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d60d9f65 SS |
1 | /* readline.c -- a general facility for reading lines of input |
2 | with emacs style editing and completion. */ | |
3 | ||
37905921 | 4 | /* Copyright (C) 1987-2012 Free Software Foundation, Inc. |
d60d9f65 | 5 | |
cc88a640 JK |
6 | This file is part of the GNU Readline Library (Readline), a library |
7 | for reading lines of text with interactive input and history editing. | |
d60d9f65 | 8 | |
cc88a640 JK |
9 | Readline 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 3 of the License, or | |
d60d9f65 SS |
12 | (at your option) any later version. |
13 | ||
cc88a640 JK |
14 | Readline is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
d60d9f65 SS |
17 | GNU General Public License for more details. |
18 | ||
cc88a640 JK |
19 | You should have received a copy of the GNU General Public License |
20 | along with Readline. If not, see <http://www.gnu.org/licenses/>. | |
21 | */ | |
22 | ||
d60d9f65 SS |
23 | #define READLINE_LIBRARY |
24 | ||
25 | #if defined (HAVE_CONFIG_H) | |
26 | # include <config.h> | |
27 | #endif | |
28 | ||
29 | #include <sys/types.h> | |
30 | ||
31 | #if defined (HAVE_UNISTD_H) | |
32 | # include <unistd.h> /* for _POSIX_VERSION */ | |
33 | #endif /* HAVE_UNISTD_H */ | |
34 | ||
35 | #if defined (HAVE_STDLIB_H) | |
36 | # include <stdlib.h> | |
37 | #else | |
38 | # include "ansi_stdlib.h" | |
39 | #endif /* HAVE_STDLIB_H */ | |
40 | ||
41 | #include <stdio.h> | |
42 | ||
43 | /* System-specific feature definitions and include files. */ | |
44 | #include "rldefs.h" | |
45 | ||
46 | /* Some standard library routines. */ | |
47 | #include "readline.h" | |
48 | #include "history.h" | |
49 | ||
1b17e766 | 50 | #include "rlprivate.h" |
9255ee31 | 51 | #include "xmalloc.h" |
d60d9f65 | 52 | |
cc88a640 JK |
53 | extern void replace_history_data PARAMS((int, histdata_t *, histdata_t *)); |
54 | ||
d60d9f65 SS |
55 | /* Non-zero tells rl_delete_text and rl_insert_text to not add to |
56 | the undo list. */ | |
57 | int _rl_doing_an_undo = 0; | |
58 | ||
59 | /* How many unclosed undo groups we currently have. */ | |
60 | int _rl_undo_group_level = 0; | |
61 | ||
62 | /* The current undo list for THE_LINE. */ | |
63 | UNDO_LIST *rl_undo_list = (UNDO_LIST *)NULL; | |
64 | ||
65 | /* **************************************************************** */ | |
66 | /* */ | |
67 | /* Undo, and Undoing */ | |
68 | /* */ | |
69 | /* **************************************************************** */ | |
70 | ||
cc88a640 JK |
71 | static UNDO_LIST * |
72 | alloc_undo_entry (what, start, end, text) | |
d60d9f65 SS |
73 | enum undo_code what; |
74 | int start, end; | |
75 | char *text; | |
76 | { | |
cc88a640 JK |
77 | UNDO_LIST *temp; |
78 | ||
79 | temp = (UNDO_LIST *)xmalloc (sizeof (UNDO_LIST)); | |
d60d9f65 SS |
80 | temp->what = what; |
81 | temp->start = start; | |
82 | temp->end = end; | |
83 | temp->text = text; | |
cc88a640 JK |
84 | |
85 | temp->next = (UNDO_LIST *)NULL; | |
86 | return temp; | |
87 | } | |
88 | ||
89 | /* Remember how to undo something. Concatenate some undos if that | |
90 | seems right. */ | |
91 | void | |
92 | rl_add_undo (what, start, end, text) | |
93 | enum undo_code what; | |
94 | int start, end; | |
95 | char *text; | |
96 | { | |
97 | UNDO_LIST *temp; | |
98 | ||
99 | temp = alloc_undo_entry (what, start, end, text); | |
d60d9f65 SS |
100 | temp->next = rl_undo_list; |
101 | rl_undo_list = temp; | |
102 | } | |
103 | ||
37905921 | 104 | /* Free an UNDO_LIST */ |
d60d9f65 | 105 | void |
37905921 PP |
