/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Christos Zoulas of Cornell University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if !defined(lint) && !defined(SCCSID)
static char sccsid[] = "@(#)search.c	8.1 (Berkeley) 6/4/93";
#endif /* not lint && not SCCSID */

/*
 * search.c: History and character search functions
 */
#include "sys.h"
#include <stdlib.h>
#ifdef REGEXEC
#include <sys/types.h>
#include <regex.h>
#else
#ifdef REGEXP
#include <regexp.h>
#endif
#endif
#include "el.h"

/*
 * Adjust cursor in vi mode to include the character under it
 */
#define EL_CURSOR(el) \
    ((el)->el_line.cursor + (((el)->el_map.type == MAP_VI) && \
			    ((el)->el_map.current == (el)->el_map.alt)))

/* search_init():
 *	Initialize the search stuff
 */
protected int
search_init(el)
    EditLine *el;
{
    el->el_search.patbuf = (char *) el_malloc(EL_BUFSIZ);
    el->el_search.patlen = 0;
    el->el_search.patdir = -1;
    el->el_search.chacha = '\0';
    el->el_search.chadir = -1;
    return 0;
}


/* search_end():
 *	Initialize the search stuff
 */
protected void
search_end(el)
    EditLine *el;
{
    el_free((ptr_t) el->el_search.patbuf);
    el->el_search.patbuf = NULL;
}

#ifdef REGEXP
/* regerror():
 *	Handle regular expression errors
 */
public void
/*ARGSUSED*/
regerror(msg)
    const char *msg;
{
}
#endif

/* el_match():
 *	Return if string matches pattern
 */
protected int
el_match(str, pat)
    const char *str;
    const char *pat;
{
#ifdef REGEXEC
    regex_t re;
#else
#ifndef REGEXP
    extern char *re_comp __P((const char *));
    extern int re_exec __P((const char *));
#else
    regexp *re;
    int rv;
#endif
#endif

    if (strstr(str, pat) != NULL)
	return 1;
#ifdef REGEXEC
    if (regcomp(&re, pat, REG_EXTENDED | REG_NOSUB) != 0)
	return 0;
    return (regexec(&re, str, 0, NULL, 0) == 0);
#else
#ifndef REGEXP
    if (re_comp(pat) != NULL)
	return 0;
    else
    return re_exec(str) == 1;
#else
    if ((re = regcomp(pat)) != NULL) {
	rv = regexec(re, str);
	free((ptr_t) re);
    }
    else
	rv = 0;
    return rv;
#endif
#endif
}


/* c_hmatch():
 *	 return True if the pattern matches the prefix
 */
protected int
c_hmatch(el, str)
    EditLine *el;
    const char *str;
{
#ifdef SDEBUG
    (void) fprintf(el->el_errfile, "match `%s' with `%s'\n",
		   el->el_search.patbuf, str);
#endif /* SDEBUG */

    return el_match(str, el->el_search.patbuf);
}


/* c_setpat():
 *	Set the history seatch pattern
 */
protected void
c_setpat(el)
    EditLine *el;
{
    if (el->el_state.lastcmd != ED_SEARCH_PREV_HISTORY &&
	el->el_state.lastcmd != ED_SEARCH_NEXT_HISTORY) {
	el->el_search.patlen = EL_CURSOR(el) - el->el_line.buffer;
	if (el->el_search.patlen >= EL_BUFSIZ)
	    el->el_search.patlen = EL_BUFSIZ -1;
	if (el->el_search.patlen >= 0)  {
	    (void) strncpy(el->el_search.patbuf, el->el_line.buffer,
			   el->el_search.patlen);
	    el->el_search.patbuf[el->el_search.patlen] = '\0';
	}
	else
	    el->el_search.patlen = strlen(el->el_search.patbuf);
    }
#ifdef SDEBUG
    (void) fprintf(el->el_errfile, "\neventno = %d\n", el->el_history.eventno);
    (void) fprintf(el->el_errfile, "patlen = %d\n", el->el_search.patlen);
    (void) fprintf(el->el_errfile, "patbuf = \"%s\"\n", el->el_search.patbuf);
    (void) fprintf(el->el_errfile, "cursor %d lastchar %d\n",
		   EL_CURSOR(el) - el->el_line.buffer,
		   el->el_line.lastchar - el->el_line.buffer);
#endif
}


