enable coffeescript cache, step 1 of a big speedup

.gitignore

@@ -11,3 +11,4 @@ moc_*.*
 .DS_Store
 hydra-runner.log
 jhw-test
+.jhw-cache/

Gemfile

@@ -14,3 +14,4 @@ gem 'rake', '0.8.7'
 gem 'mocha', '0.9.12'
 gem 'guard-jasmine-headless-webkit'
 gem 'facter'
+

lib/jasmine-headless-webkit.rb

@@ -1,7 +1,6 @@
 module Jasmine
   module Headless
-    module Webkit
+    autoload :CoffeeScriptCache, 'jasmine/headless/coffee_script_cache'
-    end
   end
 end
 

lib/jasmine/files_list.rb

@@ -1,3 +1,4 @@
+require 'jasmine/headless/coffee_script_cache'
 require 'jasmine-core'
 require 'iconv'
 
@@ -66,53 +67,26 @@ module Jasmine
 
     private
     def to_html(files)
-      coffeescript_run = []
-
       files.collect { |file|
-        coffeescript_run << file if (ext = File.extname(file)) == '.coffee'
+        case File.extname(file)
-          
+        when '.coffee'
-        output = []
+          begin
-        if (files.last == file or ext != '.coffee') and !coffeescript_run.empty?
+            %{<script type="text/javascript">#{Jasmine::Headless::CoffeeScriptCache.for(file)}</script>}
-          output << ensure_coffeescript_run!(coffeescript_run)
+          rescue CoffeeScript::CompilationError => ne
+            puts "[%s] %s: %s" % [ 'coffeescript'.color(:red), file.color(:yellow), ne.message.to_s.color(:white) ]
+            raise ne
+          rescue StandardError => e
+            puts "[%s] Error in compiling one of the followng: %s" % [ 'coffeescript'.color(:red), files.join(' ').color(:yellow) ]
+            raise e
           end
-
-        if ext != '.coffee'
-          output << case File.extname(file)
         when '.js'
           %{<script type="text/javascript" src="#{file}"></script>}
         when '.css'
           %{<link rel="stylesheet" href="#{file}" type="text/css" />}
         end
-        end
-
-        output
       }.flatten.reject(&:empty?)
     end
 
-    def ensure_coffeescript_run!(files)
-      data = StringIO.new
-      files.each { |file| data << File.read(file) << "\n" }
-      data.rewind
-
-      %{<script type="text/javascript">#{CoffeeScript.compile(data)}</script>}
-    rescue CoffeeScript::CompilationError => e
-      files.each do |file|
-        begin
-          CoffeeScript.compile(fh = File.open(file))
-        rescue CoffeeScript::CompilationError => ne
-          puts "[%s] %s: %s" % [ 'coffeescript'.color(:red), file.color(:yellow), ne.message.to_s.color(:white) ]
-          raise ne
-        ensure
-          fh.close
-        end
-      end
-    rescue StandardError => e
-      puts "[%s] Error in compiling one of the followng: %s" % [ 'coffeescript'.color(:red), files.join(' ').color(:yellow) ]
-      raise e
-    ensure
-      files.clear
-    end
-
     def spec_filter
       @spec_filter ||= (@options[:only] ? @options[:only].collect { |path| Dir[path] }.flatten : [])
     end

lib/jasmine/headless/coffee_script_cache.rb

@@ -0,0 +1,66 @@
+require 'coffee_script'
+require 'digest/sha1'
+require 'fileutils'
+
+module Jasmine
+  module Headless
+    class CoffeeScriptCache
+      class << self
+        def enabled=(bool)
+          @enabled = bool
+        end
+
+        def enabled?
+          @enabled = true if @enabled == nil
+          @enabled
+        end
+
+        def cache_dir=(dir)
+          @cache_dir = dir
+        end
+
+        def cache_dir
+          @cache_dir ||= '.jhw-cache'
+        end
+
+        def for(file)
+          new(file).handle
+        end
+      end
+
+      attr_reader :file
+
+      def initialize(file)
+        @file = file
+      end
+
+      def handle
+        if self.class.enabled?
+          if fresh?
+            File.read(cache_file)
+          else
+            result = compile
+            FileUtils.mkdir_p self.class.cache_dir
+            File.open(cache_file, 'wb') { |fh| fh.print result }
+            result
+          end
+        else
+          compile
+        end
+      end
+
+      def cache_file
+        @cache_file ||= File.join(self.class.cache_dir, Digest::SHA1.hexdigest(file))
+      end
+
+      def fresh?
+        File.exist?(cache_file) && (File.mtime(file) < File.mtime(cache_file))
+      end
+
+      def compile
+        CoffeeScript.compile(File.read(file))
+      end
+    end
+  end
+end
+

