Make run() print help if no matches

lib/app.coffee

@@ -5,6 +5,8 @@ config = require('./config')
 yargs = require('yargs')
 yargs.command = require('./yargs-command/yargs-command')
 
+yargs.usage('$0 [options] <command>')
+
 # ---------- Auth Module ----------
 auth = require('./actions/auth')
 

lib/yargs-command/yargs-command.coffee

@@ -26,6 +26,8 @@ commandApplies = (command, args) ->
 	return true
 
 run = ->
+	if not @command._matchedCommand?
+		return console.log(@help())
 	signature = splitSignature(@command._matchedCommand.signature)
 	parameters = _.difference(@argv._, signature)
 	@command._matchedCommand.action.apply(this, parameters)

lib/yargs-command/yargs-command.spec.coffee

@@ -108,3 +108,8 @@ describe 'Yargs Command:', ->
 			yargs.command(COMMANDS.appList.signature, callback)
 			yargs.command.run()
 			expect(callback).to.have.been.calledWith(_.last(ARGS.appList._))
+
+		it 'should print help if no matches', ->
+			helpSpy = sinon.spy(yargs, 'help')
+			yargs.command.run()
+			expect(helpSpy).to.have.been.called