xref: /csrg-svn/bin/sh/histedit.c (revision 69272)
160705Sbostic /*-
260706Sbostic  * Copyright (c) 1993
360706Sbostic  *	The Regents of the University of California.  All rights reserved.
460705Sbostic  *
560705Sbostic  * This code is derived from software contributed to Berkeley by
660705Sbostic  * Kenneth Almquist.
760705Sbostic  *
860705Sbostic  * %sccs.include.redist.c%
960705Sbostic  */
1060705Sbostic 
1160705Sbostic #ifndef lint
12*69272Schristos static char sccsid[] = "@(#)histedit.c	8.2 (Berkeley) 05/04/95";
1360705Sbostic #endif /* not lint */
1460705Sbostic 
15*69272Schristos #include <sys/param.h>
16*69272Schristos #include <paths.h>
17*69272Schristos #include <stdio.h>
18*69272Schristos #include <stdlib.h>
19*69272Schristos #include <unistd.h>
2053861Smarc /*
2153861Smarc  * Editline and history functions (and glue).
2253861Smarc  */
2355242Smarc #include "shell.h"
2453861Smarc #include "parser.h"
2555242Smarc #include "var.h"
2653861Smarc #include "options.h"
27*69272Schristos #include "main.h"
28*69272Schristos #include "output.h"
2955242Smarc #include "mystring.h"
30*69272Schristos #ifndef NO_HISTORY
31*69272Schristos #include "myhistedit.h"
32*69272Schristos #endif
3353861Smarc #include "error.h"
34*69272Schristos #include "eval.h"
3555242Smarc #include "memalloc.h"
3653861Smarc 
3755242Smarc #define MAXHISTLOOPS	4	/* max recursions through fc */
3855242Smarc #define DEFEDITOR	"ed"	/* default editor *should* be $EDITOR */
3955242Smarc 
4053861Smarc History *hist;	/* history cookie */
4153861Smarc EditLine *el;	/* editline cookie */
4255242Smarc int displayhist;
4353861Smarc static FILE *el_in, *el_out;
4453861Smarc 
4555242Smarc STATIC char *fc_replace __P((const char *, char *, char *));
4653861Smarc 
4753861Smarc /*
4853861Smarc  * Set history and editing status.  Called whenever the status may
4953861Smarc  * have changed (figures out what to do).
5053861Smarc  */
51*69272Schristos void
histedit()52*69272Schristos histedit()
53*69272Schristos {
5453861Smarc 
5555242Smarc #define editing (Eflag || Vflag)
5655242Smarc 
5755242Smarc 	if (iflag) {
5853861Smarc 		if (!hist) {
5953861Smarc 			/*
6053861Smarc 			 * turn history on
6153861Smarc 			 */
6253861Smarc 			INTOFF;
6353861Smarc 			hist = history_init();
6453861Smarc 			INTON;
6553861Smarc 
6653861Smarc 			if (hist != NULL)
6753861Smarc 				sethistsize();
6853861Smarc 			else
6953861Smarc 				out2str("sh: can't initialize history\n");
7053861Smarc 		}
7155242Smarc 		if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
7253861Smarc 			/*
7353861Smarc 			 * turn editing on
7453861Smarc 			 */
7553861Smarc 			INTOFF;
7653861Smarc 			if (el_in == NULL)
7753861Smarc 				el_in = fdopen(0, "r");
7853861Smarc 			if (el_out == NULL)
7953861Smarc 				el_out = fdopen(2, "w");
8053861Smarc 			if (el_in == NULL || el_out == NULL)
8153861Smarc 				goto bad;
8253861Smarc 			el = el_init(arg0, el_in, el_out);
8353861Smarc 			if (el != NULL) {
8453861Smarc 				if (hist)
8555242Smarc 					el_set(el, EL_HIST, history, hist);
8653861Smarc 				el_set(el, EL_PROMPT, getprompt);
8753861Smarc 			} else {
8853861Smarc bad:
8953861Smarc 				out2str("sh: can't initialize editing\n");
9053861Smarc 			}
9153861Smarc 			INTON;
9255242Smarc 		} else if (!editing && el) {
9353861Smarc 			INTOFF;
9453861Smarc 			el_end(el);
9553861Smarc 			el = NULL;
9653861Smarc 			INTON;
9753861Smarc 		}
9855242Smarc 		if (el) {
9955242Smarc 			if (Vflag)
10055242Smarc 				el_set(el, EL_EDITOR, "vi");
10155242Smarc 			else if (Eflag)
