]> CyberLeo.Net >> Repos - FreeBSD/releng/9.2.git/blob - bin/sh/histedit.c
- Copy stable/9 to releng/9.2 as part of the 9.2-RELEASE cycle.
[FreeBSD/releng/9.2.git] / bin / sh / histedit.c
1 /*-
2  * Copyright (c) 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Kenneth Almquist.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 4. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)histedit.c  8.2 (Berkeley) 5/4/95";
36 #endif
37 #endif /* not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 #include <sys/param.h>
42 #include <limits.h>
43 #include <paths.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <unistd.h>
47 /*
48  * Editline and history functions (and glue).
49  */
50 #include "shell.h"
51 #include "parser.h"
52 #include "var.h"
53 #include "options.h"
54 #include "main.h"
55 #include "output.h"
56 #include "mystring.h"
57 #ifndef NO_HISTORY
58 #include "myhistedit.h"
59 #include "error.h"
60 #include "eval.h"
61 #include "memalloc.h"
62 #include "builtins.h"
63
64 #define MAXHISTLOOPS    4       /* max recursions through fc */
65 #define DEFEDITOR       "ed"    /* default editor *should* be $EDITOR */
66
67 History *hist;  /* history cookie */
68 EditLine *el;   /* editline cookie */
69 int displayhist;
70 static FILE *el_in, *el_out, *el_err;
71
72 static char *fc_replace(const char *, char *, char *);
73 static int not_fcnumber(const char *);
74 static int str_to_event(const char *, int);
75
76 /*
77  * Set history and editing status.  Called whenever the status may
78  * have changed (figures out what to do).
79  */
80 void
81 histedit(void)
82 {
83
84 #define editing (Eflag || Vflag)
85
86         if (iflag) {
87                 if (!hist) {
88                         /*
89                          * turn history on
90                          */
91                         INTOFF;
92                         hist = history_init();
93                         INTON;
94
95                         if (hist != NULL)
96                                 sethistsize(histsizeval());
97                         else
98                                 out2fmt_flush("sh: can't initialize history\n");
99                 }
100                 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
101                         /*
102                          * turn editing on
103                          */
104                         char *term;
105
106                         INTOFF;
107                         if (el_in == NULL)
108                                 el_in = fdopen(0, "r");
109                         if (el_err == NULL)
110                                 el_err = fdopen(1, "w");
111                         if (el_out == NULL)
112                                 el_out = fdopen(2, "w");
113                         if (el_in == NULL || el_err == NULL || el_out == NULL)
114                                 goto bad;
115                         term = lookupvar("TERM");
116                         if (term)
117                                 setenv("TERM", term, 1);
118                         else
119                                 unsetenv("TERM");
120                         el = el_init(arg0, el_in, el_out, el_err);
121                         if (el != NULL) {
122                                 if (hist)
123                                         el_set(el, EL_HIST, history, hist);
124                                 el_set(el, EL_PROMPT, getprompt);
125                                 el_set(el, EL_ADDFN, "sh-complete",
126                                     "Filename completion",
127                                     _el_fn_sh_complete);
128                         } else {
129 bad:
130                                 out2fmt_flush("sh: can't initialize editing\n");
131                         }
132                         INTON;
133                 } else if (!editing && el) {
134                         INTOFF;
135                         el_end(el);
136                         el = NULL;
137                         INTON;
138                 }
139                 if (el) {
140                         if (Vflag)
141                                 el_set(el, EL_EDITOR, "vi");
142                         else if (Eflag)
143                                 el_set(el, EL_EDITOR, "emacs");
144                         el_set(el, EL_BIND, "^I", "sh-complete", NULL);
145                         el_source(el, NULL);
146                 }
147         } else {
148                 INTOFF;
149                 if (el) {       /* no editing if not interactive */
150                         el_end(el);
151                         el = NULL;
152                 }
153                 if (hist) {
154                         history_end(hist);
155                         hist = NULL;
156                 }
157                 INTON;
158         }
159 }
160
161
162 void
163 sethistsize(hs)
164         const char *hs;
165 {
166         int histsize;
167         HistEvent he;
168
169         if (hist != NULL) {
170                 if (hs == NULL || *hs == '\0' ||
171                    (histsize = atoi(hs)) < 0)
172                         histsize = 100;
173                 history(hist, &he, H_SETSIZE, histsize);
174                 history(hist, &he, H_SETUNIQUE, 1);
175         }
176 }
177
178 void
179 setterm(const char *term)
180 {
181         if (rootshell && el != NULL && term != NULL)
182                 el_set(el, EL_TERMINAL, term);
183 }
184
185 int
186 histcmd(int argc, char **argv)
187 {
188         int ch;
189         const char *editor = NULL;
190         HistEvent he;
191         int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
