcpy (message + msglen, search_string); | |
125 | msglen += searchlen; | |
126 | } | |
127 | ||
128 | strcpy (message + msglen, "': "); | |
129 | ||
130 | rl_message ("%s", message, 0); | |
131 | free (message); | |
132 | (*rl_redisplay_function) (); | |
133 | } | |
134 | ||
135 | /* Search through the history looking for an interactively typed string. | |
136 | This is analogous to i-search. We start the search in the current line. | |
137 | DIRECTION is which direction to search; >= 0 means forward, < 0 means | |
138 | backwards. */ | |
139 | static int | |
140 | rl_search_history (direction, invoking_key) | |
141 | int direction, invoking_key; | |
142 | { | |
143 | /* The string that the user types in to search for. */ | |
144 | char *search_string; | |
145 | ||
146 | /* The current length of SEARCH_STRING. */ | |
147 | int search_string_index; | |
148 | ||
149 | /* The amount of space that SEARCH_STRING has allocated to it. */ | |
150 | int search_string_size; | |
151 | ||
152 | /* The list of lines to search through. */ | |
153 | char **lines, *allocated_line; | |
154 | ||
155 | /* The length of LINES. */ | |
156 | int hlen; | |
157 | ||
158 | /* Where we get LINES from. */ | |
159 | HIST_ENTRY **hlist; | |
160 | ||
161 | register int i; | |
162 | int orig_point, orig_line, last_found_line; | |
163 | int c, found, failed, sline_len; | |
164 | ||
165 | /* The line currently being searched. */ | |
166 | char *sline; | |
167 | ||
168 | /* Offset in that line. */ | |
169 | int line_index; | |
170 | ||
171 | /* Non-zero if we are doing a reverse search. */ | |
172 | int reverse; | |
173 | ||
c862e87b JM |
174 | /* The list of characters which terminate the search, but are not |
175 | subsequently executed. If the variable isearch-terminators has | |
176 | been set, we use that value, otherwise we use ESC and C-J. */ | |
177 | unsigned char *isearch_terminators; | |
178 | ||
d60d9f65 SS |
179 | orig_point = rl_point; |
180 | last_found_line = orig_line = where_history (); | |
181 | reverse = direction < 0; | |
182 | hlist = history_list (); | |
183 | allocated_line = (char *)NULL; | |
184 | ||
c862e87b JM |
185 | isearch_terminators = _rl_isearch_terminators ? _rl_isearch_terminators |
186 | : (unsigned char *)"\033\012"; | |
187 | ||
d60d9f65 SS |
188 | /* Create an arrary of pointers to the lines that we want to search. */ |
189 | maybe_replace_line (); | |
190 | i = 0; | |
191 | if (hlist) | |
192 | for (i = 0; hlist[i]; i++); | |
193 | ||
194 | /* Allocate space for this many lines, +1 for the current input line, | |
195 | and remember those lines. */ | |
196 | lines = (char **)xmalloc ((1 + (hlen = i)) * sizeof (char *)); | |
197 | for (i = 0; i < hlen; i++) | |
198 | lines[i] = hlist[i]->line; | |
199 | ||
200 | if (saved_line_for_history) | |
201 | lines[i] = saved_line_for_history->line; | |
202 | else | |
203 | { | |
204 | /* Keep track of this so we can free it. */ | |
205 | allocated_line = xmalloc (1 + strlen (rl_line_buffer)); | |
206 | strcpy (allocated_line, &rl_line_buffer[0]); | |
207 | lines[i] = allocated_line; | |
208 | } | |
209 | ||
210 | hlen++; | |
211 | ||
212 | /* The line where we start the search. */ | |
213 | i = orig_line; | |
214 | ||
c862e87b | 215 | rl_save_prompt (); |
d60d9f65 SS |
216 | |
217 | /* Initialize search parameters. */ | |
218 | search_string = xmalloc (search_string_size = 128); | |
219 | *search_string = '\0'; | |
220 | search_string_index = 0; | |
221 | prev_line_found = (char *)0; /* XXX */ | |
222 | ||
223 | /* Normalize DIRECTION into 1 or -1. */ | |