/* ce_inc_search():
 *	Emacs incremental search
 */
protected el_action_t
ce_inc_search(el, dir)
    EditLine *el;
    int dir;
{
    static char STRfwd[] = { 'f', 'w', 'd', '\0' },
		STRbck[] = { 'b', 'c', 'k', '\0' };
    static char pchar = ':';	/* ':' = normal, '?' = failed */
    static char endcmd[2] = { '\0', '\0' };
    char ch, *cp, *ocursor = el->el_line.cursor, oldpchar = pchar;

    el_action_t ret = CC_NORM;

    int ohisteventno = el->el_history.eventno,
	oldpatlen = el->el_search.patlen,
	newdir = dir,
        done, redo;

    if (el->el_line.lastchar + sizeof(STRfwd) / sizeof(char) + 2 +
	el->el_search.patlen >= el->el_line.limit)
	return CC_ERROR;

    for (;;) {

	if (el->el_search.patlen == 0) {	/* first round */
	    pchar = ':';
#ifdef ANCHOR
	    el->el_search.patbuf[el->el_search.patlen++] = '.';
	    el->el_search.patbuf[el->el_search.patlen++] = '*';
#endif
	}
	done = redo = 0;
	*el->el_line.lastchar++ = '\n';
	for (cp = newdir == ED_SEARCH_PREV_HISTORY ? STRbck : STRfwd;
	     *cp; *el->el_line.lastchar++ = *cp++)
	     continue;
	*el->el_line.lastchar++ = pchar;
	for (cp = &el->el_search.patbuf[1];
	      cp < &el->el_search.patbuf[el->el_search.patlen];
	      *el->el_line.lastchar++ = *cp++)
	    continue;
	*el->el_line.lastchar = '\0';
	re_refresh(el);

	if (el_getc(el, &ch) != 1)
	    return ed_end_of_file(el, 0);

	switch (el->el_map.current[(unsigned char) ch]) {
	case ED_INSERT:
	case ED_DIGIT:
	    if (el->el_search.patlen > EL_BUFSIZ - 3)
		term_beep(el);
	    else {
		el->el_search.patbuf[el->el_search.patlen++] = ch;
		*el->el_line.lastchar++ = ch;
		*el->el_line.lastchar = '\0';
		re_refresh(el);
	    }
	    break;

	case EM_INC_SEARCH_NEXT:
	    newdir = ED_SEARCH_NEXT_HISTORY;
	    redo++;
	    break;

	case EM_INC_SEARCH_PREV:
	    newdir = ED_SEARCH_PREV_HISTORY;
	    redo++;
	    break;

	case ED_DELETE_PREV_CHAR:
	    if (el->el_search.patlen > 1)
		done++;
	    else
		term_beep(el);
	    break;

	default:
	    switch (ch) {
	    case 0007:		/* ^G: Abort */
		ret = CC_ERROR;
		done++;
		break;

	    case 0027:		/* ^W: Append word */
		/* No can do if globbing characters in pattern */
		for (cp = &el->el_search.patbuf[1]; ; cp++)
		    if (cp >= &el->el_search.patbuf[el->el_search.patlen]) {
			el->el_line.cursor += el->el_search.patlen - 1;
			cp = c__next_word(el->el_line.cursor,
					  el->el_line.lastchar, 1, ce__isword);
			while (el->el_line.cursor < cp &&
			       *el->el_line.cursor != '\n') {
			    if (el->el_search.patlen > EL_BUFSIZ - 3) {
				term_beep(el);
				break;
			    }
			    el->el_search.patbuf[el->el_search.patlen++] =
				*el->el_line.cursor;
			    *el->el_line.lastchar++ = *el->el_line.cursor++;
			}
			el->el_line.cursor = ocursor;
			*el->el_line.lastchar = '\0';
			re_refresh(el);
			break;
		    } else if (isglob(*cp)) {
			term_beep(el);
			break;
		    }
		break;

	    default:		/* Terminate and execute cmd */
		endcmd[0] = ch;
		el_push(el, endcmd);
		/*FALLTHROUGH*/

	    case 0033:		/* ESC: Terminate */
		ret = CC_REFRESH;
		done++;
		break;
	    }
	    break;
	}

	while (el->el_line.lastchar > el->el_line.buffer &&
	       *el->el_line.lastchar != '\n')
	    *el->el_line.lastchar-- = '\0';
	*el->el_line.lastchar = '\0';

	if (!done) {

	    /* Can't search if unmatched '[' */
	    for (cp = &el->el_search.patbuf[el->el_search.patlen-1], ch = ']';
		 cp > el->el_search.patbuf; cp--)
		if (*cp == '[' || *cp == ']') {
		    ch = *cp;
		    break;
		}

