Notify the user if there is an available update

For this we use the `update-notifier` module with its default settings.

This module will print a nice banner prompting the user to run the
corresponding npm command to update.

build/app.js

@@ -1,5 +1,5 @@
 (function() {
-  var _, actions, async, capitano, errors, plugins, resin;
+  var _, actions, async, capitano, errors, plugins, resin, update;
 
   _ = require('lodash');
 
@@ -15,6 +15,8 @@
 
   plugins = require('./plugins');
 
+  update = require('./utils/update');
+
   capitano.permission('user', function(done) {
     return resin.auth.isLoggedIn().then(function(isLoggedIn) {
       if (!isLoggedIn) {
@@ -100,6 +102,8 @@
 
   capitano.command(actions.plugin.remove);
 
+  update.notify();
+
   async.waterfall([
     function(callback) {
       return plugins.register('resin-plugin-', callback);

build/utils/update.js

@@ -0,0 +1,23 @@
+(function() {
+  var notifier, packageJSON, updateNotifier;
+
+  updateNotifier = require('update-notifier');
+
+  packageJSON = require('../../package.json');
+
+  notifier = updateNotifier({
+    pkg: packageJSON
+  });
+
+  exports.hasAvailableUpdate = function() {
+    return notifier != null;
+  };
+
+  exports.notify = function() {
+    if (!exports.hasAvailableUpdate()) {
+      return;
+    }
+    return notifier.notify();
+  };
+
+}).call(this);

lib/app.coffee

@@ -5,6 +5,7 @@ resin = require('resin-sdk')
 actions = require('./actions')
 errors = require('./errors')
 plugins = require('./plugins')
+update = require('./utils/update')
 
 capitano.permission 'user', (done) ->
 	resin.auth.isLoggedIn().then (isLoggedIn) ->
@@ -73,6 +74,8 @@ capitano.command(actions.plugin.install)
 capitano.command(actions.plugin.update)
 capitano.command(actions.plugin.remove)
 
+update.notify()
+
 async.waterfall([
 
 	(callback) ->

lib/utils/update.coffee

@@ -0,0 +1,11 @@
+updateNotifier = require('update-notifier')
+packageJSON = require('../../package.json')
+
+notifier = updateNotifier(pkg: packageJSON)
+
+exports.hasAvailableUpdate = ->
+	return notifier?
+
+exports.notify = ->
+	return if not exports.hasAvailableUpdate()
+	notifier.notify()

package.json

@@ -62,6 +62,7 @@
     "resin-vcs": "^2.0.0",
     "selfupdate": "^1.1.0",
     "underscore.string": "^3.1.1",
+    "update-notifier": "^0.5.0",
     "valid-email": "0.0.2"
   }
 }