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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
74 /*
75  * Set history and editing status.  Called whenever the status may
76  * have changed (figures out what to do).
77  */
78 void
79 histedit(void)
80 {
81
82 #define editing (Eflag || Vflag)
83
84         if (iflag) {
85                 if (!hist) {
86                         /*
87                          * turn history on
88                          */
89                         INTOFF;
90                         hist = history_init();
91                         INTON;
92
93                         if (hist != NULL)
94                                 sethistsize(histsizeval());
95                         else
96                                 out2fmt_flush("sh: can't initialize history\n");
97                 }
98                 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
99                         /*
100                          * turn editing on
101                          */
102                         char *term;
103
104                         INTOFF;
105                         if (el_in == NULL)
106                                 el_in = fdopen(0, "r");
107                         if (el_err == NULL)
108                                 el_err = fdopen(1, "w");
109                         if (el_out == NULL)
110                                 el_out = fdopen(2, "w");
111                         if (el_in == NULL || el_err == NULL || el_out == NULL)
112                                 goto bad;
113                         term = lookupvar("TERM");
114                         if (term)
115                                 setenv("TERM", term, 1);
116                         else
117                                 unsetenv("TERM");
118                         el = el_init(arg0, el_in, el_out, el_err);
119                         if (el != NULL) {
120                                 if (hist)
121                                         el_set(el, EL_HIST, history, hist);
122                                 el_set(el, EL_PROMPT, getprompt);
123                                 el_set(el, EL_ADDFN, "sh-complete",
124                                     "Filename completion",
125                                     _el_fn_sh_complete);
126                         } else {
127 bad:
128                                 out2fmt_flush("sh: can't initialize editing\n");
129                         }
130                         INTON;
131                 } else if (!editing && el) {
132                         INTOFF;
133                         el_end(el);
134                         el = NULL;
135                         INTON;
136                 }
137                 if (el) {
138                         if (Vflag)
139                                 el_set(el, EL_EDITOR, "vi");
140                         else if (Eflag)
141                                 el_set(el, EL_EDITOR, "emacs");
142                         el_set(el, EL_BIND, "^I", "sh-complete", NULL);
143                         el_source(el, NULL);
144                 }
145         } else {
146                 INTOFF;
147                 if (el) {       /* no editing if not interactive */
148                         el_end(el);
149                         el = NULL;
150                 }
151                 if (hist) {
152                         history_end(hist);
153                         hist = NULL;
154                 }
155                 INTON;
156         }
157 }
158
159
160 void
161 sethistsize(hs)
162         const char *hs;
163 {
164         int histsize;
165         HistEvent he;
166
167         if (hist != NULL) {
168                 if (hs == NULL || *hs == '\0' ||
169                    (histsize = atoi(hs)) < 0)
170                         histsize = 100;
171                 history(hist, &he, H_SETSIZE, histsize);
172                 history(hist, &he, H_SETUNIQUE, 1);
173         }
174 }
175
176 void
177 setterm(const char *term)
178 {
179         if (rootshell && el != NULL && term != NULL)
180                 el_set(el, EL_TERMINAL, term);
181 }
182
183 int
184 histcmd(int argc, char **argv)
185 {
186         int ch;
187         const char *editor = NULL;
188         HistEvent he;
189         int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
190         int i, retval;
191         const char *firststr, *laststr;
192         int first, last, direction;
193         char *pat = NULL, *repl = NULL;
194         static int active = 0;
195         struct jmploc jmploc;
196         struct jmploc *savehandler;
197         char editfilestr[PATH_MAX];
198         char *volatile editfile;
199         FILE *efp = NULL;
200         int oldhistnum;
201
202         if (hist == NULL)
203                 error("history not active");
204
205         if (argc == 1)
206                 error("missing history argument");
207
208         optreset = 1; optind = 1; /* initialize getopt */
209         opterr = 0;
210         while (not_fcnumber(argv[optind]) &&
211               (ch = getopt(argc, argv, ":e:lnrs")) != -1)
212                 switch ((char)ch) {
213                 case 'e':
214                         editor = optarg;
215                         break;
216                 case 'l':
217                         lflg = 1;
218                         break;
219                 case 'n':
220                         nflg = 1;
221                         break;
222                 case 'r':
223                         rflg = 1;
224                         break;
225                 case 's':
226                         sflg = 1;
227                         break;
228                 case ':':
229                         error("option -%c expects argument", optopt);
230                 case '?':
231                 default:
232                         error("unknown option: -%c", optopt);
233                 }
234         argc -= optind, argv += optind;
235
236         savehandler = handler;
237         /*
238          * If executing...