	    if (el->el_search.patlen > 1 && ch != '[') {
		if (redo && newdir == dir) {
		    if (pchar == '?') {	/* wrap around */
			el->el_history.eventno =
			    newdir == ED_SEARCH_PREV_HISTORY ? 0 : 0x7fffffff;
			if (hist_get(el) == CC_ERROR)
			    /* el->el_history.eventno was fixed by first call */
			    (void) hist_get(el);
			el->el_line.cursor = newdir == ED_SEARCH_PREV_HISTORY ?
			    el->el_line.lastchar : el->el_line.buffer;
		    } else
			el->el_line.cursor +=
				newdir == ED_SEARCH_PREV_HISTORY ? -1 : 1;
		}
#ifdef ANCHOR
		el->el_search.patbuf[el->el_search.patlen++] = '.';
		el->el_search.patbuf[el->el_search.patlen++] = '*';
#endif
		el->el_search.patbuf[el->el_search.patlen] = '\0';
		if (el->el_line.cursor < el->el_line.buffer ||
		    el->el_line.cursor > el->el_line.lastchar ||
		    (ret = ce_search_line(el, &el->el_search.patbuf[1],
					  newdir)) == CC_ERROR) {
		    /* avoid c_setpat */
		    el->el_state.lastcmd = (el_action_t) newdir;
		    ret = newdir == ED_SEARCH_PREV_HISTORY ?
			ed_search_prev_history(el, 0) :
			ed_search_next_history(el, 0);
		    if (ret != CC_ERROR) {
			el->el_line.cursor = newdir == ED_SEARCH_PREV_HISTORY ?
			    el->el_line.lastchar : el->el_line.buffer;
			(void) ce_search_line(el, &el->el_search.patbuf[1],
					      newdir);
		    }
		}
		el->el_search.patbuf[--el->el_search.patlen] = '\0';
		if (ret == CC_ERROR) {
		    term_beep(el);
		    if (el->el_history.eventno != ohisteventno) {
			el->el_history.eventno = ohisteventno;
			if (hist_get(el) == CC_ERROR)
			    return CC_ERROR;
		    }
		    el->el_line.cursor = ocursor;
		    pchar = '?';
		} else {
		    pchar = ':';
		}
	    }

	    ret = ce_inc_search(el, newdir);

	    if (ret == CC_ERROR && pchar == '?' && oldpchar == ':')
		/* break abort of failed search at last non-failed */
		ret = CC_NORM;

	}

	if (ret == CC_NORM || (ret == CC_ERROR && oldpatlen == 0)) {
	    /* restore on normal return or error exit */
	    pchar = oldpchar;
	    el->el_search.patlen = oldpatlen;
	    if (el->el_history.eventno != ohisteventno) {
		el->el_history.eventno = ohisteventno;
		if (hist_get(el) == CC_ERROR)
		    return CC_ERROR;
	    }
	    el->el_line.cursor = ocursor;
	    if (ret == CC_ERROR)
		re_refresh(el);
	}
	if (done || ret != CC_NORM)
	    return ret;
    }
}


/* cv_search():
 *	Vi search.
 */
protected el_action_t
cv_search(el, dir)
    EditLine *el;
    int dir;
{
    char ch;
    char tmpbuf[EL_BUFSIZ];
    int tmplen;

    tmplen = 0;
#ifdef ANCHOR
    tmpbuf[tmplen++] = '.';
    tmpbuf[tmplen++] = '*';
#endif

    el->el_line.buffer[0] = '\0';
    el->el_line.lastchar = el->el_line.buffer;
    el->el_line.cursor = el->el_line.buffer;
    el->el_search.patdir = dir;

    c_insert(el, 2);	/* prompt + '\n' */
    *el->el_line.cursor++ = '\n';
    *el->el_line.cursor++ = dir == ED_SEARCH_PREV_HISTORY ? '/' : '?';
    re_refresh(el);

#ifdef ANCHOR
# define LEN 2
#else
# define LEN 0
#endif

    tmplen = c_gets(el, &tmpbuf[LEN]) + LEN;
    ch = tmpbuf[tmplen];
    tmpbuf[tmplen] = '\0';

