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726f6388 JA |
1 | This file is fc.def, from which is created fc.c. |
2 | It implements the builtin "fc" in Bash. | |
3 | ||
4 | Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GNU Bash, the Bourne Again SHell. | |
7 | ||
8 | Bash is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
bb70624e | 10 | Software Foundation; either version 2, or (at your option) any later |
726f6388 JA |
11 | version. |
12 | ||
13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License along | |
19 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 20 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
726f6388 JA |
21 | |
22 | $PRODUCES fc.c | |
23 | ||
24 | $BUILTIN fc | |
25 | $FUNCTION fc_builtin | |
26 | $DEPENDS_ON HISTORY | |
27 | $SHORT_DOC fc [-e ename] [-nlr] [first] [last] or fc -s [pat=rep] [cmd] | |
28 | ||
b72432fd | 29 | fc is used to list or edit and re-execute commands from the history list. |
726f6388 JA |
30 | FIRST and LAST can be numbers specifying the range, or FIRST can be a |
31 | string, which means the most recent command beginning with that | |
32 | string. | |
33 | ||
34 | -e ENAME selects which editor to use. Default is FCEDIT, then EDITOR, | |
b72432fd | 35 | then vi. |
726f6388 JA |
36 | |
37 | -l means list lines instead of editing. | |
38 | -n means no line numbers listed. | |
39 | -r means reverse the order of the lines (making it newest listed first). | |
40 | ||
41 | With the `fc -s [pat=rep ...] [command]' format, the command is | |
42 | re-executed after the substitution OLD=NEW is performed. | |
43 | ||
44 | A useful alias to use with this is r='fc -s', so that typing `r cc' | |
45 | runs the last command beginning with `cc' and typing `r' re-executes | |
46 | the last command. | |
47 | $END | |
48 | ||
ccc6cda3 JA |
49 | #include <config.h> |
50 | ||
726f6388 | 51 | #if defined (HISTORY) |
cce855bc JA |
52 | #ifndef _MINIX |
53 | # include <sys/param.h> | |
54 | #endif | |
d166f048 | 55 | #include "../bashtypes.h" |
bb70624e | 56 | #include "posixstat.h" |
cce855bc JA |
57 | #ifndef _MINIX |
58 | # include <sys/file.h> | |
59 | #endif | |
ccc6cda3 JA |
60 | |
61 | #if defined (HAVE_UNISTD_H) | |
62 | # include <unistd.h> | |
63 | #endif | |
64 | ||
65 | #include <stdio.h> | |
66 | ||
67 | #include "../bashansi.h" | |
726f6388 | 68 | #include <errno.h> |
ccc6cda3 JA |
69 | |
70 | #include "../shell.h" | |
726f6388 JA |
71 | #include "../builtins.h" |
72 | #include "../flags.h" | |
726f6388 | 73 | #include "../bashhist.h" |
bb70624e | 74 | #include "maxpath.h" |
726f6388 JA |
75 | #include <readline/history.h> |
76 | #include "bashgetopt.h" | |
ccc6cda3 | 77 | #include "common.h" |
726f6388 | 78 | |
726f6388 JA |
79 | #if !defined (errno) |
80 | extern int errno; | |
81 | #endif /* !errno */ | |
82 | ||
83 | extern int echo_input_at_read; | |
d166f048 JA |
84 | extern int current_command_line_count; |
85 | extern int literal_history; | |
726f6388 JA |
86 | |
87 | extern int unlink (); | |
88 | ||
28ef6c31 | 89 | extern FILE *sh_mktmpfp __P((char *, int, char **)); |
d166f048 | 90 | |
726f6388 JA |
91 | /* **************************************************************** */ |
92 | /* */ | |
93 | /* The K*rn shell style fc command (Fix Command) */ | |
94 | /* */ | |
95 | /* **************************************************************** */ | |
96 | ||
97 | /* fc builtin command (fix command) for Bash for those who | |