192         int i, retval;
193         const char *firststr, *laststr;
194         int first, last, direction;
195         char *pat = NULL, *repl = NULL;
196         static int active = 0;
197         struct jmploc jmploc;
198         struct jmploc *savehandler;
199         char editfilestr[PATH_MAX];
200         char *volatile editfile;
201         FILE *efp = NULL;
202         int oldhistnum;
203
204         if (hist == NULL)
205                 error("history not active");
206
207         if (argc == 1)
208                 error("missing history argument");
209
210         optreset = 1; optind = 1; /* initialize getopt */
211         opterr = 0;
212         while (not_fcnumber(argv[optind]) &&
213               (ch = getopt(argc, argv, ":e:lnrs")) != -1)
214                 switch ((char)ch) {
215                 case 'e':
216                         editor = optarg;
217                         break;
218                 case 'l':
219                         lflg = 1;
220                         break;
221                 case 'n':
222                         nflg = 1;
223                         break;
224                 case 'r':
225                         rflg = 1;
226                         break;
227                 case 's':
228                         sflg = 1;
229                         break;
230                 case ':':
231                         error("option -%c expects argument", optopt);
232                 case '?':
233                 default:
234                         error("unknown option: -%c", optopt);
235                 }
236         argc -= optind, argv += optind;
237
238         savehandler = handler;
239         /*
240          * If executing...
241          */
242         if (lflg == 0 || editor || sflg) {
243                 lflg = 0;       /* ignore */
244                 editfile = NULL;
245                 /*
246                  * Catch interrupts to reset active counter and
247                  * cleanup temp files.
248                  */
249                 if (setjmp(jmploc.loc)) {
250                         active = 0;
251                         if (editfile)
252                                 unlink(editfile);
253                         handler = savehandler;
254                         longjmp(handler->loc, 1);
255                 }
256                 handler = &jmploc;
257                 if (++active > MAXHISTLOOPS) {
258                         active = 0;
259                         displayhist = 0;
260                         error("called recursively too many times");
261                 }
262                 /*
263                  * Set editor.
264                  */
265                 if (sflg == 0) {
266                         if (editor == NULL &&
267                             (editor = bltinlookup("FCEDIT", 1)) == NULL &&
268                             (editor = bltinlookup("EDITOR", 1)) == NULL)
269                                 editor = DEFEDITOR;
270                         if (editor[0] == '-' && editor[1] == '\0') {
271                                 sflg = 1;       /* no edit */
272                                 editor = NULL;
273                         }
274                 }
275         }
276
277         /*
278          * If executing, parse [old=new] now
279          */
280         if (lflg == 0 && argc > 0 &&
281              ((repl = strchr(argv[0], '=')) != NULL)) {
282                 pat = argv[0];
283                 *repl++ = '\0';
284                 argc--, argv++;
285         }
286         /*
287          * determine [first] and [last]
288          */
289         switch (argc) {
290         case 0:
291                 firststr = lflg ? "-16" : "-1";
292                 laststr = "-1";
293                 break;
294         case 1:
295                 firststr = argv[0];
296                 laststr = lflg ? "-1" : argv[0];
297                 break;
298         case 2:
299                 firststr = argv[0];
300                 laststr = argv[1];
301                 break;
302         default:
303                 error("too many arguments");
304         }
305         /*
306          * Turn into event numbers.
307          */
308         first = str_to_event(firststr, 0);
309         last = str_to_event(laststr, 1);
310
311         if (rflg) {
312                 i = last;
313                 last = first;
314                 first = i;
315         }
316         /*
317          * XXX - this should not depend on the event numbers
318          * always increasing.  Add sequence numbers or offset
319          * to the history element in next (diskbased) release.
320          */
321         direction = first < last ? H_PREV : H_NEXT;
322
323         /*
324          * If editing, grab a temp file.
325          */
326         if (editor) {
327                 int fd;
328                 INTOFF;         /* easier */
329                 sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP);
330                 if ((fd = mkstemp(editfilestr)) < 0)
331                         error("can't create temporary file %s", editfile);
332                 editfile = editfilestr;
333                 if ((efp = fdopen(fd, "w")) == NULL) {
334                         close(fd);
335                         error("Out of space");
336                 }
337         }
338
339         /*
340          * Loop through selected history events.  If listing or executing,
341          * do it now.  Otherwise, put into temp file and call the editor
342          * after.
343          *
344          * The history interface needs rethinking, as the following
345          * convolutions will demonstrate.
