Make Guard coffeescript compilation include line numbers when the build fails

Change-Id: If06afc8db7d13c9ecd7737e452dfef7eba32e4e2
Reviewed-on: https://gerrit.instructure.com/45581
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Product-Review: Jon Jensen <jon@instructure.com>
QA-Review: Jon Jensen <jon@instructure.com>

Gemfile.d/development_and_test.rb

@@ -1,5 +1,5 @@
 group :development, :test do
-  gem 'coffee-script', '2.2.0'
+  gem 'coffee-script', '2.3.0'
   gem 'coffee-script-source', '1.6.2' #pinned so everyone's compiled output matches
   gem 'execjs', '1.4.0'
   gem 'hashdiff', '0.2.0'

lib/canvas/coffee_script.rb

@@ -3,6 +3,9 @@ module Canvas
 class CoffeeScript
   def self.coffee_script_binary_is_available?
     return @is_available if instance_variable_defined?(:@is_available)
+    # patch up the path to make sure we get node_modules bin, which should ensure the proper
+    # pinned coffee-script
+    ENV['PATH'] = 'node_modules/.bin:' + ENV['PATH']
     coffee_is_installed = `which coffee` && $?.success?
     if coffee_is_installed
       coffee_version = `coffee -v`.strip
@@ -15,4 +18,4 @@ class CoffeeScript
   end
 end
 
-end
+end

package.json

@@ -11,6 +11,7 @@
     "lodash": "^2.4.1",
     "mkdirp": "^0.5.0",
     "node-sass": "0.9.3",
+    "coffee-script": "1.6.2",
     "react-tools": "0.11.2"
   },
   "devDependencies": {