This file is help.def, from which is created help.c.
It implements the builtin "help" in Bash.
-Copyright (C) 1987-2003 Free Software Foundation, Inc.
+Copyright (C) 1987-2009 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 2, or (at your option) any later
-version.
+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.
+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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
+You should have received a copy of the GNU General Public License
+along with Bash. If not, see <http://www.gnu.org/licenses/>.
$PRODUCES help.c
$BUILTIN help
$FUNCTION help_builtin
$DEPENDS_ON HELP_BUILTIN
-$SHORT_DOC help [-s] [pattern ...]
-Display helpful information about builtin commands. If PATTERN is
+$SHORT_DOC help [-ds] [pattern ...]
+Display information about builtin commands.
+
+Displays brief summaries of builtin commands. If PATTERN is
specified, gives detailed help on all commands matching PATTERN,
-otherwise a list of the builtins is printed. The -s option
-restricts the output for each builtin command matching PATTERN to
-a short usage synopsis.
+otherwise the list of help topics is printed.
+
+Options:
+ -d output short description for each topic
+ -m display usage in pseudo-manpage format
+ -s output only a short usage synopsis for each topic matching
+ PATTERN
+
+Arguments:
+ PATTERN Pattern specifiying a help topic
+
+Exit Status:
+Returns success unless PATTERN is not found or an invalid option is given.
$END
#include <config.h>
extern int errno;
#endif
+extern const char * const bash_copyright;
+extern const char * const bash_license;
+
static void show_builtin_command_help __P((void));
+static int open_helpfile __P((char *));
+static void show_desc __P((char *, int));
+static void show_manpage __P((char *, int));
static void show_longdoc __P((int));
/* Print out a list of the known functions in the shell, and what they do.
{
register int i;
char *pattern, *name;
- int plen, match_found, sflag;
+ int plen, match_found, sflag, dflag, mflag;
- sflag = 0;
+ dflag = sflag = mflag = 0;
reset_internal_getopt ();
- while ((i = internal_getopt (list, "s")) != -1)
+ while ((i = internal_getopt (list, "dms")) != -1)
{
switch (i)
{
+ case 'd':
+ dflag = 1;
+ break;
+ case 'm':
+ mflag = 1;
+ break;
case 's':
sflag = 1;
break;
if (glob_pattern_p (list->word->word))
{
- if (list->next)
- printf (_("Shell commands matching keywords `"));
- else
- printf (_("Shell commands matching keyword `"));
+ printf (ngettext ("Shell commands matching keyword `", "Shell commands matching keywords `", (list->next ? 2 : 1)));
print_word_list (list, ", ");
printf ("'\n\n");
}
if ((strncmp (pattern, name, plen) == 0) ||
(strmatch (pattern, name, FNMATCH_EXTFLAG) != FNM_NOMATCH))
{
+ match_found++;
+ if (dflag)
+ {
+ show_desc (name, i);
+ continue;
+ }
+ else if (mflag)
+ {
+ show_manpage (name, i);
+ continue;
+ }
+
printf ("%s: %s\n", name, shell_builtins[i].short_doc);
if (sflag == 0)
show_longdoc (i);
-
- match_found++;
}
}
}
return (EXECUTION_SUCCESS);
}
+static int
+open_helpfile (name)
+ char *name;
+{
+ int fd;
+
+ fd = open (name, O_RDONLY);
+ if (fd == -1)
+ {
+ builtin_error (_("%s: cannot open: %s"), name, strerror (errno));
+ return -1;
+ }
+ return fd;
+}
+
/* By convention, enforced by mkbuiltins.c, if separate help files are being
used, the long_doc array contains one string -- the full pathname of the
help file for this builtin. */
if (doc && doc[0] && *doc[0] == '/' && doc[1] == (char *)NULL)
{
- fd = open (doc[0], O_RDONLY);
- if (fd == -1)
- {
- builtin_error (_("%s: cannot open: %s"), doc[0], strerror (errno));
- return;
- }
+ fd = open_helpfile (doc[0]);
+ if (fd < 0)
+ return;
zcatfd (fd, 1, doc[0]);
close (fd);
}
