improve error reporting, include filename

bin/lessc

@@ -39,13 +39,14 @@ if (! input) {
 
 fs.stat(input, function (e, stats) {
     if (e) {
-        sys.puts("lessc: " + e.message + ": '" + input + "'\n");
+        sys.puts("lessc: " + e.message);
         process.exit(1);
     }
     fs.open(input, process.O_RDONLY, stats.mode, function (e, fd) {
         fs.read(fd, stats.size, 0, "utf8", function (e, data) {
             new(less.Parser)({
-                paths: [path.dirname(input)]
+                paths: [path.dirname(input)],
+                filename: input
             }).parse(data, function (err, tree) {
                 if (err) {
                     less.writeError(err);

lib/less/index.js

@@ -52,7 +52,8 @@ var less = {
         }
         error = error.join('\n') + '\033[0m\n';
 
-        require('sys').puts(stylize(ctx.message, 'red'), error);
+        require('sys').puts(stylize(ctx.message + ' of ', 'red') +
+                            ctx.filename + ': ', error);
     }
 };
 
@@ -91,9 +92,10 @@ less.Parser.importer = function (file, paths, callback) {
                     if (e) sys.puts(e);
 
                     new(less.Parser)({
-                        paths: [path.dirname(pathname)]
+                        paths: [path.dirname(pathname)],
+                        filename: pathname
                     }).parse(data, function (e, root) {
-                        if (e) sys.puts(e);
+                        if (e) less.writeError(e);
                         callback(root);
                     });
                 });

lib/less/parser.js

@@ -227,7 +227,8 @@ less.Parser = function Parser(env) {
 
                 error = {
                     name: "ParseError",
-                    message: "Syntax Error on line " + line + ":",
+                    message: "Syntax Error on line " + line,
+                    filename: env.filename,
                     line: line,
                     column: column,
                     extract: [