106 | _rl_free_undo_list (ul) |
107 | UNDO_LIST *ul; | |
d60d9f65 | 108 | { |
37905921 | 109 | UNDO_LIST *release; |
cc88a640 | 110 | |
37905921 | 111 | while (ul) |
d60d9f65 | 112 | { |
37905921 PP |
113 | release = ul; |
114 | ul = ul->next; | |
d60d9f65 SS |
115 | |
116 | if (release->what == UNDO_DELETE) | |
cc88a640 | 117 | xfree (release->text); |
d60d9f65 | 118 | |
cc88a640 | 119 | xfree (release); |
d60d9f65 | 120 | } |
37905921 PP |
121 | } |
122 | ||
123 | /* Free the existing undo list. */ | |
124 | void | |
125 | rl_free_undo_list () | |
126 | { | |
127 | UNDO_LIST *release, *orig_list; | |
128 | ||
129 | orig_list = rl_undo_list; | |
130 | _rl_free_undo_list (rl_undo_list); | |
d60d9f65 | 131 | rl_undo_list = (UNDO_LIST *)NULL; |
cc88a640 JK |
132 | replace_history_data (-1, (histdata_t *)orig_list, (histdata_t *)NULL); |
133 | } | |
134 | ||
135 | UNDO_LIST * | |
136 | _rl_copy_undo_entry (entry) | |
137 | UNDO_LIST *entry; | |
138 | { | |
139 | UNDO_LIST *new; | |
140 | ||
141 | new = alloc_undo_entry (entry->what, entry->start, entry->end, (char *)NULL); | |
142 | new->text = entry->text ? savestring (entry->text) : 0; | |
143 | return new; | |
144 | } | |
145 | ||
146 | UNDO_LIST * | |
147 | _rl_copy_undo_list (head) | |
148 | UNDO_LIST *head; | |
149 | { | |
150 | UNDO_LIST *list, *new, *roving, *c; | |
151 | ||
152 | if (head == 0) | |
153 | return head; | |
154 | ||
155 | list = head; | |
156 | new = 0; | |
157 | while (list) | |
158 | { | |
159 | c = _rl_copy_undo_entry (list); | |
160 | if (new == 0) | |
161 | roving = new = c; | |
162 | else | |
163 | { | |
164 | roving->next = c; | |
165 | roving = roving->next; | |
166 | } | |
167 | list = list->next; | |
168 | } | |
169 | ||
170 | roving->next = 0; | |
171 | return new; | |
d60d9f65 SS |
172 | } |
173 | ||
174 | /* Undo the next thing in the list. Return 0 if there | |
175 | is nothing to undo, or non-zero if there was. */ | |
176 | int | |
177 | rl_do_undo () | |
178 | { | |
179 | UNDO_LIST *release; | |
9255ee31 | 180 | int waiting_for_begin, start, end; |
37905921 | 181 | HIST_ENTRY *cur, *temp; |
d60d9f65 SS |
182 | |
183 | #define TRANS(i) ((i) == -1 ? rl_point : ((i) == -2 ? rl_end : (i))) | |
184 | ||
9255ee31 | 185 | start = end = waiting_for_begin = 0; |
d60d9f65 SS |
186 | do |
187 | { | |
cc88a640 | 188 | if (rl_undo_list == 0) |
d60d9f65 SS |
189 | return (0); |
190 | ||
191 | _rl_doing_an_undo = 1; | |
9255ee31 | 192 | RL_SETSTATE(RL_STATE_UNDOING); |
d60d9f65 SS |
193 | |
194 | /* To better support vi-mode, a start or end value of -1 means | |
195 | rl_point, and a value of -2 means rl_end. */ | |
196 | if (rl_undo_list->what == UNDO_DELETE || rl_undo_list->what == UNDO_INSERT) | |
197 | { | |
198 | start = TRANS (rl_undo_list->start); | |
199 | end = TRANS (rl_undo_list->end); | |
200 | } | |
201 | ||
202 | switch (rl_undo_list->what) | |
203 | { | |
204 | /* Undoing deletes means inserting some text. */ | |
205 | case UNDO_DELETE: | |
206 | rl_point = start; | |
207 | rl_insert_text (rl_undo_list->text); | |
cc88a640 | 208 | xfree (rl_undo_list->text); |
d60d9f65 SS |
209 | break; |
210 | ||
211 | /* Undoing inserts means deleting some text. */ | |
212 | case UNDO_INSERT: | |
213 | rl_delete_text (start, end); | |
214 | rl_point = start; | |
215 | break; | |
216 | ||
217 | /* Undoing an END means undoing everything 'til we get to a BEGIN. */ | |
218 | case UNDO_END: | |
219 | waiting_for_begin++; | |
220 | break; | |
221 | ||
222 | /* Undoing a BEGIN means that we are done with this group. */ | |
223 | case UNDO_BEGIN: | |