printf ("%*s%s\n", BASE_INDENT, " ", _(doc[j]));
}
+static void
+show_desc (name, i)
+ char *name;
+ int i;
+{
+ register int j;
+ char **doc, *line;
+ int fd, usefile;
+
+ doc = (char **)shell_builtins[i].long_doc;
+
+ usefile = (doc && doc[0] && *doc[0] == '/' && doc[1] == (char *)NULL);
+ if (usefile)
+ {
+ fd = open_helpfile (doc[0]);
+ if (fd < 0)
+ return;
+ zmapfd (fd, &line, doc[0]);
+ close (fd);
+ }
+ else
+ line = doc ? doc[0] : (char *)NULL;
+
+ printf ("%s - ", name);
+ for (j = 0; line && line[j]; j++)
+ {
+ putchar (line[j]);
+ if (line[j] == '\n')
+ break;
+ }
+
+ fflush (stdout);
+
+ if (usefile)
+ free (line);
+}
+
+/* Print builtin help in pseudo-manpage format. */
+static void
+show_manpage (name, i)
+ char *name;
+ int i;
+{
+ register int j;
+ char **doc, *line;
+ int fd, usefile;
+
+ doc = (char **)shell_builtins[i].long_doc;
+
+ usefile = (doc && doc[0] && *doc[0] == '/' && doc[1] == (char *)NULL);
+ if (usefile)
+ {
+ fd = open_helpfile (doc[0]);
+ if (fd < 0)
+ return;
+ zmapfd (fd, &line, doc[0]);
+ close (fd);
+ }
+ else
+ line = doc ? _(doc[0]) : (char *)NULL;
+
+ /* NAME */
+ printf ("NAME\n");
+ printf ("%*s%s - ", BASE_INDENT, " ", name);
+ for (j = 0; line && line[j]; j++)
+ {
+ putchar (line[j]);
+ if (line[j] == '\n')
+ break;
+ }
+ printf ("\n");
+
+ /* SYNOPSIS */
+ printf ("SYNOPSIS\n");
+ printf ("%*s%s\n\n", BASE_INDENT, " ", shell_builtins[i].short_doc);
+
+ /* DESCRIPTION */
+ printf ("DESCRIPTION\n");
+ if (usefile == 0)
+ {
+ for (j = 0; doc[j]; j++)
+ printf ("%*s%s\n", BASE_INDENT, " ", _(doc[j]));
+ }
+ else
+ {
+ for (j = 0; line && line[j]; j++)
+ {
+ putchar (line[j]);
+ if (line[j] == '\n')
+ printf ("%*s", BASE_INDENT, " ");
+ }
+ }
+ putchar ('\n');
+
+ /* SEE ALSO */
+ printf ("SEE ALSO\n");
+ printf ("%*sbash(1)\n\n", BASE_INDENT, " ");
+
+ /* IMPLEMENTATION */
+ printf ("IMPLEMENTATION\n");
+ printf ("%*s", BASE_INDENT, " ");
+ show_shell_version (0);
+ printf ("%*s", BASE_INDENT, " ");
+ printf ("%s\n", _(bash_copyright));
+ printf ("%*s", BASE_INDENT, " ");
+ printf ("%s\n", _(bash_license));
+
+ fflush (stdout);
+ if (usefile)
+ free (line);
+}
+
static void
show_builtin_command_help ()
{
int i, j;
- char blurb[36];
+ int height, width;
+ char *t, blurb[128];
printf (
_("These shell commands are defined internally. Type `help' to see this list.\n\
A star (*) next to a name means that the command is disabled.\n\
\n"));
- for (i = 0; i < num_shell_builtins; i++)
+ t = get_string_value ("COLUMNS");
+ width = (t && *t) ? atoi (t) : 80;
+ if (width <= 0)
+ width = 80;
+
+ width /= 2;
+ if (width > sizeof (blurb))
+ width = sizeof (blurb);
+ height = (num_shell_builtins + 1) / 2; /* number of rows */
+
+ for (i = 0; i < height; i++)
{
QUIT;
+
+ /* first column */
blurb[0] = (shell_builtins[i].flags & BUILTIN_ENABLED) ? ' ' : '*';
- strncpy (blurb + 1, shell_builtins[i].short_doc, 34);
- blurb[35] = '\0';
+ strncpy (blurb + 1, shell_builtins[i].short_doc, width - 2);
+ blurb[width - 2] = '>'; /* indicate truncation */
+ blurb[width - 1] = '\0';
printf ("%s", blurb);
+ if (((i << 1) >= num_shell_builtins) || (i+height >= num_shell_builtins))
+ {
+ printf ("\n");
+ break;
+ }
+
+ /* two spaces */
+ for (j = strlen (blurb); j < width; j++)
+ putc (' ', stdout);
- if (i % 2)
- printf ("\n");
- else
- for (j = strlen (blurb); j < 35; j++)
- putc (' ', stdout);
+ /* second column */
+ blurb[0] = (shell_builtins[i+height].flags & BUILTIN_ENABLED) ? ' ' : '*';
+ strncpy (blurb + 1, shell_builtins[i+height].short_doc, width - 3);
+ blurb[width - 3] = '>'; /* indicate truncation */
+ blurb[width - 2] = '\0';
+ printf ("%s\n", blurb);
}
- if (i % 2)
- printf ("\n");
}
#endif /* HELP_BUILTIN */
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