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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)histedit.c       8.2 (Berkeley) 5/4/95
  37  * $FreeBSD: src/bin/sh/histedit.c,v 1.29 2006/08/04 07:56:31 yar Exp $
  38  * $DragonFly: src/bin/sh/histedit.c,v 1.12 2008/02/13 15:13:37 matthias Exp $
  39  */
  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 #include "myhistedit.h"
  58 #ifndef NO_HISTORY
  59 #include "error.h"
  60 #include "eval.h"
  61 #include "memalloc.h"
  62
  63 #define MAXHISTLOOPS    4       /* max recursions through fc */
  64 #define DEFEDITOR       "ed"    /* default editor *should* be $EDITOR */
  65
  66 History *hist;  /* history cookie */
  67 EditLine *el;   /* editline cookie */
  68 int displayhist;
  69 static FILE *el_in, *el_out, *el_err;
  70 unsigned char _el_fn_complete(EditLine *, int);
  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                                 out2str("sh: can't initialize history\n");
  97                 }
  98                 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
  99                         /*
 100                          * turn editing on
 101                          */
 102                         char *term, *shname;
 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                                 if (setenv("TERM", term, 1) == -1)
 116                                         error("setenv: cannot set TERM=1");
 117                         }
 118                         else
 119                                 unsetenv("TERM");
 120                         shname = arg0;
 121                         if (shname[0] == '-')
 122                                 shname++;
 123                         el = el_init(arg0, el_in, el_out, el_err);
 124                         if (el != NULL) {
 125                                 if (hist)
 126                                         el_set(el, EL_HIST, history, hist);
 127                                 el_set(el, EL_PROMPT, getprompt);
 128                                 el_set(el, EL_ADDFN, "rl-complete",
 129                                     "ReadLine compatible completion function",
 130                                     _el_fn_complete);
 131                         } else {
 132 bad:
 133                                 out2str("sh: can't initialize editing\n");
 134                         }
 135                         INTON;
 136                 } else if (!editing && el) {
 137                         INTOFF;
 138                         el_end(el);
 139                         el = NULL;
 140                         INTON;
 141                 }
 142                 if (el) {
 143                         if (Vflag)
 144                                 el_set(el, EL_EDITOR, "vi");
 145                         else if (Eflag)
 146                                 el_set(el, EL_EDITOR, "emacs");
 147                         el_set(el, EL_BIND, "^I",
 148                             tabcomplete ? "rl-complete" : "ed-insert", NULL);
 149                         el_source(el, NULL);
 150                 }
 151         } else {
 152                 INTOFF;
 153                 if (el) {       /* no editing if not interactive */
 154                         el_end(el);
 155                         el = NULL;
 156                 }
 157                 if (hist) {
 158                         history_end(hist);
 159                         hist = NULL;
 160                 }
 161                 INTON;
 162         }
 163 }
 164
 165
 166 void
 167 sethistsize(const char *hs)
 168 {
 169         int histsize;
 170         HistEvent he;
 171
 172         if (hist != NULL) {
 173                 if (hs == NULL || *hs == '\0' ||
 174                    (histsize = atoi(hs)) < 0)
 175                         histsize = 100;
 176                 history(hist, &he, H_SETSIZE, histsize);
 177                 history(hist, &he, H_SETUNIQUE, 1);
 178         }
 179 }
 180
 181 int
 182 histcmd(int argc, char **argv)
 183 {
 184         int ch;
 185         const char *volatile editor = NULL;
 186         HistEvent he;
 187         volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
 188         int i, retval;
 189         const char *firststr = NULL, *laststr = NULL;
 190         int first, last, direction;
 191         char *pat = NULL, *repl = NULL;
 192         static int active = 0;
 193         struct jmploc jmploc;
 194         struct jmploc *volatile savehandler;
 195         char editfile[PATH_MAX];
 196         FILE *efp = NULL;
 197         int oldhistnum;
 198
 199         if (hist == NULL)
 200                 error("history not active");
 201
 202         if (argc == 1)
 203                 error("missing history argument");
 204
 205         optreset = 1; optind = 1; /* initialize getopt */
 206         opterr = 0;
 207         while (not_fcnumber(argv[optind]) &&
 208               (ch = getopt(argc, argv, ":e:lnrs")) != -1)
 209                 switch ((char)ch) {
 210                 case 'e':
 211                         editor = optarg;
 212                         break;
 213                 case 'l':
 214                         lflg = 1;
 215                         break;
 216                 case 'n':
 217                         nflg = 1;
 218                         break;
 219                 case 'r':
 220                         rflg = 1;
 221                         break;
 222                 case 's':
 223                         sflg = 1;
 224                         break;
 225                 case ':':
 226                         error("option -%c expects argument", optopt);
 227                 case '?':
 228                 default:
 229                         error("unknown option: -%c", optopt);
 230                 }
 231         argc -= optind, argv += optind;
 232
 233         /*
 234          * If executing...
