fix error message when no filename, also try to print stack

bin/lessc

@@ -24,6 +24,9 @@ args = args.filter(function (arg) {
         case 'version':
             sys.puts("lessc " + less.version.join('.') + " (LESS Compiler) [JavaScript]");
             process.exit(0);
+        case 'verbose':
+            options.verbose = true;
+            break;
         case 'h':
         case 'help':
             sys.puts("usage: lessc source [destination]");

lib/less/index.js

@@ -36,11 +36,12 @@ var less = {
         }
     },
     writeError: function (ctx) {
+        var message = "";
         var extract = ctx.extract;
         var error = [];
 
-        if (ctx.stack) {
-            return require('sys').error(ctx.stack);
+        if (!ctx.index && ctx.stack) {
+            return sys.error(ctx.stack);
         }
 
         if (typeof(extract[0]) === 'string') {
@@ -56,8 +57,12 @@ var less = {
         }
         error = error.join('\n') + '\033[0m\n';
 
-        require('sys').error(stylize(ctx.message + ' of ', 'red') +
-                             ctx.filename + ': ', error);
+        message += stylize(ctx.message, 'red');
+        ctx.filename && (message += stylize(' in ', 'red') + ctx.filename);
+
+        sys.error(message, error);
+
+        if (ctx.verbose && ctx.stack) { sys.error(stylize(ctx.stack, 'red')) }
     }
 };
 

lib/less/parser.js

@@ -238,9 +238,11 @@ less.Parser = function Parser(env) {
                         throw {
                             name: "NameError",
                             message: e.message,
+                            filename: env.filename,
                             line: line,
                             stack: e.stack,
                             column: column,
+                            verbose: env.verbose,
                             extract: [
                                 lines[line - 2],
                                 lines[line - 1],