generate a real version hash

AssetFile

@@ -7,6 +7,8 @@ require 'compass'
 Compass.configuration.images_path = 'assets/images'
 Compass.configuration.add_import_path File.expand_path('../assets/stylesheets', __FILE__)
 
+Travis::Version.update
+
 output 'public/javascripts'
 input 'assets/javascripts' do
   match 'app/templates/**/*.hbs' do

lib/rake-pipeline/travis.rb

@@ -1,65 +1,6 @@
-require 'rake-pipeline'
-require 'execjs'
-require 'uglifier'
-
 module Travis
-  class HandlebarsFilter < Rake::Pipeline::Filter
-    class << self
-      def source
-        [
-          File.read('lib/rake-pipeline/ember-headless.js'),
-          File.read('assets/javascripts/vendor/handlebars.js'),
-          File.read('assets/javascripts/vendor/ember.js')
-        ].join("\n")
-      end
-
-      def context
-        @@context ||= ExecJS.compile(source)
-      end
-
-      def compile(source)
-        context.call('compileHandlebarsTemplate', source + "\n")
-      end
-    end
-
-    def generate_output(inputs, output)
-      inputs.each do |input|
-        source = self.class.compile(input.read)
-        source = wrap(name(input.path), source)
-        output.write source
-      end
-    end
-
-    def wrap(name, source)
-      "\nEmber.TEMPLATES['#{name}'] = Ember.Handlebars.template(#{source});\n"
-    end
-
-    def name(path)
-      path.sub(%r(^app/templates/), '').sub(/\.hbs$/, '')
-    end
-  end
-
-  class SafeConcatFilter < Rake::Pipeline::Filter
-    def generate_output(inputs, output)
-      inputs.each do |input|
-        source = File.read(input.fullpath) + ";"
-        output.write source
-      end
-    end
-  end
-
-  class ProductionFilter < Rake::Pipeline::Filter
-    def generate_output(inputs, output)
-      inputs.each do |input|
-        source = File.read(input.fullpath)
-        source = strip_debug(source)
-        source = Uglifier.compile(source)
-        output.write source
-      end
-    end
-
-    def strip_debug(source)
-      source.gsub(%r{^(\s)*Ember\.(assert|deprecate|warn)\((.*)\).*$}, "")
-    end
-  end
+  autoload :HandlebarsFilter, 'rake-pipeline/travis/filters'
+  autoload :SafeConcatFilter, 'rake-pipeline/travis/filters'
+  autoload :ProductionFilter, 'rake-pipeline/travis/filters'
+  autoload :Version,          'rake-pipeline/travis/version'
 end

lib/rake-pipeline/travis/filters.rb

@@ -0,0 +1,65 @@
+require 'rake-pipeline'
+require 'execjs'
+require 'uglifier'
+
+module Travis
+  class HandlebarsFilter < Rake::Pipeline::Filter
+    class << self
+      def source
+        [
+          File.read('lib/rake-pipeline/ember-headless.js'),
+          File.read('assets/javascripts/vendor/handlebars.js'),
+          File.read('assets/javascripts/vendor/ember.js')
+        ].join("\n")
+      end
+
+      def context
+        @@context ||= ExecJS.compile(source)
+      end
+
+      def compile(source)
+        context.call('compileHandlebarsTemplate', source + "\n")
+      end
+    end
+
+    def generate_output(inputs, output)
+      inputs.each do |input|
+        source = self.class.compile(input.read)
+        source = wrap(name(input.path), source)
+        output.write source
+      end
+    end
+
+    def wrap(name, source)
+      "\nEmber.TEMPLATES['#{name}'] = Ember.Handlebars.template(#{source});\n"
+    end
+
+    def name(path)
+      path.sub(%r(^app/templates/), '').sub(/\.hbs$/, '')
+    end
+  end
+
+  class SafeConcatFilter < Rake::Pipeline::Filter
+    def generate_output(inputs, output)
+      inputs.each do |input|
+        source = File.read(input.fullpath) + ";"
+        output.write source
+      end
+    end
+  end
+
+  class ProductionFilter < Rake::Pipeline::Filter
+    def generate_output(inputs, output)
+      inputs.each do |input|
+        source = File.read(input.fullpath)
+        source = strip_debug(source)
+        source = Uglifier.compile(source)
+        output.write source
+      end
+    end
+
+    def strip_debug(source)
+      source.gsub(%r{^(\s)*Ember\.(assert|deprecate|warn)\((.*)\).*$}, "")
+    end
+  end
+end

lib/rake-pipeline/travis/version.rb

@@ -0,0 +1,54 @@
+require 'pathname'
+require 'digest/md5'
+
+module Travis
+  class Version
+    FILE_NAME = 'public/version'
+    SOURCES = %w(AssetFile Gemfile.lock assets)
+
+    def self.update
+      new.update
+    end
+
+    attr_reader :root
+
+    def initialize(root = nil)
+      @root = Pathname.new(root || File.expand_path('.'))
+    end
+
+    def read
+      file.read
+    end
+
+    def update
+      @hash = nil
+      write(hash)
+      hash
+    end
+
+    protected
+
+      def file
+        root.join(FILE_NAME)
+      end
+
+      def write(version)
+        file.open('w+') { |f| f.write(version) }
+      end
+
+      def hash
+        @hash ||= digest.to_s[0..7]
+      end
+
+      def digest
+        Digest::MD5.new << `ls -lAR #{sources.join(' ')} | awk '{print $5, $6, $7, $9}'`
+      end
+
+      def sources
+        SOURCES.map do |source|
+          source = root.join(source)
+          source.to_s if source.exist?
+        end.compact
+      end
+  end
+end

public/version

@@ -1 +1 @@
-1
+bcf31bce