Initial.

Author: rstacruz

README.md

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+Why you want it
+---------------
+
+    $ bundle exec rake assets:precompile:profile
+    application.js                                              6663ms
+    new_project.js                                              367ms
+    vendor.js                                                   966ms
+    application.css                                             8579ms
+    styleguide-extras.css                                       271ms
+    styleguide.css                                              429ms
+    Compilation finished in 17765ms.
+
+How to use it
+-------------
+
+    # Gemfile
+    gem 'rails-asset_profile', github: 'nadarei/rails-asset_profile', branch: 'master'
+
+License
+-------
+
+MIT.
+

lib/rails/asset_profile.rb

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+module Rails
+  module AssetProfile
+    class Engine < Rails::Engine
+
+    end
+  end
+end

lib/tasks/assets.rake

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+desc "Compile all assets named in config.assets.precompile, and show breakdown of their compilation speed"
+task :'assets:precompile:profile' => ['assets:environment'] do
+  module Sprockets
+    class StaticCompiler
+      # Re-implement #compile to measure the time it takes.
+      def compile
+        time, result = measure { do_compile }
+        puts "Compilation finished in %ims." % [time]
+        result
+      end
+
+      # Re-implement #compile to measuge the time and print it.
+      def do_compile
+        manifest = {}
+        env.each_logical_path do |logical_path|
+          next unless compile_path?(logical_path)
+
+          show = show_message?(logical_path)
+          print "%-60s" % [logical_path] if show
+
+          time, _ = measure {
+            if asset = env.find_asset(logical_path)
+              write_asset_to(asset, asset.logical_path)
+              write_asset_to(asset, asset.digest_path) if @digest
+              manifest[logical_path] = path_for(asset)
+            end
+          }
+
+          puts "%ims" % [time] if show
+        end
+
+        write_manifest(manifest) if @manifest
+      end
+
+      # Re-implement write_asset to write to digest and local path simultaneously
+      def write_asset_to(asset, path)
+        filename = File.join(target, path)
+        FileUtils.mkdir_p File.dirname(filename)
+        asset.write_to(filename)
+        asset.write_to("#{filename}.gz") if filename.to_s =~ /\.(css|js)$/
+        path
+      end
+
+    private
+
+      def show_message?(path)
+        return true if ENV['VERBOSE'] || ENV['verbose']
+        path =~ /\.(css|js)$/
+      end
+
+      def measure(&blk)
+        t = Time.now
+        output = yield
+        [((Time.now - t) * 1000).to_i, output]
+      end
+    end
+  end
+
+  Rake::Task[:'assets:precompile:primary'].invoke
+end

rails-asset_profile.gemspec

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+Gem::Specification.new do |s|
+  s.name = "rails-asset_profile"
+  s.version = "0.0.1"
+  s.summary = "Profiled asset compilation for Rails"
+  s.description = "Shows you stats on how long each asset compiles."
+  s.authors = ["Rico Sta. Cruz"]
+  s.email = ["[email protected]"]
+  s.homepage = "http://github.com/nadarei/rails-asset_profile"
+  s.files = `git ls-files`.strip.split("\n")
+  s.executables = Dir["bin/*"].map { |f| File.basename(f) }
+
+  s.add_dependency "rails", "~> 3.2.0"
+end