added option to either load Rails or use rake command

lib/guard/rails-assets.rb

@@ -9,15 +9,15 @@ module Guard
       @options = options || {}
       @run_on = @options[:run_on] || [:start, :change]
       @run_on = [@run_on] unless @run_on.respond_to?(:include?)
-      @rails_runner = RailsRunner.new
     end
 
     def start
+      runner.start if runner.respond_to? :start
       compile_assets if run_for? :start
     end
 
     def reload
-      @rails_runner.restart_rails
+      runner.reload if runner.respond_to? :reload
 
       compile_assets if run_for? :reload
     end
@@ -32,7 +32,7 @@ module Guard
 
     def compile_assets
       puts 'Compiling rails assets'
-      result = @rails_runner.compile_assets
+      result = runner.compile_assets
 
       if result
         Notifier::notify 'Assets compiled'
@@ -41,10 +41,18 @@ module Guard
       end
     end
 
+    def runner
+      @runner ||= begin
+        runner_name = (@options[:runner] || :rails).to_s
+
+        require_relative "rails-assets/#{runner_name}_runner"
+        ::Guard::RailsAssets.const_get(runner_name.capitalize + 'Runner').new(@options)
+      end
+    end
+
     def run_for? command
       @run_on.include?(command)
     end
   end
 end
 
-require 'guard/rails-assets/rails_runner'

lib/guard/rails-assets/cli_runner.rb

@@ -0,0 +1,10 @@
+module Guard
+  class RailsAssets::CliRunner
+    def initialize(options)
+    end
+
+    def compile_assets
+      system "bundle exec rake assets:clean assets:precompile"
+    end
+  end
+end

lib/guard/rails-assets/rails_runner.rb

@@ -2,8 +2,8 @@ module Guard
 
   class RailsAssets::RailsRunner
 
-    def initialize
+    def initialize(options)
-      boot_rails
+      
     end
 
     # Methods to run the asset pipeline
@@ -29,7 +29,10 @@ module Guard
     end
 
     def boot_rails
+      @rails_booted ||= begin
         require "#{Dir.pwd}/config/environment.rb"
+        true
+      end
     end
 
     def run_compiler
@@ -47,6 +50,7 @@ module Guard
     #
     # @return [ Boolean ] Whether the compilation was successful or not
     def compile_assets
+      boot_rails
       run_compiler
       
       !failed?

spec/guard/rails-assets/cli_runner_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+
+describe Guard::RailsAssets::CliRunner do
+
+  subject { Guard::RailsAssets::CliRunner.new({}) }
+
+  it 'should run the command' do
+    subject.stub(:system)
+    subject.should_receive(:system).with("bundle exec rake assets:clean assets:precompile")
+    subject.compile_assets
+  end
+end

spec/guard/rails-assets/rails_runner_spec.rb

@@ -2,6 +2,8 @@ require 'spec_helper'
 
 describe Guard::RailsAssets::RailsRunner do
 
+  subject { Guard::RailsAssets::RailsRunner.new({}) }
+  
   describe ".compile_assets" do
     
     let(:asset_pipeline) { Guard::RailsAssets::RailsRunner::AssetPipeline }
@@ -19,7 +21,7 @@ describe Guard::RailsAssets::RailsRunner do
         asset_pipeline.stub(:precompile)
       end
       
-      it "clean's the assets" do
+      it "cleans the assets" do
         asset_pipeline.should_receive(:clean)
         subject.compile_assets
       end

spec/guard/rails-assets_spec.rb

@@ -2,13 +2,16 @@ require 'spec_helper'
 require 'guard/rails-assets'
 
 describe Guard::RailsAssets do
-  let(:options) { {} }
+
-  let(:rails_runner) { mock(Guard::RailsAssets::RailsRunner) }
+
+  context 'with any runner' do
+
+    let(:options) { {:runner => :cli} }
+    let(:runner) { mock('runner') }
     subject { Guard::RailsAssets.new(['watchers'], options) }
 
     before do
-    Guard::RailsAssets::RailsRunner.stub(:new => rails_runner)
+     Guard::RailsAssets::CliRunner.stub(:new).and_return runner
-    rails_runner.stub(:compile_assets => true, :restart_rails => true)
     end
 
     describe '#start' do
@@ -39,11 +42,12 @@ describe Guard::RailsAssets do
         guard.run_for?(:start).should be_true
         guard.run_for?(:reload).should be_false
       end
+
     end
 
-  describe 'asset compilation using CLI' do
+    describe 'notifications' do
       def stub_system_with result
-      rails_runner.should_receive(:compile_assets).and_return result
+        runner.should_receive(:compile_assets).and_return result
       end
 
       it 'should notify on success' do
@@ -54,9 +58,24 @@ describe Guard::RailsAssets do
 
       it 'should notify on failure' do
         stub_system_with false
-      subject.should_not_receive(:`) # don't obtain tree
         Guard::Notifier.should_receive(:notify).with('see the details in the terminal', :title => "Can't compile assets", :image => :failed)
         subject.compile_assets
       end
     end
+
+  end # context with any runner
+
+  describe 'picking a runner' do
+    it 'should use Rails runner by default' do
+      Guard::RailsAssets.new(['watchers']).runner.class.should == ::Guard::RailsAssets::RailsRunner
+    end
+
+    it 'should use CLI runner' do
+      Guard::RailsAssets.new(['watchers'], :runner => :cli).runner.class.should == ::Guard::RailsAssets::CliRunner
+    end
+    
+    it 'should use RailsRunner' do
+      Guard::RailsAssets.new(['watchers'], :runner => :rails).runner.class.should == ::Guard::RailsAssets::RailsRunner
+    end
+  end
 end

spec/spec_helper.rb

@@ -2,6 +2,8 @@ require 'rspec'
 require 'guard/rails-assets'
 require 'support/shared_examples'
 require 'support/stdout_helper'
+require 'guard/rails-assets/cli_runner'
+require 'guard/rails-assets/rails_runner'
 
 RSpec.configure do |config|
   config.color_enabled = true