Add CLI support

Author: lukehorvat

package.json

@@ -2,6 +2,7 @@
   "name": "bash-parser",
   "version": "0.5.0",
   "main": "src/index.js",
+  "bin": "src/cli.js",
   "description": "Standard compliant bash parser",
   "repository": "vorpaljs/bash-parser",
   "license": "MIT",

src/cli.js

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const parse = require('../');
+const pkg = require('../package');
+
+const args = process.argv.slice(2);
+
+if (!args.length || args.includes('--help') || args.includes('-h')) {
+	console.log(`${pkg.name} – ${pkg.description}\n\nUsage:\n\n\t${pkg.name} <source>`);
+	process.exit();
+}
+
+if (args.includes('--version') || args.includes('-v')) {
+	console.log(pkg.version);
+	process.exit();
+}
+
+const [sourceCode] = args;
+const ast = parse(sourceCode);
+console.log(JSON.stringify(ast, null, '\t'));