Extract a project compiler class from the update_project command.

lib/compass/actions.rb

@@ -57,8 +57,6 @@ module Compass
 
     # Compile one Sass file
     def compile(sass_filename, css_filename, options)
-      target_directory = File.dirname(css_filename)
-      directory target_directory
       logger.record :compile, basename(sass_filename)
       if File.exists?(css_filename)
         logger.record :overwrite, basename(css_filename)

lib/compass/commands/update_project.rb

@@ -1,4 +1,5 @@
 require File.join(File.dirname(__FILE__), 'project_base')
+require File.join(Compass.lib_directory, 'compass', 'compiler')
 
 module Compass
   module Commands
@@ -13,13 +14,10 @@ module Compass
         read_project_configuration
         default_options = { :style => default_output_style }
         compilation_options = default_options.merge(options).merge(:load_paths => sass_load_paths)
-        Dir.glob(separate("#{project_src_directory}/**/[^_]*.sass")).each do |sass_file|
-          stylesheet_name = sass_file[("#{project_src_directory}/".length)..-6]
-
-          sass_filename = projectize("#{project_src_subdirectory}/#{stylesheet_name}.sass")
-          css_filename = projectize("#{project_css_subdirectory}/#{stylesheet_name}.css")
-          compile sass_filename, css_filename, compilation_options
-        end
+        Compass::Compiler.new(working_path,
+                              projectize(project_src_subdirectory),
+                              projectize(project_css_subdirectory),
+                              compilation_options).run
       end
       
       def default_output_style

lib/compass/compiler.rb

@@ -0,0 +1,40 @@
+module Compass
+  class Compiler
+
+    include Actions
+
+    attr_accessor :working_path, :from, :to, :options
+
+    def initialize(working_path, from, to, options)
+      self.working_path = working_path
+      self.from, self.to = from, to
+      self.logger = options.delete(:logger)
+      self.options = options
+    end
+
+    def sass_files
+      @sass_files || Dir.glob(separate("#{from}/**/[^_]*.sass"))
+    end
+
+    def stylesheet_name(sass_file)
+      sass_file[("#{from}/".length)..-6]
+    end
+
+    def css_files
+      @css_files || sass_files.map{|sass_file| "#{to}/#{stylesheet_name(sass_file)}.css"}
+    end
+
+    def target_directories
+      css_files.map{|css_file| File.dirname(css_file)}.uniq.sort.sort_by{|d| d.length }
+    end
+
+    def run
+      target_directories.each do |dir|
+        directory dir
+      end
+      sass_files.zip(css_files).each do |sass_filename, css_filename|
+        compile sass_filename, css_filename, options
+      end
+    end
+  end
+end