lib/locomotive/steam/initializers/sprockets.rb in locomotivecms_steam-1.1.0.rc3 vs lib/locomotive/steam/initializers/sprockets.rb in locomotivecms_steam-1.1.0

@@ -1,13 +1,70 @@
 require 'sprockets'
 require 'sass'
 require 'coffee_script'
 require 'compass'
 require 'autoprefixer-rails'
+require 'open3'
 
 module Locomotive::Steam
 
+  class YUICompressorRuntimeError < RuntimeError
+    attr_reader :errors
+    #:nocov:
+    def initialize(msg, errors)
+      super(msg)
+      @errors = errors
+    end
+  end
+
+  module YUICompressorErrors
+
+    #:nocov:
+    def compress(stream_or_string)
+      streamify(stream_or_string) do |stream|
+        tempfile      = new_tempfile(stream)
+        full_command  = "%s %s" % [command, tempfile.path]
+
+        output, errors, exit_status = _compress(full_command, tempfile)
+
+        if exit_status.exitstatus.zero?
+          output
+        else
+          # Bourne shells tend to blow up here when the command fails, usually
+          # because java is missing
+          raise YUICompressorRuntimeError.new("Command '%s' returned non-zero exit status" %
+            full_command, errors)
+        end
+      end
+    end
+
+    #:nocov:
+    def _compress(command, tempfile)
+      begin
+        # FIXME: catch only useful information from the stderr output
+        # output, errors, exit_status = '', [], nil
+        output, errors, exit_status = Open3.capture3(command)
+        errors = errors.split("\n").find_all { |l| l =~ /\s+[0-9]/ }
+        [output, errors, exit_status]
+      rescue Exception => e
+        # windows shells tend to blow up here when the command fails
+        raise RuntimeError, "compression failed: %s" % e.message
+      ensure
+        tempfile.close!
+      end
+    end
+
+    #:nocov:
+    def new_tempfile(stream)
+      Tempfile.new('yui_compress').tap do |tempfile|
+        tempfile.write stream.read
+        tempfile.flush
+      end
+    end
+
+  end
+
   class SprocketsEnvironment < ::Sprockets::Environment
 
     def initialize(root, options = {})
       super(root)
 
@@ -31,12 +88,16 @@
     end
 
     def install_yui_compressor(options)
       return unless options[:minify]
 
-      require 'yui/compressor'
-
       if is_java_installed?
+        require 'yui/compressor'
+
+        [YUI::JavaScriptCompressor, YUI::CssCompressor].each do |klass|
+          klass.send(:include, YUICompressorErrors)
+        end
+
         # minify javascripts and stylesheets
         self.js_compressor  = YUI::JavaScriptCompressor.new
         self.css_compressor = YUI::CssCompressor.new
       else
         message = "[Important] YUICompressor requires java to be installed. The JAVA_HOME variable should also be set.\n"