107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/* help.c - command to show a help text. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2005,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/normal.h>
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#include <grub/dl.h>
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#include <grub/arg.h>
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#include <grub/misc.h>
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/* XXX: This has to be changed into a function so the screen can be
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optimally used. */
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#define TERM_WIDTH 80
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static grub_err_t
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grub_cmd_help (struct grub_arg_list *state __attribute__ ((unused)), int argc,
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char **args)
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{
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int cnt = 0;
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char *currarg;
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auto int print_command_info (grub_command_t cmd);
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auto int print_command_help (grub_command_t cmd);
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int print_command_info (grub_command_t cmd)
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{
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if (grub_command_find (cmd->name))
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{
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if (cmd->flags & GRUB_COMMAND_FLAG_CMDLINE)
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{
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char description[TERM_WIDTH / 2];
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int desclen = grub_strlen (cmd->summary);
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/* Make a string with a length of TERM_WIDTH / 2 - 1 filled
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with the description followed by spaces. */
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grub_memset (description, ' ', TERM_WIDTH / 2 - 1);
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description[TERM_WIDTH / 2 - 1] = '\0';
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grub_memcpy (description, cmd->summary,
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(desclen < TERM_WIDTH / 2 - 1
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? desclen : TERM_WIDTH / 2 - 1));
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grub_printf ("%s%s", description, (cnt++) % 2 ? "\n" : " ");
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}
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}
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return 0;
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}
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int print_command_help (grub_command_t cmd)
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{
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if (grub_command_find (cmd->name))
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{
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if (! grub_strncmp (cmd->name, currarg, grub_strlen (currarg)))
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{
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if (cnt++ > 0)
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grub_printf ("\n\n");
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grub_arg_show_help (cmd);
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}
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}
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return 0;
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}
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if (argc == 0)
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grub_iterate_commands (print_command_info);
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else
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{
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int i;
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for (i = 0; i < argc; i++)
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{
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currarg = args[i];
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grub_iterate_commands (print_command_help);
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}
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}
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return 0;
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}
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GRUB_MOD_INIT(help)
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{
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(void)mod; /* To stop warning. */
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grub_register_command ("help", grub_cmd_help, GRUB_COMMAND_FLAG_CMDLINE,
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"help [PATTERN ...]", "Show a help message.", 0);
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}
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GRUB_MOD_FINI(help)
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{
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grub_unregister_command ("help");
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}
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