98 | like K*rn-style history better than csh-style. | |
99 | ||
100 | fc [-e ename] [-nlr] [first] [last] | |
101 | ||
102 | FIRST and LAST can be numbers specifying the range, or FIRST can be | |
103 | a string, which means the most recent command beginning with that | |
104 | string. | |
105 | ||
106 | -e ENAME selects which editor to use. Default is FCEDIT, then EDITOR, | |
107 | then the editor which corresponds to the current readline editing | |
108 | mode, then vi. | |
109 | ||
110 | -l means list lines instead of editing. | |
111 | -n means no line numbers listed. | |
112 | -r means reverse the order of the lines (making it newest listed first). | |
113 | ||
114 | fc -e - [pat=rep ...] [command] | |
115 | fc -s [pat=rep ...] [command] | |
116 | ||
117 | Equivalent to !command:sg/pat/rep execpt there can be multiple PAT=REP's. | |
118 | */ | |
119 | ||
ccc6cda3 JA |
120 | static char *fc_dosubs (), *fc_gethist (), *fc_readline (); |
121 | static int fc_gethnum (), fc_number (); | |
726f6388 JA |
122 | static void fc_replhist (), fc_addhist (); |
123 | ||
124 | /* Data structure describing a list of global replacements to perform. */ | |
125 | typedef struct repl { | |
126 | struct repl *next; | |
127 | char *pat; | |
128 | char *rep; | |
129 | } REPL; | |
130 | ||
726f6388 JA |
131 | /* Accessors for HIST_ENTRY lists that are called HLIST. */ |
132 | #define histline(i) (hlist[(i)]->line) | |
133 | #define histdata(i) (hlist[(i)]->data) | |
134 | ||
135 | #define FREE_RLIST() \ | |
136 | do { \ | |
137 | for (rl = rlist; rl; ) { \ | |
138 | REPL *r; \ | |
139 | r = rl->next; \ | |
140 | if (rl->pat) \ | |
141 | free (rl->pat); \ | |
142 | if (rl->rep) \ | |
143 | free (rl->rep); \ | |
144 | free (rl); \ | |
145 | rl = r; \ | |
146 | } \ | |
147 | } while (0) | |
148 | ||
149 | /* String to execute on a file that we want to edit. */ | |
150 | #define FC_EDIT_COMMAND "${FCEDIT:-${EDITOR:-vi}}" | |
151 | ||
152 | int | |
153 | fc_builtin (list) | |
154 | WORD_LIST *list; | |
155 | { | |
156 | register int i; | |
157 | register char *sep; | |
158 | int numbering, reverse, listing, execute; | |
b72432fd | 159 | int histbeg, histend, last_hist, retval, opt; |
726f6388 | 160 | FILE *stream; |
ccc6cda3 JA |
161 | REPL *rlist, *rl; |
162 | char *ename, *command, *newcom, *line; | |
726f6388 | 163 | HIST_ENTRY **hlist; |
28ef6c31 | 164 | char *fn; |
726f6388 JA |
165 | |
166 | numbering = 1; | |
167 | reverse = listing = execute = 0; | |
ccc6cda3 | 168 | ename = (char *)NULL; |
726f6388 JA |
169 | |
170 | /* Parse out the options and set which of the two forms we're in. */ | |
ccc6cda3 JA |
171 | reset_internal_getopt (); |
172 | lcurrent = list; /* XXX */ | |
173 | while (fc_number (loptend = lcurrent) == 0 && | |
174 | (opt = internal_getopt (list, ":e:lnrs")) != -1) | |
726f6388 | 175 | { |
ccc6cda3 JA |
176 | switch (opt) |
177 | { | |
178 | case 'n': | |
179 | numbering = 0; | |
180 | break; | |
726f6388 | 181 | |
ccc6cda3 JA |
182 | case 'l': |
183 | listing = 1; | |
184 | break; | |
726f6388 | 185 | |
ccc6cda3 JA |
186 | case 'r': |
187 | reverse = 1; | |
188 | break; | |
189 | ||
190 | case 's': | |
191 | execute = 1; | |
192 | break; | |
193 | ||
194 | case 'e': | |
195 | ename = list_optarg; | |
196 | break; | |
197 | ||
198 | default: | |
199 | builtin_usage (); | |
200 | return (EX_USAGE); | |
726f6388 | 201 | } |
726f6388 JA |
202 | } |
