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histedit.c revision 1.21 
      1 /*	$NetBSD: histedit.c,v 1.21 1999/07/09 03:05:50 christos 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 1.21 1999/07/09 03:05:50 christos 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 #include "myhistedit.h"
     64 #include "error.h"
     65 #ifndef SMALL
     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 const 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, 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 	HistEvent he;
    157 
    158 	if (hist != NULL) {
    159 		if (hs == NULL || *hs == '\0' ||
    160 		   (histsize = atoi(hs)) < 0)
    161 			histsize = 100;
    162 		history(hist, &he, H_SETSIZE, histsize);
    163 	}
    164 }
    165 
    166 void
    167 setterm(term)
    168 	const char *term;
    169 {
    170 	if (el != NULL && term != NULL)
    171 		if (el_set(el, EL_TERMINAL, term) != 0) {
    172 			outfmt(out2, "sh: Can't set terminal type %s\n", term);
    173 			outfmt(out2, "sh: Using dumb terminal settings.\n");
    174 		}
    175 }
    176 
    177 /*
    178  *  This command is provided since POSIX decided to standardize
    179  *  the Korn shell fc command.  Oh well...
    180  */
    181 int
    182 histcmd(argc, argv)
    183 	int argc;
    184 	char **argv;
    185 {
    186 	extern char *optarg;
    187 	extern int optind, optopt, optreset;
    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;	/* ksh "fc old=new" crap */
    196 	static int active = 0;
    197 	struct jmploc jmploc;
    198 	struct jmploc *volatile savehandler;
    199 	char editfile[MAXPATHLEN + 1];
    200 	FILE *efp;
    201 #ifdef __GNUC__
    202 	/* Avoid longjmp clobbering */
    203 	(void) &editor;
    204 	(void) &lflg;
    205 	(void) &nflg;
    206 	(void) &rflg;
    207 	(void) &sflg;
    208 	(void) &firststr;
    209 	(void) &laststr;
    210 	(void) &pat;
    211 	(void) &repl;
    212 	(void) &efp;
    213 	(void) &argc;
    214 	(void) &argv;
    215 #endif
    216 
    217 	if (hist == NULL)
    218 		error("history not active");
    219 
    220 	if (argc == 1)
    221 		error("missing history argument");
    222 
    223 	optreset = 1; optind = 1; /* initialize getopt */
    224 	while (not_fcnumber(argv[optind]) &&
    225 	      (ch = getopt(argc, argv, ":e:lnrs")) != -1)
    226 		switch ((char)ch) {
    227 		case 'e':
    228 			editor = optarg;
    229 			break;
    230 		case 'l':
    231 			lflg = 1;
    232 			break;
    233 		case 'n':
    234 			nflg = 1;
    235 			break;
    236 		case 'r':
    237 			rflg = 1;
    238 			break;
    239 		case 's':
    240 			sflg = 1;
    241 			break;
    242 		case ':':
    243 			error("option -%c expects argument", optopt);
    244 			/* NOTREACHED */
    245 		case '?':
    246 		default:
    247 			error("unknown option: -%c", optopt);
    248 			/* NOTREACHED */
    249 		}
    250 	argc -= optind, argv += optind;
    251 
    252 	/*
    253 	 * If executing...
    254 	 */
    255 	if (lflg == 0 || editor || sflg) {
    256 		lflg = 0;	/* ignore */
    257 		editfile[0] = '\0';
    258 		/*
    259 		 * Catch interrupts to reset active counter and
    260 		 * cleanup temp files.
    261 		 */
    262 		if (setjmp(jmploc.loc)) {
    263 			active = 0;
    264 			if (*editfile)
    265 				unlink(editfile);
    266 			handler = savehandler;
    267 			longjmp(handler->loc, 1);
    268 		}
    269 		savehandler = handler;
    270 		handler = &jmploc;
    271 		if (++active > MAXHISTLOOPS) {
    272 			active = 0;
    273 			displayhist = 0;
    274 			error("called recursively too many times");
    275 		}
    276 		/*
    277 		 * Set editor.
    278 		 */
    279 		if (sflg == 0) {
    280 			if (editor == NULL &&
    281 			    (editor = bltinlookup("FCEDIT", 1)) == NULL &&
    282 			    (editor = bltinlookup("EDITOR", 1)) == NULL)
    283 				editor = DEFEDITOR;
    284 			if (editor[0] == '-' && editor[1] == '\0') {
    285 				sflg = 1;	/* no edit */
    286 				editor = NULL;
    287 			}
    288 		}
    289 	}
    290 
    291 	/*
    292 	 * If executing, parse [old=new] now
    293 	 */
    294 	if (lflg == 0 && argc > 0 &&
    295 	     ((repl = strchr(argv[0], '=')) != NULL)) {
    296 		pat = argv[0];
    297 		*repl++ = '\0';
    298 		argc--, argv++;
    299 	}
    300 	/*
    301 	 * determine [first] and [last]
    302 	 */
    303 	switch (argc) {
    304 	case 0:
    305 		firststr = lflg ? "-16" : "-1";
    306 		laststr = "-1";
    307 		break;
    308 	case 1:
    309 		firststr = argv[0];
    310 		laststr = lflg ? "-1" : argv[0];
    311 		break;
    312 	case 2:
    313 		firststr = argv[0];
    314 		laststr = argv[1];
    315 		break;
    316 	default:
    317 		error("too many args");
    318 		/* NOTREACHED */
    319 	}
    320 	/*
    321 	 * Turn into event numbers.
