From 78385525743049340fb59f55d83a5f73c1b67b16 Mon Sep 17 00:00:00 2001
From: Josh Yudaken <j@yud.co.za>
Date: Mon, 23 Jan 2012 18:21:07 +0200
Subject: [PATCH] implement luma() function call

---
 lib/less/functions.js    | 5 +++++
 test/css/functions.css   | 1 +
 test/less/functions.less | 1 +
 3 files changed, 7 insertions(+)

diff --git a/lib/less/functions.js b/lib/less/functions.js
index 6eb34bac8..1a10f8ca6 100644
--- a/lib/less/functions.js
+++ b/lib/less/functions.js
@@ -44,6 +44,11 @@ tree.functions = {
     alpha: function (color) {
         return new(tree.Dimension)(color.toHSL().a);
     },
+    luma: function (color) {
+        return new(tree.Dimension)(Math.round(color.rgb[0]*30/255 + 
+                                              color.rgb[1]*59/255 +
+                                              color.rgb[2]*11/255), '%');
+    },
     saturate: function (color, amount) {
         var hsl = color.toHSL();
 
diff --git a/test/css/functions.css b/test/css/functions.css
index 823281457..0f625a2b0 100644
--- a/test/css/functions.css
+++ b/test/css/functions.css
@@ -22,6 +22,7 @@
   hue: 98;
   saturation: 12%;
   lightness: 95%;
+  luma: 23%;
   rounded: 11;
   roundedpx: 3px;
   percentage: 20%;
diff --git a/test/less/functions.less b/test/less/functions.less
index 535d2efde..bd2699553 100644
--- a/test/less/functions.less
+++ b/test/less/functions.less
@@ -26,6 +26,7 @@
   hue: hue(hsl(98, 12%, 95%));
   saturation: saturation(hsl(98, 12%, 95%));
   lightness: lightness(hsl(98, 12%, 95%));
+  luma: luma(rgb(180, 0, 50));
   rounded: round(@r/3);
   roundedpx: round(10px / 3);
   percentage: percentage(10px / 50);