105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/* help.c - command to show a help text. */
|
||
/*
|
||
* GRUB -- GRand Unified Bootloader
|
||
* Copyright (C) 2005,2007,2008 Free Software Foundation, Inc.
|
||
*
|
||
* GRUB 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.
|
||
*
|
||
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
#include <grub/dl.h>
|
||
#include <grub/misc.h>
|
||
#include <grub/term.h>
|
||
#include <grub/extcmd.h>
|
||
|
||
static grub_err_t
|
||
grub_cmd_help (grub_extcmd_t ext __attribute__ ((unused)), int argc,
|
||
char **args)
|
||
{
|
||
int cnt = 0;
|
||
char *currarg;
|
||
|
||
auto int print_command_info (grub_command_t cmd);
|
||
auto int print_command_help (grub_command_t cmd);
|
||
|
||
int print_command_info (grub_command_t cmd)
|
||
{
|
||
if ((cmd->prio & GRUB_PRIO_LIST_FLAG_ACTIVE) &&
|
||
(cmd->flags & GRUB_COMMAND_FLAG_CMDLINE))
|
||
{
|
||
char description[GRUB_TERM_WIDTH / 2];
|
||
int desclen = grub_strlen (cmd->summary);
|
||
|
||
/* Make a string with a length of GRUB_TERM_WIDTH / 2 - 1 filled
|
||
with the description followed by spaces. */
|
||
grub_memset (description, ' ', GRUB_TERM_WIDTH / 2 - 1);
|
||
description[GRUB_TERM_WIDTH / 2 - 1] = '\0';
|
||
grub_memcpy (description, cmd->summary,
|
||
(desclen < GRUB_TERM_WIDTH / 2 - 1
|
||
? desclen : GRUB_TERM_WIDTH / 2 - 1));
|
||
|
||
grub_printf ("%s%s", description, (cnt++) % 2 ? "\n" : " ");
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
int print_command_help (grub_command_t cmd)
|
||
{
|
||
if (cmd->prio & GRUB_PRIO_LIST_FLAG_ACTIVE)
|
||
{
|
||
if (! grub_strncmp (cmd->name, currarg, grub_strlen (currarg)))
|
||
{
|
||
if (cnt++ > 0)
|
||
grub_printf ("\n\n");
|
||
|
||
if (cmd->flags & GRUB_COMMAND_FLAG_EXTCMD)
|
||
grub_arg_show_help ((grub_extcmd_t) cmd->data);
|
||
else
|
||
grub_printf ("Usage: %s\n%s\b", cmd->summary,
|
||
cmd->description);
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
if (argc == 0)
|
||
grub_command_iterate (print_command_info);
|
||
else
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < argc; i++)
|
||
{
|
||
currarg = args[i];
|
||
grub_command_iterate (print_command_help);
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_extcmd_t cmd;
|
||
|
||
GRUB_MOD_INIT(help)
|
||
{
|
||
cmd = grub_register_extcmd ("help", grub_cmd_help,
|
||
GRUB_COMMAND_FLAG_CMDLINE,
|
||
"help [PATTERN ...]",
|
||
"Show a help message.", 0);
|
||
}
|
||
|
||
GRUB_MOD_FINI(help)
|
||
{
|
||
grub_unregister_extcmd (cmd);
|
||
}
|