feat: Scaffold up command line application

Now to make it actually do things.

Author: jezhiggins

lib/actions/index.js

@@ -0,0 +1,3 @@
+module.exports = {
+  init: require('./init')
+}

lib/actions/init/index.js

@@ -0,0 +1,5 @@
+function initAction (blueprintName, options) {
+  console.log("Yes lads")
+}
+
+module.exports = initAction

lib/index.js

@@ -1,10 +1,35 @@
 const program = require('commander')
+const chalk = require('chalk')
+const actions = require('./actions')
+
+require('../lib/util/enhanceErrorMessages')
 
 function tymlyCli (argv) {
   program
     .version(require('../package').version)
     .usage('<command> [options]')
 
+  program
+    .command('init [blueprint-name]')
+    .description('create a new Tymly blueprint')
+    .action((cmd, options) => {
+      actions.init(cmd, options)
+    })
+
+  program
+    .arguments('<command>')
+    .action((cmd) => {
+      program.outputHelp()
+      console.log(`${chalk.red('Unknown command')} ${chalk.yellow(cmd)}.`)
+      console.log()
+    })
+
+  program.on('--help', () => {
+    console.log()
+    console.log(`Run ${chalk.cyan(`tymly <command> --help`)} for detailed usage of given command.`)
+    console.log()
+  })
+
   program.parse(argv)
 
   if (!argv.slice(2).length) {

lib/util/enhanceErrorMessages.js

@@ -0,0 +1,29 @@
+const program = require('commander')
+const chalk = require('chalk')
+
+function enhanceErrorMessages (methodName, log) {
+  program.Command.prototype[methodName] = function (...args) {
+    if (methodName === 'unknownOption' && this._allowUnknownOption) {
+      return
+    }
+    this.outputHelp()
+    console.log(chalk.red(log(...args)))
+    console.log()
+  }
+}
+
+enhanceErrorMessages('missingArgument', argName => {
+  return `\nMissing required argument ${chalk.yellow(`<${argName}>`)}.`
+})
+
+enhanceErrorMessages('unknownOption', optionName => {
+  return `\nUnknown option ${chalk.yellow(optionName)}.`
+})
+
+enhanceErrorMessages('optionMissingArgument', (option, flag) => {
+  return `Missing required argument for option ${chalk.yellow(option.flags)}` + (
+    flag ? `, got ${chalk.yellow(flag)}` : ``
+  )
+})
+
+module.exports = enhanceErrorMessages