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histedit.c revision 1.15 
      1 /*	$NetBSD: histedit.c,v 1.15 1997/09/14 07:43:56 lukem Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Kenneth Almquist.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)histedit.c	8.2 (Berkeley) 5/4/95";
     43 #else
     44 __RCSID("$NetBSD: histedit.c,v 1.15 1997/09/14 07:43:56 lukem Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 #include <sys/param.h>
     49 #include <paths.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <unistd.h>
     53 /*
     54  * Editline and history functions (and glue).
     55  */
     56 #include "shell.h"
     57 #include "parser.h"
     58 #include "var.h"
     59 #include "options.h"
     60 #include "main.h"
     61 #include "output.h"
     62 #include "mystring.h"
     63 #ifndef SMALL
     64 #include "myhistedit.h"
     65 #include "error.h"
     66 #include "eval.h"
     67 #include "memalloc.h"
     68 
     69 #define MAXHISTLOOPS	4	/* max recursions through fc */
     70 #define DEFEDITOR	"ed"	/* default editor *should* be $EDITOR */
     71 
     72 History *hist;	/* history cookie */
     73 EditLine *el;	/* editline cookie */
     74 int displayhist;
     75 static FILE *el_in, *el_out;
     76 
     77 STATIC char *fc_replace __P((const char *, char *, char *));
     78 
     79 /*
     80  * Set history and editing status.  Called whenever the status may
     81  * have changed (figures out what to do).
     82  */
     83 void
     84 histedit()
     85 {
     86 
     87 #define editing (Eflag || Vflag)
     88 
     89 	if (iflag) {
     90 		if (!hist) {
     91 			/*
     92 			 * turn history on
     93 			 */
     94 			INTOFF;
     95 			hist = history_init();
     96 			INTON;
     97 
     98 			if (hist != NULL)
     99 				sethistsize(histsizeval());
    100 			else
    101 				out2str("sh: can't initialize history\n");
    102 		}
    103 		if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
    104 			/*
    105 			 * turn editing on
    106 			 */
    107 			INTOFF;
    108 			if (el_in == NULL)
    109 				el_in = fdopen(0, "r");
    110 			if (el_out == NULL)
    111 				el_out = fdopen(2, "w");
    112 			if (el_in == NULL || el_out == NULL)
    113 				goto bad;
    114 			el = el_init(arg0, el_in, el_out);
    115 			if (el != NULL) {
    116 				if (hist)
    117 					el_set(el, EL_HIST, history, hist);
    118 				el_set(el, EL_PROMPT, getprompt);
    119 			} else {
    120 bad:
    121 				out2str("sh: can't initialize editing\n");
    122 			}
    123 			INTON;
    124 		} else if (!editing && el) {
    125 			INTOFF;
    126 			el_end(el);
    127 			el = NULL;
    128 			INTON;
    129 		}
    130 		if (el) {
    131 			if (Vflag)
    132 				el_set(el, EL_EDITOR, "vi");
    133 			else if (Eflag)
    134 				el_set(el, EL_EDITOR, "emacs");
    135 		}
    136 	} else {
    137 		INTOFF;
    138 		if (el) {	/* no editing if not interactive */
    139 			el_end(el);
    140 			el = NULL;
    141 		}
    142 		if (hist) {
    143 			history_end(hist);
    144 			hist = NULL;
    145 		}
    146 		INTON;
    147 	}
    148 }
    149 
    150 
    151 void
    152 sethistsize(hs)
    153 	const char *hs;
    154 {
    155 	int histsize;
    156 
    157 	if (hist != NULL) {
    158 		if (hs == NULL || *hs == '\0' ||
    159 		   (histsize = atoi(hs)) < 0)
    160 			histsize = 100;
    161 		history(hist, H_EVENT, histsize);
    162 	}
    163 }
    164 
    165 void
    166 setterm(term)
    167 	const char *term;
    168 {
    169 	if (el != NULL && term != NULL)
    170 		if (el_set(el, EL_TERMINAL, term) != 0) {
    171 			outfmt(out2, "sh: Can't set terminal type %s\n", term);
    172 			outfmt(out2, "sh: Using dumb terminal settings.\n");
    173 		}
    174 }
    175 
    176 /*
    177  *  This command is provided since POSIX decided to standardize
    178  *  the Korn shell fc command.  Oh well...
