/*      $NetBSD: filecomplete.c,v 1.73 2023/04/25 17:51:32 christos Exp $       */

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jaromir Dolecek.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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"
#if !defined(lint) && !defined(SCCSID)
__RCSID("$NetBSD: filecomplete.c,v 1.73 2023/04/25 17:51:32 christos Exp $");
#endif /* not lint && not SCCSID */

#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "el.h"
#include "filecomplete.h"

static const wchar_t break_chars[] = L" \t\n\"\\'`@$><=;|&{(";

/********************************/
/* completion functions */

/*
 * does tilde expansion of strings of type ``~user/foo''
 * if ``user'' isn't valid user name or ``txt'' doesn't start
 * w/ '~', returns pointer to strdup()ed copy of ``txt''
 *
 * it's the caller's responsibility to free() the returned string
 */
char *
fn_tilde_expand(const char *txt)
{
#if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
        struct passwd pwres;
        char pwbuf[1024];
#endif
        struct passwd *pass;
        const char *pos;
        char *temp;
        size_t len = 0;

        if (txt[0] != '~')
                return strdup(txt);

        pos = strchr(txt + 1, '/');
        if (pos == NULL) {
                temp = strdup(txt + 1);
                if (temp == NULL)
                        return NULL;
        } else {
                /* text until string after slash */
                len = (size_t)(pos - txt + 1);
                temp = el_calloc(len, sizeof(*temp));
                if (temp == NULL)
                        return NULL;
                (void)strlcpy(temp, txt + 1, len - 1);
        }
        if (temp[0] == 0) {
#ifdef HAVE_GETPW_R_POSIX
                if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
                    &pass) != 0)
                        pass = NULL;
#elif HAVE_GETPW_R_DRAFT
                pass = getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf));
#else
                pass = getpwuid(getuid());
#endif
        } else {
#ifdef HAVE_GETPW_R_POSIX
                if (getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf), &pass) != 0)
                        pass = NULL;
#elif HAVE_GETPW_R_DRAFT
                pass = getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf));
#else
                pass = getpwnam(temp);
#endif
        }
        el_free(temp);          /* value no more needed */
        if (pass == NULL)
                return strdup(txt);

        /* update pointer txt to point at string immedially following */
        /* first slash */
        txt += len;

        len = strlen(pass->pw_dir) + 1 + strlen(txt) + 1;
        temp = el_calloc(len, sizeof(*temp));
        if (temp == NULL)
                return NULL;
        (void)snprintf(temp, len, "%s/%s", pass->pw_dir, txt);

        return temp;
}

static int
needs_escaping(wchar_t c)
{
        switch (c) {
        case '\'':
        case '"':
        case '(':
        case ')':
        case '\\':
        case '<':
        case '>':
        case '$':
        case '#':
        case ' ':
        case '\n':
        case '\t':
        case '?':
        case ';':
        case '`':
        case '@':
        case '=':
        case '|':
        case '{':
        case '}':
        case '&':
        case '*':
        case '[':
                return 1;
        default:
                return 0;
        }
}

static int
needs_dquote_escaping(char c)
{
        switch (c) {
        case '"':
        case '\\':
        case '`':
        case '$':
                return 1;
        default:
                return 0;
        }
}


static wchar_t *
unescape_string(const wchar_t *string, size_t length)
{
        size_t i;
        size_t j = 0;
        wchar_t *unescaped = el_calloc(length + 1, sizeof(*string));
        if (unescaped == NULL)
                return NULL;
        for (i = 0; i < length ; i++) {
                if (string[i] == '\\')
                        continue;
                unescaped[j++] = string[i];
        }
        unescaped[j] = 0;
        return unescaped;
}

static char *
escape_filename(EditLine * el, const char *filename, int single_match,
                const char *(*app_func)(const char *))
{
        size_t original_len = 0;
        size_t escaped_character_count = 0;
        size_t offset = 0;
        size_t newlen;
        const char *s;
        char c;
        size_t s_quoted = 0;    /* does the input contain a single quote */
        size_t d_quoted = 0;    /* does the input contain a double quote */
        char *escaped_str;
        wchar_t *temp = el->el_line.buffer;
        const char *append_char = NULL;

        if (filename == NULL)
                return NULL;

        while (temp != el->el_line.cursor) {
                /*
                 * If we see a single quote but have not seen a double quote
                 * so far set/unset s_quote, unless it is already quoted
                 */
                if (temp[0] == '\'' && !d_quoted &&
                    (temp == el->el_line.buffer || temp[-1] != '\\'))
                        s_quoted = !s_quoted;
                /*
                 * vice versa to the above condition
                 */
                else if (temp[0] == '"' && !s_quoted)
                        d_quoted = !d_quoted;
                temp++;
        }