203 | ||
ccc6cda3 JA |
204 | list = loptend; |
205 | ||
726f6388 JA |
206 | if (ename && (*ename == '-') && (ename[1] == '\0')) |
207 | execute = 1; | |
208 | ||
209 | /* The "execute" form of the command (re-run, with possible string | |
210 | substitutions). */ | |
211 | if (execute) | |
212 | { | |
ccc6cda3 | 213 | rlist = (REPL *)NULL; |
726f6388 JA |
214 | while (list && ((sep = (char *)strchr (list->word->word, '=')) != NULL)) |
215 | { | |
216 | *sep++ = '\0'; | |
217 | rl = (REPL *)xmalloc (sizeof (REPL)); | |
218 | rl->next = (REPL *)NULL; | |
219 | rl->pat = savestring (list->word->word); | |
220 | rl->rep = savestring (sep); | |
221 | ||
222 | if (rlist == NULL) | |
223 | rlist = rl; | |
224 | else | |
225 | { | |
226 | rl->next = rlist; | |
227 | rlist = rl; | |
228 | } | |
229 | list = list->next; | |
230 | } | |
231 | ||
232 | /* If we have a list of substitutions to do, then reverse it | |
233 | to get the replacements in the proper order. */ | |
234 | ||
235 | if (rlist && rlist->next) | |
ccc6cda3 | 236 | rlist = (REPL *)reverse_list ((GENERIC_LIST *) rlist); |
726f6388 JA |
237 | |
238 | hlist = history_list (); | |
239 | ||
240 | /* If we still have something in list, it is a command spec. | |
241 | Otherwise, we use the most recent command in time. */ | |
ccc6cda3 | 242 | command = fc_gethist (list ? list->word->word : (char *)NULL, hlist); |
726f6388 JA |
243 | |
244 | if (command == NULL) | |
245 | { | |
246 | builtin_error ("no command found"); | |
247 | if (rlist) | |
248 | FREE_RLIST (); | |
249 | ||
250 | return (EXECUTION_FAILURE); | |
251 | } | |
252 | ||
253 | if (rlist) | |
254 | { | |
255 | newcom = fc_dosubs (command, rlist); | |
256 | free (command); | |
257 | FREE_RLIST (); | |
258 | command = newcom; | |
259 | } | |
260 | ||
ccc6cda3 JA |
261 | fprintf (stderr, "%s\n", command); |
262 | fc_replhist (command); /* replace `fc -s' with command */ | |
d166f048 | 263 | return (parse_and_execute (command, "fc", SEVAL_NOHIST)); |
726f6388 JA |
264 | } |
265 | ||
266 | /* This is the second form of the command (the list-or-edit-and-rerun | |
267 | form). */ | |
268 | hlist = history_list (); | |
269 | if (hlist == 0) | |
270 | return (EXECUTION_SUCCESS); | |
271 | for (i = 0; hlist[i]; i++); | |
272 | ||
273 | /* With the Bash implementation of history, the current command line | |
274 | ("fc blah..." and so on) is already part of the history list by | |
275 | the time we get to this point. This just skips over that command | |
276 | and makes the last command that this deals with be the last command | |
d166f048 JA |
277 | the user entered before the fc. We need to check whether the |
278 | line was actually added (HISTIGNORE may have caused it to not be), | |
279 | so we check hist_last_line_added. */ | |
726f6388 | 280 | |
d166f048 | 281 | last_hist = i - 1 - hist_last_line_added; |
726f6388 JA |
282 | |
283 | if (list) | |
284 | { | |
285 | histbeg = fc_gethnum (list->word->word, hlist); | |
286 | list = list->next; | |
287 | ||
288 | if (list) | |
289 | histend = fc_gethnum (list->word->word, hlist); | |
290 | else | |
ccc6cda3 | 291 | histend = listing ? last_hist : histbeg; |
726f6388 JA |
292 | } |
293 | else | |
294 | { | |
295 | /* The default for listing is the last 16 history items. */ | |
296 | if (listing) | |
297 | { | |
298 | histend = last_hist; | |
299 | histbeg = histend - 16; | |
300 | if (histbeg < 0) | |
301 | histbeg = 0; | |
