Fixes #245, fixes #180. Add Preserve new lines support for LESS/SCSS

lib/langs/css-prettydiff-beautify.coffee

@@ -7,7 +7,9 @@ module.exports = (text, options, callback) ->
     mode: "beautify"
     inchar: options.indent_character
     insize: options.indent_size
-    alphasort: options.alphasort || false
+    alphasort: options.alphasort or false
+    preserve: (if (options.preserve_newlines is true ) then \
+        "all" else "none")
 
   output = prettydiff.api(args)
   result = output[0]

lib/language-options.coffee

@@ -166,6 +166,13 @@ module.exports =
         type: 'boolean'
         default: false
         description: "Add a newline between CSS rules"
+    css_preserve_newlines:
+        type: 'boolean'
+        default: false
+        description: "(Only LESS/SASS/SCSS with Prettydiff) "+
+            "Retain empty lines. "+
+            "Consecutive empty lines will be converted to a single empty line."
+
 
     # HTML
     html_htmlbeautifier_path:

package.json

@@ -62,7 +62,7 @@
     "loophole": "^1.0.0",
     "node-dir": "^0.1.6",
     "node-uuid": "^1.4.1",
-    "prettydiff": "^1.11.0",
+    "prettydiff": "^1.11.2",
     "space-pen": "^4.3.0",
     "strip-json-comments": "^0.1.3",
     "temp": "^0.8.0",