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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 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(const char *hs)
164 {
165         int histsize;
166         HistEvent he;
167
168         if (hist != NULL) {
169                 if (hs == NULL || *hs == '\0' ||
170                    (histsize = atoi(hs)) < 0)
171                         histsize = 100;
172                 history(hist, &he, H_SETSIZE, histsize);
173                 history(hist, &he, H_SETUNIQUE, 1);
174         }
175 }
176
177 void
178 setterm(const char *term)
179 {
180         if (rootshell && el != NULL && term != NULL)
181                 el_set(el, EL_TERMINAL, term);
182 }
183
184 int
185 histcmd(int argc, char **argv __unused)
186 {
187         int ch;
188         const char *editor = NULL;
189         HistEvent he;
190         int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
191         int i, retval;
192         const char *firststr, *laststr;
193         int first, last, direction;
194         char *pat = NULL, *repl = NULL;
195         static int active = 0;
196         struct jmploc jmploc;
197         struct jmploc *savehandler;
198         char editfilestr[PATH_MAX];
199         char *volatile editfile;
200         FILE *efp = NULL;
201         int oldhistnum;
202
203         if (hist == NULL)
204                 error("history not active");
205
206         if (argc == 1)
207                 error("missing history argument");
208
209         while (not_fcnumber(*argptr) && (ch = nextopt("e:lnrs")) != '\0')
210                 switch ((char)ch) {
211                 case 'e':
212                         editor = shoptarg;
213                         break;
214                 case 'l':
215                         lflg = 1;
216                         break;
217                 case 'n':
218                         nflg = 1;
219                         break;
220                 case 'r':
221                         rflg = 1;
222                         break;
223                 case 's':
224                         sflg = 1;
225                         break;
226                 }
227
228         savehandler = handler;
229         /*
230          * If executing...
231          */
232         if (lflg == 0 || editor || sflg) {
233                 lflg = 0;       /* ignore */
234                 editfile = NULL;
235                 /*
236                  * Catch interrupts to reset active counter and
237                  * cleanup temp files.
238                  */
239                 if (setjmp(jmploc.loc)) {
240                         active = 0;
241                         if (editfile)
242                                 unlink(editfile);
243                         handler = savehandler;
244                         longjmp(handler->loc, 1);
245                 }
246                 handler = &jmploc;
247                 if (++active > MAXHISTLOOPS) {
248                         active = 0;
249                         displayhist = 0;
250                         error("called recursively too many times");
251                 }
252                 /*
253                  * Set editor.
254                  */
255                 if (sflg == 0) {
256                         if (editor == NULL &&
257                             (editor = bltinlookup("FCEDIT", 1)) == NULL &&
258                             (editor = bltinlookup("EDITOR", 1)) == NULL)
259                                 editor = DEFEDITOR;
260                         if (editor[0] == '-' && editor[1] == '\0') {
261                                 sflg = 1;       /* no edit */
262                                 editor = NULL;
263                         }
264                 }
265         }
266
267         /*
268          * If executing, parse [old=new] now
269          */
270         if (lflg == 0 && *argptr != NULL &&
271              ((repl = strchr(*argptr, '=')) != NULL)) {
272                 pat = *argptr;
273                 *repl++ = '\0';
274                 argptr++;
275         }
276         /*
277          * determine [first] and [last]
278          */
279         if (*argptr == NULL) {
280                 firststr = lflg ? "-16" : "-1";
281                 laststr = "-1";
282         } else if (argptr[1] == NULL) {
283                 firststr = argptr[0];
284                 laststr = lflg ? "-1" : argptr[0];
285         } else if (argptr[2] == NULL) {
286                 firststr = argptr[0];
287                 laststr = argptr[1];
288         } else
289                 error("too many arguments");
290         /*
291          * Turn into event numbers.
292          */
293         first = str_to_event(firststr, 0);
294         last = str_to_event(laststr, 1);
295
296         if (rflg) {
297                 i = last;
298                 last = first;
299                 first = i;
300         }
301         /*
302          * XXX - this should not depend on the event numbers
303          * always increasing.  Add sequence numbers or offset
304          * to the history element in next (diskbased) release.
305          */
306         direction = first < last ? H_PREV : H_NEXT;
307
308         /*
309          * If editing, grab a temp file.
310          */
311         if (editor) {
312                 int fd;
313                 INTOFF;         /* easier */
314                 sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP);
315                 if ((fd = mkstemp(editfilestr)) < 0)
316                         error("can't create temporary file %s", editfile);
317                 editfile = editfilestr;
318                 if ((efp = fdopen(fd, "w")) == NULL) {
319                         close(fd);
320                         error("Out of space");
321                 }
322         }
323
324         /*
325          * Loop through selected history events.  If listing or executing,
326          * do it now.  Otherwise, put into temp file and call the editor
327          * after.
