Added error reporting.

guard-sprockets.gemspec

@@ -1,9 +1,10 @@
 # -*- encoding: utf-8 -*-
 $:.push File.expand_path("../lib", __FILE__)
+require 'guard/sprockets/version'
 
 Gem::Specification.new do |s|
   s.name        = "guard-sprockets"
-  s.version     = '0.2.0'
+  s.version     = Guard::SprocketsVersion::VERSION
   s.platform    = Gem::Platform::RUBY
   s.authors     = ["Aaron Cruz", 'Kematzy']
   s.email       = ["aaron@aaroncruz.com", "kematzy at gmail"]
@@ -12,10 +13,10 @@ Gem::Specification.new do |s|
   s.description = %q{guard file for sprockets}
 
   s.rubyforge_project = "guard-sprockets"
-  
+
   s.add_dependency 'guard', '>= 0.2.2'
   s.add_dependency "sprockets", '~> 2'
-  
+
   s.files        = Dir.glob('{lib}/**/*') #+ %w[LICENSE README.rdoc]
   s.require_path = 'lib'
 end

lib/guard/sprockets.rb

@@ -1,69 +1,79 @@
 require 'guard'
 require 'guard/guard'
-require 'erb'
 
 require 'sprockets'
+require 'execjs'
 
 module Guard
   class Sprockets < Guard
     def initialize(watchers=[], options={})
-      super 
-
-      # init Sprocket env for use later
-      @sprockets_env = ::Sprockets::Environment.new
-
+      super
+
+      @sprockets = ::Sprockets::Environment.new
+
       @asset_paths = options.delete(:asset_paths) || []
-      # add the asset_paths to the Sprockets env
       @asset_paths.each do |p|
-        @sprockets_env.append_path p
+        @sprockets.append_path p
       end
-      # store the output destination
+
       @destination = options.delete(:destination)
-      # the only file that should be built
-      @root_file = options.delete(:root_file)
+      @root_file   = options.delete(:root_file)
+
       @opts = options
     end
 
     def start
-       UI.info "Sprockets activated..."
-       UI.info " -- external asset paths = [#{@asset_paths.inspect}]" unless @asset_paths.empty?
-       UI.info " -- destination path = [#{@destination.inspect}]"
-       UI.info "Sprockets is ready and waiting for some file changes..."
+       UI.info "Sprockets activated."
+       UI.info "  - external asset paths = #{@asset_paths.inspect}" unless @asset_paths.empty?
+       UI.info "  - destination path = #{@destination.inspect}"
+       UI.info "Sprockets guard is ready and waiting for some file changes..."
+
+       run_all
     end
-    
+
     def run_all
-      run_on_change([@root_file]) if @root_file
+      run_on_change([ @root_file ]) if @root_file
+
       true
     end
 
     def run_on_change(paths)
       if @root_file
         sprocketize(@root_file)
       else
-        paths.each{ |js| sprocketize(js) }
+        paths.each do |file|
+          sprocketize(file)
+        end
       end
+
       true
     end
-    
+
     private
-    
+
     def sprocketize(path)
       changed = Pathname.new(path)
 
-      @sprockets_env.append_path changed.dirname
+      @sprockets.append_path changed.dirname
 
       output_basename = changed.basename.to_s
-      if match = output_basename.match(/^(.*\.(?:js|css))\.[^.]+$/)
-        output_basename = match[1]
-      end
+      output_basename.gsub!(/^(.*\.(?:js|css))\.[^.]+$/, '\1')
 
       output_file = Pathname.new(File.join(@destination, output_basename))
-      UI.info "Sprockets started compiling #{output_file}"
+
+      UI.info "Sprockets: compiling #{output_file}"
+
       FileUtils.mkdir_p(output_file.parent) unless output_file.parent.exist?
       output_file.open('w') do |f|
-        f.write @sprockets_env[output_basename]
+        f.write @sprockets[output_basename]
       end
+
       UI.info "Sprockets finished compiling #{output_file}"
+      Notifier.notify "Compiled #{output_basename}"
+    rescue ExecJS::ProgramError => e
+      UI.error "Sprockets failed to compile #{output_file}"
+      UI.error e.message
+      Notifier.notify "Syntax error in #{output_basename}: #{e.message}", :priority => 2, :image => :failed
     end
   end
 end

lib/guard/sprockets/version.rb

@@ -0,0 +1,5 @@
+module Guard
+  module SprocketsVersion
+    VERSION = "0.2.0"
+  end
+end