options.c

#include <getopt.h>
#include <inttypes.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "options.h"

void show_help();
void print_version();

struct tm_options parse_options(int argc, char **argv)
{
	static struct option options[] = {
		{ "width", required_argument, NULL, 'w' },
		{ "height", required_argument, NULL, 'h' },
		{ "mine-density",  required_argument, NULL, 'm' },
		{ "help", no_argument, NULL, 1 },
		{ "version", no_argument, NULL, 'v' },
		{ "adventure-mode", no_argument, NULL, 'a' },
		{ NULL, 0, NULL, 0 }
	};

	// Default options
	struct tm_options tm_options = {.width = 20,
									.height = 10,
									.mine_density = 0.1,
									.adventure_mode = false};

	signed char param;
	while ((param = getopt_long(argc, argv, "w:h:m:va", options, NULL)) != -1) {
		switch (param) {
		case 'w': {
			uintmax_t value = strtoumax(optarg, NULL, 10);
			if (value != UINTMAX_MAX) {
				tm_options.width = (int)value;
			}
			break;
		}

		case 'h': {
			uintmax_t value = strtoumax(optarg, NULL, 10);
			if (value != UINTMAX_MAX) {
				tm_options.height = (int)value;
			}
			break;
		}

		case 'm': {
			float value = strtof(optarg, NULL);
			if (value != 0) {
				tm_options.mine_density = value;
			}
			break;
		}

		case 'v': {
			print_version();
			exit(0);
		}

		case 'a': {
			tm_options.adventure_mode = true;
			break;
		}

		case 1: {
			show_help();
			exit(0);
		}
		}
	}
	
	return tm_options;
}

void show_help()
{
	// If manpage exists locally, prioritize it to allow local builds to show help
	char *manpage_path = NULL;
	if (access("man/terminal-mines.1", F_OK | R_OK) != -1 ) {
		manpage_path = "man/terminal-mines.1";
	} else {
		manpage_path = "terminal-mines";
	}

    pid_t pid = fork();
    if (pid == 0) { /* Child process */
        char *argv[] = {"man", manpage_path, NULL};
        execv("/usr/bin/man", argv);
        exit(127); /* only if execv fails */
    } else { /* pid != 0; parent process */
        waitpid(pid, 0, 0); /* wait for child to exit */
    }
}

void print_version()
{
	puts("1.2.0");
}