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/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * Redistributions of source code must retain the above copyright notice, this

 * list of conditions and the following disclaimer.

 *

 * Redistributions in binary form must reproduce the above copyright notice,

 * this list of conditions and the following disclaimer in the documentation

 * and/or other materials provided with the distribution.

 *

 * Neither the name of the original program's authors nor the names of its

 * contributors may be used to endorse or promote products derived from this

 * software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "config.h"

#include "entry.h"

#include "help.h"

#include "cmds.h"

#include "modules.h"

#include "builtins.h"

#include "errors.h"

#include "util.h"

static char *cmdname = "help";

extern const char *progname;

#define HELP_IS_MODULE   1

#define HELP_IS_BUILTIN  0

#define HELP_IS_RUBBISH  -1

volatile int mod_switch = -1;

/* Just use a pointer here, no need for mod_switch */

static int is_mod_or_builtin(char *cmd)

{

    int rc = HELP_IS_RUBBISH;

    rc = is_builtin(cmd);

    if (rc > -1) {

        mod_switch = rc;

        return HELP_IS_BUILTIN;

    }

    rc = is_module(cmd);

    if (rc > -1) {

        mod_switch = rc;

        return HELP_IS_MODULE;

    }

    return HELP_IS_RUBBISH;

}

void help_cmd_help(unsigned int level)

{

    if (level == HELP_SHORT) {

        printf(

        "\n  %s [command] <extended>\n"

        "  Use help [command] extended for detailed help on [command] "

        ", even `help'\n\n", cmdname);

    } else {

        printf(

        "\n  `%s' - shows help for commands\n"

        "  Examples:\n"

        "   %s [command]           Show help for [command]\n"

        "   %s [command] extended  Show extended help for [command]\n"

        "\n  If no argument is given to %s, a list of commands are shown\n\n",

        cmdname, cmdname, cmdname, cmdname);

    }

    return;

}

int cmd_help(char *argv[])

{

    module_t *mod;

    builtin_t *cmd;

    unsigned int i = 0;

    int rc = 0;

    int argc;

    int level = HELP_SHORT;

    argc = cli_count_args(argv);

    if (argc > 3) {

        printf("\nToo many arguments to `%s', try:\n", cmdname);

        help_cmd_help(HELP_SHORT);

        return CMD_FAILURE;

    }

    if (argc == 3) {

        if (!strcmp("extended", argv[2]))

            level = HELP_LONG;

        else

            level = HELP_SHORT;

    }

    if (argc > 1) {

        rc = is_mod_or_builtin(argv[1]);

        switch (rc) {

        case HELP_IS_RUBBISH:

            printf("Invalid command %s\n", argv[1]);

            return CMD_FAILURE;

        case HELP_IS_MODULE:

            help_module(mod_switch, level);

            return CMD_SUCCESS;

        case HELP_IS_BUILTIN:

            help_builtin(mod_switch, level);

            return CMD_SUCCESS;

        }

    }

    printf("\n  Available commands are:\n");

    printf("  ------------------------------------------------------------\n");

    /* First, show a list of built in commands that are available in this mode */

    for (cmd = builtins; cmd->name != NULL; cmd++, i++) {

        if (!builtin_is_restricted(i)) {

            if (is_builtin_alias(cmd->name))

                printf("   %-16s\tAlias for `%s'\n", cmd->name,

                    alias_for_builtin(cmd->name));

            else

                printf("   %-16s\t%s\n", cmd->name, cmd->desc);

        }

    }

    i = 0;

    /* Now, show a list of module commands that are available in this mode */

    for (mod = modules; mod->name != NULL; mod++, i++) {

        if (!module_is_restricted(i)) {

            if (is_module_alias(mod->name))

                printf("   %-16s\tAlias for `%s'\n", mod->name,

                    alias_for_module(mod->name));

            else

                printf("   %-16s\t%s\n", mod->name, mod->desc);

        }

    }

    printf("\n  Try %s %s for more information on how `%s' works.\n\n",

        cmdname, cmdname, cmdname);

    return CMD_SUCCESS;

}