224 | direction = (direction >= 0) ? 1 : -1; | |
225 | ||
226 | rl_display_search (search_string, reverse, -1); | |
227 | ||
228 | sline = rl_line_buffer; | |
229 | sline_len = strlen (sline); | |
230 | line_index = rl_point; | |
231 | ||
232 | found = failed = 0; | |
233 | for (;;) | |
234 | { | |
235 | Function *f = (Function *)NULL; | |
236 | ||
237 | /* Read a key and decide how to proceed. */ | |
238 | c = rl_read_key (); | |
239 | ||
240 | if (_rl_keymap[c].type == ISFUNC) | |
241 | { | |
242 | f = _rl_keymap[c].function; | |
243 | ||
244 | if (f == rl_reverse_search_history) | |
245 | c = reverse ? -1 : -2; | |
246 | else if (f == rl_forward_search_history) | |
247 | c = !reverse ? -1 : -2; | |
248 | } | |
249 | ||
c862e87b | 250 | #if 0 |
d60d9f65 SS |
251 | /* Let NEWLINE (^J) terminate the search for people who don't like |
252 | using ESC. ^M can still be used to terminate the search and | |
253 | immediately execute the command. */ | |
254 | if (c == ESC || c == NEWLINE) | |
c862e87b JM |
255 | #else |
256 | /* The characters in isearch_terminators (set from the user-settable | |
257 | variable isearch-terminators) are used to terminate the search but | |
258 | not subsequently execute the character as a command. The default | |
259 | value is "\033\012" (ESC and C-J). */ | |
260 | if (strchr (isearch_terminators, c)) | |
261 | #endif | |
d60d9f65 SS |
262 | { |
263 | /* ESC still terminates the search, but if there is pending | |
264 | input or if input arrives within 0.1 seconds (on systems | |
265 | with select(2)) it is used as a prefix character | |
266 | with rl_execute_next. WATCH OUT FOR THIS! This is intended | |
267 | to allow the arrow keys to be used like ^F and ^B are used | |
268 | to terminate the search and execute the movement command. */ | |
269 | if (c == ESC && _rl_input_available ()) /* XXX */ | |
270 | rl_execute_next (ESC); | |
271 | break; | |
272 | } | |
273 | ||
274 | if (c >= 0 && (CTRL_CHAR (c) || META_CHAR (c) || c == RUBOUT) && c != CTRL ('G')) | |
275 | { | |
276 | rl_execute_next (c); | |
277 | break; | |
278 | } | |
279 | ||
280 | switch (c) | |
281 | { | |
282 | case -1: | |
283 | if (search_string_index == 0) | |
284 | continue; | |
285 | else if (reverse) | |
286 | --line_index; | |
287 | else if (line_index != sline_len) | |
288 | ++line_index; | |
289 | else | |
290 | ding (); | |
291 | break; | |
292 | ||
293 | /* switch directions */ | |
294 | case -2: | |
295 | direction = -direction; | |
296 | reverse = direction < 0; | |
297 | break; | |
298 | ||
299 | case CTRL ('G'): | |
300 | strcpy (rl_line_buffer, lines[orig_line]); | |
301 | rl_point = orig_point; | |
302 | rl_end = strlen (rl_line_buffer); | |
c862e87b | 303 | rl_restore_prompt(); |
d60d9f65 SS |
304 | rl_clear_message (); |
305 | if (allocated_line) | |
306 | free (allocated_line); | |
307 | free (lines); | |
308 | return 0; | |
309 | ||
310 | #if 0 | |
311 | /* delete character from search string. */ | |
312 | case -3: | |
313 | if (search_string_index == 0) | |
314 | ding (); | |
315 | else | |
316 | { | |
317 | search_string[--search_string_index] = '\0'; | |
318 | /* This is tricky. To do this right, we need to keep a | |
319 | stack of search positions for the current search, with | |
320 | sentinels marking the beginning and end. */ | |
321 | } | |
322 | break; | |
323 | #endif | |
324 | ||
325 | default: | |
326 | /* Add character to search string and continue search. */ | |
327 | if (search_string_index + 2 >= search_string_size) | |
328 | { | |
329 | search_string_size += 128; | |
330 | search_string = xrealloc (search_string, search_string_size); | |