        /* Count number of special characters so that we can calculate
         * number of extra bytes needed in the new string
         */
        for (s = filename; *s; s++, original_len++) {
                c = *s;
                /* Inside a single quote only single quotes need escaping */
                if (s_quoted && c == '\'') {
                        escaped_character_count += 3;
                        continue;
                }
                /* Inside double quotes only ", \, ` and $ need escaping */
                if (d_quoted && needs_dquote_escaping(c)) {
                        escaped_character_count++;
                        continue;
                }
                if (!s_quoted && !d_quoted && needs_escaping(c))
                        escaped_character_count++;
        }

        newlen = original_len + escaped_character_count + 1;
        if (s_quoted || d_quoted)
                newlen++;

        if (single_match && app_func)
                newlen++;

        if ((escaped_str = el_malloc(newlen)) == NULL)
                return NULL;

        for (s = filename; *s; s++) {
                c = *s;
                if (!needs_escaping(c)) {
                        /* no escaping is required continue as usual */
                        escaped_str[offset++] = c;
                        continue;
                }

                /* single quotes inside single quotes require special handling */
                if (c == '\'' && s_quoted) {
                        escaped_str[offset++] = '\'';
                        escaped_str[offset++] = '\\';
                        escaped_str[offset++] = '\'';
                        escaped_str[offset++] = '\'';
                        continue;
                }

                /* Otherwise no escaping needed inside single quotes */
                if (s_quoted) {
                        escaped_str[offset++] = c;
                        continue;
                }

                /* No escaping needed inside a double quoted string either
                 * unless we see a '$', '\', '`', or '"' (itself)
                 */
                if (d_quoted && !needs_dquote_escaping(c)) {
                        escaped_str[offset++] = c;
                        continue;
                }

                /* If we reach here that means escaping is actually needed */
                escaped_str[offset++] = '\\';
                escaped_str[offset++] = c;
        }

        if (single_match && app_func) {
                escaped_str[offset] = 0;
                append_char = app_func(filename);
                /* we want to append space only if we are not inside quotes */
                if (append_char[0] == ' ') {
                        if (!s_quoted && !d_quoted)
                                escaped_str[offset++] = append_char[0];
                } else
                        escaped_str[offset++] = append_char[0];
        }

        /* close the quotes if single match and the match is not a directory */
        if (single_match && (append_char && append_char[0] == ' ')) { 
                if (s_quoted)
                        escaped_str[offset++] = '\'';
                else if (d_quoted)
                        escaped_str[offset++] = '"';
        }

        escaped_str[offset] = 0;
        return escaped_str;
}

/*
 * return first found file name starting by the ``text'' or NULL if no
 * such file can be found
 * value of ``state'' is ignored
 *
 * it's the caller's responsibility to free the returned string
 */
char *
fn_filename_completion_function(const char *text, int state)
{
        static DIR *dir = NULL;
        static char *filename = NULL, *dirname = NULL, *dirpath = NULL;
        static size_t filename_len = 0;
        struct dirent *entry;
        char *temp;
        const char *pos;
        size_t len;

        if (state == 0 || dir == NULL) {
                pos = strrchr(text, '/');
                if (pos) {
                        char *nptr;
                        pos++;
                        nptr = el_realloc(filename, (strlen(pos) + 1) *
                            sizeof(*nptr));
                        if (nptr == NULL) {
                                el_free(filename);
                                filename = NULL;
                                return NULL;
                        }
                        filename = nptr;
                        (void)strcpy(filename, pos);
                        len = (size_t)(pos - text);     /* including last slash */

                        nptr = el_realloc(dirname, (len + 1) *
                            sizeof(*nptr));
                        if (nptr == NULL) {
                                el_free(dirname);
                                dirname = NULL;
                                return NULL;
                        }
                        dirname = nptr;
                        (void)strlcpy(dirname, text, len + 1);
                } else {
                        el_free(filename);
                        if (*text == 0)
                                filename = NULL;
                        else {
                                filename = strdup(text);
                                if (filename == NULL)
                                        return NULL;
                        }
                        el_free(dirname);
                        dirname = NULL;
                }

                if (dir != NULL) {
                        (void)closedir(dir);
                        dir = NULL;
                }

                /* support for ``~user'' syntax */

                el_free(dirpath);
                dirpath = NULL;
                if (dirname == NULL) {
                        if ((dirname = strdup("")) == NULL)
                                return NULL;
                        dirpath = strdup("./");
                } else if (*dirname == '~')
                        dirpath = fn_tilde_expand(dirname);
                else
                        dirpath = strdup(dirname);

                if (dirpath == NULL)
                        return NULL;

                dir = opendir(dirpath);
                if (!dir)
                        return NULL;    /* cannot open the directory */

