/*      $OpenBSD: common.c,v 1.23 2023/03/08 04:43:05 guenther Exp $    */
/*      $NetBSD: common.c,v 1.24 2009/12/30 22:37:40 christos Exp $     */

/*-
 * 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. 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.
 */

#include "config.h"

/*
 * common.c: Common Editor functions
 */
#include <ctype.h>
#include <string.h>

#include "el.h"
#include "common.h"
#include "fcns.h"
#include "parse.h"
#include "vi.h"

/* ed_end_of_file():
 *      Indicate end of file
 *      [^D]
 */
protected el_action_t
ed_end_of_file(EditLine *el, wint_t c __attribute__((__unused__)))
{

        re_goto_bottom(el);
        *el->el_line.lastchar = '\0';
        return CC_EOF;
}


/* ed_insert():
 *      Add character to the line
 *      Insert a character [bound to all insert keys]
 */
protected el_action_t
ed_insert(EditLine *el, wint_t c)
{
        int count = el->el_state.argument;

        if (c == '\0')
                return CC_ERROR;

        if (el->el_line.lastchar + el->el_state.argument >=
            el->el_line.limit) {
                /* end of buffer space, try to allocate more */
                if (!ch_enlargebufs(el, (size_t) count))
                        return CC_ERROR;        /* error allocating more */
        }

        if (count == 1) {
                if (el->el_state.inputmode == MODE_INSERT
                    || el->el_line.cursor >= el->el_line.lastchar)
                        c_insert(el, 1);

                *el->el_line.cursor++ = c;
                re_fastaddc(el);                /* fast refresh for one char. */
        } else {
                if (el->el_state.inputmode != MODE_REPLACE_1)
                        c_insert(el, el->el_state.argument);

                while (count-- && el->el_line.cursor < el->el_line.lastchar)
                        *el->el_line.cursor++ = c;
                re_refresh(el);
        }

        if (el->el_state.inputmode == MODE_REPLACE_1)
                return vi_command_mode(el, 0);

        return CC_NORM;
}


/* ed_delete_prev_word():
 *      Delete from beginning of current word to cursor
 *      [M-^?] [^W]
 */
protected el_action_t
ed_delete_prev_word(EditLine *el, wint_t c __attribute__((__unused__)))
{
        wchar_t *cp, *p, *kp;

        if (el->el_line.cursor == el->el_line.buffer)
                return CC_ERROR;

        cp = c__prev_word(el->el_line.cursor, el->el_line.buffer,
            el->el_state.argument, ce__isword);

        for (p = cp, kp = el->el_chared.c_kill.buf; p < el->el_line.cursor; p++)
                *kp++ = *p;
        el->el_chared.c_kill.last = kp;

        c_delbefore(el, (int)(el->el_line.cursor - cp));/* delete before dot */
        el->el_line.cursor = cp;
        if (el->el_line.cursor < el->el_line.buffer)
                el->el_line.cursor = el->el_line.buffer; /* bounds check */
        return CC_REFRESH;
}


/* ed_delete_next_char():
 *      Delete character under cursor
 *      [^D] [x]
 */
protected el_action_t
ed_delete_next_char(EditLine *el, wint_t c)
{
#ifdef notdef                   /* XXX */
#define EL      el->el_line
        (void) fprintf(el->el_errfile,
            "\nD(b: %p(%ls)  c: %p(%ls) last: %p(%ls) limit: %p(%ls)\n",
            EL.buffer, EL.buffer, EL.cursor, EL.cursor, EL.lastchar,
            EL.lastchar, EL.limit, EL.limit);
#endif
        if (el->el_line.cursor == el->el_line.lastchar) {
                        /* if I'm at the end */
                if (el->el_map.type == MAP_VI) {
                        if (el->el_line.cursor == el->el_line.buffer) {
                                /* if I'm also at the beginning */
#ifdef KSHVI
                                return CC_ERROR;
#else
                                /* then do an EOF */
                                terminal_writec(el, c);
                                return CC_EOF;
#endif
                        } else {
#ifdef KSHVI
                                el->el_line.cursor--;
#else
                                return CC_ERROR;
#endif
                        }
                } else {
                        if (el->el_line.cursor != el->el_line.buffer)
                                el->el_line.cursor--;
                        else
                                return CC_ERROR;
                }
        }
        c_delafter(el, el->el_state.argument);  /* delete after dot */
        if (el->el_line.cursor >= el->el_line.lastchar &&
            el->el_line.cursor > el->el_line.buffer)
                        /* bounds check */
                el->el_line.cursor = el->el_line.lastchar - 1;
        return CC_REFRESH;
}


