Add j2m cli

There is a new cli in src/bin/j2m.js that can convert a file or stdin

package.json

@@ -6,6 +6,9 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
+  "bin": {
+    "j2m": "src/bin/j2m.js"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/FokkeZB/J2M.git"
@@ -21,5 +24,9 @@
   "bugs": {
     "url": "https://github.com/FokkeZB/J2M/issues"
   },
-  "homepage": "https://github.com/FokkeZB/J2M#readme"
+  "homepage": "https://github.com/FokkeZB/J2M#readme",
+  "dependencies": {
+    "colors": "^1.1.2",
+    "minimist": "^1.2.0"
+  }
 }

src/bin/j2m.js

@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+
+var J2M = require('../J2M');
+var settings = require('./settings');
+
+var readline = require('readline');
+var fs = require('fs');
+
+var colors = require('colors');
+
+/**
+ * All content will be written into this string. This string will then be converted.
+ * This cannot be done line-by-line because there are muliline contexts in both formats, that
+ * would be discarded
+ *
+ * @type {string}
+ */
+var input = '';
+
+/**
+ * Does the final conversion of all data in the "input" variable and outputs it correctly
+ */
+function convert() {
+	if (settings.toJ) {
+		console.log(J2M.toJ(input));
+	} else if (settings.toM) {
+		console.log(J2M.toM(input));
+	} else {
+		console.error("Something went horribly wrong. This should never happen".red);
+		process.exit(500);
+	}
+}
+
+
+if (settings.stdin) {
+	var rl = readline.createInterface({
+		input: process.stdin,
+		terminal: false
+	});
+	rl.on('line', function(line){
+		input += line;
+	});
+
+	rl.on('close', function() {
+		convert();
+		process.exit(0);
+	});
+} else {
+	input = fs.readFileSync(settings.filename, 'utf8');
+	convert();
+}

src/bin/settings.js

@@ -0,0 +1,45 @@
+var argv = require('minimist')(process.argv.slice(2), {
+	boolean: ['toM', 'toJ', 'm', 'j', 'stdin']
+});
+var colors = require('colors');
+
+var settings = {
+	toM:  !!(argv.m || argv.toM),
+	toJ: !!(argv.j || argv.toJ),
+	stdin: !!argv.stdin,
+	filename: argv._[argv._.length - 1]
+};
+
+
+var USAGE = "J2M: Convert from JIRA text formatting to GitHub Flavored MarkDown and back again \n" +
+	"\n" +
+	"$ j2m [--toM|--toJ] [--stdin] $filename \n" +
+	"\n" +
+	"Options: \n" +
+	"--toM, -m:    Treat input as jira text and convert it to Markdown \n" +
+	"--toJ, -j:    Treat input as markdown text and convert it to Jira \n" +
+	"--stdin:      Read input from stdin. In this case the give filename is ignored \n";
+
+function exit(message, code) {
+	console.error('\n' + message.red +  '\n');
+	console.log(USAGE);
+	process.exit(code);
+}
+
+
+if (!settings.stdin && !settings.filename) {
+	// TODO: neither stdin nor file?
+	exit('No file was specified. Did you mean to use --stdin ?');
+}
+
+
+if (!settings.toM && !settings.toJ) {
+	// TODO: Try to detect it automatically
+	if (settings.filename && settings.filename.indexOf('.md') > -1) {
+		settings.toJ = true;
+	} else {
+		exit('Neither --toM nor --toJ was specified', 2);
+	}
+}
+
+module.exports = settings;