/* ************************************************************************** */
/*                                       _____           _                    */
/*  args.c                              |_   _|__  _   _| |__   ___ _   _     */
/*  | Project: mcsfile                    | |/ _ \| | | | '_ \ / _ \ | | |    */
/*                                        | | (_) | |_| | | | |  __/ |_| |    */
/*  By: thomas <thomas@touhey.fr>         |_|\___/ \__,_|_| |_|\___|\__, |.fr */
/*  Last updated: 2016/12/18 01:20:51                               |___/     */
/*                                                                            */
/* ************************************************************************** */
#include "main.h"
#include <getopt.h>
#define Q(x) #x
#define QUOTE(x) Q(x)

/* ************************************************************************** */
/*  Help and version messages                                                 */
/* ************************************************************************** */
/* Help message */
static const char *help_message =
"Usage: mcsfile [--version|-v] [--help|-h]\n"
"               <g1m file>\n"
"\n"
"Reads mcs files in a g1m file.\n"
"\n"
"Options are:\n"
"  -h, --help        Display this help message.\n"
"  -v, --version     Display the version message.\n"
"\n"
"Report bugs to " QUOTE(AUTHOR) ".";

/* Version message */
static const char *version_message =
"mcsfile - from g1mutils v" QUOTE(VERSION)
	" (licensed under " QUOTE(LICENSE) ")\n"
"Made by " QUOTE(AUTHOR) ".\n"
"\n"
"This is free software; see the source for copying conditions.\n"
"There is NO warranty; not even for MERCHANTABILITY or\n"
"FITNESS FOR A PARTICULAR PURPOSE.";

/* ************************************************************************** */
/*  Main function                                                             */
/* ************************************************************************** */
/**
 *	parse_args:
 *	Args parsing main function.
 *
 *	@arg	ac		the arguments count.
 *	@arg	av		the arguments values.
 *	@arg	files	pointer to the file paths tab to allocate.
 *	@return			if execution should stop.
 */

int parse_args(int ac, char **av, const char **path)
{
	/* getopt elements */
	const char *optstring = "hv";
	const struct option longopts[] = {
		{"help", no_argument, NULL, 'h'},
		{"version", no_argument, NULL, 'v'},
		{}
	};

	/* get options */
	int c; opterr = 0;
	int help = 0, version = 0;
	while ((c = getopt_long(ac, av, optstring, longopts, NULL)) != -1)
	  switch (c) {
		case 'h': help = 1; break;
		case 'v': version = 1; break;
		default: switch (optopt) {
			default:
				fprintf(stderr, "-%c: unknown option.\n", optopt);
		}
		return (1);
	}

	/* check parameters */
	int pc = ac - optind;
	char **pv = &av[optind];
	if (pc != 1) help = 1;
	else *path = *pv;

	/* display version or help message */
	if (version) {
		puts(version_message);
		return (1);
	} else if (help) {
		puts(help_message);
		return (1);
	}

	/* no error */
	return (0);
}