10255242Smarc 				el_set(el, EL_EDITOR, "emacs");
10355242Smarc 		}
10453861Smarc 	} else {
10553861Smarc 		INTOFF;
10653861Smarc 		if (el) {	/* no editing if not interactive */
10753861Smarc 			el_end(el);
10853861Smarc 			el = NULL;
10953861Smarc 		}
11053861Smarc 		if (hist) {
11153861Smarc 			history_end(hist);
11253861Smarc 			hist = NULL;
11353861Smarc 		}
11453861Smarc 		INTON;
11553861Smarc 	}
11653861Smarc }
11753861Smarc 
118*69272Schristos 
119*69272Schristos void
sethistsize()120*69272Schristos sethistsize()
121*69272Schristos {
12253861Smarc 	char *cp;
12353861Smarc 	int histsize;
12453861Smarc 
12553861Smarc 	if (hist != NULL) {
12653861Smarc 		cp = lookupvar("HISTSIZE");
12753861Smarc 		if (cp == NULL || *cp == '\0' ||
12853861Smarc 		   (histsize = atoi(cp)) < 0)
12953861Smarc 			histsize = 100;
13055242Smarc 		history(hist, H_EVENT, histsize);
13153861Smarc 	}
13253861Smarc }
13355242Smarc 
13455242Smarc /*
13555242Smarc  *  This command is provided since POSIX decided to standardize
13655242Smarc  *  the Korn shell fc command.  Oh well...
13755242Smarc  */
138*69272Schristos int
histcmd(argc,argv)13955242Smarc histcmd(argc, argv)
140*69272Schristos 	int argc;
141*69272Schristos 	char **argv;
14255242Smarc {
14355242Smarc 	extern char *optarg;
14455242Smarc 	extern int optind, optopt, optreset;
14555242Smarc 	int ch;
14655242Smarc 	char *editor = NULL;
14755242Smarc 	const HistEvent *he;
14855242Smarc 	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
14955242Smarc 	int i;
15055242Smarc 	char *firststr, *laststr;
15155242Smarc 	int first, last, direction;
15255242Smarc 	char *pat = NULL, *repl;	/* ksh "fc old=new" crap */
15355242Smarc 	static int active = 0;
15455242Smarc 	struct jmploc jmploc;
15555242Smarc 	struct jmploc *volatile savehandler;
15655242Smarc 	char editfile[MAXPATHLEN + 1];
15755242Smarc 	FILE *efp;
158*69272Schristos #ifdef __GNUC__
159*69272Schristos 	/* Avoid longjmp clobbering */
160*69272Schristos 	(void) &editor;
161*69272Schristos 	(void) &lflg;
162*69272Schristos 	(void) &nflg;
163*69272Schristos 	(void) &rflg;
164*69272Schristos 	(void) &sflg;
165*69272Schristos 	(void) &firststr;
166*69272Schristos 	(void) &laststr;
167*69272Schristos 	(void) &pat;
168*69272Schristos 	(void) &repl;
169*69272Schristos 	(void) &efp;
170*69272Schristos 	(void) &argc;
171*69272Schristos 	(void) &argv;
172*69272Schristos #endif
17355242Smarc 
17455242Smarc 	if (hist == NULL)
17555242Smarc 		error("history not active");
17656930Sbostic 
17756930Sbostic 	if (argc == 1)
17856930Sbostic 		error("missing history argument");
17955242Smarc 
18055242Smarc 	optreset = 1; optind = 1; /* initialize getopt */
18155242Smarc 	while (not_fcnumber(argv[optind]) &&
18255242Smarc 	      (ch = getopt(argc, argv, ":e:lnrs")) != EOF)
18355242Smarc 		switch ((char)ch) {
18455242Smarc 		case 'e':
18555242Smarc 			editor = optarg;
18655242Smarc 			break;
18755242Smarc 		case 'l':
18855242Smarc 			lflg = 1;
18955242Smarc 			break;
19055242Smarc 		case 'n':
19155242Smarc 			nflg = 1;
19255242Smarc 			break;
19355242Smarc 		case 'r':
19455242Smarc 			rflg = 1;
19555242Smarc 			break;
19655242Smarc 		case 's':
19755242Smarc 			sflg = 1;
19855242Smarc 			break;
19955242Smarc 		case ':':
20055242Smarc 			error("option -%c expects argument", optopt);
20155242Smarc 		case '?':
20255242Smarc 		default:
20355242Smarc 			error("unknown option: -%c", optopt);
20455242Smarc 		}
20555242Smarc 	argc -= optind, argv += optind;
20655242Smarc 
20755242Smarc 	/*
20855242Smarc 	 * If executing...
