From e70fcc38638f1699edeac4902a3667719d5cef20 Mon Sep 17 00:00:00 2001
From: Vinay Pulim <v@pulim.com>
Date: Tue, 7 Feb 2012 14:14:03 -0500
Subject: [PATCH] added support for "-" prefix in DEBUG

---
 lib/debug.js | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/lib/debug.js b/lib/debug.js
index 740ebb8..1be8b66 100644
--- a/lib/debug.js
+++ b/lib/debug.js
@@ -27,11 +27,19 @@ exports.version = '0.5.0';
  * Enabled debuggers.
  */
 
-var names = (process.env.DEBUG || '')
+var names = [],
+    skips = [];
+
+(process.env.DEBUG || '')
   .split(/[\s,]+/)
-  .map(function(name){
+  .forEach(function(name){
     name = name.replace('*', '.*?');
-    return new RegExp('^' + name + '$');
+    if (name[0] === '-') {
+      skips.push(new RegExp('^' + name.substr(1) + '$'));
+    }
+    else {
+      names.push(new RegExp('^' + name + '$'));
+    }
   });
 
 /**
@@ -97,7 +105,13 @@ function humanize(ms) {
  */
 
 function debug(name) {
-  var match = names.some(function(re){
+  var match = skips.some(function(re){
+    return re.test(name);
+  });
+
+  if (match) return function(){};
+
+  match = names.some(function(re){
     return re.test(name);
   });