/* ed_kill_line():
 *      Cut to the end of line
 *      [^K] [^K]
 */
protected el_action_t
ed_kill_line(EditLine *el, wint_t c __attribute__((__unused__)))
{
        wchar_t *kp, *cp;

        cp = el->el_line.cursor;
        kp = el->el_chared.c_kill.buf;
        while (cp < el->el_line.lastchar)
                *kp++ = *cp++;  /* copy it */
        el->el_chared.c_kill.last = kp;
                        /* zap! -- delete to end */
        el->el_line.lastchar = el->el_line.cursor;
        return CC_REFRESH;
}


/* ed_move_to_end():
 *      Move cursor to the end of line
 *      [^E] [^E]
 */
protected el_action_t
ed_move_to_end(EditLine *el, wint_t c __attribute__((__unused__)))
{

        el->el_line.cursor = el->el_line.lastchar;
        if (el->el_map.type == MAP_VI) {
                if (el->el_chared.c_vcmd.action != NOP) {
                        cv_delfini(el);
                        return CC_REFRESH;
                }
#ifdef VI_MOVE
                el->el_line.cursor--;
#endif
        }
        return CC_CURSOR;
}


/* ed_move_to_beg():
 *      Move cursor to the beginning of line
 *      [^A] [^A]
 */
protected el_action_t
ed_move_to_beg(EditLine *el, wint_t c __attribute__((__unused__)))
{

        el->el_line.cursor = el->el_line.buffer;

        if (el->el_map.type == MAP_VI) {
                        /* We want FIRST non space character */
                while (iswspace(*el->el_line.cursor))
                        el->el_line.cursor++;
                if (el->el_chared.c_vcmd.action != NOP) {
                        cv_delfini(el);
                        return CC_REFRESH;
                }
        }
        return CC_CURSOR;
}


/* ed_transpose_chars():
 *      Exchange the character to the left of the cursor with the one under it
 *      [^T] [^T]
 */
protected el_action_t
ed_transpose_chars(EditLine *el, wint_t c)
{

        if (el->el_line.cursor < el->el_line.lastchar) {
                if (el->el_line.lastchar <= &el->el_line.buffer[1])
                        return CC_ERROR;
                else
                        el->el_line.cursor++;
        }
        if (el->el_line.cursor > &el->el_line.buffer[1]) {
                /* must have at least two chars entered */
                c = el->el_line.cursor[-2];
                el->el_line.cursor[-2] = el->el_line.cursor[-1];
                el->el_line.cursor[-1] = c;
                return CC_REFRESH;
        } else
                return CC_ERROR;
}


/* ed_next_char():
 *      Move to the right one character
 *      [^F] [^F]
 */
protected el_action_t
ed_next_char(EditLine *el, wint_t c __attribute__((__unused__)))
{
        wchar_t *lim = el->el_line.lastchar;

        if (el->el_line.cursor >= lim ||
            (el->el_line.cursor == lim - 1 &&
            el->el_map.type == MAP_VI &&
            el->el_chared.c_vcmd.action == NOP))
                return CC_ERROR;

        el->el_line.cursor += el->el_state.argument;
        if (el->el_line.cursor > lim)
                el->el_line.cursor = lim;

        if (el->el_map.type == MAP_VI)
                if (el->el_chared.c_vcmd.action != NOP) {
                        cv_delfini(el);
                        return CC_REFRESH;
                }
        return CC_CURSOR;
}


/* ed_prev_word():
 *      Move to the beginning of the current word
 *      [M-b] [b]
 */
protected el_action_t
ed_prev_word(EditLine *el, wint_t c __attribute__((__unused__)))
{

        if (el->el_line.cursor == el->el_line.buffer)
                return CC_ERROR;

        el->el_line.cursor = c__prev_word(el->el_line.cursor,
            el->el_line.buffer,
            el->el_state.argument,
            ce__isword);

        if (el->el_map.type == MAP_VI)
                if (el->el_chared.c_vcmd.action != NOP) {
                        cv_delfini(el);
                        return CC_REFRESH;
                }
        return CC_CURSOR;
}