20955242Smarc 	 */
21055242Smarc 	if (lflg == 0 || editor || sflg) {
21155242Smarc 		lflg = 0;	/* ignore */
21255242Smarc 		editfile[0] = '\0';
21355242Smarc 		/*
21455242Smarc 		 * Catch interrupts to reset active counter and
21555242Smarc 		 * cleanup temp files.
21655242Smarc 		 */
21755242Smarc 		if (setjmp(jmploc.loc)) {
21855242Smarc 			active = 0;
21955242Smarc 			if (*editfile)
22055242Smarc 				unlink(editfile);
22155242Smarc 			handler = savehandler;
22255242Smarc 			longjmp(handler->loc, 1);
22355242Smarc 		}
22455242Smarc 		savehandler = handler;
22555242Smarc 		handler = &jmploc;
22655242Smarc 		if (++active > MAXHISTLOOPS) {
22755242Smarc 			active = 0;
22855242Smarc 			displayhist = 0;
22955242Smarc 			error("called recursively too many times");
23055242Smarc 		}
23155242Smarc 		/*
23255242Smarc 		 * Set editor.
23355242Smarc 		 */
23455242Smarc 		if (sflg == 0) {
23555242Smarc 			if (editor == NULL &&
23655246Smarc 			    (editor = bltinlookup("FCEDIT", 1)) == NULL &&
23755246Smarc 			    (editor = bltinlookup("EDITOR", 1)) == NULL)
23855242Smarc 				editor = DEFEDITOR;
23955242Smarc 			if (editor[0] == '-' && editor[1] == '\0') {
24055242Smarc 				sflg = 1;	/* no edit */
24155242Smarc 				editor = NULL;
24255242Smarc 			}
24355242Smarc 		}
24455242Smarc 	}
24555242Smarc 
24655242Smarc 	/*
24755242Smarc 	 * If executing, parse [old=new] now
24855242Smarc 	 */
24955242Smarc 	if (lflg == 0 && argc > 0 &&
25055242Smarc 	     ((repl = strchr(argv[0], '=')) != NULL)) {
25155242Smarc 		pat = argv[0];
25255242Smarc 		*repl++ = '\0';
25355242Smarc 		argc--, argv++;
25455242Smarc 	}
25555242Smarc 	/*
25655242Smarc 	 * determine [first] and [last]
25755242Smarc 	 */
25855242Smarc 	switch (argc) {
25955242Smarc 	case 0:
26055242Smarc 		firststr = lflg ? "-16" : "-1";
26155242Smarc 		laststr = "-1";
26255242Smarc 		break;
26355242Smarc 	case 1:
26455242Smarc 		firststr = argv[0];
26555242Smarc 		laststr = lflg ? "-1" : argv[0];
26655242Smarc 		break;
26755242Smarc 	case 2:
26855242Smarc 		firststr = argv[0];
26955242Smarc 		laststr = argv[1];
27055242Smarc 		break;
27155242Smarc 	default:
27255242Smarc 		error("too many args");
27355242Smarc 	}
27455242Smarc 	/*
27555242Smarc 	 * Turn into event numbers.
