support config.sass.load_paths

closes #66

Author: dreyks

lib/sassc/rails/template.rb

@@ -26,7 +26,7 @@ def call(input)
             environment: input[:environment],
             dependencies: context.metadata[:dependency_paths]
           }
-        }.merge(config_options)
+        }.merge(config_options) { |*args| safe_merge(*args) }
 
         engine = ::SassC::Engine.new(input[:data], options)
 
@@ -56,7 +56,7 @@ def evaluate(context, locals, &block)
             context: context,
             environment: context.environment
           }
-        }.merge(config_options)
+        }.merge(config_options, &method(:safe_merge))
 
         ::SassC::Engine.new(data, options).render
       end
@@ -69,7 +69,7 @@ def evaluate(context, locals, &block)
     end
 
     def config_options
-      opts = { style: sass_style }
+      opts = { style: sass_style, load_paths: load_paths }
 
 
       if Rails.application.config.sass.inline_source_maps
@@ -87,9 +87,23 @@ def sass_style
       (Rails.application.config.sass.style || :expanded).to_sym
     end
 
+    def load_paths
+      Rails.application.config.sass.load_paths || []
+    end
+
     def line_comments?
       Rails.application.config.sass.line_comments
     end
+
+    def safe_merge(key, left, right)
+      if [left, right].all? { |v| v.is_a? Hash }
+        left.merge(right) { |*args| safe_merge *args }
+      elsif [left, right].all? { |v| v.is_a? Array }
+        (left + right).uniq
+      else
+        right
+      end
+    end
   end
 
   class ScssTemplate < SassTemplate

test/dummy/app/assets/stylesheets/imports_test.scss

@@ -13,6 +13,7 @@
 @import "css_sass_handler";
 @import "css_scss_erb_handler";
 @import "css_sass_erb_handler";
+@import 'partial_in_load_paths';
 
 .main {
   color: yellow;

test/dummy/app/assets/stylesheets/in_load_paths/partial_in_load_paths.scss

@@ -0,0 +1,3 @@
+.partial_in_load_paths {
+  color: #BADA55
+}

test/sassc_rails_test.rb

@@ -116,6 +116,7 @@ def test_sass_asset_paths_work
   end
 
   def test_sass_imports_work_correctly
+    app.config.sass.load_paths << Rails.root.join('app/assets/stylesheets/in_load_paths')
     initialize!
 
     css_output = render_asset("imports_test.css")
@@ -145,6 +146,8 @@ def test_sass_imports_work_correctly
 
     assert_match /globbed/,                  css_output
     assert_match /nested-glob/,              css_output
+
+    assert_match /partial_in_load_paths/,    css_output
   end
 
   def test_style_config_item_is_defaulted_to_expanded_in_development_mode