get the map file outputting and reference file from the end of the css file

bin/lessc

@@ -139,7 +139,9 @@ args = args.filter(function (arg) {
             }
             break;
         case 'source-map':
-            if (checkArgFunc(arg, match[2])) {
+            if (!match[2]) {
+                options.sourceMap = true;
+            } else {
                 options.sourceMap = match[2];
             }
             break;
@@ -186,6 +188,14 @@ if (output) {
     }
 }
 
+if (options.sourceMap === true) {
+    if (!output) {
+        sys.puts("the sourcemap option only has an optional filename if the css filename is given");
+        return;
+    }
+    options.sourceMap = output + ".map";
+}
+
 if (! input) {
     sys.puts("lessc: no input files");
     sys.puts("");
@@ -250,7 +260,8 @@ var parseLessFile = function (e, data) {
                     ieCompat: options.ieCompat,
                     compress: options.compress,
                     cleancss: options.cleancss,
-                    sourceMap: options.sourceMap,
+                    sourceMap: Boolean(options.sourceMap),
+                    sourceMapFilename: options.sourceMap,
                     writeSourceMap: writeSourceMap,
                     maxLineLen: options.maxLineLen,
                     strictMath: options.strictMath,

lib/less/lessc_helper.js

@@ -51,7 +51,7 @@ var lessc_helper = {
         sys.puts("                          that will output the information within a fake");
         sys.puts("                          media query which is compatible with the SASS");
         sys.puts("                          format, and 'all' which will do both.");
-        sys.puts("  --source-map=FILENAME   Outputs a sourcemap to the filename.");
+        sys.puts("  --source-map[=FILENAME] Outputs a v3 sourcemap to the filename (or output filename.map)");
         sys.puts("  -rp, --rootpath=URL     Set rootpath for url rewriting in relative imports and urls.");
         sys.puts("                          Works with or without the relative-urls option.");
         sys.puts("  -ru, --relative-urls    re-write relative urls to the base less file.");

lib/less/parser.js

@@ -472,7 +472,8 @@ less.Parser = function Parser(env) {
                                 {
                                     writeSourceMap: options.writeSourceMap,
                                     rootNode: evaldRoot,
-                                    contentsMap: parser.imports.contents
+                                    contentsMap: parser.imports.contents,
+                                    sourceMapFilename: options.sourceMapFilename
                                 });
                         }
 

lib/less/source-map-output.js

@@ -6,6 +6,7 @@
         this._rootNode = options.rootNode;
         this._writeSourceMap = options.writeSourceMap;
         this._contentsMap = options.contentsMap;
+        this._sourceMapFilename = options.sourceMapFilename;
 
         this._lineNumber = 0;
         this._column = 0;
@@ -50,6 +51,10 @@
 
         this._writeSourceMap(JSON.stringify(this._sourceMapGenerator.toJSON()));
 
+        if (this._sourceMapFilename) {
+            this._css.push("/*# sourceMappingURL=" + this._sourceMapFilename + " */");
+        }
+
         return this._css.join('');
     };
 

test/less-test.js

@@ -58,7 +58,7 @@ function getErrorPathReplacementFunction(dir) {
 }
 
 function testSourcemap(name, err, compiledLess, doReplacements, sourcemap) {
-    fs.readFile(path.join('test/sourcemaps', name) + '.json', 'utf8', function (e, expectedSourcemap) {
+    fs.readFile(path.join('test/', name) + '.json', 'utf8', function (e, expectedSourcemap) {
         sys.print("- " + name + ": ");
         if (sourcemap === expectedSourcemap) {
             ok('OK');