Subcommand for CSS validation.

features/command_line.feature

@@ -204,7 +204,7 @@ Feature: Command Line
     Given I am using the existing project in test/fixtures/stylesheets/compass
     When I run: compass validate
     Then my css is validated
-    And I am informed that it is not, because IE6 hacks suck.
+    And I am informed that my css is valid.
 
   Scenario: Get stats for my project
     Given I am using the existing project in test/fixtures/stylesheets/compass

features/step_definitions/command_line_steps.rb

@@ -170,11 +170,11 @@ Then /^the following configuration properties are set in config\/compass\.rb:$/
 end
 
 Then /^my css is validated$/ do
-  pending
+  @last_result.should =~ /Compass CSS Validator/
 end
 
-Then /^I am informed that it is not, because IE6 hacks suck\.$/ do
-  pending
+Then /^I am informed that my css is valid.$/ do
+  @last_result.should =~ /Your CSS files are valid\./
 end
 
 Then /^I am told statistics for each file:$/ do |table|

lib/compass/commands/validate_project.rb

@@ -3,8 +3,26 @@ require 'compass/commands/update_project'
 
 module Compass
   module Commands
+    module ValidationOptionsParser
+      def set_options(opts)
+        opts.banner = %Q{
+          Usage: compass validate [path/to/project] [options]
+
+          Description:
+            Compile project at the path specified or the current
+            directory if not specified and then validate the 
+            generated CSS.
+
+          Options:
+        }.strip.split("\n").map{|l| l.gsub(/^ {0,10}/,'')}.join("\n")
+
+        super
+      end
+    end
     class ValidateProject < ProjectBase
 
+      register :validate
+
       def initialize(working_path, options)
         super
         assert_project_directory_exists!
@@ -16,6 +34,42 @@ module Compass
         Validator.new(project_css_subdirectory).validate()
       end
 
+      class << self
+
+        def option_parser(arguments)
+          parser = Compass::Exec::CommandOptionParser.new(arguments)
+          parser.extend(Compass::Exec::GlobalOptionsParser)
+          parser.extend(Compass::Exec::ProjectOptionsParser)
+          parser.extend(ValidationOptionsParser)
+        end
+
+        def usage
+          option_parser([]).to_s
+        end
+
+        def description(command)
+          "Validate your generated css."
+        end
+
+        def parse!(arguments)
+          parser = option_parser(arguments)
+          parser.parse!
+          parse_arguments!(parser, arguments)
+          parser.options
+        end
+
+        def parse_arguments!(parser, arguments)
+          if arguments.size == 1
+            parser.options[:project_name] = arguments.shift
+          elsif arguments.size == 0
+            # default to the current directory.
+          else
+            raise Compass::Error, "Too many arguments were specified."
+          end
+        end
+
+      end
+
     end
   end
 end