302 | } | |
303 | else | |
ccc6cda3 JA |
304 | /* For editing, it is the last history command. */ |
305 | histbeg = histend = last_hist; | |
726f6388 JA |
306 | } |
307 | ||
308 | /* We print error messages for line specifications out of range. */ | |
309 | if ((histbeg < 0) || (histend < 0) || | |
310 | (histbeg > last_hist) || (histend > last_hist)) | |
311 | { | |
312 | builtin_error ("history specification out of range"); | |
313 | return (EXECUTION_FAILURE); | |
314 | } | |
315 | ||
316 | if (histend < histbeg) | |
317 | { | |
ccc6cda3 | 318 | i = histend; |
726f6388 | 319 | histend = histbeg; |
ccc6cda3 JA |
320 | histbeg = i; |
321 | ||
726f6388 JA |
322 | reverse = 1; |
323 | } | |
324 | ||
325 | if (listing) | |
326 | stream = stdout; | |
327 | else | |
328 | { | |
329 | numbering = 0; | |
28ef6c31 | 330 | stream = sh_mktmpfp ("bash-fc", MT_USERANDOM|MT_USETMPDIR, &fn); |
ccc6cda3 | 331 | if (stream == 0) |
726f6388 | 332 | { |
28ef6c31 JA |
333 | builtin_error ("cannot open temp file %s", fn ? fn : ""); |
334 | FREE (fn); | |
726f6388 JA |
335 | return (EXECUTION_FAILURE); |
336 | } | |
337 | } | |
338 | ||
ccc6cda3 | 339 | for (i = reverse ? histend : histbeg; reverse ? i >= histbeg : i <= histend; reverse ? i-- : i++) |
726f6388 | 340 | { |
ccc6cda3 JA |
341 | QUIT; |
342 | if (numbering) | |
343 | fprintf (stream, "%d", i + history_base); | |
344 | if (listing) | |
345 | fprintf (stream, "\t%c", histdata (i) ? '*' : ' '); | |
346 | fprintf (stream, "%s\n", histline (i)); | |
726f6388 JA |
347 | } |
348 | ||
349 | if (listing) | |
350 | return (EXECUTION_SUCCESS); | |
351 | ||
352 | fclose (stream); | |
353 | ||
354 | /* Now edit the file of commands. */ | |
355 | if (ename) | |
356 | { | |
357 | command = (char *)xmalloc (strlen (ename) + strlen (fn) + 2); | |
358 | sprintf (command, "%s %s", ename, fn); | |
359 | } | |
360 | else | |
361 | { | |
362 | command = (char *)xmalloc (3 + strlen (FC_EDIT_COMMAND) + strlen (fn)); | |
363 | sprintf (command, "%s %s", FC_EDIT_COMMAND, fn); | |
364 | } | |
d166f048 | 365 | retval = parse_and_execute (command, "fc", SEVAL_NOHIST); |
ccc6cda3 JA |
366 | if (retval != EXECUTION_SUCCESS) |
367 | { | |
368 | unlink (fn); | |
28ef6c31 | 369 | free (fn); |
ccc6cda3 JA |
370 | return (EXECUTION_FAILURE); |
371 | } | |
726f6388 | 372 | |
d166f048 JA |
373 | /* Make sure parse_and_execute doesn't turn this off, even though a |
374 | call to parse_and_execute farther up the function call stack (e.g., | |
375 | if this is called by vi_edit_and_execute_command) may have already | |
376 | called bash_history_disable. */ | |
377 | remember_on_history = 1; | |
726f6388 | 378 | |
d166f048 | 379 | /* Turn on the `v' flag while fc_execute_file runs so the commands |
726f6388 JA |
380 | will be echoed as they are read by the parser. */ |
381 | begin_unwind_frame ("fc builtin"); | |
28ef6c31 | 382 | add_unwind_protect ((Function *)xfree, fn); |
726f6388 JA |
383 | add_unwind_protect (unlink, fn); |
384 | unwind_protect_int (echo_input_at_read); | |
385 | echo_input_at_read = 1; | |
386 | ||
d166f048 | 387 | retval = fc_execute_file (fn); |
726f6388 JA |
388 | |
389 | run_unwind_frame ("fc builtin"); | |
390 | ||
391 | return (retval); | |
392 | } | |
393 | ||
ccc6cda3 JA |
394 | /* Return 1 if LIST->word->word is a legal number for fc's use. */ |
395 | static int | |
396 | fc_number (list) | |
397 | WORD_LIST *list; | |
398 | { | |
