[unix-history] / usr / src / bin / sh / histedit.c

/*
 * Editline and history functions (and glue).
 */
#include <sys/param.h>
#include <paths.h>
#include <stdio.h>
#include "shell.h"
#include "parser.h"
#include "var.h"
#include "options.h"
#include "mystring.h"
#include "error.h"
#include "histedit.h"
#include "memalloc.h"

#define MAXHISTLOOPS	4	/* max recursions through fc */
#define DEFEDITOR	"ed"	/* default editor *should* be $EDITOR */

History *hist;	/* history cookie */
EditLine *el;	/* editline cookie */
int displayhist;
static FILE *el_in, *el_out;

STATIC char *fc_replace __P((const char *, char *, char *));

/*
 * Set history and editing status.  Called whenever the status may
 * have changed (figures out what to do).
 */
histedit() {

#define editing (Eflag || Vflag)

	if (iflag) {
		if (!hist) {
			/*
			 * turn history on
			 */
			INTOFF;
			hist = history_init();
			INTON;

			if (hist != NULL)
				sethistsize();
			else
				out2str("sh: can't initialize history\n");
		}
		if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
			/*
			 * turn editing on
			 */
			INTOFF;
			if (el_in == NULL)
				el_in = fdopen(0, "r");
			if (el_out == NULL)
				el_out = fdopen(2, "w");
			if (el_in == NULL || el_out == NULL)
				goto bad;
			el = el_init(arg0, el_in, el_out);
			if (el != NULL) {
				if (hist)
					el_set(el, EL_HIST, history, hist);
				el_set(el, EL_PROMPT, getprompt);
			} else {
bad:
				out2str("sh: can't initialize editing\n");
			}
			INTON;
		} else if (!editing && el) {
			INTOFF;
			el_end(el);
			el = NULL;
			INTON;
		}
		if (el) {
			if (Vflag)
				el_set(el, EL_EDITOR, "vi");
			else if (Eflag)
				el_set(el, EL_EDITOR, "emacs");
		}
	} else {
		INTOFF;
		if (el) {	/* no editing if not interactive */
			el_end(el);
			el = NULL;
		}
		if (hist) {
			history_end(hist);
			hist = NULL;
		}
		INTON;
	}
}

sethistsize() {
	char *cp;
	int histsize;

	if (hist != NULL) {
		cp = lookupvar("HISTSIZE");
		if (cp == NULL || *cp == '\0' || 
		   (histsize = atoi(cp)) < 0)
			histsize = 100;
		history(hist, H_EVENT, histsize);
	}
}

/*
 *  This command is provided since POSIX decided to standardize
 *  the Korn shell fc command.  Oh well...
 */
histcmd(argc, argv)
	char *argv[];
{
	extern char *optarg;
	extern int optind, optopt, optreset;
	int ch;
	char *editor = NULL;
	const HistEvent *he;
	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
	int i;
	char *firststr, *laststr;
	int first, last, direction;
	char *pat = NULL, *repl;	/* ksh "fc old=new" crap */
	static int active = 0;
	struct jmploc jmploc;
	struct jmploc *volatile savehandler;
	char editfile[MAXPATHLEN + 1];
	FILE *efp;

	if (hist == NULL)
		error("history not active");
	
	if (argc == 1)
		error("missing history argument");

	optreset = 1; optind = 1; /* initialize getopt */
	while (not_fcnumber(argv[optind]) &&
	      (ch = getopt(argc, argv, ":e:lnrs")) != EOF)
		switch ((char)ch) {
		case 'e':
			editor = optarg;
			break;
		case 'l':
			lflg = 1;
			break;
		case 'n':
			nflg = 1;
			break;
		case 'r':
			rflg = 1;
			break;
		case 's':
			sflg = 1;
			break;
		case ':':
			error("option -%c expects argument", optopt);
		case '?':
		default:
			error("unknown option: -%c", optopt);
		}
	argc -= optind, argv += optind;

