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histedit.c revision 1.4 
      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 
     37 #ifndef lint
     38 /*static char sccsid[] = "from: @(#)histedit.c	8.1 (Berkeley) 5/31/93";*/
     39 static char *rcsid = "$Id: histedit.c,v 1.4 1994/12/04 07:12:13 cgd Exp $";
     40 #endif /* not lint */
     41 
     42 /*
     43  * Editline and history functions (and glue).
     44  */
     45 #include <sys/param.h>
     46 #include <paths.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <unistd.h>
     50 #include "shell.h"
     51 #include "parser.h"
     52 #include "var.h"
     53 #include "options.h"
     54 #include "output.h"
     55 #include "mystring.h"
     56 #include "error.h"
     57 #include "histedit.h"
     58 #include "memalloc.h"
     59 #include "extern.h"
     60 
     61 #define MAXHISTLOOPS	4	/* max recursions through fc */
     62 #define DEFEDITOR	"ed"	/* default editor *should* be $EDITOR */
     63 
     64 History *hist;	/* history cookie */
     65 EditLine *el;	/* editline cookie */
     66 int displayhist;
     67 static FILE *el_in, *el_out;
     68 
     69 STATIC char *fc_replace __P((const char *, char *, char *));
     70 int not_fcnumber __P((char *));
     71 int str_to_event __P((char *, int));
     72 
     73 /*
     74  * Set history and editing status.  Called whenever the status may
     75  * have changed (figures out what to do).
     76  */
     77 histedit()
     78 {
     79 
     80 #define editing (Eflag || Vflag)
     81 
     82 	if (iflag) {
     83 		if (!hist) {
     84 			/*
     85 			 * turn history on
     86 			 */
     87 			INTOFF;
     88 			hist = history_init();
     89 			INTON;
     90 
     91 			if (hist != NULL)
     92 				sethistsize();
     93 			else
     94 				out2str("sh: can't initialize history\n");
     95 		}
     96 		if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
     97 			/*
     98 			 * turn editing on
     99 			 */
    100 			INTOFF;
    101 			if (el_in == NULL)
    102 				el_in = fdopen(0, "r");
    103 			if (el_out == NULL)
    104 				el_out = fdopen(2, "w");
    105 			if (el_in == NULL || el_out == NULL)
    106 				goto bad;
    107 			el = el_init(arg0, el_in, el_out);
    108 			if (el != NULL) {
    109 				if (hist)
    110 					el_set(el, EL_HIST, history, hist);
    111 				el_set(el, EL_PROMPT, getprompt);
    112 			} else {
    113 bad:
    114 				out2str("sh: can't initialize editing\n");
    115 			}
    116 			INTON;
    117 		} else if (!editing && el) {
    118 			INTOFF;
    119 			el_end(el);
    120 			el = NULL;
    121 			INTON;
    122 		}
    123 		if (el) {
    124 			if (Vflag)
    125 				el_set(el, EL_EDITOR, "vi");
    126 			else if (Eflag)
    127 				el_set(el, EL_EDITOR, "emacs");
    128 		}
    129 	} else {
    130 		INTOFF;
    131 		if (el) {	/* no editing if not interactive */
    132 			el_end(el);
    133 			el = NULL;
    134 		}
    135 		if (hist) {
    136 			history_end(hist);
    137 			hist = NULL;
    138 		}
    139 		INTON;
    140 	}
    141 }
    142 
    143 
    144 void
    145 sethistsize() {
    146 	char *cp;
    147 	int histsize;
    148 
    149 	if (hist != NULL) {
    150 		cp = lookupvar("HISTSIZE");
    151 		if (cp == NULL || *cp == '\0' ||
    152 		   (histsize = atoi(cp)) < 0)
    153 			histsize = 100;
    154 		history(hist, H_EVENT, histsize);
    155 	}
    156 }
    157 
    158 /*
    159  *  This command is provided since POSIX decided to standardize
    160  *  the Korn shell fc command.  Oh well...
