mirror of
https://git.proxmox.com/git/grub2
synced 2025-11-04 03:55:15 +00:00
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/* help.c - command to show a help text. */
|
||
/*
|
||
* GRUB -- GRand Unified Bootloader
|
||
* Copyright (C) 2005,2007,2008,2009 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>
|
||
#include <grub/i18n.h>
|
||
#include <grub/mm.h>
|
||
#include <grub/normal.h>
|
||
#include <grub/charset.h>
|
||
|
||
static grub_err_t
|
||
grub_cmd_help (grub_extcmd_context_t ctxt __attribute__ ((unused)), int argc,
|
||
char **args)
|
||
{
|
||
int cnt = 0;
|
||
char *currarg;
|
||
|
||
if (argc == 0)
|
||
{
|
||
grub_command_t cmd;
|
||
FOR_COMMANDS(cmd)
|
||
{
|
||
if ((cmd->prio & GRUB_PRIO_LIST_FLAG_ACTIVE) &&
|
||
(cmd->flags & GRUB_COMMAND_FLAG_CMDLINE))
|
||
{
|
||
struct grub_term_output *term;
|
||
const char *summary_translated = _(cmd->summary);
|
||
char *command_help;
|
||
grub_uint32_t *unicode_command_help;
|
||
grub_uint32_t *unicode_last_position;
|
||
|
||
command_help = grub_xasprintf ("%s %s", cmd->name, summary_translated);
|
||
if (!command_help)
|
||
break;
|
||
|
||
grub_utf8_to_ucs4_alloc (command_help, &unicode_command_help,
|
||
&unicode_last_position);
|
||
|
||
FOR_ACTIVE_TERM_OUTPUTS(term)
|
||
{
|
||
unsigned stringwidth;
|
||
grub_uint32_t *unicode_last_screen_position;
|
||
|
||
unicode_last_screen_position = unicode_command_help;
|
||
|
||
stringwidth = 0;
|
||
|
||
while (unicode_last_screen_position < unicode_last_position &&
|
||
stringwidth < ((grub_term_width (term) / 2) - 2))
|
||
{
|
||
struct grub_unicode_glyph glyph;
|
||
unicode_last_screen_position
|
||
+= grub_unicode_aglomerate_comb (unicode_last_screen_position,
|
||
unicode_last_position
|
||
- unicode_last_screen_position,
|
||
&glyph);
|
||
|
||
stringwidth
|
||
+= grub_term_getcharwidth (term, &glyph);
|
||
}
|
||
|
||
grub_print_ucs4 (unicode_command_help,
|
||
unicode_last_screen_position, 0, 0, term);
|
||
if (!(cnt % 2))
|
||
grub_print_spaces (term, grub_term_width (term) / 2
|
||
- stringwidth);
|
||
}
|
||
|
||
if (cnt % 2)
|
||
grub_printf ("\n");
|
||
cnt++;
|
||
|
||
grub_free (command_help);
|
||
grub_free (unicode_command_help);
|
||
}
|
||
}
|
||
if (!(cnt % 2))
|
||
grub_printf ("\n");
|
||
}
|
||
else
|
||
{
|
||
int i;
|
||
grub_command_t cmd;
|
||
|
||
for (i = 0; i < argc; i++)
|
||
{
|
||
currarg = args[i];
|
||
FOR_COMMANDS(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) &&
|
||
! (cmd->flags & GRUB_COMMAND_FLAG_DYNCMD))
|
||
grub_arg_show_help ((grub_extcmd_t) cmd->data);
|
||
else
|
||
grub_printf ("%s %s %s\n%s\n", _("Usage:"), cmd->name, _(cmd->summary),
|
||
_(cmd->description));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_extcmd_t cmd;
|
||
|
||
GRUB_MOD_INIT(help)
|
||
{
|
||
cmd = grub_register_extcmd ("help", grub_cmd_help,
|
||
GRUB_COMMAND_FLAG_CMDLINE,
|
||
N_("[PATTERN ...]"),
|
||
N_("Show a help message."), 0);
|
||
}
|
||
|
||
GRUB_MOD_FINI(help)
|
||
{
|
||
grub_unregister_extcmd (cmd);
|
||
}
|