	/*
	 * If executing...
	 */
	if (lflg == 0 || editor || sflg) {
		lflg = 0;	/* ignore */
		editfile[0] = '\0';
		/*
		 * Catch interrupts to reset active counter and
		 * cleanup temp files.
		 */
		if (setjmp(jmploc.loc)) {
			active = 0;
			if (*editfile)
				unlink(editfile);
			handler = savehandler;
			longjmp(handler->loc, 1);
		}
		savehandler = handler;
		handler = &jmploc;
		if (++active > MAXHISTLOOPS) {
			active = 0;
			displayhist = 0;
			error("called recursively too many times");
		}
		/*
		 * Set editor.
		 */
		if (sflg == 0) {
			if (editor == NULL &&
			    (editor = bltinlookup("FCEDIT", 1)) == NULL &&
			    (editor = bltinlookup("EDITOR", 1)) == NULL)
				editor = DEFEDITOR;
			if (editor[0] == '-' && editor[1] == '\0') {
				sflg = 1;	/* no edit */
				editor = NULL;
			}
		}
	}

	/*
	 * If executing, parse [old=new] now
	 */
	if (lflg == 0 && argc > 0 && 
	     ((repl = strchr(argv[0], '=')) != NULL)) {
		pat = argv[0];
		*repl++ = '\0';
		argc--, argv++;
	}
	/*
	 * determine [first] and [last]
	 */
	switch (argc) {
	case 0:
		firststr = lflg ? "-16" : "-1";
		laststr = "-1";
		break;
	case 1:
		firststr = argv[0];
		laststr = lflg ? "-1" : argv[0];
		break;
	case 2:
		firststr = argv[0];
		laststr = argv[1];
		break;
	default:
		error("too many args");
	}
	/*
	 * Turn into event numbers.
	 */
	first = str_to_event(firststr, 0);
	last = str_to_event(laststr, 1);

	if (rflg) {
		i = last;
		last = first;
		first = i;
	}
	/*
	 * XXX - this should not depend on the event numbers
	 * always increasing.  Add sequence numbers or offset 
	 * to the history element in next (diskbased) release.
	 */
	direction = first < last ? H_PREV : H_NEXT;

	/*
	 * If editing, grab a temp file.
	 */
	if (editor) {
		int fd;
		INTOFF;		/* easier */
		sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
		if ((fd = mkstemp(editfile)) < 0)
			error("can't create temporary file %s", editfile);
		if ((efp = fdopen(fd, "w")) == NULL) {
			close(fd);
			error("can't allocate stdio buffer for temp\n");
		}
	}

	/*
	 * Loop through selected history events.  If listing or executing,
	 * do it now.  Otherwise, put into temp file and call the editor
	 * after.
	 *
	 * The history interface needs rethinking, as the following
	 * convolutions will demonstrate.
	 */
	history(hist, H_FIRST);
	he = history(hist, H_NEXT_EVENT, first);
	for (;he != NULL; he = history(hist, direction)) {
		if (lflg) {
			if (!nflg)
				out1fmt("%5d ", he->num);
			out1str(he->str);
		} else {
			char *s = pat ? 
			   fc_replace(he->str, pat, repl) : (char *)he->str;

			if (sflg) {
				if (displayhist) {
					out2str(s);
				}
				evalstring(s);
				if (displayhist && hist) {
					/*
					 *  XXX what about recursive and 
					 *  relative histnums.
					 */
					history(hist, H_ENTER, s);
				}
			} else
				fputs(s, efp);
		}
		/*
		 * At end?  (if we were to loose last, we'd sure be
		 * messed up).
		 */
		if (he->num == last)
			break;
	}
	if (editor) {
		char *editcmd;

		fclose(efp);
		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
		sprintf(editcmd, "%s %s", editor, editfile);
		evalstring(editcmd);	/* XXX - should use no JC command */
		INTON;
		readcmdfile(editfile);	/* XXX - should read back - quick tst */
		unlink(editfile);
	}
		
	if (lflg == 0 && active > 0)
		--active;
	if (displayhist)
		displayhist = 0;
}

STATIC char *
fc_replace(s, p, r)
	const char *s;
	char *p, *r;
{
	char *dest;
	int plen = strlen(p);

