From 7cd11d79d7dbd84a02201e0eb260da9719836dbc Mon Sep 17 00:00:00 2001
From: maxnyby <maxhlarsen@gmail.com>
Date: Sun, 16 Jun 2013 22:01:13 +0300
Subject: [PATCH] Updated contrast to make arguments 2 and 3 optional.

---
 lessc.inc.php | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/lessc.inc.php b/lessc.inc.php
index 5c81ad2a..48c9bc8f 100644
--- a/lessc.inc.php
+++ b/lessc.inc.php
@@ -1056,12 +1056,28 @@ protected function lib_mix($args) {
 	}
 
 	protected function lib_contrast($args) {
-		if ($args[0] != 'list' || count($args[2]) < 3) {
+		if($args[0] == 'color') {
+			$args = array(
+				'list',
+				',',
+				array(
+					$args,
+					array('color',0,0,0),
+					array('color',255,255,255)
+				)
+			);
+		}
+
+		if ($args[0] != 'list' || count($args[2]) < 1) {
 			return array(array('color', 0, 0, 0), 0);
 		}
 
 		list($inputColor, $darkColor, $lightColor) = $args[2];
 
+		$darkColor = $darkColor ? $darkColor : array('color', 0, 0, 0);
+		$lightColor = $lightColor ? $lightColor : array('color', 255, 255, 255);
+
+
 		$inputColor = $this->assertColor($inputColor);
 		$darkColor = $this->assertColor($darkColor);
 		$lightColor = $this->assertColor($lightColor);