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/* bracecomp.c -- Complete a filename with the possible completions enclosed
in csh-style braces such that the list of completions is available to the
shell. */
/* Original version by tromey@cns.caltech.edu, Fri Feb 7 1992. */
/* Copyright (C) 1993-2020 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#if defined (BRACE_EXPANSION) && defined (READLINE)
#include <stdio.h>
#if defined (HAVE_UNISTD_H)
# ifdef _MINIX
# include <sys/types.h>
# endif
# include <unistd.h>
#endif
#include "bashansi.h"
#include "shmbutil.h"
#include "shell.h"
#include <readline/readline.h>
static int _strcompare PARAMS((char **, char **));
/* Find greatest common prefix of two strings. */
static int
string_gcd (s1, s2)
char *s1, *s2;
{
register int i;
if (s1 == NULL || s2 == NULL)
return (0);
for (i = 0; *s1 && *s2; ++s1, ++s2, ++i)
{
if (*s1 != *s2)
break;
}
return (i);
}
static char *
really_munge_braces (array, real_start, real_end, gcd_zero)
char **array;
int real_start, real_end, gcd_zero;
{
int start, end, gcd;
char *result, *subterm, *x;
int result_size, flag, tlen;
flag = 0;
if (real_start == real_end)
{
x = array[real_start] ? sh_backslash_quote (array[real_start] + gcd_zero, 0, 0)
: sh_backslash_quote (array[0], 0, 0);
return x;
}
result = (char *)xmalloc (result_size = 16);
*result = '\0';
for (start = real_start; start < real_end; start = end + 1)
{
gcd = strlen (array[start]);
for (end = start + 1; end < real_end; end++)
{
int temp;
temp = string_gcd (array[start], array[end]);
if (temp <= gcd_zero)
break;
gcd = temp;
}
end--;
if (gcd_zero == 0 && start == real_start && end != (real_end - 1))
{
/* In this case, add in a leading '{', because we are at
top level, and there isn't a consistent prefix. */
result_size += 1;
result = (char *)xrealloc (result, result_size);
result[0] = '{'; result[1] = '\0';
flag++;
}
/* Make sure we backslash quote every substring we insert into the
resultant brace expression. This is so the default filename
quoting function won't inappropriately quote the braces. */
if (start == end)
{
x = savestring (array[start] + gcd_zero);
subterm = sh_backslash_quote (x, 0, 0);
free (x);
}
else
{
/* If there is more than one element in the subarray,
insert the (quoted) prefix and an opening brace. */
tlen = gcd - gcd_zero;
x = (char *)xmalloc (tlen + 1);
strncpy (x, array[start] + gcd_zero, tlen);
x[tlen] = '\0';
subterm = sh_backslash_quote (x, 0, 0);
free (x);
result_size += strlen (subterm) + 1;
result = (char *)xrealloc (result, result_size);
strcat (result, subterm);
free (subterm);
strcat (result, "{");
subterm = really_munge_braces (array, start, end + 1, gcd);
subterm[strlen (subterm) - 1] = '}';
}
result_size += strlen (subterm) + 1;
result = (char *)xrealloc (result, result_size);
strcat (result, subterm);
strcat (result, ",");
free (subterm);
}
if (gcd_zero == 0)
result[strlen (result) - 1] = flag ? '}' : '\0';
return (result);
}
static int
_strcompare (s1, s2)
char **s1, **s2;
{
int result;
result = **s1 - **s2;
if (result == 0)
result = strcmp (*s1, *s2);
return result;
}
static int
hack_braces_completion (names)
char **names;
{
register int i;
char *temp;
i = strvec_len (names);
if (MB_CUR_MAX > 1 && i > 2)
qsort (names+1, i-1, sizeof (char *), (QSFUNC *)_strcompare);
temp = really_munge_braces (names, 1, i, 0);
for (i = 0; names[i]; ++i)
{
free (names[i]);
names[i] = NULL;
}
names[0] = temp;
return 0;
}
/* We handle quoting ourselves within hack_braces_completion, so we turn off
rl_filename_quoting_desired and rl_filename_quoting_function. */
int
bash_brace_completion (count, ignore)
int count, ignore;
{
rl_compignore_func_t *orig_ignore_func;
rl_compentry_func_t *orig_entry_func;
rl_quote_func_t *orig_quoting_func;
rl_completion_func_t *orig_attempt_func;
int orig_quoting_desired, r;
orig_ignore_func = rl_ignore_some_completions_function;
orig_attempt_func = rl_attempted_completion_function;
orig_entry_func = rl_completion_entry_function;
orig_quoting_func = rl_filename_quoting_function;
orig_quoting_desired = rl_filename_quoting_desired;
rl_completion_entry_function = rl_filename_completion_function;
rl_attempted_completion_function = (rl_completion_func_t *)NULL;
rl_ignore_some_completions_function = hack_braces_completion;
rl_filename_quoting_function = (rl_quote_func_t *)NULL;
rl_filename_quoting_desired = 0;
r = rl_complete_internal (TAB);
rl_ignore_some_completions_function = orig_ignore_func;
rl_attempted_completion_function = orig_attempt_func;
rl_completion_entry_function = orig_entry_func;
rl_filename_quoting_function = orig_quoting_func;
rl_filename_quoting_desired = orig_quoting_desired;
return r;
}
#endif /* BRACE_EXPANSION && READLINE */
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