27655242Smarc 	 */
27755242Smarc 	first = str_to_event(firststr, 0);
27855242Smarc 	last = str_to_event(laststr, 1);
27955242Smarc 
28055242Smarc 	if (rflg) {
28155242Smarc 		i = last;
28255242Smarc 		last = first;
28355242Smarc 		first = i;
28455242Smarc 	}
28555242Smarc 	/*
28655242Smarc 	 * XXX - this should not depend on the event numbers
28755242Smarc 	 * always increasing.  Add sequence numbers or offset
28855242Smarc 	 * to the history element in next (diskbased) release.
28955242Smarc 	 */
29055242Smarc 	direction = first < last ? H_PREV : H_NEXT;
29155242Smarc 
29255242Smarc 	/*
29355242Smarc 	 * If editing, grab a temp file.
29455242Smarc 	 */
29555242Smarc 	if (editor) {
29655242Smarc 		int fd;
29755242Smarc 		INTOFF;		/* easier */
29855242Smarc 		sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
29955242Smarc 		if ((fd = mkstemp(editfile)) < 0)
30055242Smarc 			error("can't create temporary file %s", editfile);
30155242Smarc 		if ((efp = fdopen(fd, "w")) == NULL) {
30255242Smarc 			close(fd);
30355242Smarc 			error("can't allocate stdio buffer for temp\n");
30455242Smarc 		}
30555242Smarc 	}
30655242Smarc 
30755242Smarc 	/*
30855242Smarc 	 * Loop through selected history events.  If listing or executing,
30955242Smarc 	 * do it now.  Otherwise, put into temp file and call the editor
31055242Smarc 	 * after.
31155242Smarc 	 *
31255242Smarc 	 * The history interface needs rethinking, as the following
31355242Smarc 	 * convolutions will demonstrate.
31455242Smarc 	 */
31555242Smarc 	history(hist, H_FIRST);
31655242Smarc 	he = history(hist, H_NEXT_EVENT, first);
31755242Smarc 	for (;he != NULL; he = history(hist, direction)) {
31855242Smarc 		if (lflg) {
31955242Smarc 			if (!nflg)
32055242Smarc 				out1fmt("%5d ", he->num);
32155242Smarc 			out1str(he->str);
32255242Smarc 		} else {
32355242Smarc 			char *s = pat ?
32455242Smarc 			   fc_replace(he->str, pat, repl) : (char *)he->str;
32555242Smarc 
32655242Smarc 			if (sflg) {
32755242Smarc 				if (displayhist) {
32855242Smarc 					out2str(s);
32955242Smarc 				}
33055242Smarc 				evalstring(s);
33155242Smarc 				if (displayhist && hist) {
33255242Smarc 					/*
33355242Smarc 					 *  XXX what about recursive and
33455242Smarc 					 *  relative histnums.
33555242Smarc 					 */
33655242Smarc 					history(hist, H_ENTER, s);
33755242Smarc 				}
33855242Smarc 			} else
33955242Smarc 				fputs(s, efp);
34055242Smarc 		}
34155242Smarc 		/*
34255242Smarc 		 * At end?  (if we were to loose last, we'd sure be
34355242Smarc 		 * messed up).