lib/jasmine/headless/options.rb

@@ -15,6 +15,7 @@ module Jasmine
         :report => false,
         :do_list => false,
         :full_run => true,
+        :enable_cache => true,
         :files => []
       }
 
@@ -42,6 +43,10 @@ module Jasmine
           @options[:colors] = true
         when '--no-colors', '-nc'
           @options[:colors] = false
+        when '--cache'
+          @options[:enable_cache] = true
+        when '--no-cache'
+          @options[:enable_cache] = false
         when '--keep'
           @options[:remove_html_file] = false
         when '--report'
@@ -67,6 +72,8 @@ module Jasmine
         command_line_args = GetoptLong.new(
           [ '--colors', '-c', GetoptLong::NO_ARGUMENT ],
           [ '--no-colors', GetoptLong::NO_ARGUMENT ],
+          [ '--cache', GetoptLong::NO_ARGUMENT ],
+          [ '--no-t stcache', GetoptLong::NO_ARGUMENT ],
           [ '--keep', GetoptLong::NO_ARGUMENT ],
           [ '--report', GetoptLong::REQUIRED_ARGUMENT ],
           [ '--jasmine-config', '-j', GetoptLong::REQUIRED_ARGUMENT ],

lib/jasmine/headless/runner.rb

@@ -61,6 +61,8 @@ module Jasmine
       end
 
       def run
+        Jasmine::Headless::CoffeeScriptCache.enabled = @options[:enable_cache]
+
         files_list = Jasmine::FilesList.new(
           :config => jasmine_config,
           :only => @options[:files]

spec/lib/jasmine/files_list_spec.rb

@@ -147,7 +147,6 @@ describe Jasmine::FilesList do
   describe '#.*files_to_html' do
     include FakeFS::SpecHelpers
 
-    context 'one coffeescript file' do
     before do
       files_list.instance_variable_set(:@files, [
                                        'test.js',
@@ -160,9 +159,7 @@ describe Jasmine::FilesList do
                                        'test.coffee'
       ])
 
-        File.open('test.coffee', 'w') { |fh| fh.print "first" }
+      Jasmine::Headless::CoffeeScriptCache.stubs(:for).with('test.coffee').returns("i compiled")
-
-        CoffeeScript.stubs(:compile).with() { |field| field.read == "first\n" }.returns("i compiled")
     end
 
     context '#files_to_html' do
@@ -185,49 +182,6 @@ describe Jasmine::FilesList do
     end
   end
 
-    context 'two coffeescript files' do
-      before do
-        files_list.instance_variable_set(:@files, [
-                                         'test.js',
-                                         'test.coffee',
-                                         'test2.coffee',
-                                         'test.css'
-        ])
-
-        files_list.instance_variable_set(:@filtered_files, [
-                                         'test.js',
-                                         'test.coffee'
-        ])
-
-        File.open('test.coffee', 'w') { |fh| fh.print "first" }
-        File.open('test2.coffee', 'w') { |fh| fh.print "second" }
-      end
-
-      context '#files_to_html' do
-        it "should create the right HTML" do
-          CoffeeScript.stubs(:compile).with() { |field| field.read == "first\nsecond\n" }.returns("i compiled")
-
-          files_list.files_to_html.should == [
-            %{<script type="text/javascript" src="test.js"></script>},
-            %{<script type="text/javascript">i compiled</script>},
-            %{<link rel="stylesheet" href="test.css" type="text/css" />}
-          ]
-        end
-      end
-
-      context '#filtered_files_to_html' do
-        it "should create the right HTML" do
-          CoffeeScript.stubs(:compile).with() { |field| field.read == "first\n" }.returns("i compiled")
-
-          files_list.filtered_files_to_html.should == [
-            %{<script type="text/javascript" src="test.js"></script>},
-            %{<script type="text/javascript">i compiled</script>}
-          ]
-        end
-      end
-    end
-  end
-
   describe '.get_spec_line_numbers' do
     let(:line_numbers) do
       described_class.get_spec_line_numbers(file)

