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/* 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>
GRUB_MOD_LICENSE ("GPLv3+");
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_COMMAND_FLAG_ACTIVE))
{
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_iter, cmd, cmd_next;
for (i = 0; i < argc; i++)
{
currarg = args[i];
FOR_COMMANDS_SAFE (cmd_iter, cmd_next)
{
if (!(cmd_iter->prio & GRUB_COMMAND_FLAG_ACTIVE))
continue;
if (grub_strncmp (cmd_iter->name, currarg,
grub_strlen (currarg)) != 0)
continue;
if (cmd_iter->flags & GRUB_COMMAND_FLAG_DYNCMD)
cmd = grub_dyncmd_get_cmd (cmd_iter);
else
cmd = cmd_iter;
if (!cmd)
{
grub_print_error ();
continue;
}
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, 0,
N_("[PATTERN ...]"),
N_("Show a help message."), 0);
}
GRUB_MOD_FINI(help)
{
grub_unregister_extcmd (cmd);
}
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