34455242Smarc 		 */
34555242Smarc 		if (he->num == last)
34655242Smarc 			break;
34755242Smarc 	}
34855242Smarc 	if (editor) {
34955242Smarc 		char *editcmd;
35055242Smarc 
35155242Smarc 		fclose(efp);
35255242Smarc 		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
35355242Smarc 		sprintf(editcmd, "%s %s", editor, editfile);
35455242Smarc 		evalstring(editcmd);	/* XXX - should use no JC command */
35555242Smarc 		INTON;
35655242Smarc 		readcmdfile(editfile);	/* XXX - should read back - quick tst */
35755242Smarc 		unlink(editfile);
35855242Smarc 	}
35955242Smarc 
36055242Smarc 	if (lflg == 0 && active > 0)
36155242Smarc 		--active;
36255242Smarc 	if (displayhist)
36355242Smarc 		displayhist = 0;
364*69272Schristos 	return 0;
36555242Smarc }
36655242Smarc 
36755242Smarc STATIC char *
fc_replace(s,p,r)36855242Smarc fc_replace(s, p, r)
36955242Smarc 	const char *s;
37055242Smarc 	char *p, *r;
37155242Smarc {
37255242Smarc 	char *dest;
37355242Smarc 	int plen = strlen(p);
37455242Smarc 
37555242Smarc 	STARTSTACKSTR(dest);
37655242Smarc 	while (*s) {
37755242Smarc 		if (*s == *p && strncmp(s, p, plen) == 0) {
37855242Smarc 			while (*r)
37955242Smarc 				STPUTC(*r++, dest);
38055242Smarc 			s += plen;
38155242Smarc 			*p = '\0';	/* so no more matches */
38255242Smarc 		} else
38355242Smarc 			STPUTC(*s++, dest);
38455242Smarc 	}
38555242Smarc 	STACKSTRNUL(dest);
38655242Smarc 	dest = grabstackstr(dest);
38755242Smarc 
38855242Smarc 	return (dest);
38955242Smarc }
39055242Smarc 
391*69272Schristos int
not_fcnumber(s)39255242Smarc not_fcnumber(s)
39355242Smarc         char *s;
39455242Smarc {
395*69272Schristos 	if (s == NULL)
396*69272Schristos 		return 0;
39755242Smarc         if (*s == '-')
39855242Smarc                 s++;
39955242Smarc 	return (!is_number(s));
40055242Smarc }
40155242Smarc 
402*69272Schristos int
str_to_event(str,last)40355242Smarc str_to_event(str, last)
40455242Smarc 	char *str;
40555242Smarc 	int last;
40655242Smarc {
40755242Smarc 	const HistEvent *he;
40855242Smarc 	char *s = str;
40955242Smarc 	int relative = 0;
410*69272Schristos 	int i;
41155242Smarc 
41255242Smarc 	he = history(hist, H_FIRST);
41355242Smarc 	switch (*s) {
41455242Smarc 	case '-':
41555242Smarc 		relative = 1;
41655242Smarc 		/*FALLTHROUGH*/
41755242Smarc 	case '+':
41855242Smarc 		s++;
41955242Smarc 	}
42055242Smarc 	if (is_number(s)) {
42155242Smarc 		i = atoi(s);
42255242Smarc 		if (relative) {
42355242Smarc 			while (he != NULL && i--) {
42455242Smarc 				he = history(hist, H_NEXT);
42555242Smarc 			}
42655242Smarc 			if (he == NULL)
42755242Smarc 				he = history(hist, H_LAST);
42855242Smarc 		} else {
42955242Smarc 			he = history(hist, H_NEXT_EVENT, i);
43055242Smarc 			if (he == NULL) {
43155242Smarc 				/*
43255242Smarc 				 * the notion of first and last is
43355242Smarc 				 * backwards to that of the history package
43455242Smarc 				 */
43555242Smarc 				he = history(hist, last ? H_FIRST : H_LAST);
43655242Smarc 			}
43755242Smarc 		}
43855242Smarc 		if (he == NULL)
43955242Smarc 			error("history number %s not found (internal error)",
44055242Smarc 			       str);
44155242Smarc 	} else {
44255242Smarc 		/*
44355242Smarc 		 * pattern
44455242Smarc 		 */
44555298Smarc 		he = history(hist, H_PREV_STR, str);
44655242Smarc 		if (he == NULL)
44755242Smarc 			error("history pattern not found: %s", str);
44855242Smarc 	}
44955242Smarc 	return (he->num);
45055242Smarc }
451