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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 | |
15 | the Free Software Foundation; either version 1, or (at your option) | |
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, | |
26 | 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
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 | ||
c862e87b JM |
51 | /* Variables exported to other files in the readline library. */ |
52 | unsigned char *_rl_isearch_terminators = (unsigned char *)NULL; | |
53 | ||
d60d9f65 SS |
54 | /* Variables imported from other files in the readline library. */ |
55 | extern Keymap _rl_keymap; | |
56 | extern HIST_ENTRY *saved_line_for_history; | |
57 | extern int rl_line_buffer_len; | |
58 | extern int rl_point, rl_end; | |
59 | extern char *rl_line_buffer; | |
60 | ||
d60d9f65 SS |
61 | extern int rl_execute_next (); |
62 | extern void rl_extend_line_buffer (); | |
63 | ||
64 | extern int _rl_input_available (); | |
65 | ||
66 | extern char *xmalloc (), *xrealloc (); | |
67 | ||
68 | static int rl_search_history (); | |
69 | ||
70 | /* Last line found by the current incremental search, so we don't `find' | |
71 | identical lines many times in a row. */ | |
72 | static char *prev_line_found; | |
73 | ||
74 | /* Search backwards through the history looking for a string which is typed | |
75 | interactively. Start with the current line. */ | |
76 | int | |
77 | rl_reverse_search_history (sign, key) | |
78 | int sign, key; | |
79 | { | |
80 | return (rl_search_history (-sign, key)); | |
81 | } | |
82 | ||
83 | /* Search forwards through the history looking for a string which is typed | |
84 | interactively. Start with the current line. */ | |
85 | int | |
86 | rl_forward_search_history (sign, key) | |
87 | int sign, key; | |
88 | { | |
89 | return (rl_search_history (sign, key)); | |
90 | } | |
91 | ||
92 | /* Display the current state of the search in the echo-area. | |
93 | SEARCH_STRING contains the string that is being searched for, | |
94 | DIRECTION is zero for forward, or 1 for reverse, | |
95 | WHERE is the history list number of the current line. If it is | |
96 | -1, then this line is the starting one. */ | |
97 | static void | |
98 | rl_display_search (search_string, reverse_p, where) | |
99 | char *search_string; | |
100 | int reverse_p, where; | |
101 | { | |
102 | char *message; | |
103 | int msglen, searchlen; | |
104 | ||
105 | searchlen = (search_string && *search_string) ? strlen (search_string) : 0; | |
106 | ||
107 | message = xmalloc (searchlen + 33); | |
108 | msglen = 0; | |
109 | ||
110 | #if defined (NOTDEF) | |
111 | if (where != -1) | |
112 | { | |
113 | sprintf (message, "[%d]", where + history_base); | |
114 | msglen = strlen (message); | |
115 | } | |
116 | #endif /* NOTDEF */ | |
117 | ||
118 | message[msglen++] = '('; | |
119 | ||
120 | if (reverse_p) | |
121 | { | |
122 | strcpy (message + msglen, "reverse-"); | |
123 | msglen += 8; | |
124 | } | |
125 | ||
126 | strcpy (message + msglen, "i-search)`"); | |
127 | msglen += 10; | |
128 | ||
129 | if (search_string) | |
130 | { | |
131 | strcpy (message + msglen, search_string); | |
132 | msglen += searchlen; | |
133 | } | |
134 | ||
135 | strcpy (message + msglen, "': "); | |
136 | ||
137 | rl_message ("%s", message, 0); | |
138 | free (message); | |
139 | (*rl_redisplay_function) (); | |
140 | } | |
141 | ||
142 | /* Search through the history looking for an interactively typed string. | |