328          *
329          * The history interface needs rethinking, as the following
330          * convolutions will demonstrate.
331          */
332         history(hist, &he, H_FIRST);
333         retval = history(hist, &he, H_NEXT_EVENT, first);
334         for (;retval != -1; retval = history(hist, &he, direction)) {
335                 if (lflg) {
336                         if (!nflg)
337                                 out1fmt("%5d ", he.num);
338                         out1str(he.str);
339                 } else {
340                         char *s = pat ?
341                            fc_replace(he.str, pat, repl) : (char *)he.str;
342
343                         if (sflg) {
344                                 if (displayhist) {
345                                         out2str(s);
346                                         flushout(out2);
347                                 }
348                                 evalstring(s, 0);
349                                 if (displayhist && hist) {
350                                         /*
351                                          *  XXX what about recursive and
352                                          *  relative histnums.
353                                          */
354                                         oldhistnum = he.num;
355                                         history(hist, &he, H_ENTER, s);
356                                         /*
357                                          * XXX H_ENTER moves the internal
358                                          * cursor, set it back to the current
359                                          * entry.
360                                          */
361                                         retval = history(hist, &he,
362                                             H_NEXT_EVENT, oldhistnum);
363                                 }
364                         } else
365                                 fputs(s, efp);
366                 }
367                 /*
368                  * At end?  (if we were to lose last, we'd sure be
369                  * messed up).
370                  */
371                 if (he.num == last)
372                         break;
373         }
374         if (editor) {
375                 char *editcmd;
376
377                 fclose(efp);
378                 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
379                 sprintf(editcmd, "%s %s", editor, editfile);
380                 evalstring(editcmd, 0); /* XXX - should use no JC command */
381                 INTON;
382                 readcmdfile(editfile);  /* XXX - should read back - quick tst */
383                 unlink(editfile);
384         }
385
386         if (lflg == 0 && active > 0)
387                 --active;
388         if (displayhist)
389                 displayhist = 0;
390         handler = savehandler;
391         return 0;
392 }
393
394 static char *
395 fc_replace(const char *s, char *p, char *r)
396 {
397         char *dest;
398         int plen = strlen(p);
399
400         STARTSTACKSTR(dest);
401         while (*s) {
402                 if (*s == *p && strncmp(s, p, plen) == 0) {
403                         STPUTS(r, dest);
404                         s += plen;
405                         *p = '\0';      /* so no more matches */
406                 } else
407                         STPUTC(*s++, dest);
408         }
409         STPUTC('\0', dest);
410         dest = grabstackstr(dest);
411
412         return (dest);
413 }
414
415 static int
416 not_fcnumber(const char *s)
417 {
418         if (s == NULL)
419                 return (0);
420         if (*s == '-')
421                 s++;
422         return (!is_number(s));
423 }
424
425 static int
426 str_to_event(const char *str, int last)
427 {
428         HistEvent he;
429         const char *s = str;
430         int relative = 0;
431         int i, retval;
432
433         retval = history(hist, &he, H_FIRST);
434         switch (*s) {
435         case '-':
436                 relative = 1;
437                 /*FALLTHROUGH*/
438         case '+':
439                 s++;
440         }
441         if (is_number(s)) {
442                 i = atoi(s);
443                 if (relative) {
444                         while (retval != -1 && i--) {
445                                 retval = history(hist, &he, H_NEXT);
446                         }
447                         if (retval == -1)
448                                 retval = history(hist, &he, H_LAST);
449                 } else {
450                         retval = history(hist, &he, H_NEXT_EVENT, i);
451                         if (retval == -1) {
452                                 /*
453                                  * the notion of first and last is
454                                  * backwards to that of the history package
455                                  */
456                                 retval = history(hist, &he, last ? H_FIRST : H_LAST);
457                         }
458                 }
459                 if (retval == -1)
460                         error("history number %s not found (internal error)",
461                                str);
462         } else {
463                 /*
464                  * pattern
465                  */
466                 retval = history(hist, &he, H_PREV_STR, str);
467                 if (retval == -1)
468                         error("history pattern not found: %s", str);
469         }
470         return (he.num);
471 }
472
473 int
474 bindcmd(int argc, char **argv)
475 {
476
477         if (el == NULL)
478                 error("line editing is disabled");
479         return (el_parse(el, argc, (const char **)argv));
480 }
481
482 #else
483 #include "error.h"
484
485 int
486 histcmd(int argc, char **argv)
487 {
488
489         error("not compiled with history support");
490         /*NOTREACHED*/
491         return (0);
492 }
493
494 int
495 bindcmd(int argc, char **argv)
496 {
497
498         error("not compiled with line editing support");
499         return (0);
500 }
501 #endif