/* ed_prev_char():
 *      Move to the left one character
 *      [^B] [^B]
 */
protected el_action_t
ed_prev_char(EditLine *el, wint_t c __attribute__((__unused__)))
{

        if (el->el_line.cursor > el->el_line.buffer) {
                el->el_line.cursor -= el->el_state.argument;
                if (el->el_line.cursor < el->el_line.buffer)
                        el->el_line.cursor = el->el_line.buffer;

                if (el->el_map.type == MAP_VI)
                        if (el->el_chared.c_vcmd.action != NOP) {
                                cv_delfini(el);
                                return CC_REFRESH;
                        }
                return CC_CURSOR;
        } else
                return CC_ERROR;
}


/* ed_quoted_insert():
 *      Add the next character typed verbatim
 *      [^V] [^V]
 */
protected el_action_t
ed_quoted_insert(EditLine *el, wint_t c)
{
        int num;

        tty_quotemode(el);
        num = el_wgetc(el, &c);
        tty_noquotemode(el);
        if (num == 1)
                return ed_insert(el, c);
        else
                return ed_end_of_file(el, 0);
}


/* ed_digit():
 *      Adds to argument or enters a digit
 */
protected el_action_t
ed_digit(EditLine *el, wint_t c)
{

        if (!iswdigit(c))
                return CC_ERROR;

        if (el->el_state.doingarg) {
                        /* if doing an arg, add this in... */
                if (el->el_state.lastcmd == EM_UNIVERSAL_ARGUMENT)
                        el->el_state.argument = c - '0';
                else {
                        if (el->el_state.argument > 1000000)
                                return CC_ERROR;
                        el->el_state.argument =
                            (el->el_state.argument * 10) + (c - '0');
                }
                return CC_ARGHACK;
        }

        return ed_insert(el, c);
}


/* ed_argument_digit():
 *      Digit that starts argument
 *      For ESC-n
 */
protected el_action_t
ed_argument_digit(EditLine *el, wint_t c)
{

        if (!iswdigit(c))
                return CC_ERROR;

        if (el->el_state.doingarg) {
                if (el->el_state.argument > 1000000)
                        return CC_ERROR;
                el->el_state.argument = (el->el_state.argument * 10) +
                    (c - '0');
        } else {                /* else starting an argument */
                el->el_state.argument = c - '0';
                el->el_state.doingarg = 1;
        }
        return CC_ARGHACK;
}


/* ed_unassigned():
 *      Indicates unbound character
 *      Bound to keys that are not assigned
 */
protected el_action_t
ed_unassigned(EditLine *el, wint_t c __attribute__((__unused__)))
{

        return CC_ERROR;
}


/* ed_ignore():
 *      Input characters that have no effect
 *      [^C ^O ^Q ^S ^Z ^\ ^]] [^C ^O ^Q ^S ^\]
 */
protected el_action_t
ed_ignore(EditLine *el __attribute__((__unused__)),
              wint_t c __attribute__((__unused__)))
{

        return CC_NORM;
}


/* ed_newline():
 *      Execute command
 *      [^J]
 */
protected el_action_t
ed_newline(EditLine *el, wint_t c __attribute__((__unused__)))
{

        re_goto_bottom(el);
        *el->el_line.lastchar++ = '\n';
        *el->el_line.lastchar = '\0';
        return CC_NEWLINE;
}


/* ed_delete_prev_char():
 *      Delete the character to the left of the cursor
 *      [^?]
 */
protected el_action_t
ed_delete_prev_char(EditLine *el, wint_t c __attribute__((__unused__)))
{

        if (el->el_line.cursor <= el->el_line.buffer)
                return CC_ERROR;

        c_delbefore(el, el->el_state.argument);
        el->el_line.cursor -= el->el_state.argument;
        if (el->el_line.cursor < el->el_line.buffer)
                el->el_line.cursor = el->el_line.buffer;
        return CC_REFRESH;
}


/* ed_clear_screen():
 *      Clear screen leaving current line at the top
 *      [^L]
 */
protected el_action_t
ed_clear_screen(EditLine *el, wint_t c __attribute__((__unused__)))
{

        terminal_clear_screen(el);      /* clear the whole real screen */
        re_clear_display(el);   /* reset everything */
        return CC_REFRESH;
}