	STARTSTACKSTR(dest);
	while (*s) {
		if (*s == *p && strncmp(s, p, plen) == 0) {
			while (*r)
				STPUTC(*r++, dest);
			s += plen;
			*p = '\0';	/* so no more matches */
		} else
			STPUTC(*s++, dest);
	}
	STACKSTRNUL(dest);
	dest = grabstackstr(dest);

	return (dest);
}

not_fcnumber(s)
        char *s;
{
        if (*s == '-')
                s++;
	return (!is_number(s));
}

str_to_event(str, last)
	char *str;
	int last;
{
	const HistEvent *he;
	char *s = str;
	int relative = 0;
	int i, j;

	he = history(hist, H_FIRST);
	switch (*s) {
	case '-':
		relative = 1;
		/*FALLTHROUGH*/
	case '+':
		s++;
	}
	if (is_number(s)) {
		i = atoi(s);
		if (relative) {
			while (he != NULL && i--) {
				he = history(hist, H_NEXT);
			}
			if (he == NULL)
				he = history(hist, H_LAST);
		} else {
			he = history(hist, H_NEXT_EVENT, i);
			if (he == NULL) {
				/*
				 * the notion of first and last is
				 * backwards to that of the history package
				 */
				he = history(hist, last ? H_FIRST : H_LAST);
			}
		}
		if (he == NULL)
			error("history number %s not found (internal error)",
			       str);
	} else {
		/*
		 * pattern 
		 */
		he = history(hist, H_PREV_STR, str);
		if (he == NULL)
			error("history pattern not found: %s", str);
	}
	return (he->num);
}
Commit	Line	Data
dc06984c MT	1	/*
	2	* Editline and history functions (and glue).
	3	*/
f7280c66 MT	4	#include <sys/param.h>
f7280c66 MT	5	#include <paths.h>
dc06984c	6	#include <stdio.h>
f7280c66	7	#include "shell.h"
dc06984c	8	#include "parser.h"
f7280c66	9	#include "var.h"
dc06984c	10	#include "options.h"
f7280c66	11	#include "mystring.h"
dc06984c	12	#include "error.h"
dc06984c	13	#include "histedit.h"
f7280c66 MT	14	#include "memalloc.h"
	15
	16	#define MAXHISTLOOPS 4 /* max recursions through fc */
	17	#define DEFEDITOR "ed" /* default editor should be $EDITOR */
dc06984c MT	18
	19	History hist; / history cookie */
	20	EditLine el; / editline cookie */
f7280c66	21	int displayhist;
dc06984c MT	22	static FILE el_in, el_out;
dc06984c MT	23
f7280c66	24	STATIC char fc_replace __P((const char , char , char ));
dc06984c MT	25
	26	/*
	27	* Set history and editing status. Called whenever the status may
	28	* have changed (figures out what to do).
	29	*/
	30	histedit() {
	31
f7280c66 MT	32	#define editing (Eflag \|\| Vflag)
	33
	34	if (iflag) {
dc06984c MT	35	if (!hist) {
	36	/*
	37	* turn history on
	38	*/
	39	INTOFF;
	40	hist = history_init();
	41	INTON;
	42
	43	if (hist != NULL)
	44	sethistsize();
	45	else
	46	out2str("sh: can't initialize history\n");
	47	}
f7280c66	48	if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
dc06984c MT	49	/*
	50	* turn editing on
	51	*/
	52	INTOFF;
	53	if (el_in == NULL)
	54	el_in = fdopen(0, "r");
	55	if (el_out == NULL)
	56	el_out = fdopen(2, "w");
	57	if (el_in == NULL \|\| el_out == NULL)
	58	goto bad;
	59	el = el_init(arg0, el_in, el_out);
	60	if (el != NULL) {
	61	if (hist)
f7280c66	62	el_set(el, EL_HIST, history, hist);
dc06984c MT	63	el_set(el, EL_PROMPT, getprompt);
	64	} else {
	65	bad:
	66	out2str("sh: can't initialize editing\n");
	67	}
	68	INTON;
f7280c66	69	} else if (!editing && el) {
dc06984c MT	70	INTOFF;
	71	el_end(el);
	72	el = NULL;
	73	INTON;
	74	}
f7280c66 MT	75	if (el) {
	76	if (Vflag)
	77	el_set(el, EL_EDITOR, "vi");
	78	else if (Eflag)
	79	el_set(el, EL_EDITOR, "emacs");
	80	}
dc06984c MT	81	} else {
	82	INTOFF;
	83	if (el) { /* no editing if not interactive */
	84	el_end(el);
	85	el = NULL;
	86	}
	87	if (hist) {
	88	history_end(hist);