    179  */
    180 int
    181 histcmd(argc, argv)
    182 	int argc;
    183 	char **argv;
    184 {
    185 	extern char *optarg;
    186 	extern int optind, optopt, optreset;
    187 	int ch;
    188 	char *editor = NULL;
    189 	const HistEvent *he;
    190 	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
    191 	int i;
    192 	char *firststr, *laststr;
    193 	int first, last, direction;
    194 	char *pat = NULL, *repl;	/* ksh "fc old=new" crap */
    195 	static int active = 0;
    196 	struct jmploc jmploc;
    197 	struct jmploc *volatile savehandler;
    198 	char editfile[MAXPATHLEN + 1];
    199 	FILE *efp;
    200 #ifdef __GNUC__
    201 	/* Avoid longjmp clobbering */
    202 	(void) &editor;
    203 	(void) &lflg;
    204 	(void) &nflg;
    205 	(void) &rflg;
    206 	(void) &sflg;
    207 	(void) &firststr;
    208 	(void) &laststr;
    209 	(void) &pat;
    210 	(void) &repl;
    211 	(void) &efp;
    212 	(void) &argc;
    213 	(void) &argv;
    214 #endif
    215 
    216 	if (hist == NULL)
    217 		error("history not active");
    218 
    219 	if (argc == 1)
    220 		error("missing history argument");
    221 
    222 	optreset = 1; optind = 1; /* initialize getopt */
    223 	while (not_fcnumber(argv[optind]) &&
    224 	      (ch = getopt(argc, argv, ":e:lnrs")) != -1)
    225 		switch ((char)ch) {
    226 		case 'e':
    227 			editor = optarg;
    228 			break;
    229 		case 'l':
    230 			lflg = 1;
    231 			break;
    232 		case 'n':
    233 			nflg = 1;
    234 			break;
    235 		case 'r':
    236 			rflg = 1;
    237 			break;
    238 		case 's':
    239 			sflg = 1;
    240 			break;
    241 		case ':':
    242 			error("option -%c expects argument", optopt);
    243 		case '?':
    244 		default:
    245 			error("unknown option: -%c", optopt);
    246 		}
    247 	argc -= optind, argv += optind;
    248 
    249 	/*
    250 	 * If executing...
    251 	 */
    252 	if (lflg == 0 || editor || sflg) {
    253 		lflg = 0;	/* ignore */
    254 		editfile[0] = '\0';
    255 		/*
    256 		 * Catch interrupts to reset active counter and
    257 		 * cleanup temp files.
    258 		 */
    259 		if (setjmp(jmploc.loc)) {
    260 			active = 0;
    261 			if (*editfile)
    262 				unlink(editfile);
    263 			handler = savehandler;
    264 			longjmp(handler->loc, 1);
    265 		}
    266 		savehandler = handler;
    267 		handler = &jmploc;
    268 		if (++active > MAXHISTLOOPS) {
    269 			active = 0;
    270 			displayhist = 0;
    271 			error("called recursively too many times");
    272 		}
    273 		/*
    274 		 * Set editor.
    275 		 */
    276 		if (sflg == 0) {
    277 			if (editor == NULL &&
    278 			    (editor = bltinlookup("FCEDIT", 1)) == NULL &&
    279 			    (editor = bltinlookup("EDITOR", 1)) == NULL)
    280 				editor = DEFEDITOR;
    281 			if (editor[0] == '-' && editor[1] == '\0') {
    282 				sflg = 1;	/* no edit */
    283 				editor = NULL;
    284 			}
    285 		}
    286 	}
    287 
    288 	/*
    289 	 * If executing, parse [old=new] now
    290 	 */
    291 	if (lflg == 0 && argc > 0 &&
    292 	     ((repl = strchr(argv[0], '=')) != NULL)) {
    293 		pat = argv[0];
    294 		*repl++ = '\0';
    295 		argc--, argv++;
    296 	}
    297 	/*
    298 	 * determine [first] and [last]
    299 	 */
    300 	switch (argc) {
    301 	case 0:
    302 		firststr = lflg ? "-16" : "-1";
    303 		laststr = "-1";
    304 		break;
    305 	case 1:
    306 		firststr = argv[0];
    307 		laststr = lflg ? "-1" : argv[0];
    308 		break;
    309 	case 2:
    310 		firststr = argv[0];
    311 		laststr = argv[1];
    312 		break;
    313 	default:
    314 		error("too many args");
    315 	}
    316 	/*
    317 	 * Turn into event numbers.
    318 	 */
    319 	first = str_to_event(firststr, 0);
    320 	last = str_to_event(laststr, 1);
    321 
    322 	if (rflg) {
    323 		i = last;
    324 		last = first;
    325 		first = i;
    326 	}
    327 	/*
    328 	 * XXX - this should not depend on the event numbers
    329 	 * always increasing.  Add sequence numbers or offset
    330 	 * to the history element in next (diskbased) release.
    331 	 */
    332 	direction = first < last ? H_PREV : H_NEXT;
    333 
    334 	/*
    335 	 * If editing, grab a temp file.