                /* will be used in cycle */
                filename_len = filename ? strlen(filename) : 0;
        }

        /* find the match */
        while ((entry = readdir(dir)) != NULL) {
                /* skip . and .. */
                if (entry->d_name[0] == '.' && (!entry->d_name[1]
                    || (entry->d_name[1] == '.' && !entry->d_name[2])))
                        continue;
                if (filename_len == 0)
                        break;
                /* otherwise, get first entry where first */
                /* filename_len characters are equal      */
                if (entry->d_name[0] == filename[0]
#if HAVE_STRUCT_DIRENT_D_NAMLEN
                    && entry->d_namlen >= filename_len
#else
                    && strlen(entry->d_name) >= filename_len
#endif
                    && strncmp(entry->d_name, filename,
                        filename_len) == 0)
                        break;
        }

        if (entry) {            /* match found */

#if HAVE_STRUCT_DIRENT_D_NAMLEN
                len = entry->d_namlen;
#else
                len = strlen(entry->d_name);
#endif

                len = strlen(dirname) + len + 1;
                temp = el_calloc(len, sizeof(*temp));
                if (temp == NULL)
                        return NULL;
                (void)snprintf(temp, len, "%s%s", dirname, entry->d_name);
        } else {
                (void)closedir(dir);
                dir = NULL;
                temp = NULL;
        }

        return temp;
}


static const char *
append_char_function(const char *name)
{
        struct stat stbuf;
        char *expname = *name == '~' ? fn_tilde_expand(name) : NULL;
        const char *rs = " ";

        if (stat(expname ? expname : name, &stbuf) == -1)
                goto out;
        if (S_ISDIR(stbuf.st_mode))
                rs = "/";
out:
        if (expname)
                el_free(expname);
        return rs;
}

/*
 * returns list of completions for text given
 * non-static for readline.
 */
char **
completion_matches(const char *text, char *(*genfunc)(const char *, int))
{
        char **match_list = NULL, *retstr, *prevstr;
        size_t match_list_len, max_equal, which, i;
        size_t matches;

        matches = 0;
        match_list_len = 1;
        while ((retstr = (*genfunc) (text, (int)matches)) != NULL) {
                /* allow for list terminator here */
                if (matches + 3 >= match_list_len) {
                        char **nmatch_list;
                        while (matches + 3 >= match_list_len)
                                match_list_len <<= 1;
                        nmatch_list = el_realloc(match_list,
                            match_list_len * sizeof(*nmatch_list));
                        if (nmatch_list == NULL) {
                                el_free(match_list);
                                return NULL;
                        }
                        match_list = nmatch_list;

                }
                match_list[++matches] = retstr;
        }

        if (!match_list)
                return NULL;    /* nothing found */

        /* find least denominator and insert it to match_list[0] */
        which = 2;
        prevstr = match_list[1];
        max_equal = strlen(prevstr);
        for (; which <= matches; which++) {
                for (i = 0; i < max_equal &&
                    prevstr[i] == match_list[which][i]; i++)
                        continue;
                max_equal = i;
        }

        retstr = el_calloc(max_equal + 1, sizeof(*retstr));
        if (retstr == NULL) {
                el_free(match_list);
                return NULL;
        }
        (void)strlcpy(retstr, match_list[1], max_equal + 1);
        match_list[0] = retstr;

        /* add NULL as last pointer to the array */
        match_list[matches + 1] = NULL;

        return match_list;
}

/*
 * Sort function for qsort(). Just wrapper around strcasecmp().
 */
static int
_fn_qsort_string_compare(const void *i1, const void *i2)
{
        const char *s1 = ((const char * const *)i1)[0];
        const char *s2 = ((const char * const *)i2)[0];

        return strcasecmp(s1, s2);
}

/*
 * Display list of strings in columnar format on readline's output stream.
 * 'matches' is list of strings, 'num' is number of strings in 'matches',
 * 'width' is maximum length of string in 'matches'.
 *
 * matches[0] is not one of the match strings, but it is counted in
 * num, so the strings are matches[1] *through* matches[num-1].
 */
void
fn_display_match_list(EditLine * el, char **matches, size_t num, size_t width,
    const char *(*app_func) (const char *))
{
        size_t line, lines, col, cols, thisguy;
        int screenwidth = el->el_terminal.t_size.h;
        if (app_func == NULL)
                app_func = append_char_function;

        /* Ignore matches[0]. Avoid 1-based array logic below. */
        matches++;
        num--;