331 | } | |
332 | search_string[search_string_index++] = c; | |
333 | search_string[search_string_index] = '\0'; | |
334 | break; | |
335 | } | |
336 | ||
337 | for (found = failed = 0;;) | |
338 | { | |
339 | int limit = sline_len - search_string_index + 1; | |
340 | ||
341 | /* Search the current line. */ | |
342 | while (reverse ? (line_index >= 0) : (line_index < limit)) | |
343 | { | |
344 | if (STREQN (search_string, sline + line_index, search_string_index)) | |
345 | { | |
346 | found++; | |
347 | break; | |
348 | } | |
349 | else | |
350 | line_index += direction; | |
351 | } | |
352 | if (found) | |
353 | break; | |
354 | ||
355 | /* Move to the next line, but skip new copies of the line | |
356 | we just found and lines shorter than the string we're | |
357 | searching for. */ | |
358 | do | |
359 | { | |
360 | /* Move to the next line. */ | |
361 | i += direction; | |
362 | ||
363 | /* At limit for direction? */ | |
364 | if (reverse ? (i < 0) : (i == hlen)) | |
365 | { | |
366 | failed++; | |
367 | break; | |
368 | } | |
369 | ||
370 | /* We will need these later. */ | |
371 | sline = lines[i]; | |
372 | sline_len = strlen (sline); | |
373 | } | |
374 | while ((prev_line_found && STREQ (prev_line_found, lines[i])) || | |
375 | (search_string_index > sline_len)); | |
376 | ||
377 | if (failed) | |
378 | break; | |
379 | ||
380 | /* Now set up the line for searching... */ | |
381 | line_index = reverse ? sline_len - search_string_index : 0; | |
382 | } | |
383 | ||
384 | if (failed) | |
385 | { | |
386 | /* We cannot find the search string. Ding the bell. */ | |
387 | ding (); | |
388 | i = last_found_line; | |
389 | continue; /* XXX - was break */ | |
390 | } | |
391 | ||
392 | /* We have found the search string. Just display it. But don't | |
393 | actually move there in the history list until the user accepts | |
394 | the location. */ | |
395 | if (found) | |
396 | { | |
397 | int line_len; | |
398 | ||
399 | prev_line_found = lines[i]; | |
400 | line_len = strlen (lines[i]); | |
401 | ||
402 | if (line_len >= rl_line_buffer_len) | |
403 | rl_extend_line_buffer (line_len); | |
404 | ||
405 | strcpy (rl_line_buffer, lines[i]); | |
406 | rl_point = line_index; | |
407 | rl_end = line_len; | |
408 | last_found_line = i; | |
409 | rl_display_search (search_string, reverse, (i == orig_line) ? -1 : i); | |
410 | } | |
411 | } | |
412 | ||
413 | /* The searching is over. The user may have found the string that she | |
414 | was looking for, or else she may have exited a failing search. If | |
415 | LINE_INDEX is -1, then that shows that the string searched for was | |
416 | not found. We use this to determine where to place rl_point. */ | |
417 | ||
418 | /* First put back the original state. */ | |
419 | strcpy (rl_line_buffer, lines[orig_line]); | |
420 | ||
c862e87b | 421 | rl_restore_prompt (); |
d60d9f65 SS |
422 | |
423 | /* Free the search string. */ | |
424 | free (search_string); | |
425 | ||
426 | if (last_found_line < orig_line) | |
c862e87b | 427 | rl_get_previous_history (orig_line - last_found_line, 0); |
d60d9f65 | 428 | else |
c862e87b | 429 | rl_get_next_history (last_found_line - orig_line, 0); |
d60d9f65 SS |
430 | |
431 | /* If the string was not found, put point at the end of the line. */ | |
432 | if (line_index < 0) | |
433 | line_index = strlen (rl_line_buffer); | |
434 | rl_point = line_index; | |
435 | rl_clear_message (); | |
436 | ||
437 | if (allocated_line) | |
438 | free (allocated_line); | |
439 | free (lines); | |
440 | ||
441 | return 0; | |
442 | } |