Return a non-zero exit code if there are any stylesheet compilation errors. Closes GH-432.

features/command_line.feature

@@ -63,6 +63,15 @@ Feature: Command Line
     And I am told that I can place stylesheets in the sass subdirectory
     And I am told how to compile my sass stylesheets
 
+  Scenario: Compiling a project with errors
+    Given I am using the existing project in test/fixtures/stylesheets/compass
+    And the project has a file named "sass/error.scss" containing:
+      """
+        .broken {
+      """
+    When I run: compass compile
+    Then the command exits with a non-zero error code
+
   Scenario: Creating a bare project with a framework
     When I create a project using: compass create bare_project --using blueprint --bare
     Then an error message is printed out: A bare project cannot be created when a framework is specified.

features/step_definitions/command_line_steps.rb

@@ -53,6 +53,13 @@ Given /^I should clean up the directory: (\w+)$/ do |directory|
   @cleanup_directories << directory
 end
 
+Given %r{^the project has a file named "([^"]*)" containing:$} do |arg1, string|
+  File.open(arg1, "w") do |f|
+    f << string
+  end
+end
+
+
 # When Actions are performed
 When /^I create a project using: compass create ([^\s]+) ?(.+)?$/ do |dir, args|
   @cleanup_directories << dir

lib/compass/commands/base.rb

@@ -22,6 +22,14 @@ module Compass
         raise StandardError.new("Not Implemented")
       end
 
+      def successful?
+        !@failed
+      end
+
+      def failed!
+        @failed = true
+      end
+
       protected
 
       def framework

lib/compass/commands/update_project.rb

@@ -34,7 +34,8 @@ module Compass
         compiler = new_compiler_instance
         check_for_sass_files!(compiler)
         compiler.clean! if compiler.new_config?
-        compiler.run
+        error_count = compiler.run
+        failed! if error_count > 0
       end
 
       def check_for_sass_files!(compiler)

lib/compass/compiler.rb

@@ -82,6 +82,7 @@ module Compass
     end
 
     def run
+      failure_count = 0
       if new_config?
         # Wipe out the cache and force compilation if the configuration has changed.
         remove options[:cache_location] if options[:cache_location]
@@ -97,6 +98,7 @@ module Compass
           begin
             compile_if_required sass_filename, css_filename
           rescue Sass::SyntaxError => e
+            failure_count += 1
             handle_exception(sass_filename, css_filename, e)
           end
         end
@@ -104,6 +106,7 @@ module Compass
       if options[:time]
         puts "Compilation took #{(result.__duration * 1000).round / 1000.0}s"
       end
+      return failure_count
     end
 
     def compile_if_required(sass_filename, css_filename)

lib/compass/exec/sub_command_ui.rb

@@ -12,8 +12,7 @@ module Compass::Exec
 
     def run!
       begin
-        perform!
-        return 0
+        return perform!
       rescue Exception => e
         raise e if e.is_a? SystemExit
         if e.is_a?(::Compass::Error) || e.is_a?(OptionParser::ParseError)
@@ -40,7 +39,9 @@ module Compass::Exec
       else
         command_class.parse!(args)
       end
-      command_class.new(Dir.getwd, @options).execute
+      cmd = command_class.new(Dir.getwd, @options)
+      cmd.execute
+      cmd.successful? ? 0 : 1
     rescue OptionParser::ParseError => e
       puts "Error: #{e.message}"
       puts command_class.usage if command_class.respond_to?(:usage)