        /*
         * Find out how many entries can be put on one line; count
         * with one space between strings the same way it's printed.
         */
        cols = (size_t)screenwidth / (width + 2);
        if (cols == 0)
                cols = 1;

        /* how many lines of output, rounded up */
        lines = (num + cols - 1) / cols;

        /* Sort the items. */
        qsort(matches, num, sizeof(char *), _fn_qsort_string_compare);

        /*
         * On the ith line print elements i, i+lines, i+lines*2, etc.
         */
        for (line = 0; line < lines; line++) {
                for (col = 0; col < cols; col++) {
                        thisguy = line + col * lines;
                        if (thisguy >= num)
                                break;
                        (void)fprintf(el->el_outfile, "%s%s%s",
                            col == 0 ? "" : " ", matches[thisguy],
                                (*app_func)(matches[thisguy]));
                        (void)fprintf(el->el_outfile, "%-*s",
                                (int) (width - strlen(matches[thisguy])), "");
                }
                (void)fprintf(el->el_outfile, "\n");
        }
}

static wchar_t *
find_word_to_complete(const wchar_t * cursor, const wchar_t * buffer,
    const wchar_t * word_break, const wchar_t * special_prefixes, size_t * length,
        int do_unescape)
{
        /* We now look backwards for the start of a filename/variable word */
        const wchar_t *ctemp = cursor;
        wchar_t *temp;
        size_t len;

        /* if the cursor is placed at a slash or a quote, we need to find the
         * word before it
         */
        if (ctemp > buffer) {
                switch (ctemp[-1]) {
                case '\\':
                case '\'':
                case '"':
                        ctemp--;
                        break;
                default:
                        break;
                }
        }

        for (;;) {
                if (ctemp <= buffer)
                        break;
                if (ctemp - buffer >= 2 && ctemp[-2] == '\\' &&
                    needs_escaping(ctemp[-1])) {
                        ctemp -= 2;
                        continue;
                }
                if (wcschr(word_break, ctemp[-1]))
                        break;
                if (special_prefixes && wcschr(special_prefixes, ctemp[-1]))
                        break;
                ctemp--;
        }

        len = (size_t) (cursor - ctemp);
        if (len == 1 && (ctemp[0] == '\'' || ctemp[0] == '"')) {
                len = 0;
                ctemp++;
        }
        *length = len;
        if (do_unescape) {
                wchar_t *unescaped_word = unescape_string(ctemp, len);
                if (unescaped_word == NULL)
                        return NULL;
                return unescaped_word;
        }
        temp = el_malloc((len + 1) * sizeof(*temp));
        if (temp == NULL)
                return NULL;
        (void) wcsncpy(temp, ctemp, len);
        temp[len] = '\0';
        return temp;
}

/*
 * Complete the word at or before point,
 * 'what_to_do' says what to do with the completion.
 * \t   means do standard completion.
 * `?' means list the possible completions.
 * `*' means insert all of the possible completions.
 * `!' means to do standard completion, and list all possible completions if
 * there is more than one.
 *
 * Note: '*' support is not implemented
 *       '!' could never be invoked
 */
int
fn_complete2(EditLine *el,
    char *(*complete_func)(const char *, int),
    char **(*attempted_completion_function)(const char *, int, int),
    const wchar_t *word_break, const wchar_t *special_prefixes,
    const char *(*app_func)(const char *), size_t query_items,
    int *completion_type, int *over, int *point, int *end,
    unsigned int flags)
{
        const LineInfoW *li;
        wchar_t *temp;
        char **matches;
        char *completion;
        size_t len;
        int what_to_do = '\t';
        int retval = CC_NORM;
        int do_unescape = flags & FN_QUOTE_MATCH;

        if (el->el_state.lastcmd == el->el_state.thiscmd)
                what_to_do = '?';

        /* readline's rl_complete() has to be told what we did... */
        if (completion_type != NULL)
                *completion_type = what_to_do;

        if (!complete_func)
                complete_func = fn_filename_completion_function;
        if (!app_func)
                app_func = append_char_function;

        li = el_wline(el);
        temp = find_word_to_complete(li->cursor,
            li->buffer, word_break, special_prefixes, &len, do_unescape);
        if (temp == NULL)
                goto out;