239          */
240         if (lflg == 0 || editor || sflg) {
241                 lflg = 0;       /* ignore */
242                 editfile = NULL;
243                 /*
244                  * Catch interrupts to reset active counter and
245                  * cleanup temp files.
246                  */
247                 if (setjmp(jmploc.loc)) {
248                         active = 0;
249                         if (editfile)
250                                 unlink(editfile);
251                         handler = savehandler;
252                         longjmp(handler->loc, 1);
253                 }
254                 handler = &jmploc;
255                 if (++active > MAXHISTLOOPS) {
256                         active = 0;
257                         displayhist = 0;
258                         error("called recursively too many times");
259                 }
260                 /*
261                  * Set editor.
262                  */
263                 if (sflg == 0) {
264                         if (editor == NULL &&
265                             (editor = bltinlookup("FCEDIT", 1)) == NULL &&
266                             (editor = bltinlookup("EDITOR", 1)) == NULL)
267                                 editor = DEFEDITOR;
268                         if (editor[0] == '-' && editor[1] == '\0') {
269                                 sflg = 1;       /* no edit */
270                                 editor = NULL;
271                         }
272                 }
273         }
274
275         /*
276          * If executing, parse [old=new] now
277          */
278         if (lflg == 0 && argc > 0 &&
279              ((repl = strchr(argv[0], '=')) != NULL)) {
280                 pat = argv[0];
281                 *repl++ = '\0';
282                 argc--, argv++;
283         }
284         /*
285          * determine [first] and [last]
286          */
287         switch (argc) {
288         case 0:
289                 firststr = lflg ? "-16" : "-1";
290                 laststr = "-1";
291                 break;
292         case 1:
293                 firststr = argv[0];
294                 laststr = lflg ? "-1" : argv[0];
295                 break;
296         case 2:
297                 firststr = argv[0];
298                 laststr = argv[1];
299                 break;
300         default:
301                 error("too many arguments");
302         }
303         /*
304          * Turn into event numbers.
305          */
306         first = str_to_event(firststr, 0);
307         last = str_to_event(laststr, 1);
308
309         if (rflg) {
310                 i = last;
311                 last = first;
312                 first = i;
313         }
314         /*
315          * XXX - this should not depend on the event numbers
316          * always increasing.  Add sequence numbers or offset
317          * to the history element in next (diskbased) release.
318          */
319         direction = first < last ? H_PREV : H_NEXT;
320
321         /*
322          * If editing, grab a temp file.
323          */
324         if (editor) {
325                 int fd;
326                 INTOFF;         /* easier */
327                 sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP);
328                 if ((fd = mkstemp(editfilestr)) < 0)
329                         error("can't create temporary file %s", editfile);
330                 editfile = editfilestr;
331                 if ((efp = fdopen(fd, "w")) == NULL) {
332                         close(fd);
333                         error("Out of space");
334                 }
335         }
336
337         /*
338          * Loop through selected history events.  If listing or executing,
339          * do it now.  Otherwise, put into temp file and call the editor
340          * after.
341          *
342          * The history interface needs rethinking, as the following
343          * convolutions will demonstrate.
344          */
345         history(hist, &he, H_FIRST);
346         retval = history(hist, &he, H_NEXT_EVENT, first);
347         for (;retval != -1; retval = history(hist, &he, direction)) {
348                 if (lflg) {
349                         if (!nflg)
350                                 out1fmt("%5d ", he.num);
351                         out1str(he.str);
352                 } else {
353                         char *s = pat ?
