feat(CLI): add a simple cli tool

.gitignore

@@ -3,4 +3,4 @@
 .DS_Store
 node_modules
 npm-debug.log
-localtest.html
+/*.test.*

.jshintignore

@@ -1,3 +1,5 @@
 Gruntfile.js
 dist/**/*.js
 build/**/*.js
+src/options.js
+bin/*

Gruntfile.js

@@ -20,6 +20,7 @@ module.exports = function (grunt) {
       },
       dist: {
         src: [
+          'src/options.js',
           'src/showdown.js',
           'src/helpers.js',
           'src/converter.js',

bin/showdown.js

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+require('../src/cli/cli');

package.json

@@ -36,7 +36,7 @@
     "test": "grunt test"
   },
   "bin": {
-    "showdown": "src/cli.js"
+    "showdown": "bin/showdown.js"
   },
   "devDependencies": {
     "chai": "^1.10.0",
@@ -53,5 +53,8 @@
     "quiet-grunt": "^0.2.3",
     "sinon": "^1.14.1",
     "source-map-support": "^0.2.9"
+  },
+  "dependencies": {
+    "yargs": "^3.15.0"
   }
 }

src/cli/cli.js

@@ -0,0 +1,30 @@
+'use strict';
+
+var version = require('../../package.json').version,
+    yargs = require('yargs');
+
+yargs
+  .version(version, 'v')
+  .alias('v', 'version')
+  .option('h', {
+    alias: 'help',
+    description: 'Show help'
+  })
+  .usage('Usage: showdown <command> [options]')
+  .demand(1, 'You must provide a valid command')
+  .command('makehtml', 'Converts markdown into html')
+  .example('showdown makehtml -i foo.md -o bar.html', 'Converts \'foo.md\' to \'bar.html\'')
+  .wrap(yargs.terminalWidth());
+
+var argv = yargs.argv,
+  command = argv._[0];
+if (command === 'makehtml') {
+  require('./makehtml.cmd.js').run();
+} else {
+  yargs.showHelp();
+}
+
+if (argv.help) {
+  yargs.showHelp();
+}
+process.exit(0);

src/cli/errorexit.js

@@ -0,0 +1,6 @@
+module.exports = exports = function errorExit(e) {
+  'use strict';
+  console.error('ERROR: ' + e.message);
+  console.error('Run \'showdown <command> -h\' for help');
+  process.exit(1);
+};