From 855eca1d93caa231374096444322b21e8b86b4ba Mon Sep 17 00:00:00 2001
From: Kevin Attfield <k.attfield@gmail.com>
Date: Tue, 29 Oct 2013 11:12:50 -0700
Subject: [PATCH] added sourceMappingURL option

---
 bin/lessc                     |  1 +
 lib/less/parser.js            |  1 +
 lib/less/source-map-output.js | 10 ++++++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/bin/lessc b/bin/lessc
index 94c5dd61..41e1e8e3 100755
--- a/bin/lessc
+++ b/bin/lessc
@@ -318,6 +318,7 @@ var parseLessFile = function (e, data) {
                     cleancss: options.cleancss,
                     sourceMap: Boolean(options.sourceMap),
                     sourceMapFilename: options.sourceMap,
+                    sourceMappingURL: options.sourceMappingURL,
                     sourceMapOutputFilename: options.sourceMapOutputFilename,
                     sourceMapBasepath: options.sourceMapBasepath,
                     sourceMapRootpath: options.sourceMapRootpath || "",
diff --git a/lib/less/parser.js b/lib/less/parser.js
index 090e305f..244eead7 100644
--- a/lib/less/parser.js
+++ b/lib/less/parser.js
@@ -469,6 +469,7 @@ less.Parser = function Parser(env) {
                                     rootNode: evaldRoot,
                                     contentsMap: parser.imports.contents,
                                     sourceMapFilename: options.sourceMapFilename,
+                                    sourceMappingURL: options.sourceMappingURL,
                                     outputFilename: options.sourceMapOutputFilename,
                                     sourceMapBasepath: options.sourceMapBasepath,
                                     sourceMapRootpath: options.sourceMapRootpath,
diff --git a/lib/less/source-map-output.js b/lib/less/source-map-output.js
index b3e142bf..f56035c8 100644
--- a/lib/less/source-map-output.js
+++ b/lib/less/source-map-output.js
@@ -7,6 +7,7 @@
         this._contentsMap = options.contentsMap;
         this._sourceMapFilename = options.sourceMapFilename;
         this._outputFilename = options.outputFilename;
+        this._sourceMappingURL = options.sourceMappingURL;
         this._sourceMapBasepath = options.sourceMapBasepath;
         this._sourceMapRootpath = options.sourceMapRootpath;
         this._outputSourceFiles = options.outputSourceFiles;
@@ -93,6 +94,7 @@
 
         if (this._css.length > 0) {
             var sourceMapFilename,
+                sourceMappingURL,
                 sourceMapContent = JSON.stringify(this._sourceMapGenerator.toJSON());
 
             if (this._sourceMapFilename) {
@@ -105,8 +107,12 @@
                 sourceMapFilename = "data:application/json," + encodeURIComponent(sourceMapContent);
             }
 
-            if (sourceMapFilename) {
-                this._css.push("/*# sourceMappingURL=" + sourceMapFilename + " */");
+            if (this._sourceMappingURL) {
+                sourceMappingURL = this.normalizeFilename(this._sourceMappingURL);
+            }
+
+            if (sourceMappingURL || sourceMapFilename) {
+                this._css.push("/*# sourceMappingURL=" + sourceMappingURL || sourceMapFilename + " */");
             }
         }