Add some CLI options

bin/marky-markdown.js

@@ -2,15 +2,47 @@
 var fs = require('fs')
 var path = require('path')
 var marky = require('..')
+var information = require('../marky.json')
 
-if (process.argv.length < 3) {
-  console.log('Usage:\n\nmarky-markdown some.md > some.html')
+var executable = process.argv[0]
+var script = process.argv[1]
+var parameters = process.argv.slice(2)
+
+function printHelp () {
+  console.log('Usage: marky-markdown [filename]')
+  console.log('')
+  console.log('Options: ')
+  console.log(' -h, --help    show this help message')
+  console.log(' -v, --version print the marky-markdown version')
+  console.log('')
+  console.log('Example:  `marky-markdown readme.md`')
+}
+
+function help () {
+  if (parameters[0] === '-h' || parameters[0] === '--help') {
+    printHelp()
+    process.exit()
+  }
+}
+
+function version () {
+  if (parameters[0] === '-V' || parameters[0] === '--version') {
+    console.log(information.version)
+    process.exit()
+  }
+}
+
+if (parameters.length === 0) {
+  printHelp()
   process.exit()
 }
 
-var filePath = path.resolve(process.cwd(), process.argv[2])
+help()
+version()
+
+var filename = path.resolve(process.cwd(), argv[0])
 
-fs.readFile(filePath, function (err, data) {
+fs.readFile(filename, function (err, data) {
   if (err) throw err
   var html = marky(data.toString())
   process.stdout.write(html)