399 | char *s; | |
400 | ||
401 | if (list == 0) | |
402 | return 0; | |
403 | s = list->word->word; | |
404 | if (*s == '-') | |
405 | s++; | |
406 | return (legal_number (s, (long *)NULL)); | |
407 | } | |
408 | ||
726f6388 JA |
409 | /* Return an absolute index into HLIST which corresponds to COMMAND. If |
410 | COMMAND is a number, then it was specified in relative terms. If it | |
411 | is a string, then it is the start of a command line present in HLIST. */ | |
412 | static int | |
413 | fc_gethnum (command, hlist) | |
414 | char *command; | |
415 | HIST_ENTRY **hlist; | |
416 | { | |
417 | int sign = 1, n, clen; | |
418 | register int i, j; | |
419 | register char *s; | |
420 | ||
421 | /* Count history elements. */ | |
422 | for (i = 0; hlist[i]; i++); | |
423 | ||
424 | /* With the Bash implementation of history, the current command line | |
425 | ("fc blah..." and so on) is already part of the history list by | |
426 | the time we get to this point. This just skips over that command | |
427 | and makes the last command that this deals with be the last command | |
d166f048 JA |
428 | the user entered before the fc. We need to check whether the |
429 | line was actually added (HISTIGNORE may have caused it to not be), | |
430 | so we check hist_last_line_added. */ | |
431 | i -= 1 + hist_last_line_added; | |
726f6388 JA |
432 | |
433 | /* No specification defaults to most recent command. */ | |
434 | if (command == NULL) | |
435 | return (i); | |
436 | ||
437 | /* Otherwise, there is a specification. It can be a number relative to | |
438 | the current position, or an absolute history number. */ | |
439 | s = command; | |
440 | ||
441 | /* Handle possible leading minus sign. */ | |
442 | if (s && (*s == '-')) | |
443 | { | |
444 | sign = -1; | |
445 | s++; | |
446 | } | |
447 | ||
448 | if (s && digit(*s)) | |
449 | { | |
450 | n = atoi (s); | |
451 | n *= sign; | |
452 | ||
453 | /* Anything specified greater than the last history element that we | |
454 | deal with is an error. */ | |
455 | if (n > i + history_base) | |
456 | return (-1); | |
457 | ||
458 | /* If the value is negative or zero, then it is an offset from | |
459 | the current history item. */ | |
460 | if (n < 0) | |
461 | return (i + n + 1); | |
462 | else if (n == 0) | |
463 | return (i); | |
464 | else | |
465 | return (n - history_base); | |
466 | } | |
467 | ||
468 | clen = strlen (command); | |
469 | for (j = i; j >= 0; j--) | |
470 | { | |
471 | if (STREQN (command, histline (j), clen)) | |
472 | return (j); | |
473 | } | |
474 | return (-1); | |
475 | } | |
476 | ||
477 | /* Locate the most recent history line which begins with | |
478 | COMMAND in HLIST, and return a malloc()'ed copy of it. */ | |
479 | static char * | |
480 | fc_gethist (command, hlist) | |
481 | char *command; | |
482 | HIST_ENTRY **hlist; | |
483 | { | |
484 | int i; | |
485 | ||
486 | if (!hlist) | |
487 | return ((char *)NULL); | |
488 | ||
489 | i = fc_gethnum (command, hlist); | |
490 | ||
491 | if (i >= 0) | |
492 | return (savestring (histline (i))); | |
493 | else | |
494 | return ((char *)NULL); | |
495 | } | |
496 | ||
497 | /* Read the edited history lines from STREAM and return them | |
498 | one at a time. This can read unlimited length lines. The | |
499 | caller should free the storage. */ | |
500 | static char * | |
501 | fc_readline (stream) | |
502 | FILE *stream; | |
503 | { | |
504 | register int c; | |