346          */
347         history(hist, &he, H_FIRST);
348         retval = history(hist, &he, H_NEXT_EVENT, first);
349         for (;retval != -1; retval = history(hist, &he, direction)) {
350                 if (lflg) {
351                         if (!nflg)
352                                 out1fmt("%5d ", he.num);
353                         out1str(he.str);
354                 } else {
355                         char *s = pat ?
356                            fc_replace(he.str, pat, repl) : (char *)he.str;
357
358                         if (sflg) {
359                                 if (displayhist) {
360                                         out2str(s);
361                                         flushout(out2);
362                                 }
363                                 evalstring(s, 0);
364                                 if (displayhist && hist) {
365                                         /*
366                                          *  XXX what about recursive and
367                                          *  relative histnums.
368                                          */
369                                         oldhistnum = he.num;
370                                         history(hist, &he, H_ENTER, s);
371                                         /*
372                                          * XXX H_ENTER moves the internal
373                                          * cursor, set it back to the current
374                                          * entry.
375                                          */
376                                         retval = history(hist, &he,
377                                             H_NEXT_EVENT, oldhistnum);
378                                 }
379                         } else
380                                 fputs(s, efp);
381                 }
382                 /*
383                  * At end?  (if we were to lose last, we'd sure be
384                  * messed up).
385                  */
386                 if (he.num == last)
387                         break;
388         }
389         if (editor) {
390                 char *editcmd;
391
392                 fclose(efp);
393                 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
394                 sprintf(editcmd, "%s %s", editor, editfile);
395                 evalstring(editcmd, 0); /* XXX - should use no JC command */
396                 INTON;
397                 readcmdfile(editfile);  /* XXX - should read back - quick tst */
398                 unlink(editfile);
399         }
400
401         if (lflg == 0 && active > 0)
402                 --active;
403         if (displayhist)
404                 displayhist = 0;
405         handler = savehandler;
406         return 0;
407 }
408
409 static char *
410 fc_replace(const char *s, char *p, char *r)
411 {
412         char *dest;
413         int plen = strlen(p);
414
415         STARTSTACKSTR(dest);
416         while (*s) {
417                 if (*s == *p && strncmp(s, p, plen) == 0) {
418                         STPUTS(r, dest);
419                         s += plen;
420                         *p = '\0';      /* so no more matches */
421                 } else
422                         STPUTC(*s++, dest);
423         }
424         STPUTC('\0', dest);
425         dest = grabstackstr(dest);
426
427         return (dest);
428 }
429
430 static int
431 not_fcnumber(const char *s)
432 {
433         if (s == NULL)
434                 return (0);
435         if (*s == '-')
436                 s++;
437         return (!is_number(s));
438 }
439
440 static int
441 str_to_event(const char *str, int last)
442 {
443         HistEvent he;
444         const char *s = str;
445         int relative = 0;
446         int i, retval;
447
448         retval = history(hist, &he, H_FIRST);
449         switch (*s) {
450         case '-':
451                 relative = 1;
452                 /*FALLTHROUGH*/
453         case '+':
454                 s++;
455         }
456         if (is_number(s)) {
457                 i = atoi(s);
458                 if (relative) {
459                         while (retval != -1 && i--) {
460                                 retval = history(hist, &he, H_NEXT);
461                         }
462                         if (retval == -1)
463                                 retval = history(hist, &he, H_LAST);
464                 } else {
465                         retval = history(hist, &he, H_NEXT_EVENT, i);
466                         if (retval == -1) {
467                                 /*
468                                  * the notion of first and last is
469                                  * backwards to that of the history package
470                                  */
471                                 retval = history(hist, &he, last ? H_FIRST : H_LAST);
472                         }
473                 }
474                 if (retval == -1)
475                         error("history number %s not found (internal error)",
476                                str);
477         } else {
478                 /*
479                  * pattern
480                  */
481                 retval = history(hist, &he, H_PREV_STR, str);
482                 if (retval == -1)
483                         error("history pattern not found: %s", str);
484         }
485         return (he.num);
486 }
487
488 int
489 bindcmd(int argc, char **argv)
490 {
491
492         if (el == NULL)
493                 error("line editing is disabled");
494         return (el_parse(el, argc, (const char **)argv));
495 }
496
497 #else
498 #include "error.h"
499
500 int
501 histcmd(int argc, char **argv)
502 {
503
504         error("not compiled with history support");
505         /*NOTREACHED*/
506         return (0);
507 }
508
509 int
510 bindcmd(int argc, char **argv)
511 {
512
513         error("not compiled with line editing support");
514         return (0);
515 }
516 #endif