143 | This is analogous to i-search. We start the search in the current line. | |
144 | DIRECTION is which direction to search; >= 0 means forward, < 0 means | |
145 | backwards. */ | |
146 | static int | |
147 | rl_search_history (direction, invoking_key) | |
148 | int direction, invoking_key; | |
149 | { | |
150 | /* The string that the user types in to search for. */ | |
151 | char *search_string; | |
152 | ||
153 | /* The current length of SEARCH_STRING. */ | |
154 | int search_string_index; | |
155 | ||
156 | /* The amount of space that SEARCH_STRING has allocated to it. */ | |
157 | int search_string_size; | |
158 | ||
159 | /* The list of lines to search through. */ | |
160 | char **lines, *allocated_line; | |
161 | ||
162 | /* The length of LINES. */ | |
163 | int hlen; | |
164 | ||
165 | /* Where we get LINES from. */ | |
166 | HIST_ENTRY **hlist; | |
167 | ||
168 | register int i; | |
169 | int orig_point, orig_line, last_found_line; | |
170 | int c, found, failed, sline_len; | |
171 | ||
172 | /* The line currently being searched. */ | |
173 | char *sline; | |
174 | ||
175 | /* Offset in that line. */ | |
176 | int line_index; | |
177 | ||
178 | /* Non-zero if we are doing a reverse search. */ | |
179 | int reverse; | |
180 | ||
c862e87b JM |
181 | /* The list of characters which terminate the search, but are not |
182 | subsequently executed. If the variable isearch-terminators has | |
183 | been set, we use that value, otherwise we use ESC and C-J. */ | |
184 | unsigned char *isearch_terminators; | |
185 | ||
d60d9f65 SS |
186 | orig_point = rl_point; |
187 | last_found_line = orig_line = where_history (); | |
188 | reverse = direction < 0; | |
189 | hlist = history_list (); | |
190 | allocated_line = (char *)NULL; | |
191 | ||
c862e87b JM |
192 | isearch_terminators = _rl_isearch_terminators ? _rl_isearch_terminators |
193 | : (unsigned char *)"\033\012"; | |
194 | ||
d60d9f65 SS |
195 | /* Create an arrary of pointers to the lines that we want to search. */ |
196 | maybe_replace_line (); | |
197 | i = 0; | |
198 | if (hlist) | |
199 | for (i = 0; hlist[i]; i++); | |
200 | ||
201 | /* Allocate space for this many lines, +1 for the current input line, | |
202 | and remember those lines. */ | |
203 | lines = (char **)xmalloc ((1 + (hlen = i)) * sizeof (char *)); | |
204 | for (i = 0; i < hlen; i++) | |
205 | lines[i] = hlist[i]->line; | |
206 | ||
207 | if (saved_line_for_history) | |
208 | lines[i] = saved_line_for_history->line; | |
209 | else | |
210 | { | |
211 | /* Keep track of this so we can free it. */ | |
212 | allocated_line = xmalloc (1 + strlen (rl_line_buffer)); | |
213 | strcpy (allocated_line, &rl_line_buffer[0]); | |
214 | lines[i] = allocated_line; | |
215 | } | |
216 | ||
217 | hlen++; | |
218 | ||
219 | /* The line where we start the search. */ | |
220 | i = orig_line; | |
221 | ||
c862e87b | 222 | rl_save_prompt (); |
d60d9f65 SS |
223 | |
224 | /* Initialize search parameters. */ | |
225 | search_string = xmalloc (search_string_size = 128); | |
226 | *search_string = '\0'; | |
227 | search_string_index = 0; | |
228 | prev_line_found = (char *)0; /* XXX */ | |
229 | ||
230 | /* Normalize DIRECTION into 1 or -1. */ | |
231 | direction = (direction >= 0) ? 1 : -1; | |
232 | ||
233 | rl_display_search (search_string, reverse, -1); | |
234 | ||
235 | sline = rl_line_buffer; | |
236 | sline_len = strlen (sline); | |
237 | line_index = rl_point; | |
238 | ||
