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histedit.c revision 1.1 
      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[] = "@(#)histedit.c	8.1 (Berkeley) 5/31/93";
     39 #endif /* not lint */
     40 
     41 /*
     42  * Editline and history functions (and glue).
     43  */
     44 #include <sys/param.h>
     45 #include <paths.h>
     46 #include <stdio.h>
     47 #include "shell.h"
     48 #include "parser.h"
     49 #include "var.h"
     50 #include "options.h"
     51 #include "mystring.h"
     52 #include "error.h"
     53 #include "histedit.h"
     54 #include "memalloc.h"
     55 
     56 #define MAXHISTLOOPS	4	/* max recursions through fc */
     57 #define DEFEDITOR	"ed"	/* default editor *should* be $EDITOR */
     58 
     59 History *hist;	/* history cookie */
     60 EditLine *el;	/* editline cookie */
     61 int displayhist;
     62 static FILE *el_in, *el_out;
     63 
     64 STATIC char *fc_replace __P((const char *, char *, char *));
     65 
     66 /*
     67  * Set history and editing status.  Called whenever the status may
     68  * have changed (figures out what to do).
     69  */
     70 histedit() {
     71 
     72 #define editing (Eflag || Vflag)
     73 
     74 	if (iflag) {
     75 		if (!hist) {
     76 			/*
     77 			 * turn history on
     78 			 */
     79 			INTOFF;
     80 			hist = history_init();
     81 			INTON;
     82 
     83 			if (hist != NULL)
     84 				sethistsize();
     85 			else
     86 				out2str("sh: can't initialize history\n");
     87 		}
     88 		if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
     89 			/*
     90 			 * turn editing on
     91 			 */
     92 			INTOFF;
     93 			if (el_in == NULL)
     94 				el_in = fdopen(0, "r");
     95 			if (el_out == NULL)
     96 				el_out = fdopen(2, "w");
     97 			if (el_in == NULL || el_out == NULL)
     98 				goto bad;
     99 			el = el_init(arg0, el_in, el_out);
    100 			if (el != NULL) {
    101 				if (hist)
    102 					el_set(el, EL_HIST, history, hist);
    103 				el_set(el, EL_PROMPT, getprompt);
    104 			} else {
    105 bad:
    106 				out2str("sh: can't initialize editing\n");
    107 			}
    108 			INTON;
    109 		} else if (!editing && el) {
    110 			INTOFF;
    111 			el_end(el);
    112 			el = NULL;
    113 			INTON;
    114 		}
    115 		if (el) {
    116 			if (Vflag)
    117 				el_set(el, EL_EDITOR, "vi");
    118 			else if (Eflag)
    119 				el_set(el, EL_EDITOR, "emacs");
    120 		}
    121 	} else {
    122 		INTOFF;
    123 		if (el) {	/* no editing if not interactive */
    124 			el_end(el);
    125 			el = NULL;
    126 		}
    127 		if (hist) {
    128 			history_end(hist);
    129 			hist = NULL;
    130 		}
    131 		INTON;
    132 	}
    133 }
    134 
    135 sethistsize() {
    136 	char *cp;
    137 	int histsize;
    138 
    139 	if (hist != NULL) {
    140 		cp = lookupvar("HISTSIZE");
    141 		if (cp == NULL || *cp == '\0' ||
    142 		   (histsize = atoi(cp)) < 0)
    143 			histsize = 100;
    144 		history(hist, H_EVENT, histsize);
    145 	}
    146 }
    147 
    148 /*
    149  *  This command is provided since POSIX decided to standardize
    150  *  the Korn shell fc command.  Oh well...
