bracecomp.c

   1 /* bracecomp.c -- Complete a filename with the possible completions enclosed
   2    in csh-style braces such that the list of completions is available to the
   3    shell. */
   4
   5 /* Original version by tromey@cns.caltech.edu,  Fri Feb  7 1992. */
   6
   7 /* Copyright (C) 1993 Free Software Foundation, Inc.
   8
   9    This file is part of GNU Bash, the Bourne Again SHell.
  10
  11    Bash is free software; you can redistribute it and/or modify it under
  12    the terms of the GNU General Public License as published by the Free
  13    Software Foundation; either version 2, or (at your option) any later
  14    version.
  15
  16    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  17    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19    for more details.
  20
  21    You should have received a copy of the GNU General Public License along
  22    with Bash; see the file COPYING.  If not, write to the Free Software
  23    Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  24
  25 #include "config.h"
  26 #if defined (BRACE_EXPANSION) && defined (READLINE)
  27
  28 #include <stdio.h>
  29
  30 #if defined (HAVE_UNISTD_H)
  31 #  ifdef _MINIX
  32 #    include <sys/types.h>
  33 #  endif
  34 #  include <unistd.h>
  35 #endif
  36
  37 #include "bashansi.h"
  38
  39 #include "shell.h"
  40 #include <readline/readline.h>
  41
  42 extern char *sh_backslash_quote ();
  43
  44 /* Find greatest common prefix of two strings. */
  45 static int
  46 string_gcd (s1, s2)
  47      char *s1, *s2;
  48 {
  49   register int i;
  50
  51   if (s1 == NULL || s2 == NULL)
  52     return (0);
  53
  54   for (i = 0; *s1 && *s2; ++s1, ++s2, ++i)
  55     {
  56       if (*s1 != *s2)
  57         break;
  58     }
  59
  60   return (i);
  61 }
  62
  63 static char *
  64 really_munge_braces (array, real_start, real_end, gcd_zero)
  65      char **array;
  66      int real_start, real_end, gcd_zero;
  67 {
  68   int start, end, gcd;
  69   char *result, *subterm, *x;
  70   int result_size, flag, tlen;
  71
  72   flag = 0;
  73
  74   if (real_start == real_end)
  75     {
  76       x = array[real_start] ? sh_backslash_quote (array[real_start] + gcd_zero)
  77                             : sh_backslash_quote (array[0]);
  78       return x;
  79     }
  80
  81   result = xmalloc (result_size = 16);
  82   *result = '\0';
  83
  84   for (start = real_start; start < real_end; start = end + 1)
  85     {
  86       gcd = strlen (array[start]);
  87       for (end = start + 1; end < real_end; end++)
  88         {
  89           int temp;
  90
  91           temp = string_gcd (array[start], array[end]);
  92
  93           if (temp <= gcd_zero)
  94             break;
  95
  96           gcd = temp;
  97         }
  98       end--;
  99
 100       if (gcd_zero == 0 && start == real_start && end != (real_end - 1))
 101         {
 102           /* In this case, add in a leading '{', because we are at
 103              top level, and there isn't a consistent prefix. */
 104           result_size += 1;
 105           result = xrealloc (result, result_size);
 106           result[0] = '{'; result[1] = '\0';
 107           flag++;
 108         }
 109
 110       /* Make sure we backslash quote every substring we insert into the
 111          resultant brace expression.  This is so the default filename
 112          quoting function won't inappropriately quote the braces. */
 113       if (start == end)
 114         {
 115           x = savestring (array[start] + gcd_zero);
 116           subterm = sh_backslash_quote (x);
 117           free (x);
 118         }
 119       else
 120         {
 121           /* If there is more than one element in the subarray,
 122              insert the (quoted) prefix and an opening brace. */
 123           tlen = gcd - gcd_zero;
 124           x = xmalloc (tlen + 1);
 125           strncpy (x, array[start] + gcd_zero, tlen);
 126           x[tlen] = '\0';
 127           subterm = sh_backslash_quote (x);
 128           free (x);
 129           result_size += strlen (subterm) + 1;
 130           result = xrealloc (result, result_size);
 131           strcat (result, subterm);
 132           free (subterm);
 133           strcat (result, "{");
 134           subterm = really_munge_braces (array, start, end + 1, gcd);
 135           subterm[strlen (subterm) - 1] = '}';
 136         }
 137
 138       result_size += strlen (subterm) + 1;
 139       result = xrealloc (result, result_size);
 140       strcat (result, subterm);
 141       strcat (result, ",");
 142       free (subterm);
 143     }
 144
 145   if (gcd_zero == 0)
 146     result[strlen (result) - 1] = flag ? '}' : '\0';
 147   return (result);
 148 }
 149
 150 static int
 151 hack_braces_completion (names)
 152      char **names;
 153 {
 154   register int i;
 155   char *temp;
 156
 157   temp = really_munge_braces (names, 1, array_len (names), 0);
 158
 159   for (i = 0; names[i]; ++i)
 160     {
 161       free (names[i]);
 162       names[i] = NULL;
 163     }
 164   names[0] = temp;
 165   return 0;
 166 }
 167
 168 /* We handle quoting ourselves within hack_braces_completion, so we turn off
 169    rl_filename_quoting_desired and rl_filename_quoting_function. */
 170 int
 171 bash_brace_completion (count, ignore)
 172      int count, ignore;
 173 {
 174   rl_compignore_func_t *orig_ignore_func;
 175   rl_compentry_func_t *orig_entry_func;
 176   rl_quote_func_t *orig_quoting_func;
 177   rl_completion_func_t *orig_attempt_func;
 178   int orig_quoting_desired, r;
 179
 180   orig_ignore_func = rl_ignore_some_completions_function;
 181   orig_attempt_func = rl_attempted_completion_function;
 182   orig_entry_func = rl_completion_entry_function;
 183   orig_quoting_func = rl_filename_quoting_function;
 184   orig_quoting_desired = rl_filename_quoting_desired;
 185
 186   rl_completion_entry_function = rl_filename_completion_function;
 187   rl_attempted_completion_function = (rl_completion_func_t *)NULL;
 188   rl_ignore_some_completions_function = hack_braces_completion;
 189   rl_filename_quoting_function = (rl_quote_func_t *)NULL;
 190   rl_filename_quoting_desired = 0;
 191
 192   r = rl_complete_internal (TAB);
 193
 194   rl_ignore_some_completions_function = orig_ignore_func;
 195   rl_attempted_completion_function = orig_attempt_func;
 196   rl_completion_entry_function = orig_entry_func;
 197   rl_filename_quoting_function = orig_quoting_func;
 198   rl_filename_quoting_desired = orig_quoting_desired;
 199
 200   return r;
 201 }
 202 #endif /* BRACE_EXPANSION && READLINE */