 235          */
 236         if (lflg == 0 || editor || sflg) {
 237                 lflg = 0;       /* ignore */
 238                 editfile[0] = '\0';
 239                 /*
 240                  * Catch interrupts to reset active counter and
 241                  * cleanup temp files.
 242                  */
 243                 if (setjmp(jmploc.loc)) {
 244                         active = 0;
 245                         if (*editfile)
 246                                 unlink(editfile);
 247                         handler = savehandler;
 248                         longjmp(handler->loc, 1);
 249                 }
 250                 savehandler = handler;
 251                 handler = &jmploc;
 252                 if (++active > MAXHISTLOOPS) {
 253                         active = 0;
 254                         displayhist = 0;
 255                         error("called recursively too many times");
 256                 }
 257                 /*
 258                  * Set editor.
 259                  */
 260                 if (sflg == 0) {
 261                         if (editor == NULL &&
 262                             (editor = bltinlookup("FCEDIT", 1)) == NULL &&
 263                             (editor = bltinlookup("EDITOR", 1)) == NULL)
 264                                 editor = DEFEDITOR;
 265                         if (editor[0] == '-' && editor[1] == '\0') {
 266                                 sflg = 1;       /* no edit */
 267                                 editor = NULL;
 268                         }
 269                 }
 270         }
 271
 272         /*
 273          * If executing, parse [old=new] now
 274          */
 275         if (lflg == 0 && argc > 0 &&
 276              ((repl = strchr(argv[0], '=')) != NULL)) {
 277                 pat = argv[0];
 278                 *repl++ = '\0';
 279                 argc--, argv++;
 280         }
 281         /*
 282          * determine [first] and [last]
 283          */
 284         switch (argc) {
 285         case 0:
 286                 firststr = lflg ? "-16" : "-1";
 287                 laststr = "-1";
 288                 break;
 289         case 1:
 290                 firststr = argv[0];
 291                 laststr = lflg ? "-1" : argv[0];
 292                 break;
 293         case 2:
 294                 firststr = argv[0];
 295                 laststr = argv[1];
 296                 break;
 297         default:
 298                 error("too many args");
 299         }
 300         /*
 301          * Turn into event numbers.
 302          */
 303         first = str_to_event(firststr, 0);
 304         last = str_to_event(laststr, 1);
 305
 306         if (rflg) {
 307                 i = last;
 308                 last = first;
 309                 first = i;
 310         }
 311         /*
 312          * XXX - this should not depend on the event numbers
 313          * always increasing.  Add sequence numbers or offset
 314          * to the history element in next (diskbased) release.
 315          */
 316         direction = first < last ? H_PREV : H_NEXT;
 317
 318         /*
 319          * If editing, grab a temp file.
 320          */
 321         if (editor) {
 322                 int fd;
 323                 INTOFF;         /* easier */
 324                 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
 325                 if ((fd = mkstemp(editfile)) < 0)
 326                         error("can't create temporary file %s", editfile);
 327                 if ((efp = fdopen(fd, "w")) == NULL) {
 328                         close(fd);
 329                         error("can't allocate stdio buffer for temp");
 330                 }
 331         }
 332
 333         /*
 334          * Loop through selected history events.  If listing or executing,
 335          * do it now.  Otherwise, put into temp file and call the editor
 336          * after.
 337          *
 338          * The history interface needs rethinking, as the following
 339          * convolutions will demonstrate.
 340          */
 341         history(hist, &he, H_FIRST);
 342         retval = history(hist, &he, H_NEXT_EVENT, first);
 343         for (;retval != -1; retval = history(hist, &he, direction)) {
 344                 if (lflg) {
 345                         if (!nflg)
 346                                 out1fmt("%5d ", he.num);
 347                         out1str(he.str);
 348                 } else {
 349                         const char *s = pat ?