	89	hist = NULL;
	90	}
	91	INTON;
	92	}
	93	}
	94
	95	sethistsize() {
	96	char *cp;
	97	int histsize;
	98
	99	if (hist != NULL) {
	100	cp = lookupvar("HISTSIZE");
	101	if (cp == NULL \|\| *cp == '\0' \|\|
	102	(histsize = atoi(cp)) < 0)
	103	histsize = 100;
f7280c66 MT	104	history(hist, H_EVENT, histsize);
	105	}
	106	}
	107
	108	/*
	109	* This command is provided since POSIX decided to standardize
	110	* the Korn shell fc command. Oh well...
	111	*/
	112	histcmd(argc, argv)
	113	char *argv[];
	114	{
	115	extern char *optarg;
	116	extern int optind, optopt, optreset;
	117	int ch;
	118	char *editor = NULL;
	119	const HistEvent *he;
	120	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
	121	int i;
	122	char firststr, laststr;
	123	int first, last, direction;
	124	char pat = NULL, repl; /* ksh "fc old=new" crap */
	125	static int active = 0;
	126	struct jmploc jmploc;
	127	struct jmploc *volatile savehandler;
	128	char editfile[MAXPATHLEN + 1];
	129	FILE *efp;
	130
	131	if (hist == NULL)
	132	error("history not active");
c77caef5 KB	133
	134	if (argc == 1)
	135	error("missing history argument");
f7280c66 MT	136
	137	optreset = 1; optind = 1; /* initialize getopt */
	138	while (not_fcnumber(argv[optind]) &&
	139	(ch = getopt(argc, argv, ":e:lnrs")) != EOF)
	140	switch ((char)ch) {
	141	case 'e':
	142	editor = optarg;
	143	break;
	144	case 'l':
	145	lflg = 1;
	146	break;
	147	case 'n':
	148	nflg = 1;
	149	break;
	150	case 'r':
	151	rflg = 1;
	152	break;
	153	case 's':
	154	sflg = 1;
	155	break;
	156	case ':':
	157	error("option -%c expects argument", optopt);
	158	case '?':
	159	default:
	160	error("unknown option: -%c", optopt);
	161	}
	162	argc -= optind, argv += optind;
	163
	164	/*
	165	* If executing...
	166	*/
	167	if (lflg == 0 \|\| editor \|\| sflg) {
	168	lflg = 0; /* ignore */
	169	editfile[0] = '\0';
	170	/*
	171	* Catch interrupts to reset active counter and
	172	* cleanup temp files.
	173	*/
	174	if (setjmp(jmploc.loc)) {
	175	active = 0;
	176	if (*editfile)
	177	unlink(editfile);
	178	handler = savehandler;
	179	longjmp(handler->loc, 1);
	180	}
	181	savehandler = handler;
	182	handler = &jmploc;
	183	if (++active > MAXHISTLOOPS) {
	184	active = 0;
	185	displayhist = 0;
	186	error("called recursively too many times");
	187	}
	188	/*
	189	* Set editor.
	190	*/
	191	if (sflg == 0) {
	192	if (editor == NULL &&
4fcca4ff MT	193	(editor = bltinlookup("FCEDIT", 1)) == NULL &&
4fcca4ff MT	194	(editor = bltinlookup("EDITOR", 1)) == NULL)
f7280c66 MT	195	editor = DEFEDITOR;
	196	if (editor[0] == '-' && editor[1] == '\0') {
	197	sflg = 1; /* no edit */
	198	editor = NULL;
	199	}
	200	}
	201	}
	202
	203	/*
	204	* If executing, parse [old=new] now
	205	*/
	206	if (lflg == 0 && argc > 0 &&
	207	((repl = strchr(argv[0], '=')) != NULL)) {
	208	pat = argv[0];
	209	*repl++ = '\0';
	210	argc--, argv++;
	211	}
	212	/*
	213	* determine [first] and [last]
	214	*/
	215	switch (argc) {
	216	case 0:
	217	firststr = lflg ? "-16" : "-1";
	218	laststr = "-1";
	219	break;
	220	case 1:
	221	firststr = argv[0];
	222	laststr = lflg ? "-1" : argv[0];
	223	break;
	224	case 2:
	225	firststr = argv[0];
	226	laststr = argv[1];
	227	break;
	228	default:
	229	error("too many args");
	230	}
	231	/*
	232	* Turn into event numbers.
	233	*/
	234	first = str_to_event(firststr, 0);
	235	last = str_to_event(laststr, 1);
	236
	237	if (rflg) {
	238	i = last;
	239	last = first;
	240	first = i;
	241	}
	242	/*
	243	* XXX - this should not depend on the event numbers