    336 	 */
    337 	if (editor) {
    338 		int fd;
    339 		INTOFF;		/* easier */
    340 		sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
    341 		if ((fd = mkstemp(editfile)) < 0)
    342 			error("can't create temporary file %s", editfile);
    343 		if ((efp = fdopen(fd, "w")) == NULL) {
    344 			close(fd);
    345 			error("can't allocate stdio buffer for temp");
    346 		}
    347 	}
    348 
    349 	/*
    350 	 * Loop through selected history events.  If listing or executing,
    351 	 * do it now.  Otherwise, put into temp file and call the editor
    352 	 * after.
    353 	 *
    354 	 * The history interface needs rethinking, as the following
    355 	 * convolutions will demonstrate.
    356 	 */
    357 	history(hist, H_FIRST);
    358 	he = history(hist, H_NEXT_EVENT, first);
    359 	for (;he != NULL; he = history(hist, direction)) {
    360 		if (lflg) {
    361 			if (!nflg)
    362 				out1fmt("%5d ", he->num);
    363 			out1str(he->str);
    364 		} else {
    365 			char *s = pat ?
    366 			   fc_replace(he->str, pat, repl) : (char *)he->str;
    367 
    368 			if (sflg) {
    369 				if (displayhist) {
    370 					out2str(s);
    371 				}
    372 				evalstring(s);
    373 				if (displayhist && hist) {
    374 					/*
    375 					 *  XXX what about recursive and
    376 					 *  relative histnums.
    377 					 */
    378 					history(hist, H_ENTER, s);
    379 				}
    380 			} else
    381 				fputs(s, efp);
    382 		}
    383 		/*
    384 		 * At end?  (if we were to loose last, we'd sure be
    385 		 * messed up).
    386 		 */
    387 		if (he->num == last)
    388 			break;
    389 	}
    390 	if (editor) {
    391 		char *editcmd;
    392 
    393 		fclose(efp);
    394 		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
    395 		sprintf(editcmd, "%s %s", editor, editfile);
    396 		evalstring(editcmd);	/* XXX - should use no JC command */
    397 		INTON;
    398 		readcmdfile(editfile);	/* XXX - should read back - quick tst */
    399 		unlink(editfile);
    400 	}
    401 
    402 	if (lflg == 0 && active > 0)
    403 		--active;
    404 	if (displayhist)
    405 		displayhist = 0;
    406 	return 0;
    407 }
    408 
    409 STATIC char *
    410 fc_replace(s, p, r)
    411 	const char *s;
    412 	char *p, *r;
    413 {
    414 	char *dest;
    415 	int plen = strlen(p);
    416 
    417 	STARTSTACKSTR(dest);
    418 	while (*s) {
    419 		if (*s == *p && strncmp(s, p, plen) == 0) {
    420 			while (*r)
    421 				STPUTC(*r++, dest);
    422 			s += plen;
    423 			*p = '\0';	/* so no more matches */
    424 		} else
    425 			STPUTC(*s++, dest);
    426 	}
    427 	STACKSTRNUL(dest);
    428 	dest = grabstackstr(dest);
    429 
    430 	return (dest);
    431 }
    432 
    433 int
    434 not_fcnumber(s)
    435         char *s;
    436 {
    437 	if (s == NULL)
    438 		return 0;
    439         if (*s == '-')
    440                 s++;
    441 	return (!is_number(s));
    442 }
    443 
    444 int
    445 str_to_event(str, last)
    446 	char *str;
    447 	int last;
    448 {
    449 	const HistEvent *he;
    450 	char *s = str;
    451 	int relative = 0;
    452 	int i;
    453 
    454 	he = history(hist, H_FIRST);
    455 	switch (*s) {
    456 	case '-':
    457 		relative = 1;
    458 		/*FALLTHROUGH*/
    459 	case '+':
    460 		s++;
    461 	}
    462 	if (is_number(s)) {
    463 		i = atoi(s);
    464 		if (relative) {
    465 			while (he != NULL && i--) {
    466 				he = history(hist, H_NEXT);
    467 			}
    468 			if (he == NULL)
    469 				he = history(hist, H_LAST);
    470 		} else {
    471 			he = history(hist, H_NEXT_EVENT, i);
    472 			if (he == NULL) {
    473 				/*
    474 				 * the notion of first and last is
    475 				 * backwards to that of the history package
    476 				 */
    477 				he = history(hist, last ? H_FIRST : H_LAST);
    478 			}
    479 		}
    480 		if (he == NULL)
    481 			error("history number %s not found (internal error)",
    482 			       str);
    483 	} else {
    484 		/*
    485 		 * pattern
    486 		 */
    487 		he = history(hist, H_PREV_STR, str);
    488 		if (he == NULL)
    489 			error("history pattern not found: %s", str);
    490 	}
    491 	return (he->num);
    492 }
    493 #else
    494 int
    495 histcmd(argc, argv)
    496 	int argc;
    497 	char **argv;
    498 {
    499 	error("not compiled with history support");
    500 }
    501 #endif
    502