 350                            fc_replace(he.str, pat, repl) : he.str;
 351
 352                         if (sflg) {
 353                                 if (displayhist) {
 354                                         out2str(s);
 355                                 }
 356                                 evalstring(strcpy(stalloc(strlen(s) + 1), s));
 357                                 if (displayhist && hist) {
 358                                         /*
 359                                          *  XXX what about recursive and
 360                                          *  relative histnums.
 361                                          */
 362                                         oldhistnum = he.num;
 363                                         history(hist, &he, H_ENTER, s);
 364                                         /*
 365                                          * XXX H_ENTER moves the internal
 366                                          * cursor, set it back to the current
 367                                          * entry.
 368                                          */
 369                                         retval = history(hist, &he,
 370                                             H_NEXT_EVENT, oldhistnum);
 371                                 }
 372                         } else
 373                                 fputs(s, efp);
 374                 }
 375                 /*
 376                  * At end?  (if we were to lose last, we'd sure be
 377                  * messed up).
 378                  */
 379                 if (he.num == last)
 380                         break;
 381         }
 382         if (editor) {
 383                 char *editcmd;
 384
 385                 fclose(efp);
 386                 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
 387                 sprintf(editcmd, "%s %s", editor, editfile);
 388                 evalstring(editcmd);    /* XXX - should use no JC command */
 389                 INTON;
 390                 readcmdfile(editfile);  /* XXX - should read back - quick tst */
 391                 unlink(editfile);
 392         }
 393
 394         if (lflg == 0 && active > 0)
 395                 --active;
 396         if (displayhist)
 397                 displayhist = 0;
 398         return 0;
 399 }
 400
 401 STATIC char *
 402 fc_replace(const char *s, char *p, char *r)
 403 {
 404         char *dest;
 405         int plen = strlen(p);
 406
 407         STARTSTACKSTR(dest);
 408         while (*s) {
 409                 if (*s == *p && strncmp(s, p, plen) == 0) {
 410                         while (*r)
 411                                 STPUTC(*r++, dest);
 412                         s += plen;
 413                         *p = '\0';      /* so no more matches */
 414                 } else
 415                         STPUTC(*s++, dest);
 416         }
 417         STACKSTRNUL(dest);
 418         dest = grabstackstr(dest);
 419
 420         return (dest);
 421 }
 422
 423 int
 424 not_fcnumber(char *s)
 425 {
 426         if (s == NULL)
 427                 return (0);
 428         if (*s == '-')
 429                 s++;
 430         return (!is_number(s));
 431 }
 432
 433 int
 434 str_to_event(const char *str, int last)
 435 {
 436         HistEvent he;
 437         const char *s = str;
 438         int relative = 0;
 439         int i, retval;
 440
 441         retval = history(hist, &he, H_FIRST);
 442         switch (*s) {
 443         case '-':
 444                 relative = 1;
 445                 /*FALLTHROUGH*/
 446         case '+':
 447                 s++;
 448         }
 449         if (is_number(s)) {
 450                 i = atoi(s);
 451                 if (relative) {
 452                         while (retval != -1 && i--) {
 453                                 retval = history(hist, &he, H_NEXT);
 454                         }
 455                         if (retval == -1)
 456                                 retval = history(hist, &he, H_LAST);
 457                 } else {
 458                         retval = history(hist, &he, H_NEXT_EVENT, i);
 459                         if (retval == -1) {
 460                                 /*
 461                                  * the notion of first and last is
 462                                  * backwards to that of the history package
 463                                  */
 464                                 retval = history(hist, &he, last ? H_FIRST : H_LAST);
 465                         }
 466                 }
 467                 if (retval == -1)
 468                         error("history number %s not found (internal error)",
 469                                str);
 470         } else {
 471                 /*
 472                  * pattern
 473                  */
 474                 retval = history(hist, &he, H_PREV_STR, str);
 475                 if (retval == -1)
 476                         error("history pattern not found: %s", str);
 477         }
 478         return (he.num);
 479 }
 480
 481 int
 482 bindcmd(int argc, char **argv)
 483 {
 484
 485         if (el == NULL)
 486                 error("line editing is disabled");
 487         return (el_parse(el, argc, (const char **)argv));
 488 }
 489
 490 #else
 491 #include "error.h"
 492
 493 int
 494 histcmd(int argc __unused, char **argv __unused)
 495 {
 496
 497         error("not compiled with history support");
 498         /*NOTREACHED*/
 499         return (0);
 500 }
 501
 502 int
 503 bindcmd(int argc __unused, char **argv __unused)
 504 {
 505
 506         error("not compiled with line editing support");
 507         return (0);
 508 }
 509 #endif