    322 	 */
    323 	first = str_to_event(firststr, 0);
    324 	last = str_to_event(laststr, 1);
    325 
    326 	if (rflg) {
    327 		i = last;
    328 		last = first;
    329 		first = i;
    330 	}
    331 	/*
    332 	 * XXX - this should not depend on the event numbers
    333 	 * always increasing.  Add sequence numbers or offset
    334 	 * to the history element in next (diskbased) release.
    335 	 */
    336 	direction = first < last ? H_PREV : H_NEXT;
    337 
    338 	/*
    339 	 * If editing, grab a temp file.
    340 	 */
    341 	if (editor) {
    342 		int fd;
    343 		INTOFF;		/* easier */
    344 		sprintf(editfile, "%s_shXXXXXX", _PATH_TMP);
    345 		if ((fd = mkstemp(editfile)) < 0)
    346 			error("can't create temporary file %s", editfile);
    347 		if ((efp = fdopen(fd, "w")) == NULL) {
    348 			close(fd);
    349 			error("can't allocate stdio buffer for temp");
    350 		}
    351 	}
    352 
    353 	/*
    354 	 * Loop through selected history events.  If listing or executing,
    355 	 * do it now.  Otherwise, put into temp file and call the editor
    356 	 * after.
    357 	 *
    358 	 * The history interface needs rethinking, as the following
    359 	 * convolutions will demonstrate.
    360 	 */
    361 	history(hist, &he, H_FIRST);
    362 	retval = history(hist, &he, H_NEXT_EVENT, first);
    363 	for (;retval != -1; retval = history(hist, &he, direction)) {
    364 		if (lflg) {
    365 			if (!nflg)
    366 				out1fmt("%5d ", he.num);
    367 			out1str(he.str);
    368 		} else {
    369 			const char *s = pat ?
    370 			   fc_replace(he.str, pat, repl) : he.str;
    371 			char *sp;
    372 
    373 			if (sflg) {
    374 				if (displayhist) {
    375 					out2str(s);
    376 				}
    377 
    378 				evalstring(strcpy(stalloc(strlen(s) + 1), s));
    379 				free(sp);
    380 				if (displayhist && hist) {
    381 					/*
    382 					 *  XXX what about recursive and
    383 					 *  relative histnums.
    384 					 */
    385 					history(hist, &he, H_ENTER, s);
    386 				}
    387 			} else
    388 				fputs(s, efp);
    389 		}
    390 		/*
    391 		 * At end?  (if we were to lose last, we'd sure be
    392 		 * messed up).
    393 		 */
    394 		if (he.num == last)
    395 			break;
    396 	}
    397 	if (editor) {
    398 		char *editcmd;
    399 
    400 		fclose(efp);
    401 		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
    402 		sprintf(editcmd, "%s %s", editor, editfile);
    403 		evalstring(editcmd);	/* XXX - should use no JC command */
    404 		INTON;
    405 		readcmdfile(editfile);	/* XXX - should read back - quick tst */
    406 		unlink(editfile);
    407 	}
    408 
    409 	if (lflg == 0 && active > 0)
    410 		--active;
    411 	if (displayhist)
    412 		displayhist = 0;
    413 	return 0;
    414 }
    415 
    416 STATIC const char *
    417 fc_replace(s, p, r)
    418 	const char *s;
    419 	char *p, *r;
    420 {
    421 	char *dest;
    422 	int plen = strlen(p);
    423 
    424 	STARTSTACKSTR(dest);
    425 	while (*s) {
    426 		if (*s == *p && strncmp(s, p, plen) == 0) {
    427 			while (*r)
    428 				STPUTC(*r++, dest);
    429 			s += plen;
    430 			*p = '\0';	/* so no more matches */
    431 		} else
    432 			STPUTC(*s++, dest);
    433 	}
    434 	STACKSTRNUL(dest);
    435 	dest = grabstackstr(dest);
    436 
    437 	return (dest);
    438 }
    439 
    440 int
    441 not_fcnumber(s)
    442         char *s;
    443 {
    444 	if (s == NULL)
    445 		return 0;
    446         if (*s == '-')
    447                 s++;
    448 	return (!is_number(s));
    449 }
    450 
    451 int
    452 str_to_event(str, last)
    453 	const char *str;
    454 	int last;
    455 {
    456 	HistEvent he;
    457 	const char *s = str;
    458 	int relative = 0;
    459 	int i, retval;
    460 
    461 	retval = history(hist, &he, H_FIRST);
    462 	switch (*s) {
    463 	case '-':
    464 		relative = 1;
    465 		/*FALLTHROUGH*/
    466 	case '+':
    467 		s++;
    468 	}
    469 	if (is_number(s)) {
    470 		i = atoi(s);
    471 		if (relative) {
    472 			while (retval != -1 && i--) {
    473 				retval = history(hist, &he, H_NEXT);
    474 			}
    475 			if (retval == -1)
    476 				retval = history(hist, &he, H_LAST);
    477 		} else {
    478 			retval = history(hist, &he, H_NEXT_EVENT, i);
    479 			if (retval == -1) {
    480 				/*
    481 				 * the notion of first and last is
    482 				 * backwards to that of the history package
    483 				 */
    484 				retval = history(hist, &he,
    485 						last ? H_FIRST : H_LAST);
    486 			}
    487 		}
    488 		if (retval == -1)
    489 			error("history number %s not found (internal error)",
    490 			       str);
    491 	} else {
    492 		/*
    493 		 * pattern
    494 		 */
    495 		retval = history(hist, &he, H_PREV_STR, str);
    496 		if (retval == -1)
    497 			error("history pattern not found: %s", str);
    498 	}
    499 	return (he.num);
    500 }
    501 #else
    502 int
    503 histcmd(argc, argv)
    504 	int argc;
    505 	char **argv;
    506 {
    507 	error("not compiled with history support");
    508 	/* NOTREACHED */
    509 }
    510 #endif
    511