        /* these can be used by function called in completion_matches() */
        /* or (*attempted_completion_function)() */
        if (point != NULL)
                *point = (int)(li->cursor - li->buffer);
        if (end != NULL)
                *end = (int)(li->lastchar - li->buffer);

        if (attempted_completion_function) {
                int cur_off = (int)(li->cursor - li->buffer);
                matches = (*attempted_completion_function)(
                    ct_encode_string(temp, &el->el_scratch),
                    cur_off - (int)len, cur_off);
        } else
                matches = NULL;
        if (!attempted_completion_function ||
            (over != NULL && !*over && !matches))
                matches = completion_matches(
                    ct_encode_string(temp, &el->el_scratch), complete_func);

        if (over != NULL)
                *over = 0;

        if (matches == NULL) {
                goto out;
        }
        int i;
        size_t matches_num, maxlen, match_len, match_display=1;
        int single_match = matches[2] == NULL &&
                (matches[1] == NULL || strcmp(matches[0], matches[1]) == 0);

        retval = CC_REFRESH;

        if (matches[0][0] != '\0') {
                el_deletestr(el, (int)len);
                if (flags & FN_QUOTE_MATCH)
                        completion = escape_filename(el, matches[0],
                            single_match, app_func);
                else
                        completion = strdup(matches[0]);
                if (completion == NULL)
                        goto out2;

                /*
                 * Replace the completed string with the common part of
                 * all possible matches if there is a possible completion.
                 */
                el_winsertstr(el,
                    ct_decode_string(completion, &el->el_scratch));

                if (single_match && attempted_completion_function &&
                    !(flags & FN_QUOTE_MATCH))
                {
                        /*
                         * We found an exact match. Add a space after
                         * it, unless we do filename completion and the
                         * object is a directory. Also do necessary
                         * escape quoting
                         */
                        el_winsertstr(el, ct_decode_string(
                            (*app_func)(completion), &el->el_scratch));
                }
                free(completion);
        }


        if (!single_match && (what_to_do == '!' || what_to_do == '?')) {
                /*
                 * More than one match and requested to list possible
                 * matches.
                 */

                for(i = 1, maxlen = 0; matches[i]; i++) {
                        match_len = strlen(matches[i]);
                        if (match_len > maxlen)
                                maxlen = match_len;
                }
                /* matches[1] through matches[i-1] are available */
                matches_num = (size_t)(i - 1);

                /* newline to get on next line from command line */
                (void)fprintf(el->el_outfile, "\n");

                /*
                 * If there are too many items, ask user for display
                 * confirmation.
                 */
                if (matches_num > query_items) {
                        (void)fprintf(el->el_outfile,
                            "Display all %zu possibilities? (y or n) ",
                            matches_num);
                        (void)fflush(el->el_outfile);
                        if (getc(stdin) != 'y')
                                match_display = 0;
                        (void)fprintf(el->el_outfile, "\n");
                }

                if (match_display) {
                        /*
                         * Interface of this function requires the
                         * strings be matches[1..num-1] for compat.
                         * We have matches_num strings not counting
                         * the prefix in matches[0], so we need to
                         * add 1 to matches_num for the call.
                         */
                        fn_display_match_list(el, matches,
                            matches_num+1, maxlen, app_func);
                }
                retval = CC_REDISPLAY;
        } else if (matches[0][0]) {
                /*
                 * There was some common match, but the name was
                 * not complete enough. Next tab will print possible
                 * completions.
                 */
                el_beep(el);
        } else {
                /* lcd is not a valid object - further specification */
                /* is needed */
                el_beep(el);
                retval = CC_NORM;
        }

        /* free elements of array and the array itself */
out2:
        for (i = 0; matches[i]; i++)
                el_free(matches[i]);
        el_free(matches);
        matches = NULL;

out:
        el_free(temp);
        return retval;
}

int
fn_complete(EditLine *el,
    char *(*complete_func)(const char *, int),
    char **(*attempted_completion_function)(const char *, int, int),
    const wchar_t *word_break, const wchar_t *special_prefixes,
    const char *(*app_func)(const char *), size_t query_items,
    int *completion_type, int *over, int *point, int *end)
{
        return fn_complete2(el, complete_func, attempted_completion_function,
            word_break, special_prefixes, app_func, query_items,
            completion_type, over, point, end,
            attempted_completion_function ? 0 : FN_QUOTE_MATCH);
}

/*
 * el-compatible wrapper around rl_complete; needed for key binding
 */
/* ARGSUSED */
unsigned char
_el_fn_complete(EditLine *el, int ch __attribute__((__unused__)))
{
        return (unsigned char)fn_complete(el, NULL, NULL,
            break_chars, NULL, NULL, (size_t)100,
            NULL, NULL, NULL, NULL);
}

/*
 * el-compatible wrapper around rl_complete; needed for key binding
 */
/* ARGSUSED */
unsigned char
_el_fn_sh_complete(EditLine *el, int ch)
{
        return _el_fn_complete(el, ch);
}