[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");

	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_NEXT_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");
	133
	134	optreset = 1; optind = 1; /* initialize getopt */
	135	while (not_fcnumber(argv[optind]) &&
	136	(ch = getopt(argc, argv, ":e:lnrs")) != EOF)
	137	switch ((char)ch) {
	138	case 'e':
	139	editor = optarg;
	140	break;
	141	case 'l':
	142	lflg = 1;
	143	break;
	144	case 'n':
	145	nflg = 1;
	146	break;
	147	case 'r':
	148	rflg = 1;
	149	break;
	150	case 's':
	151	sflg = 1;
	152	break;
	153	case ':':
	154	error("option -%c expects argument", optopt);
	155	case '?':
	156	default:
	157	error("unknown option: -%c", optopt);
	158	}
	159	argc -= optind, argv += optind;
	160
	161	/*
	162	* If executing...
	163	*/
	164	if (lflg == 0 \|\| editor \|\| sflg) {
	165	lflg = 0; /* ignore */
	166	editfile[0] = '\0';
	167	/*
168	* Catch interrupts to reset active counter and
169	* cleanup temp files.
170	*/
171	if (setjmp(jmploc.loc)) {
172	active = 0;
173	if (*editfile)
174	unlink(editfile);
175	handler = savehandler;
176	longjmp(handler->loc, 1);
177	}
178	savehandler = handler;
179	handler = &jmploc;
180	if (++active > MAXHISTLOOPS) {
181	active = 0;
182	displayhist = 0;
183	error("called recursively too many times");
184	}
185	/*
186	* Set editor.
187	*/
188	if (sflg == 0) {
189	if (editor == NULL &&
4fcca4ff MT	190	(editor = bltinlookup("FCEDIT", 1)) == NULL &&
4fcca4ff MT	191	(editor = bltinlookup("EDITOR", 1)) == NULL)
f7280c66 MT	192	editor = DEFEDITOR;
	193	if (editor[0] == '-' && editor[1] == '\0') {
	194	sflg = 1; /* no edit */
	195	editor = NULL;
	196	}
	197	}
	198	}
	199
	200	/*
	201	* If executing, parse [old=new] now
	202	*/
	203	if (lflg == 0 && argc > 0 &&
	204	((repl = strchr(argv[0], '=')) != NULL)) {
	205	pat = argv[0];
	206	*repl++ = '\0';
	207	argc--, argv++;
	208	}
	209	/*
	210	* determine [first] and [last]
	211	*/
	212	switch (argc) {
	213	case 0:
	214	firststr = lflg ? "-16" : "-1";
	215	laststr = "-1";
	216	break;
	217	case 1:
	218	firststr = argv[0];
	219	laststr = lflg ? "-1" : argv[0];
	220	break;
	221	case 2:
	222	firststr = argv[0];
	223	laststr = argv[1];
	224	break;
	225	default:
	226	error("too many args");
	227	}
	228	/*
	229	* Turn into event numbers.
	230	*/
	231	first = str_to_event(firststr, 0);
	232	last = str_to_event(laststr, 1);
	233
	234	if (rflg) {
	235	i = last;
	236	last = first;
	237	first = i;
	238	}
	239	/*
	240	* XXX - this should not depend on the event numbers
	241	* always increasing. Add sequence numbers or offset
	242	* to the history element in next (diskbased) release.
	243	*/
	244	direction = first < last ? H_PREV : H_NEXT;
	245
	246	/*
	247	* If editing, grab a temp file.
	248	*/
	249	if (editor) {
	250	int fd;
	251	INTOFF; /* easier */
	252	sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP);
	253	if ((fd = mkstemp(editfile)) < 0)
	254	error("can't create temporary file %s", editfile);
	255	if ((efp = fdopen(fd, "w")) == NULL) {
256	close(fd);
257	error("can't allocate stdio buffer for temp\n");
258	}
259	}
260
261	/*
262	* Loop through selected history events. If listing or executing,
263	* do it now. Otherwise, put into temp file and call the editor
264	* after.
265	*
266	* The history interface needs rethinking, as the following
267	* convolutions will demonstrate.
268	*/
269	history(hist, H_FIRST);
270	he = history(hist, H_NEXT_EVENT, first);
271	for (;he != NULL; he = history(hist, direction)) {
272	if (lflg) {
273	if (!nflg)
274	out1fmt("%5d ", he->num);
275	out1str(he->str);
276	} else {
277	char *s = pat ?
278	fc_replace(he->str, pat, repl) : (char *)he->str;
279
280	if (sflg) {
281	if (displayhist) {
282	out2str(s);
283	}
284	evalstring(s);
285	if (displayhist && hist) {
286	/*
287	* XXX what about recursive and
288	* relative histnums.
289	*/
290	history(hist, H_ENTER, s);
291	}
292	} else
293	fputs(s, efp);
294	}
295	/*
296	* At end? (if we were to loose last, we'd sure be
297	* messed up).
298	*/
299	if (he->num == last)
300	break;
301	}
302	if (editor) {
303	char *editcmd;
304
305	fclose(efp);
306	editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
307	sprintf(editcmd, "%s %s", editor, editfile);
308	evalstring(editcmd); /* XXX - should use no JC command */
309	INTON;
310	readcmdfile(editfile); /* XXX - should read back - quick tst */
311	unlink(editfile);
312	}
313
314	if (lflg == 0 && active > 0)
315	--active;
316	if (displayhist)
317	displayhist = 0;
318	}
319
320	STATIC char *
321	fc_replace(s, p, r)
322	const char *s;
323	char p, r;
324	{
325	char *dest;
326	int plen = strlen(p);
327
328	STARTSTACKSTR(dest);
329	while (*s) {
330	if (s == p && strncmp(s, p, plen) == 0) {
331	while (*r)
332	STPUTC(*r++, dest);
333	s += plen;
334	p = '\0'; / so no more matches */
335	} else
336	STPUTC(*s++, dest);
337	}
338	STACKSTRNUL(dest);
339	dest = grabstackstr(dest);
340
341	return (dest);
342	}
343
344	not_fcnumber(s)
345	char *s;
346	{
347	if (*s == '-')
348	s++;
349	return (!is_number(s));
350	}
351
352	str_to_event(str, last)
353	char *str;
354	int last;
355	{
356	const HistEvent *he;
357	char *s = str;
358	int relative = 0;
359	int i, j;
360
361	he = history(hist, H_FIRST);
362	switch (*s) {
363	case '-':
364	relative = 1;
365	/FALLTHROUGH/
366	case '+':
367	s++;
368	}
369	if (is_number(s)) {
370	i = atoi(s);
371	if (relative) {
372	while (he != NULL && i--) {
373	he = history(hist, H_NEXT);
374	}
375	if (he == NULL)
376	he = history(hist, H_LAST);
377	} else {
378	he = history(hist, H_NEXT_EVENT, i);
379	if (he == NULL) {
380	/*
381	* the notion of first and last is
382	* backwards to that of the history package
383	*/
384	he = history(hist, last ? H_FIRST : H_LAST);
385	}
386	}
387	if (he == NULL)
388	error("history number %s not found (internal error)",
389	str);
390	} else {
391	/*
392	* pattern
393	*/
394	he = history(hist, H_NEXT_STR, str);
395	if (he == NULL)
396	error("history pattern not found: %s", str);
dc06984c	397	}
f7280c66	398	return (he->num);
dc06984c	399	}