support command-line option (#27)

src/kot.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018,2019 Rinwasyu
+ * Copyright 2018,2019,2020 Rinwasyu
  * 
  * This file is part of kot.
  * 
@@ -27,6 +27,7 @@
 #include "editor.h"
 #include "key.h"
 #include "kot.h"
+#include "option.h"
 
 void setup() {
 	key.init();
@@ -53,6 +54,7 @@ int update() {
 }
 
 int main(int argc, char **argv) {
+	option.readOptions(&option, argc, argv);
 	setup();
 	if (argc == 1) {
 		doc.new(&doc, "file.txt");

src/kot.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019 Rinwasyu
+ * Copyright 2019,2020 Rinwasyu
  * 
  * This file is part of kot.
  * 
@@ -22,7 +22,12 @@
 
 #define KOT_KOT_H
 
+#define PROGNAME "kot"
 #define VERSION "v0.6.5"
+#define AUTHOR "Rinwasyu"
+#define AUTHOR_YEAR "2018"
+#define WEBSITE "https://github.com/Rinwasyu/kot"
+#define LICENSE "GPL v3"
 #define DRAW_TITLEBAR_HEIGHT 1
 #define DOC_MAXIMUM_ROWS 2000
 #define DOC_MAXIMUM_COLS 1000

src/option.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2020 Rinwasyu
+ * 
+ * This file is part of kot.
+ * 
+ * Kot 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.
+ * 
+ * Kot 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/>.
+ * 
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "kot.h"
+#include "option.h"
+
+void option_help() {
+	printf("Usage: %s [--help] [--version]\n", PROGNAME);
+	exit(0);
+}
+
+void option_version() {
+	printf("%s %s\n", PROGNAME, VERSION);
+	printf("Copyright %s %s\n", AUTHOR_YEAR, AUTHOR);
+	printf("%s\n", WEBSITE);
+	printf("This program is licensed under %s\n", LICENSE);
+	exit(0);
+}
+
+void option_readOptions(struct Option *option, int argc, char **argv) {
+	int unknown_options = 0;
+	for (int i = 1; i < argc; i++) {
+		if (argv[i][0] == '-') {
+			int j = 1;
+			for (; argv[i][j] == '-'; j++);
+
+			if (strcmp(&argv[i][j], "help") == 0) {
+				option->help();
+			} else if (strcmp(&argv[i][j], "version") == 0) {
+				option->version();
+			} else {
+				printf("Unknown option: %s\n", argv[i]);
+				unknown_options++;
+			}
+		}
+	}
+	if (unknown_options > 0) {
+		option->help();
+	}
+}
+
+struct Option option = {
+	option_readOptions,
+	option_help,
+	option_version
+};

src/option.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2020 Rinwasyu
+ * 
+ * This file is part of kot.
+ * 
+ * Kot 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.
+ * 
+ * Kot 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/>.
+ * 
+ */
+
+#ifndef KOT_OPTION_H
+
+#define KOT_OPTION_H
+
+struct Option {
+	void (*readOptions)(struct Option *option, int argc, char **argv);
+	void (*help)(void);
+	void (*version)(void);
+};
+
+void option_help(void);
+void option_version(void);
+void option_readOptions(struct Option *option, int argc, char **argv);
+
+struct Option option;
+
+#endif