	244	* always increasing. Add sequence numbers or offset
	245	* to the history element in next (diskbased) release.
	246	*/
	247	direction = first < last ? H_PREV : H_NEXT;
	248
	249	/*
	250	* If editing, grab a temp file.
	251	*/
	252	if (editor) {
	253	int fd;
	254	INTOFF; /* easier */
	255	sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
	256	if ((fd = mkstemp(editfile)) < 0)
	257	error("can't create temporary file %s", editfile);
	258	if ((efp = fdopen(fd, "w")) == NULL) {
259	close(fd);
260	error("can't allocate stdio buffer for temp\n");
261	}
262	}
263
264	/*
265	* Loop through selected history events. If listing or executing,
266	* do it now. Otherwise, put into temp file and call the editor
267	* after.
268	*
269	* The history interface needs rethinking, as the following
270	* convolutions will demonstrate.
271	*/
272	history(hist, H_FIRST);
273	he = history(hist, H_NEXT_EVENT, first);
274	for (;he != NULL; he = history(hist, direction)) {
275	if (lflg) {
276	if (!nflg)
277	out1fmt("%5d ", he->num);
278	out1str(he->str);
279	} else {
280	char *s = pat ?
281	fc_replace(he->str, pat, repl) : (char *)he->str;
282
283	if (sflg) {
284	if (displayhist) {
285	out2str(s);
286	}
287	evalstring(s);
288	if (displayhist && hist) {
289	/*
290	* XXX what about recursive and
291	* relative histnums.
292	*/
293	history(hist, H_ENTER, s);
294	}
295	} else
296	fputs(s, efp);
297	}
298	/*
299	* At end? (if we were to loose last, we'd sure be
300	* messed up).
301	*/
302	if (he->num == last)
303	break;
304	}
305	if (editor) {
306	char *editcmd;
307
308	fclose(efp);
309	editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
310	sprintf(editcmd, "%s %s", editor, editfile);
311	evalstring(editcmd); /* XXX - should use no JC command */
312	INTON;
313	readcmdfile(editfile); /* XXX - should read back - quick tst */
314	unlink(editfile);
315	}
316
317	if (lflg == 0 && active > 0)
318	--active;
319	if (displayhist)
320	displayhist = 0;
321	}
322
323	STATIC char *
324	fc_replace(s, p, r)
325	const char *s;
326	char p, r;
327	{
328	char *dest;
329	int plen = strlen(p);
330
331	STARTSTACKSTR(dest);
332	while (*s) {
333	if (s == p && strncmp(s, p, plen) == 0) {
334	while (*r)
335	STPUTC(*r++, dest);
336	s += plen;
337	p = '\0'; / so no more matches */
338	} else
339	STPUTC(*s++, dest);
340	}
341	STACKSTRNUL(dest);
342	dest = grabstackstr(dest);
343
344	return (dest);
345	}
346
347	not_fcnumber(s)
348	char *s;
349	{
350	if (*s == '-')
351	s++;
352	return (!is_number(s));
353	}
354
355	str_to_event(str, last)
356	char *str;
357	int last;
358	{
359	const HistEvent *he;
360	char *s = str;
361	int relative = 0;
362	int i, j;
363
364	he = history(hist, H_FIRST);
365	switch (*s) {
366	case '-':
367	relative = 1;
368	/FALLTHROUGH/
369	case '+':
370	s++;
371	}
372	if (is_number(s)) {
373	i = atoi(s);
374	if (relative) {
375	while (he != NULL && i--) {
376	he = history(hist, H_NEXT);
377	}
378	if (he == NULL)
379	he = history(hist, H_LAST);
380	} else {
381	he = history(hist, H_NEXT_EVENT, i);
382	if (he == NULL) {
383	/*
384	* the notion of first and last is
385	* backwards to that of the history package
386	*/
387	he = history(hist, last ? H_FIRST : H_LAST);
388	}
389	}
390	if (he == NULL)
391	error("history number %s not found (internal error)",
392	str);
393	} else {
394	/*
395	* pattern
396	*/
ba8ff910	397	he = history(hist, H_PREV_STR, str);
f7280c66 MT	398	if (he == NULL)
f7280c66 MT	399	error("history pattern not found: %s", str);
dc06984c	400	}
f7280c66	401	return (he->num);
dc06984c	402	}