spec/lib/jasmine/headless/coffee_script_cache_spec.rb

@@ -0,0 +1,87 @@
+require 'spec_helper'
+
+describe Jasmine::Headless::CoffeeScriptCache do
+  include FakeFS::SpecHelpers
+
+  let(:file) { 'file.coffee' }
+  let(:data) { 'data' }
+  let(:compiled) { 'compiled' }
+
+  before do
+    File.open(file, 'wb') { |fh| fh.print(data) }
+    described_class.cache_dir = cache_dir
+  end
+
+  let(:coffee_script_compiles!) do
+    CoffeeScript.expects(:compile).with(data).returns(compiled)
+  end
+
+  let(:cache_dir) { 'cache' }
+  let(:cache_file) { File.join(cache_dir, Digest::SHA1.hexdigest(file)) }
+  let(:cache_file_data) { File.read(cache_file) }
+
+  describe '.for' do
+    context 'cache disabled' do
+      before do
+        described_class.enabled = false
+        p described_class.enabled?
+      end
+
+      it 'should compile' do
+        coffee_script_compiles!
+        described_class.for(file).should == compiled
+        cache_file.should_not be_a_file
+      end
+    end
+
+    context 'cache enabled' do
+      before do
+        described_class.enabled = true
+        FileUtils.mkdir_p(cache_dir)
+
+        File.stubs(:mtime).with(file).returns(Time.at(10))
+        File.stubs(:mtime).with(cache_file).returns(Time.at(cache_file_mtime))
+      end
+
+      context 'cache empty' do
+        let(:cache_file_mtime) { 0 }
+
+        it 'should compile' do
+          coffee_script_compiles!
+          described_class.for(file).should == compiled
+
+          cache_file_data.should == compiled
+        end
+      end
+
+      context 'cache fresh' do
+        let(:cache_file_mtime) { 15 }
+
+        before do
+          File.open(cache_file, 'wb') { |fh| fh.print compiled }
+        end
+
+        it 'should not compile' do
+          coffee_script_compiles!.never
+
+          described_class.for(file).should == compiled
+
+          cache_file_data.should == compiled
+        end
+      end
+
+      context 'cache stale' do
+        let(:cache_file_mtime) { 5 }
+
+        it 'should compile' do
+          coffee_script_compiles!
+
+          described_class.for(file).should == compiled
+
+          cache_file_data.should == compiled
+        end
+      end
+    end
+  end
+end
+

spec/spec_helper.rb

@@ -1,3 +1,6 @@
+require 'jasmine-headless-webkit'
+require 'fakefs/spec_helpers'
+
 RSpec.configure do |c|
   c.mock_with :mocha
 end
@@ -10,7 +13,8 @@ if !File.file?(specrunner)
   end
 end
 
-RSpec::Matchers.define :be_a_report_containing do |total, fails, used_console|
+module RSpec::Matchers
+  define :be_a_report_containing do |total, fails, used_console|
     match do |filename|
       parts(filename).length.should == 4
       parts[0].should == total.to_s
@@ -29,7 +33,7 @@ RSpec::Matchers.define :be_a_report_containing do |total, fails, used_console|
     end
   end
 
-RSpec::Matchers.define :contain_a_failing_spec do |*parts|
+  define :contain_a_failing_spec do |*parts|
     match do |filename|
       report(filename).include?(parts.join("||")).should be_true
     end
@@ -39,3 +43,9 @@ RSpec::Matchers.define :contain_a_failing_spec do |*parts|
     end
   end
 
+  define :be_a_file do
+    match do |file|
+      File.file?(file)
+    end
+  end
+end