505 | int line_len = 0, lindex = 0; | |
506 | char *line = (char *)NULL; | |
507 | ||
508 | while ((c = getc (stream)) != EOF) | |
509 | { | |
510 | if ((lindex + 2) >= line_len) | |
511 | line = (char *) xrealloc (line, (line_len += 128)); | |
512 | ||
513 | if (c == '\n') | |
514 | { | |
515 | line[lindex++] = '\n'; | |
516 | line[lindex++] = '\0'; | |
517 | return (line); | |
518 | } | |
519 | else | |
520 | line[lindex++] = c; | |
521 | } | |
522 | ||
523 | if (!lindex) | |
524 | { | |
525 | if (line) | |
526 | free (line); | |
527 | ||
528 | return ((char *)NULL); | |
529 | } | |
530 | ||
531 | if (lindex + 2 >= line_len) | |
532 | line = (char *)xrealloc (line, lindex + 3); | |
533 | ||
534 | line[lindex++] = '\n'; /* Finish with newline if none in file */ | |
535 | line[lindex++] = '\0'; | |
536 | return (line); | |
537 | } | |
538 | ||
539 | /* Perform the SUBS on COMMAND. | |
540 | SUBS is a list of substitutions, and COMMAND is a simple string. | |
541 | Return a pointer to a malloc'ed string which contains the substituted | |
542 | command. */ | |
543 | static char * | |
544 | fc_dosubs (command, subs) | |
545 | char *command; | |
546 | REPL *subs; | |
547 | { | |
ccc6cda3 | 548 | register char *new, *t; |
726f6388 JA |
549 | register REPL *r; |
550 | ||
ccc6cda3 | 551 | for (new = savestring (command), r = subs; r; r = r->next) |
726f6388 | 552 | { |
ccc6cda3 | 553 | t = strsub (new, r->pat, r->rep, 1); |
726f6388 JA |
554 | free (new); |
555 | new = t; | |
556 | } | |
557 | return (new); | |
558 | } | |
559 | ||
726f6388 JA |
560 | /* Use `command' to replace the last entry in the history list, which, |
561 | by this time, is `fc blah...'. The intent is that the new command | |
562 | become the history entry, and that `fc' should never appear in the | |
563 | history list. This way you can do `r' to your heart's content. */ | |
564 | static void | |
565 | fc_replhist (command) | |
566 | char *command; | |
567 | { | |
568 | register int i; | |
569 | HIST_ENTRY **hlist, *histent, *discard; | |
726f6388 JA |
570 | int n; |
571 | ||
ccc6cda3 | 572 | if (command == 0 || *command == '\0') |
726f6388 JA |
573 | return; |
574 | ||
575 | hlist = history_list (); | |
576 | ||
577 | if (hlist == NULL) | |
578 | return; | |
579 | ||
580 | for (i = 0; hlist[i]; i++); | |
581 | i--; | |
582 | ||
583 | /* History_get () takes a parameter that should be | |
584 | offset by history_base. */ | |
585 | ||
586 | histent = history_get (history_base + i); /* Don't free this */ | |
587 | if (histent == NULL) | |
588 | return; | |
589 | ||
590 | n = strlen (command); | |
591 | ||
592 | if (command[n - 1] == '\n') | |
593 | command[n - 1] = '\0'; | |
594 | ||
595 | if (command && *command) | |
596 | { | |
597 | discard = remove_history (i); | |
598 | if (discard) | |
599 | { | |
ccc6cda3 | 600 | FREE (discard->line); |
726f6388 JA |
601 | free ((char *) discard); |
602 | } | |
603 | maybe_add_history (command); /* Obeys HISTCONTROL setting. */ | |
604 | } | |
605 | } | |
606 | ||
607 | /* Add LINE to the history, after removing a single trailing newline. */ | |
608 | static void | |
609 | fc_addhist (line) | |
610 | char *line; | |
611 | { | |
612 | register int n; | |
613 | ||
614 | n = strlen (line); | |
615 | ||
616 | if (line[n - 1] == '\n') | |
617 | line[n - 1] = '\0'; | |
618 | ||
619 | if (line && *line) | |
620 | maybe_add_history (line); | |
621 | } | |
622 | #endif /* HISTORY */ |