354                            fc_replace(he.str, pat, repl) : (char *)he.str;
355
356                         if (sflg) {
357                                 if (displayhist) {
358                                         out2str(s);
359                                         flushout(out2);
360                                 }
361                                 evalstring(s, 0);
362                                 if (displayhist && hist) {
363                                         /*
364                                          *  XXX what about recursive and
365                                          *  relative histnums.
366                                          */
367                                         oldhistnum = he.num;
368                                         history(hist, &he, H_ENTER, s);
369                                         /*
370                                          * XXX H_ENTER moves the internal
371                                          * cursor, set it back to the current
372                                          * entry.
373                                          */
374                                         retval = history(hist, &he,
375                                             H_NEXT_EVENT, oldhistnum);
376                                 }
377                         } else
378                                 fputs(s, efp);
379                 }
380                 /*
381                  * At end?  (if we were to lose last, we'd sure be
382                  * messed up).
383                  */
384                 if (he.num == last)
385                         break;
386         }
387         if (editor) {
388                 char *editcmd;
389
390                 fclose(efp);
391                 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
392                 sprintf(editcmd, "%s %s", editor, editfile);
393                 evalstring(editcmd, 0); /* XXX - should use no JC command */
394                 INTON;
395                 readcmdfile(editfile);  /* XXX - should read back - quick tst */
396                 unlink(editfile);
397         }
398
399         if (lflg == 0 && active > 0)
400                 --active;
401         if (displayhist)
402                 displayhist = 0;
403         handler = savehandler;
404         return 0;
405 }
406
407 static char *
408 fc_replace(const char *s, char *p, char *r)
409 {
410         char *dest;
411         int plen = strlen(p);
412
413         STARTSTACKSTR(dest);
414         while (*s) {
415                 if (*s == *p && strncmp(s, p, plen) == 0) {
416                         STPUTS(r, dest);
417                         s += plen;
418                         *p = '\0';      /* so no more matches */
419                 } else
420                         STPUTC(*s++, dest);
421         }
422         STPUTC('\0', dest);
423         dest = grabstackstr(dest);
424
425         return (dest);
426 }
427
428 int
429 not_fcnumber(const char *s)
430 {
431         if (s == NULL)
432                 return (0);
433         if (*s == '-')
434                 s++;
435         return (!is_number(s));
436 }
437
438 int
439 str_to_event(const char *str, int last)
440 {
441         HistEvent he;
442         const char *s = str;
443         int relative = 0;
444         int i, retval;
445
446         retval = history(hist, &he, H_FIRST);
447         switch (*s) {
448         case '-':
449                 relative = 1;
450                 /*FALLTHROUGH*/
451         case '+':
452                 s++;
453         }
454         if (is_number(s)) {
455                 i = atoi(s);
456                 if (relative) {
457                         while (retval != -1 && i--) {
458                                 retval = history(hist, &he, H_NEXT);
459                         }
460                         if (retval == -1)
461                                 retval = history(hist, &he, H_LAST);
462                 } else {
463                         retval = history(hist, &he, H_NEXT_EVENT, i);
464                         if (retval == -1) {
465                                 /*
466                                  * the notion of first and last is
467                                  * backwards to that of the history package
468                                  */
469                                 retval = history(hist, &he, last ? H_FIRST : H_LAST);
470                         }
471                 }
472                 if (retval == -1)
473                         error("history number %s not found (internal error)",
474                                str);
475         } else {
476                 /*
477                  * pattern
478                  */
479                 retval = history(hist, &he, H_PREV_STR, str);
480                 if (retval == -1)
481                         error("history pattern not found: %s", str);
482         }
483         return (he.num);
484 }
485
486 int
487 bindcmd(int argc, char **argv)
488 {
489
490         if (el == NULL)
491                 error("line editing is disabled");
492         return (el_parse(el, argc, (const char **)argv));
493 }
494
495 #else
496 #include "error.h"
497
498 int
499 histcmd(int argc, char **argv)
500 {
501
502         error("not compiled with history support");
503         /*NOTREACHED*/
504         return (0);
505 }
506
507 int
508 bindcmd(int argc, char **argv)
509 {
510
511         error("not compiled with line editing support");
512         return (0);
513 }
514 #endif