    151  */
    152 histcmd(argc, argv)
    153 	char *argv[];
    154 {
    155 	extern char *optarg;
    156 	extern int optind, optopt, optreset;
    157 	int ch;
    158 	char *editor = NULL;
    159 	const HistEvent *he;
    160 	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
    161 	int i;
    162 	char *firststr, *laststr;
    163 	int first, last, direction;
    164 	char *pat = NULL, *repl;	/* ksh "fc old=new" crap */
    165 	static int active = 0;
    166 	struct jmploc jmploc;
    167 	struct jmploc *volatile savehandler;
    168 	char editfile[MAXPATHLEN + 1];
    169 	FILE *efp;
    170 
    171 	if (hist == NULL)
    172 		error("history not active");
    173 
    174 	if (argc == 1)
    175 		error("missing history argument");
    176 
    177 	optreset = 1; optind = 1; /* initialize getopt */
    178 	while (not_fcnumber(argv[optind]) &&
    179 	      (ch = getopt(argc, argv, ":e:lnrs")) != EOF)
    180 		switch ((char)ch) {
    181 		case 'e':
    182 			editor = optarg;
    183 			break;
    184 		case 'l':
    185 			lflg = 1;
    186 			break;
    187 		case 'n':
    188 			nflg = 1;
    189 			break;
    190 		case 'r':
    191 			rflg = 1;
    192 			break;
    193 		case 's':
    194 			sflg = 1;
    195 			break;
    196 		case ':':
    197 			error("option -%c expects argument", optopt);
    198 		case '?':
    199 		default:
    200 			error("unknown option: -%c", optopt);
    201 		}
    202 	argc -= optind, argv += optind;
    203 
    204 	/*
    205 	 * If executing...
    206 	 */
    207 	if (lflg == 0 || editor || sflg) {
    208 		lflg = 0;	/* ignore */
    209 		editfile[0] = '\0';
    210 		/*
    211 		 * Catch interrupts to reset active counter and
    212 		 * cleanup temp files.
    213 		 */
    214 		if (setjmp(jmploc.loc)) {
    215 			active = 0;
    216 			if (*editfile)
    217 				unlink(editfile);
    218 			handler = savehandler;
    219 			longjmp(handler->loc, 1);
    220 		}
    221 		savehandler = handler;
    222 		handler = &jmploc;
    223 		if (++active > MAXHISTLOOPS) {
    224 			active = 0;
    225 			displayhist = 0;
    226 			error("called recursively too many times");
    227 		}
    228 		/*
    229 		 * Set editor.
    230 		 */
    231 		if (sflg == 0) {
    232 			if (editor == NULL &&
    233 			    (editor = bltinlookup("FCEDIT", 1)) == NULL &&
    234 			    (editor = bltinlookup("EDITOR", 1)) == NULL)
    235 				editor = DEFEDITOR;
    236 			if (editor[0] == '-' && editor[1] == '\0') {
    237 				sflg = 1;	/* no edit */
    238 				editor = NULL;
    239 			}
    240 		}
    241 	}
    242 
    243 	/*
    244 	 * If executing, parse [old=new] now
    245 	 */
    246 	if (lflg == 0 && argc > 0 &&
    247 	     ((repl = strchr(argv[0], '=')) != NULL)) {
    248 		pat = argv[0];
    249 		*repl++ = '\0';
    250 		argc--, argv++;
    251 	}
    252 	/*
    253 	 * determine [first] and [last]
    254 	 */
    255 	switch (argc) {
    256 	case 0:
    257 		firststr = lflg ? "-16" : "-1";
    258 		laststr = "-1";
    259 		break;
    260 	case 1:
    261 		firststr = argv[0];
    262 		laststr = lflg ? "-1" : argv[0];
    263 		break;
    264 	case 2:
    265 		firststr = argv[0];
    266 		laststr = argv[1];
    267 		break;
    268 	default:
    269 		error("too many args");
    270 	}
    271 	/*
    272 	 * Turn into event numbers.
    273 	 */
    274 	first = str_to_event(firststr, 0);
    275 	last = str_to_event(laststr, 1);
    276 
    277 	if (rflg) {
    278 		i = last;
    279 		last = first;
    280 		first = i;
    281 	}
    282 	/*
    283 	 * XXX - this should not depend on the event numbers
    284 	 * always increasing.  Add sequence numbers or offset
    285 	 * to the history element in next (diskbased) release.
    286 	 */
    287 	direction = first < last ? H_PREV : H_NEXT;
    288 
    289 	/*
    290 	 * If editing, grab a temp file.
    291 	 */
    292 	if (editor) {
    293 		int fd;
    294 		INTOFF;		/* easier */
    295 		sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
    296 		if ((fd = mkstemp(editfile)) < 0)
    297 			error("can't create temporary file %s", editfile);
    298 		if ((efp = fdopen(fd, "w")) == NULL) {
    299 			close(fd);
    300 			error("can't allocate stdio buffer for temp\n");
    301 		}
    302 	}
    303 
    304 	/*
    305 	 * Loop through selected history events.  If listing or executing,
    306 	 * do it now.  Otherwise, put into temp file and call the editor
    307 	 * after.
