make debugging css easier

node_modules/architect-build/build.js

@@ -45,7 +45,7 @@ function build(config, opts, callback){
     if (!opts.noArchitect) {
         mains.push("lib/architect/architect");
         (opts.ignore || (opts.ignore = [])).push(
-            //path.resolve(__dirname + "/../architect/events"),
+            // path.resolve(__dirname + "/../architect/events"),
             path.resolve(__dirname + "/../architect/path"),
             path.resolve(__dirname + "/../architect/fs")
         );
@@ -197,7 +197,8 @@ function compileLess(opts, sources, callback) {
         compileLessFragment(file.code, opts.lessLibs, root, plugin.staticPrefix, file.path, opts.compress, function(err, css) {
             if (err)
                 return callback(err);
-            
+            if (css)
+                css += "\n/*# sourceURL=css/" + file.pkg.id.substr(5) + " */";
             if (cacheKey)
                 cache.less[cacheKey] = css;
             code.push(css);
@@ -206,6 +207,7 @@ function compileLess(opts, sources, callback) {
     }, function(err) {
         if (opts.lessLibs.css) {
             code.push(opts.lessLibs.css);
+            code.push("\n/*# sourceURL=css/libs */");
         }
         callback(err, {
             code: code.join("\n")