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- This file is help.def, from which is created help.c.
- It implements the builtin "help" in Bash.
-
- Copyright (C) 1987, 1989, 1991 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 1, 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; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $PRODUCES help.c
-
- $BUILTIN help
- $FUNCTION help_builtin
- $SHORT_DOC help [pattern ...]
- Display helpful information about builtin commands. If PATTERN is
- specified, gives detailed help on all commands matching PATTERN,
- otherwise a list of the builtins is printed.
- $END
-
- #include <stdio.h>
- #include "../shell.h"
- #include "../builtins.h"
-
- #if defined (USE_GLOB_LIBRARY)
- # include <glob/glob.h>
- #else
- # define FNM_NOMATCH 1
- #endif /* USE_GLOB_LIBRARY */
-
- /* Print out a list of the known functions in the shell, and what they do.
- If LIST is supplied, print out the list which matches for each pattern
- specified. */
- help_builtin (list)
- WORD_LIST *list;
- {
- if (!list)
- {
- register int i, j;
- char blurb[256];
-
- show_shell_version ();
- printf (
- "Shell commands that are defined internally. Type `help' to see this list.\n\
- Type `help name' to find out more about the function `name'.\n\
- Use `info bash' to find out more about the shell in general.\n\
- \n\
- A star (*) next to a name means that the command is disabled.\n\
- \n");
-
- for (i = 0; i < num_shell_builtins; i++)
- {
- QUIT;
- sprintf (blurb, "%c%s", shell_builtins[i].enabled ? ' ' : '*',
- shell_builtins[i].short_doc);
-
- blurb[35] = '\0';
- printf ("%s", blurb);
-
- if (i % 2)
- printf ("\n");
- else
- for (j = strlen (blurb); j < 35; j++)
- putc (' ', stdout);
-
- }
- if (i % 2)
- printf ("\n");
- }
- else
- {
- int match_found = 0;
- char *pattern = "";
-
- if (glob_pattern_p (list->word->word))
- {
- printf ("Shell commands matching keyword%s `",
- list->next ? "s" : "");
- print_word_list (list, ", ");
- printf ("'\n\n");
- }
-
- while (list)
- {
- register int i = 0, plen;
- char *name;
-
- pattern = list->word->word;
- plen = strlen (pattern);
-
- while (name = shell_builtins[i].name)
- {
- int doc_index;
-
- QUIT;
- if ((strnicmp (pattern, name, plen) == 0) ||
- (fnmatch (pattern, name, 0) != FNM_NOMATCH))
- {
- printf ("%s: %s\n", name, shell_builtins[i].short_doc);
-
- for (doc_index = 0;
- shell_builtins[i].long_doc[doc_index]; doc_index++)
- printf (" %s\n", shell_builtins[i].long_doc[doc_index]);
-
- match_found++;
- }
- i++;
- }
- list = list->next;
- }
-
- if (!match_found)
- {
- fprintf (stderr, "No help topics match `%s'. Try `help help'.\n",
- pattern);
- fflush (stderr);
- return (EXECUTION_FAILURE);
- }
- }
- fflush (stdout);
- return (EXECUTION_SUCCESS);
- }
-
-