239 | found = failed = 0; | |
240 | for (;;) | |
241 | { | |
242 | Function *f = (Function *)NULL; | |
243 | ||
244 | /* Read a key and decide how to proceed. */ | |
245 | c = rl_read_key (); | |
246 | ||
247 | if (_rl_keymap[c].type == ISFUNC) | |
248 | { | |
249 | f = _rl_keymap[c].function; | |
250 | ||
251 | if (f == rl_reverse_search_history) | |
252 | c = reverse ? -1 : -2; | |
253 | else if (f == rl_forward_search_history) | |
254 | c = !reverse ? -1 : -2; | |
255 | } | |
256 | ||
c862e87b | 257 | #if 0 |
d60d9f65 SS |
258 | /* Let NEWLINE (^J) terminate the search for people who don't like |
259 | using ESC. ^M can still be used to terminate the search and | |
260 | immediately execute the command. */ | |
261 | if (c == ESC || c == NEWLINE) | |
c862e87b JM |
262 | #else |
263 | /* The characters in isearch_terminators (set from the user-settable | |
264 | variable isearch-terminators) are used to terminate the search but | |
265 | not subsequently execute the character as a command. The default | |
266 | value is "\033\012" (ESC and C-J). */ | |
267 | if (strchr (isearch_terminators, c)) | |
268 | #endif | |
d60d9f65 SS |
269 | { |
270 | /* ESC still terminates the search, but if there is pending | |
271 | input or if input arrives within 0.1 seconds (on systems | |
272 | with select(2)) it is used as a prefix character | |
273 | with rl_execute_next. WATCH OUT FOR THIS! This is intended | |
274 | to allow the arrow keys to be used like ^F and ^B are used | |
275 | to terminate the search and execute the movement command. */ | |
276 | if (c == ESC && _rl_input_available ()) /* XXX */ | |
277 | rl_execute_next (ESC); | |
278 | break; | |
279 | } | |
280 | ||
281 | if (c >= 0 && (CTRL_CHAR (c) || META_CHAR (c) || c == RUBOUT) && c != CTRL ('G')) | |
282 | { | |
283 | rl_execute_next (c); | |
284 | break; | |
285 | } | |
286 | ||
287 | switch (c) | |
288 | { | |
289 | case -1: | |
290 | if (search_string_index == 0) | |
291 | continue; | |
292 | else if (reverse) | |
293 | --line_index; | |
294 | else if (line_index != sline_len) | |
295 | ++line_index; | |
296 | else | |
297 | ding (); | |
298 | break; | |
299 | ||
300 | /* switch directions */ | |
301 | case -2: | |
302 | direction = -direction; | |
303 | reverse = direction < 0; | |
304 | break; | |
305 | ||
306 | case CTRL ('G'): | |
307 | strcpy (rl_line_buffer, lines[orig_line]); | |
308 | rl_point = orig_point; | |
309 | rl_end = strlen (rl_line_buffer); | |
c862e87b | 310 | rl_restore_prompt(); |
d60d9f65 SS |
311 | rl_clear_message (); |
312 | if (allocated_line) | |
313 | free (allocated_line); | |
314 | free (lines); | |
315 | return 0; | |
316 | ||
317 | #if 0 | |
318 | /* delete character from search string. */ | |
319 | case -3: | |
320 | if (search_string_index == 0) | |
321 | ding (); | |
322 | else | |
323 | { | |
324 | search_string[--search_string_index] = '\0'; | |
325 | /* This is tricky. To do this right, we need to keep a | |
326 | stack of search positions for the current search, with | |
327 | sentinels marking the beginning and end. */ | |
328 | } | |
329 | break; | |
330 | #endif | |
331 | ||
332 | default: | |
333 | /* Add character to search string and continue search. */ | |
334 | if (search_string_index + 2 >= search_string_size) | |
335 | { | |
336 | search_string_size += 128; | |
337 | search_string = xrealloc (search_string, search_string_size); | |
338 | } | |
339 | search_string[search_string_index++] = c; | |