    308 	 *
    309 	 * The history interface needs rethinking, as the following
    310 	 * convolutions will demonstrate.
    311 	 */
    312 	history(hist, H_FIRST);
    313 	he = history(hist, H_NEXT_EVENT, first);
    314 	for (;he != NULL; he = history(hist, direction)) {
    315 		if (lflg) {
    316 			if (!nflg)
    317 				out1fmt("%5d ", he->num);
    318 			out1str(he->str);
    319 		} else {
    320 			char *s = pat ?
    321 			   fc_replace(he->str, pat, repl) : (char *)he->str;
    322 
    323 			if (sflg) {
    324 				if (displayhist) {
    325 					out2str(s);
    326 				}
    327 				evalstring(s);
    328 				if (displayhist && hist) {
    329 					/*
    330 					 *  XXX what about recursive and
    331 					 *  relative histnums.
    332 					 */
    333 					history(hist, H_ENTER, s);
    334 				}
    335 			} else
    336 				fputs(s, efp);
    337 		}
    338 		/*
    339 		 * At end?  (if we were to loose last, we'd sure be
    340 		 * messed up).
    341 		 */
    342 		if (he->num == last)
    343 			break;
    344 	}
    345 	if (editor) {
    346 		char *editcmd;
    347 
    348 		fclose(efp);
    349 		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
    350 		sprintf(editcmd, "%s %s", editor, editfile);
    351 		evalstring(editcmd);	/* XXX - should use no JC command */
    352 		INTON;
    353 		readcmdfile(editfile);	/* XXX - should read back - quick tst */
    354 		unlink(editfile);
    355 	}
    356 
    357 	if (lflg == 0 && active > 0)
    358 		--active;
    359 	if (displayhist)
    360 		displayhist = 0;
    361 }
    362 
    363 STATIC char *
    364 fc_replace(s, p, r)
    365 	const char *s;
    366 	char *p, *r;
    367 {
    368 	char *dest;
    369 	int plen = strlen(p);
    370 
    371 	STARTSTACKSTR(dest);
    372 	while (*s) {
    373 		if (*s == *p && strncmp(s, p, plen) == 0) {
    374 			while (*r)
    375 				STPUTC(*r++, dest);
    376 			s += plen;
    377 			*p = '\0';	/* so no more matches */
    378 		} else
    379 			STPUTC(*s++, dest);
    380 	}
    381 	STACKSTRNUL(dest);
    382 	dest = grabstackstr(dest);
    383 
    384 	return (dest);
    385 }
    386 
    387 not_fcnumber(s)
    388         char *s;
    389 {
    390         if (*s == '-')
    391                 s++;
    392 	return (!is_number(s));
    393 }
    394 
    395 str_to_event(str, last)
    396 	char *str;
    397 	int last;
    398 {
    399 	const HistEvent *he;
    400 	char *s = str;
    401 	int relative = 0;
    402 	int i, j;
    403 
    404 	he = history(hist, H_FIRST);
    405 	switch (*s) {
    406 	case '-':
    407 		relative = 1;
    408 		/*FALLTHROUGH*/
    409 	case '+':
    410 		s++;
    411 	}
    412 	if (is_number(s)) {
    413 		i = atoi(s);
    414 		if (relative) {
    415 			while (he != NULL && i--) {
    416 				he = history(hist, H_NEXT);
    417 			}
    418 			if (he == NULL)
    419 				he = history(hist, H_LAST);
    420 		} else {
    421 			he = history(hist, H_NEXT_EVENT, i);
    422 			if (he == NULL) {
    423 				/*
    424 				 * the notion of first and last is
    425 				 * backwards to that of the history package
    426 				 */
    427 				he = history(hist, last ? H_FIRST : H_LAST);
    428 			}
    429 		}
    430 		if (he == NULL)
    431 			error("history number %s not found (internal error)",
    432 			       str);
    433 	} else {
    434 		/*
    435 		 * pattern
    436 		 */
    437 		he = history(hist, H_PREV_STR, str);
    438 		if (he == NULL)
    439 			error("history pattern not found: %s", str);
    440 	}
    441 	return (he->num);
    442 }
    443