/* ed_redisplay():
 *      Redisplay everything
 *      ^R
 */
protected el_action_t
ed_redisplay(EditLine *el __attribute__((__unused__)),
             wint_t c __attribute__((__unused__)))
{

        return CC_REDISPLAY;
}


/* ed_start_over():
 *      Erase current line and start from scratch
 *      [^G]
 */
protected el_action_t
ed_start_over(EditLine *el, wint_t c __attribute__((__unused__)))
{

        ch_reset(el);
        return CC_REFRESH;
}


/* ed_sequence_lead_in():
 *      First character in a bound sequence
 *      Placeholder for external keys
 */
protected el_action_t
ed_sequence_lead_in(EditLine *el __attribute__((__unused__)),
                    wint_t c __attribute__((__unused__)))
{

        return CC_NORM;
}


/* ed_prev_history():
 *      Move to the previous history line
 *      [^P] [k]
 */
protected el_action_t
ed_prev_history(EditLine *el, wint_t c __attribute__((__unused__)))
{
        char beep = 0;
        int sv_event = el->el_history.eventno;

        el->el_chared.c_undo.len = -1;
        *el->el_line.lastchar = '\0';           /* just in case */

        if (el->el_history.eventno == 0) {      /* save the current buffer
                                                 * away */
                (void) wcsncpy(el->el_history.buf, el->el_line.buffer,
                    EL_BUFSIZ);
                el->el_history.last = el->el_history.buf +
                    (el->el_line.lastchar - el->el_line.buffer);
        }
        el->el_history.eventno += el->el_state.argument;

        if (hist_get(el) == CC_ERROR) {
                if (el->el_map.type == MAP_VI) {
                        el->el_history.eventno = sv_event;
                }
                beep = 1;
                /* el->el_history.eventno was fixed by first call */
                (void) hist_get(el);
        }
        if (beep)
                return CC_REFRESH_BEEP;
        return CC_REFRESH;
}


/* ed_next_history():
 *      Move to the next history line
 *      [^N] [j]
 */
protected el_action_t
ed_next_history(EditLine *el, wint_t c __attribute__((__unused__)))
{
        el_action_t beep = CC_REFRESH, rval;

        el->el_chared.c_undo.len = -1;
        *el->el_line.lastchar = '\0';   /* just in case */

        el->el_history.eventno -= el->el_state.argument;

        if (el->el_history.eventno < 0) {
                el->el_history.eventno = 0;
                beep = CC_REFRESH_BEEP;
        }
        rval = hist_get(el);
        if (rval == CC_REFRESH)
                return beep;
        return rval;

}


/* ed_search_prev_history():
 *      Search previous in history for a line matching the current
 *      next search history [M-P] [K]
 */
protected el_action_t
ed_search_prev_history(EditLine *el, wint_t c __attribute__((__unused__)))
{
        const wchar_t *hp;
        int h;
        int found = 0;

        el->el_chared.c_vcmd.action = NOP;
        el->el_chared.c_undo.len = -1;
        *el->el_line.lastchar = '\0';   /* just in case */
        if (el->el_history.eventno < 0) {
#ifdef DEBUG_EDIT
                (void) fprintf(el->el_errfile,
                    "e_prev_search_hist(): eventno < 0;\n");
#endif
                el->el_history.eventno = 0;
                return CC_ERROR;
        }
        if (el->el_history.eventno == 0) {
                (void) wcsncpy(el->el_history.buf, el->el_line.buffer,
                    EL_BUFSIZ);
                el->el_history.last = el->el_history.buf +
                    (el->el_line.lastchar - el->el_line.buffer);
        }
        if (el->el_history.ref == NULL)
                return CC_ERROR;

        hp = HIST_FIRST(el);
        if (hp == NULL)
                return CC_ERROR;

        c_setpat(el);           /* Set search pattern !! */

        for (h = 1; h <= el->el_history.eventno; h++)
                hp = HIST_NEXT(el);

        while (hp != NULL) {
#ifdef SDEBUG
                (void) fprintf(el->el_errfile, "Comparing with \"%s\"\n", hp);
#endif
                if ((wcsncmp(hp, el->el_line.buffer, (size_t)
                            (el->el_line.lastchar - el->el_line.buffer)) ||
                        hp[el->el_line.lastchar - el->el_line.buffer]) &&
                    c_hmatch(el, hp)) {
                        found = 1;
                        break;
                }
                h++;
                hp = HIST_NEXT(el);
        }