340 | search_string[search_string_index] = '\0'; | |
341 | break; | |
342 | } | |
343 | ||
344 | for (found = failed = 0;;) | |
345 | { | |
346 | int limit = sline_len - search_string_index + 1; | |
347 | ||
348 | /* Search the current line. */ | |
349 | while (reverse ? (line_index >= 0) : (line_index < limit)) | |
350 | { | |
351 | if (STREQN (search_string, sline + line_index, search_string_index)) | |
352 | { | |
353 | found++; | |
354 | break; | |
355 | } | |
356 | else | |
357 | line_index += direction; | |
358 | } | |
359 | if (found) | |
360 | break; | |
361 | ||
362 | /* Move to the next line, but skip new copies of the line | |
363 | we just found and lines shorter than the string we're | |
364 | searching for. */ | |
365 | do | |
366 | { | |
367 | /* Move to the next line. */ | |
368 | i += direction; | |
369 | ||
370 | /* At limit for direction? */ | |
371 | if (reverse ? (i < 0) : (i == hlen)) | |
372 | { | |
373 | failed++; | |
374 | break; | |
375 | } | |
376 | ||
377 | /* We will need these later. */ | |
378 | sline = lines[i]; | |
379 | sline_len = strlen (sline); | |
380 | } | |
381 | while ((prev_line_found && STREQ (prev_line_found, lines[i])) || | |
382 | (search_string_index > sline_len)); | |
383 | ||
384 | if (failed) | |
385 | break; | |
386 | ||
387 | /* Now set up the line for searching... */ | |
388 | line_index = reverse ? sline_len - search_string_index : 0; | |
389 | } | |
390 | ||
391 | if (failed) | |
392 | { | |
393 | /* We cannot find the search string. Ding the bell. */ | |
394 | ding (); | |
395 | i = last_found_line; | |
396 | continue; /* XXX - was break */ | |
397 | } | |
398 | ||
399 | /* We have found the search string. Just display it. But don't | |
400 | actually move there in the history list until the user accepts | |
401 | the location. */ | |
402 | if (found) | |
403 | { | |
404 | int line_len; | |
405 | ||
406 | prev_line_found = lines[i]; | |
407 | line_len = strlen (lines[i]); | |
408 | ||
409 | if (line_len >= rl_line_buffer_len) | |
410 | rl_extend_line_buffer (line_len); | |
411 | ||
412 | strcpy (rl_line_buffer, lines[i]); | |
413 | rl_point = line_index; | |
414 | rl_end = line_len; | |
415 | last_found_line = i; | |
416 | rl_display_search (search_string, reverse, (i == orig_line) ? -1 : i); | |
417 | } | |
418 | } | |
419 | ||
420 | /* The searching is over. The user may have found the string that she | |
421 | was looking for, or else she may have exited a failing search. If | |
422 | LINE_INDEX is -1, then that shows that the string searched for was | |
423 | not found. We use this to determine where to place rl_point. */ | |
424 | ||
425 | /* First put back the original state. */ | |
426 | strcpy (rl_line_buffer, lines[orig_line]); | |
427 | ||
c862e87b | 428 | rl_restore_prompt (); |
d60d9f65 SS |
429 | |
430 | /* Free the search string. */ | |
431 | free (search_string); | |
432 | ||
433 | if (last_found_line < orig_line) | |
c862e87b | 434 | rl_get_previous_history (orig_line - last_found_line, 0); |
d60d9f65 | 435 | else |
c862e87b | 436 | rl_get_next_history (last_found_line - orig_line, 0); |
d60d9f65 SS |
437 | |
438 | /* If the string was not found, put point at the end of the line. */ | |
439 | if (line_index < 0) | |
440 | line_index = strlen (rl_line_buffer); | |
441 | rl_point = line_index; | |
442 | rl_clear_message (); | |
443 | ||
444 | if (allocated_line) | |
445 | free (allocated_line); | |
446 | free (lines); | |
447 | ||
448 | return 0; | |
449 | } |