    if (tmplen == LEN) {
	/*
	 * Use the old pattern, but wild-card it.
	 */
	if (el->el_search.patlen == 0) {
	    el->el_line.buffer[0] = '\0';
	    el->el_line.lastchar = el->el_line.buffer;
	    el->el_line.cursor = el->el_line.buffer;
	    re_refresh(el);
	    return CC_ERROR;
	}
#ifdef ANCHOR
	if (el->el_search.patbuf[0] != '.' && el->el_search.patbuf[0] != '*') {
	    (void) strcpy(tmpbuf, el->el_search.patbuf);
	    el->el_search.patbuf[0] = '.';
	    el->el_search.patbuf[1] = '*';
	    (void) strcpy(&el->el_search.patbuf[2], tmpbuf);
	    el->el_search.patlen++;
	    el->el_search.patbuf[el->el_search.patlen++] = '.';
	    el->el_search.patbuf[el->el_search.patlen++] = '*';
	    el->el_search.patbuf[el->el_search.patlen] = '\0';
	}
#endif
    }
    else {
#ifdef ANCHOR
	tmpbuf[tmplen++] = '.';
	tmpbuf[tmplen++] = '*';
#endif
	tmpbuf[tmplen] = '\0';
	(void) strcpy(el->el_search.patbuf, tmpbuf);
	el->el_search.patlen = tmplen;
    }
    el->el_state.lastcmd = (el_action_t) dir; /* avoid c_setpat */
    el->el_line.cursor = el->el_line.lastchar = el->el_line.buffer;
    if ((dir == ED_SEARCH_PREV_HISTORY ? ed_search_prev_history(el, 0) :
			        ed_search_next_history(el, 0)) == CC_ERROR) {
	re_refresh(el);
	return CC_ERROR;
    }
    else {
	if (ch == 0033) {
	    re_refresh(el);
	    *el->el_line.lastchar++ = '\n';
	    *el->el_line.lastchar = '\0';
	    re_goto_bottom(el);
	    return CC_NEWLINE;
	}
	else
	    return CC_REFRESH;
    }
}


/* ce_search_line():
 *	Look for a pattern inside a line
 */
protected el_action_t
ce_search_line(el, pattern, dir)
    EditLine *el;
    char *pattern;
    int dir;
{
    char *cp;

    if (dir == ED_SEARCH_PREV_HISTORY) {
	for (cp = el->el_line.cursor; cp >= el->el_line.buffer; cp--)
	    if (el_match(cp, pattern)) {
		el->el_line.cursor = cp;
		return CC_NORM;
	    }
	return CC_ERROR;
    } else {
	for (cp = el->el_line.cursor; *cp != '\0' &&
	     cp < el->el_line.limit; cp++)
	    if (el_match(cp, pattern)) {
		el->el_line.cursor = cp;
		return CC_NORM;
	    }
	return CC_ERROR;
    }
}


/* cv_repeat_srch():
 *	Vi repeat search
 */
protected el_action_t
cv_repeat_srch(el, c)
    EditLine *el;
    int c;
{
#ifdef SDEBUG
    (void) fprintf(el->el_errfile, "dir %d patlen %d patbuf %s\n",
		   c, el->el_search.patlen, el->el_search.patbuf);
#endif

    el->el_state.lastcmd = (el_action_t) c;  /* Hack to stop c_setpat */
    el->el_line.lastchar = el->el_line.buffer;

    switch (c) {
    case ED_SEARCH_NEXT_HISTORY:
	return ed_search_next_history(el, 0);
    case ED_SEARCH_PREV_HISTORY:
	return ed_search_prev_history(el, 0);
    default:
	return CC_ERROR;
    }
}


/* cv_csearch_back():
 *	Vi character search reverse
 */
protected el_action_t
cv_csearch_back(el, ch, count, tflag)
    EditLine *el;
    int ch, count, tflag;
{
    char *cp;

    cp = el->el_line.cursor;
    while (count--) {
	if (*cp == ch)
	    cp--;
	while (cp > el->el_line.buffer && *cp != ch)
	    cp--;
    }

    if (cp < el->el_line.buffer || (cp == el->el_line.buffer && *cp != ch))
	return CC_ERROR;

    if (*cp == ch && tflag)
	cp++;

    el->el_line.cursor = cp;

    if (el->el_chared.c_vcmd.action & DELETE) {
	el->el_line.cursor++;
	cv_delfini(el);
	return CC_REFRESH;
    }

    re_refresh_cursor(el);
    return CC_NORM;
}


/* cv_csearch_fwd():
 *	Vi character search forward
 */
protected el_action_t
cv_csearch_fwd(el, ch, count, tflag)
    EditLine *el;
    int ch, count, tflag;
{
    char *cp;

    cp = el->el_line.cursor;
    while (count--) {
	if(*cp == ch)
	    cp++;
	while (cp < el->el_line.lastchar && *cp != ch)
	    cp++;
    }

    if (cp >= el->el_line.lastchar)
	return CC_ERROR;

    if (*cp == ch && tflag)
	cp--;

    el->el_line.cursor = cp;

    if (el->el_chared.c_vcmd.action & DELETE) {
	el->el_line.cursor++;
	cv_delfini(el);
	return CC_REFRESH;
    }
    re_refresh_cursor(el);
    return CC_NORM;
}
