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