        if (!found) {
#ifdef SDEBUG
                (void) fprintf(el->el_errfile, "not found\n");
#endif
                return CC_ERROR;
        }
        el->el_history.eventno = h;

        return hist_get(el);
}


/* ed_search_next_history():
 *      Search next in history for a line matching the current
 *      [M-N] [J]
 */
protected el_action_t
ed_search_next_history(EditLine *el, wint_t c __attribute__((__unused__)))
{
        const wchar_t *hp;
        int h;
        int found = 0;

        el->el_chared.c_vcmd.action = NOP;
        el->el_chared.c_undo.len = -1;
        *el->el_line.lastchar = '\0';   /* just in case */

        if (el->el_history.eventno == 0)
                return CC_ERROR;

        if (el->el_history.ref == NULL)
                return CC_ERROR;

        hp = HIST_FIRST(el);
        if (hp == NULL)
                return CC_ERROR;

        c_setpat(el);           /* Set search pattern !! */

        for (h = 1; h < el->el_history.eventno && hp; h++) {
#ifdef SDEBUG
                (void) fprintf(el->el_errfile, "Comparing with \"%s\"\n", hp);
#endif
                if ((wcsncmp(hp, el->el_line.buffer, (size_t)
                            (el->el_line.lastchar - el->el_line.buffer)) ||
                        hp[el->el_line.lastchar - el->el_line.buffer]) &&
                    c_hmatch(el, hp))
                        found = h;
                hp = HIST_NEXT(el);
        }

        if (!found) {           /* is it the current history number? */
                if (!c_hmatch(el, el->el_history.buf)) {
#ifdef SDEBUG
                        (void) fprintf(el->el_errfile, "not found\n");
#endif
                        return CC_ERROR;
                }
        }
        el->el_history.eventno = found;

        return hist_get(el);
}


/* ed_prev_line():
 *      Move up one line
 *      Could be [k] [^p]
 */
protected el_action_t
ed_prev_line(EditLine *el, wint_t c __attribute__((__unused__)))
{
        wchar_t *ptr;
        int nchars = c_hpos(el);

        /*
         * Move to the line requested
         */
        if (*(ptr = el->el_line.cursor) == '\n')
                ptr--;

        for (; ptr >= el->el_line.buffer; ptr--)
                if (*ptr == '\n' && --el->el_state.argument <= 0)
                        break;

        if (el->el_state.argument > 0)
                return CC_ERROR;

        /*
         * Move to the beginning of the line
         */
        for (ptr--; ptr >= el->el_line.buffer && *ptr != '\n'; ptr--)
                continue;

        /*
         * Move to the character requested
         */
        for (ptr++;
            nchars-- > 0 && ptr < el->el_line.lastchar && *ptr != '\n';
            ptr++)
                continue;

        el->el_line.cursor = ptr;
        return CC_CURSOR;
}


/* ed_next_line():
 *      Move down one line
 *      Could be [j] [^n]
 */
protected el_action_t
ed_next_line(EditLine *el, wint_t c __attribute__((__unused__)))
{
        wchar_t *ptr;
        int nchars = c_hpos(el);

        /*
         * Move to the line requested
         */
        for (ptr = el->el_line.cursor; ptr < el->el_line.lastchar; ptr++)
                if (*ptr == '\n' && --el->el_state.argument <= 0)
                        break;

        if (el->el_state.argument > 0)
                return CC_ERROR;

        /*
         * Move to the character requested
         */
        for (ptr++;
            nchars-- > 0 && ptr < el->el_line.lastchar && *ptr != '\n';
            ptr++)
                continue;

        el->el_line.cursor = ptr;
        return CC_CURSOR;
}


/* ed_command():
 *      Editline extended command
 *      [M-X] [:]
 */
protected el_action_t
ed_command(EditLine *el, wint_t c __attribute__((__unused__)))
{
        wchar_t tmpbuf[EL_BUFSIZ];
        int tmplen;

        tmplen = c_gets(el, tmpbuf, L"\n: ");
        terminal__putc(el, '\n');

        if (tmplen < 0 || (tmpbuf[tmplen] = 0, parse_line(el, tmpbuf)) == -1)
                terminal_beep(el);

        el->el_map.current = el->el_map.key;
        re_clear_display(el);
        return CC_REFRESH;
}