    161  */
    162 int
    163 histcmd(argc, argv)
    164 	int argc;
    165 	char *argv[];
    166 {
    167 	extern char *optarg;
    168 	extern int optind, optopt, optreset;
    169 	int ch;
    170 	char *editor = NULL;
    171 	const HistEvent *he;
    172 	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
    173 	int i;
    174 	char *firststr, *laststr;
    175 	int first, last, direction;
    176 	char *pat = NULL, *repl;	/* ksh "fc old=new" crap */
    177 	static int active = 0;
    178 	struct jmploc jmploc;
    179 	struct jmploc *volatile savehandler;
    180 	char editfile[MAXPATHLEN + 1];
    181 	FILE *efp;
    182 
    183 	if (hist == NULL)
    184 		error("history not active");
    185 
    186 	if (argc == 1)
    187 		error("missing history argument");
    188 
    189 	optreset = 1; optind = 1; /* initialize getopt */
    190 	while (not_fcnumber(argv[optind]) &&
    191 	      (ch = getopt(argc, argv, ":e:lnrs")) != EOF)
    192 		switch ((char)ch) {
    193 		case 'e':
    194 			editor = optarg;
    195 			break;
    196 		case 'l':
    197 			lflg = 1;
    198 			break;
    199 		case 'n':
    200 			nflg = 1;
    201 			break;
    202 		case 'r':
    203 			rflg = 1;
    204 			break;
    205 		case 's':
    206 			sflg = 1;
    207 			break;
    208 		case ':':
    209 			error("option -%c expects argument", optopt);
    210 		case '?':
    211 		default:
    212 			error("unknown option: -%c", optopt);
    213 		}
    214 	argc -= optind, argv += optind;
    215 
    216 	/*
    217 	 * If executing...
    218 	 */
    219 	if (lflg == 0 || editor || sflg) {
    220 		lflg = 0;	/* ignore */
    221 		editfile[0] = '\0';
    222 		/*
    223 		 * Catch interrupts to reset active counter and
    224 		 * cleanup temp files.
    225 		 */
    226 		if (setjmp(jmploc.loc)) {
    227 			active = 0;
    228 			if (*editfile)
    229 				unlink(editfile);
    230 			handler = savehandler;
    231 			longjmp(handler->loc, 1);
    232 		}
    233 		savehandler = handler;
    234 		handler = &jmploc;
    235 		if (++active > MAXHISTLOOPS) {
    236 			active = 0;
    237 			displayhist = 0;
    238 			error("called recursively too many times");
    239 		}
    240 		/*
    241 		 * Set editor.
    242 		 */
    243 		if (sflg == 0) {
    244 			if (editor == NULL &&
    245 			    (editor = bltinlookup("FCEDIT", 1)) == NULL &&
    246 			    (editor = bltinlookup("EDITOR", 1)) == NULL)
    247 				editor = DEFEDITOR;
    248 			if (editor[0] == '-' && editor[1] == '\0') {
    249 				sflg = 1;	/* no edit */
    250 				editor = NULL;
    251 			}
    252 		}
    253 	}
    254 
    255 	/*
    256 	 * If executing, parse [old=new] now
    257 	 */
    258 	if (lflg == 0 && argc > 0 &&
    259 	     ((repl = strchr(argv[0], '=')) != NULL)) {
    260 		pat = argv[0];
    261 		*repl++ = '\0';
    262 		argc--, argv++;
    263 	}
    264 	/*
    265 	 * determine [first] and [last]
    266 	 */
    267 	switch (argc) {
    268 	case 0:
    269 		firststr = lflg ? "-16" : "-1";
    270 		laststr = "-1";
    271 		break;
    272 	case 1:
    273 		firststr = argv[0];
    274 		laststr = lflg ? "-1" : argv[0];
    275 		break;
    276 	case 2:
    277 		firststr = argv[0];
    278 		laststr = argv[1];
    279 		break;
    280 	default:
    281 		error("too many args");
    282 	}
    283 	/*
    284 	 * Turn into event numbers.
    285 	 */
    286 	first = str_to_event(firststr, 0);
    287 	last = str_to_event(laststr, 1);
    288 
    289 	if (rflg) {
    290 		i = last;
    291 		last = first;
    292 		first = i;
    293 	}
    294 	/*
    295 	 * XXX - this should not depend on the event numbers
    296 	 * always increasing.  Add sequence numbers or offset
    297 	 * to the history element in next (diskbased) release.
    298 	 */
    299 	direction = first < last ? H_PREV : H_NEXT;
    300 
    301 	/*
    302 	 * If editing, grab a temp file.
    303 	 */
    304 	if (editor) {
    305 		int fd;
    306 		INTOFF;		/* easier */
    307 		sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
    308 		if ((fd = mkstemp(editfile)) < 0)
    309 			error("can't create temporary file %s", editfile);
    310 		if ((efp = fdopen(fd, "w")) == NULL) {
    311 			close(fd);
    312 			error("can't allocate stdio buffer for temp\n");
    313 		}
    314 	}
    315 
    316 	/*
    317 	 * Loop through selected history events.  If listing or executing,
    318 	 * do it now.  Otherwise, put into temp file and call the editor
    319 	 * after.
