Hack a way to pass Middleman context into Slim filters

CHANGELOG.md

@@ -1,6 +1,7 @@
 Master
 ===
 
+* Fix Sass/Scss filter in Slim templates
 * Added SMACSS template
 * Give file metadata (such as frontmatter) precedence over path meta. #552
 * Add `sass_assets_paths` option for arbitrary sass partial locations.

middleman-core/lib/middleman-core/application.rb

@@ -223,7 +223,7 @@ module Middleman
     # messages, which can take a long time (minutes at full CPU)
     # if the object is huge or has cyclic references, like this.
     def to_s
-      "the Middleman application context"
+      "#<Middleman::Application>"
     end
 
     # Expand a path to include the index file if it's a directory

middleman-core/lib/middleman-core/renderers/sass.rb

@@ -39,6 +39,14 @@ module Middleman
       # A SassTemplate for Tilt which outputs debug messages
       class SassPlusCSSFilenameTemplate < ::Tilt::SassTemplate
 
+        def initialize(*args, &block)
+          super
+          
+          if @options.has_key?(:context)
+            @context = @options[:context]
+          end
+        end
+        
         # Define the expected syntax for the template
         # @return [Symbol]
         def syntax
@@ -52,7 +60,7 @@ module Middleman
         # @param [Hash] locals
         # @return [String]
         def evaluate(context, locals, &block)
-          @context = context
+          @context ||= context
           @engine = ::Sass::Engine.new(data, sass_options)
 
           begin
@@ -62,17 +70,20 @@ module Middleman
           end
         end
 
-      private
         # Change Sass path, for url functions, to the build folder if we're building
         # @return [Hash]
         def sass_options
-          location_of_sass_file = File.expand_path(@context.source, @context.root)
-
-          parts = basename.split('.')
-          parts.pop
-          css_filename = File.join(location_of_sass_file, @context.css_dir, parts.join("."))
-
-          options.merge(:filename => eval_file, :line => line, :syntax => syntax, :css_filename => css_filename)
+          more_opts = { :filename => eval_file, :line => line, :syntax => syntax }
+          
+          if @context.is_a?(::Middleman::Application) && file
+            location_of_sass_file = File.expand_path(@context.source, @context.root)
+          
+            parts = basename.split('.')
+            parts.pop
+            more_opts[:css_filename] = File.join(location_of_sass_file, @context.css_dir, parts.join("."))
+          end
+          
+          options.merge(more_opts)
         end
       end
 

middleman-core/lib/middleman-core/renderers/slim.rb

@@ -21,6 +21,14 @@ module Middleman
             :buffer    => '@_out_buf',
             :generator => ::Temple::Generators::StringBuffer
           )
+          
+          app.after_configuration do
+            sass_context_hack = {
+              :context => self
+            }
+            ::Slim::EmbeddedEngine.default_options[:sass] = sass_context_hack
+            ::Slim::EmbeddedEngine.default_options[:scss] = sass_context_hack
+          end
         end
 
         alias :included :registered

middleman-more/features/slim.feature

@@ -18,4 +18,52 @@ Feature: Support slim templating language
       """
     And the Server is running at "empty_app"
     When I go to "/slim.html"
-    Then I should see "<h1>Welcome to Slim</h1>"
+    Then I should see "<h1>Welcome to Slim</h1>"
+
+  Scenario: Rendering Scss in a Slim filter
+    Given an empty app
+    And a file named "config.rb" with:
+      """
+      """
+    And a file named "source/scss.html.slim" with:
+      """
+      doctype 5
+      html lang='en'
+        head
+          meta charset="utf-8"
+          scss:
+            @import "compass";
+            @include global-reset;
+        body
+          h1 Welcome to Slim
+      """
+    And a file named "source/sass.html.slim" with:
+      """
+      doctype 5
+      html lang='en'
+        head
+          meta charset="utf-8"
+          sass:
+            @import "compass"
+            +global-reset
+        body
+          h1 Welcome to Slim
+      """
+    And a file named "source/error.html.slim" with:
+      """
+      doctype 5
+      html lang='en'
+        head
+          meta charset="utf-8"
+          scss:
+            +global-reset
+        body
+          h1 Welcome to Slim
+      """
+    And the Server is running at "empty_app"
+    When I go to "/scss.html"
+    Then I should see "html, body, div"
+    When I go to "/sass.html"
+    Then I should see "html, body, div"
+    When I go to "/error.html"
+    Then I should see "Syntax error"

middleman-more/lib/middleman-more/core_extensions/compass.rb

@@ -73,7 +73,6 @@ module Middleman
 
     # A Compass Sass template for Tilt, adding our options in
     class CompassSassTemplate < ::Middleman::Renderers::Sass::SassPlusCSSFilenameTemplate
-    private
       def sass_options
         super.merge(::Compass.configuration.to_sass_engine_options)
       end
@@ -81,7 +80,6 @@ module Middleman
 
     # A Compass Scss template for Tilt, adding our options in
     class CompassScssTemplate < ::Middleman::Renderers::Sass::ScssPlusCSSFilenameTemplate
-    private
       def sass_options
         super.merge(::Compass.configuration.to_sass_engine_options)
       end