224 | if (waiting_for_begin) | |
225 | waiting_for_begin--; | |
226 | else | |
9255ee31 | 227 | rl_ding (); |
d60d9f65 SS |
228 | break; |
229 | } | |
230 | ||
231 | _rl_doing_an_undo = 0; | |
9255ee31 | 232 | RL_UNSETSTATE(RL_STATE_UNDOING); |
d60d9f65 SS |
233 | |
234 | release = rl_undo_list; | |
235 | rl_undo_list = rl_undo_list->next; | |
37905921 PP |
236 | |
237 | /* If we are editing a history entry, make sure the change is replicated | |
238 | in the history entry's line */ | |
239 | cur = current_history (); | |
240 | if (cur && cur->data && (UNDO_LIST *)cur->data == release) | |
241 | { | |
242 | temp = replace_history_entry (where_history (), rl_line_buffer, (histdata_t)rl_undo_list); | |
243 | xfree (temp->line); | |
244 | FREE (temp->timestamp); | |
245 | xfree (temp); | |
246 | } | |
247 | ||
cc88a640 JK |
248 | replace_history_data (-1, (histdata_t *)release, (histdata_t *)rl_undo_list); |
249 | ||
250 | xfree (release); | |
d60d9f65 SS |
251 | } |
252 | while (waiting_for_begin); | |
253 | ||
254 | return (1); | |
255 | } | |
256 | #undef TRANS | |
257 | ||
258 | int | |
259 | _rl_fix_last_undo_of_type (type, start, end) | |
260 | int type, start, end; | |
261 | { | |
262 | UNDO_LIST *rl; | |
263 | ||
264 | for (rl = rl_undo_list; rl; rl = rl->next) | |
265 | { | |
266 | if (rl->what == type) | |
267 | { | |
268 | rl->start = start; | |
269 | rl->end = end; | |
270 | return 0; | |
271 | } | |
272 | } | |
273 | return 1; | |
274 | } | |
275 | ||
276 | /* Begin a group. Subsequent undos are undone as an atomic operation. */ | |
277 | int | |
278 | rl_begin_undo_group () | |
279 | { | |
280 | rl_add_undo (UNDO_BEGIN, 0, 0, 0); | |
281 | _rl_undo_group_level++; | |
282 | return 0; | |
283 | } | |
284 | ||
285 | /* End an undo group started with rl_begin_undo_group (). */ | |
286 | int | |
287 | rl_end_undo_group () | |
288 | { | |
289 | rl_add_undo (UNDO_END, 0, 0, 0); | |
290 | _rl_undo_group_level--; | |
291 | return 0; | |
292 | } | |
293 | ||
294 | /* Save an undo entry for the text from START to END. */ | |
295 | int | |
296 | rl_modifying (start, end) | |
297 | int start, end; | |
298 | { | |
299 | if (start > end) | |
300 | { | |
301 | SWAP (start, end); | |
302 | } | |
303 | ||
304 | if (start != end) | |
305 | { | |
306 | char *temp = rl_copy_text (start, end); | |
307 | rl_begin_undo_group (); | |
308 | rl_add_undo (UNDO_DELETE, start, end, temp); | |
309 | rl_add_undo (UNDO_INSERT, start, end, (char *)NULL); | |
310 | rl_end_undo_group (); | |
311 | } | |
312 | return 0; | |
313 | } | |
314 | ||
315 | /* Revert the current line to its previous state. */ | |
316 | int | |
317 | rl_revert_line (count, key) | |
318 | int count, key; | |
319 | { | |
cc88a640 | 320 | if (rl_undo_list == 0) |
9255ee31 | 321 | rl_ding (); |
d60d9f65 SS |
322 | else |
323 | { | |
324 | while (rl_undo_list) | |
325 | rl_do_undo (); | |
5bdf8622 DJ |
326 | #if defined (VI_MODE) |
327 | if (rl_editing_mode == vi_mode) | |
328 | rl_point = rl_mark = 0; /* rl_end should be set correctly */ | |
329 | #endif | |
d60d9f65 | 330 | } |
5bdf8622 | 331 | |
d60d9f65 SS |
332 | return 0; |
333 | } | |
334 | ||
335 | /* Do some undoing of things that were done. */ | |
336 | int | |
337 | rl_undo_command (count, key) | |
338 | int count, key; | |
339 | { | |
340 | if (count < 0) | |
341 | return 0; /* Nothing to do. */ | |
342 | ||
343 | while (count) | |
344 | { | |
345 | if (rl_do_undo ()) | |
346 | count--; | |
347 | else | |
348 | { | |
9255ee31 | 349 | rl_ding (); |
d60d9f65 SS |
350 | break; |
351 | } | |
352 | } | |
353 | return 0; | |
354 | } |