/*
 *    AGROS - The new Limited Shell
 *
 *    Author: Joe "rahmu" Hakim Rahme <joe.hakim.rahme@gmail.com>
 *
 *
 *    This file is part of AGROS.
 *
 *    This program 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.
 *
 *    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#define MAX_LINE_LEN 256
#define MAX_ARGS (MAX_LINE_LEN/2)
#define WHITESPACE " \t\n"

#define OTHER_CMD   0
#define EMPTY_CMD   1
#define CD_CMD      2
#define HELP_CMD    3
#define EXIT_CMD    4


/*
 * This structure allows me to handle built-in commands with a switch statement
 * instead of multiple ifs. Since I cannot switch on a string, I associate a
 * command_code to each built-in command. The codes are define as preprocessor
 * instructions.
 */

typedef struct built_in_commands built_in_commands;
struct built_in_commands{
    char command_name[MAX_LINE_LEN];
    int command_code;
};

/* This structure holds user input. 3 fields:
 *   - argv: an array of strings. Each word of the input is a case of the array.
 *   - name: the name of the executable called. By default it's argv[0]
 *   - argc: the number of words given in input. It's equivalent to the length of argv.
 *
 * Note: Some filenames have a space character (" ") in their names. I will have
 * to deal with that properly ... someday.
 */

typedef struct command_t command_t;
struct command_t{
    char* name;
    int argc;
    char* argv[MAX_ARGS+1];
};


/*
 * These are the functions called by AGROS. These declarations are pretty explicit.
 * More detailed comments can be found in source files.
 *
 */

void parse_command(char *cmdline, command_t *cmd);
int read_input(char* string, int num);
char* return_prompt(void);
void print_help(void);
void change_directory(char* PATH);
char* concat_spaces(char** string_array);
int get_cmd_code(char* cmd_name);
char* ag_readline(char* prompt);