Added support of any number of arguments in context helpers and tests

.gitignore

@@ -6,3 +6,4 @@ npm-debug.log
 
 tmp/
 doc/
+.idea

lib/mincer/engines/less_engine.js

@@ -162,15 +162,14 @@ LessEngine.prototype.evaluate = function (context, locals) {
   var error  = null,
       result = null;
 
-  var fixedLocals = {};
-  Object.keys(locals).forEach(function(local) {
-    fixedLocals[local] = function(lessArg) {
-      return new less.tree.Anonymous(locals[local](lessArg.value));
+  _.forEach(locals, function(localFunc, localName) {
+    less.tree.functions[localName] = function() {
+      var extractedLessArguments = _.map(arguments, 'value');
+
+      return new less.tree.Anonymous(localFunc.apply(undefined, extractedLessArguments));
     };
   });
 
-  _.extend(less.tree.functions, fixedLocals);
-
   var parser = new (less.Parser)({
     paths:          [path.dirname(this.file)].concat(context.environment.paths),
     optimization:   1,

test/engines_test.js

@@ -25,4 +25,13 @@ describe("Engines", function () {
     });
   });
 
+  describe("LESS", function () {
+
+    it("should support context helpers", function () {
+      var asset = env.findAsset("less_engine/stylesheet");
+      assert(asset.toString().match(/\/assets\/ixti-[a-f0-9]{32}.gif/));
+      assert(asset.toString().match(/data:image\/gif;base64/));
+    });
+  });
+
 });

test/fixtures/less_engine/stylesheet.css.less

@@ -0,0 +1,6 @@
+@var: asset_path("ixti.gif");
+@dataUri: asset_data_uri("ixti.gif");
+
+.class:before { content: @var; }
+.class2 { background-image: @dataUri; }
+