    320 	 *
    321 	 * The history interface needs rethinking, as the following
    322 	 * convolutions will demonstrate.
    323 	 */
    324 	history(hist, H_FIRST);
    325 	he = history(hist, H_NEXT_EVENT, first);
    326 	for (;he != NULL; he = history(hist, direction)) {
    327 		if (lflg) {
    328 			if (!nflg)
    329 				out1fmt("%5d ", he->num);
    330 			out1str(he->str);
    331 		} else {
    332 			char *s = pat ?
    333 			   fc_replace(he->str, pat, repl) : (char *)he->str;
    334 
    335 			if (sflg) {
    336 				if (displayhist) {
    337 					out2str(s);
    338 				}
    339 				evalstring(s);
    340 				if (displayhist && hist) {
    341 					/*
    342 					 *  XXX what about recursive and
    343 					 *  relative histnums.
    344 					 */
    345 					history(hist, H_ENTER, s);
    346 				}
    347 			} else
    348 				fputs(s, efp);
    349 		}
    350 		/*
    351 		 * At end?  (if we were to loose last, we'd sure be
    352 		 * messed up).
    353 		 */
    354 		if (he->num == last)
    355 			break;
    356 	}
    357 	if (editor) {
    358 		char *editcmd;
    359 
    360 		fclose(efp);
    361 		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
    362 		sprintf(editcmd, "%s %s", editor, editfile);
    363 		evalstring(editcmd);	/* XXX - should use no JC command */
    364 		INTON;
    365 		readcmdfile(editfile);	/* XXX - should read back - quick tst */
    366 		unlink(editfile);
    367 	}
    368 
    369 	if (lflg == 0 && active > 0)
    370 		--active;
    371 	if (displayhist)
    372 		displayhist = 0;
    373 }
    374 
    375 STATIC char *
    376 fc_replace(s, p, r)
    377 	const char *s;
    378 	char *p, *r;
    379 {
    380 	char *dest;
    381 	int plen = strlen(p);
    382 
    383 	STARTSTACKSTR(dest);
    384 	while (*s) {
    385 		if (*s == *p && strncmp(s, p, plen) == 0) {
    386 			while (*r)
    387 				STPUTC(*r++, dest);
    388 			s += plen;
    389 			*p = '\0';	/* so no more matches */
    390 		} else
    391 			STPUTC(*s++, dest);
    392 	}
    393 	STACKSTRNUL(dest);
    394 	dest = grabstackstr(dest);
    395 
    396 	return (dest);
    397 }
    398 
    399 int
    400 not_fcnumber(s)
    401         char *s;
    402 {
    403         if (*s == '-')
    404                 s++;
    405 	return (!is_number(s));
    406 }
    407 
    408 int
    409 str_to_event(str, last)
    410 	char *str;
    411 	int last;
    412 {
    413 	const HistEvent *he;
    414 	char *s = str;
    415 	int relative = 0;
    416 	int i;
    417 
    418 	he = history(hist, H_FIRST);
    419 	switch (*s) {
    420 	case '-':
    421 		relative = 1;
    422 		/*FALLTHROUGH*/
    423 	case '+':
    424 		s++;
    425 	}
    426 	if (is_number(s)) {
    427 		i = atoi(s);
    428 		if (relative) {
    429 			while (he != NULL && i--) {
    430 				he = history(hist, H_NEXT);
    431 			}
    432 			if (he == NULL)
    433 				he = history(hist, H_LAST);
    434 		} else {
    435 			he = history(hist, H_NEXT_EVENT, i);
    436 			if (he == NULL) {
    437 				/*
    438 				 * the notion of first and last is
    439 				 * backwards to that of the history package
    440 				 */
    441 				he = history(hist, last ? H_FIRST : H_LAST);
    442 			}
    443 		}
    444 		if (he == NULL)
    445 			error("history number %s not found (internal error)",
    446 			       str);
    447 	} else {
    448 		/*
    449 		 * pattern
    450 		 */
    451 		he = history(hist, H_PREV_STR, str);
    452 		if (he == NULL)
    453 			error("history pattern not found: %s", str);
    454 	}
    455 	return (he->num);
    456 }
    457