Add support for inline source maps

nanoc/lib/nanoc/filters/sass.rb

@@ -27,10 +27,22 @@ def render(filter, rep, content, params = {})
       )
       css_path = options.delete(:css_path)
       sourcemap_path = options.delete(:sourcemap_path)
+      if sourcemap_path == :inline
+        sourcemap_path = Nanoc::Int::TempFilenameFactory.instance.create('sass_sourcemap')
+        inline = true
+      end
 
       engine = ::Sass::Engine.new(content, options)
       css, sourcemap = sourcemap_path ? engine.render_with_sourcemap(sourcemap_path) : engine.render
-      [css, sourcemap&.to_json(css_uri: rep.path, type: rep.path.nil? ? :inline : :auto)]
+
+      if inline
+        require 'base64'
+        sourcemap = sourcemap&.to_json(css_uri: css_path)
+        encoded = "data:application/json;base64,#{Base64.urlsafe_encode64(sourcemap)}"
+        [css.gsub(%r{^/\*#\s+sourceMappingURL=\s*#{sourcemap_path}\s*\*/$}, "/*# sourceMappingURL=#{encoded} */")]
+      else
+        [css, sourcemap&.to_json(css_path: css_path, sourcemap_path: sourcemap_path)]
+      end
     end
   end
 

nanoc/spec/nanoc/filters/sass_spec.rb

@@ -270,6 +270,11 @@
         expect(sass_sourcemap.setup_and_run(".foo #bar\n  color: #f00", css_path: 'main.css', sourcemap_path: 'main.css.map'))
           .to match(/{.*?"sources": \["#{item_main_default_rep.raw_path}"\].*?"file": "main.css".*?}/m)
       end
+
+      it 'generates inlined sourcemaps' do
+        expect(sass.setup_and_run(".foo #bar\n  color: #f00", css_path: 'main.css', sourcemap_path: :inline))
+          .to match(/.foo\s+#bar\s*\{\s*color:\s+(red|#f00);?\s*\}\s*\/\*# sourceMappingURL=data:application\/json;base64.*? \*\//)
+      end
     end
 
     context 'nanoc() sass function' do