Add a lint option to lessc

bin/lessc

@@ -12,6 +12,7 @@ var options = {
     yuicompress: false,
     optimization: 1,
     silent: false,
+    lint: false,
     paths: [],
     color: true,
     strictImports: false,
@@ -48,6 +49,10 @@ args = args.filter(function (arg) {
         case 'silent':
             options.silent = true;
             break;
+        case 'l':
+        case 'lint':
+            options.lint = true;
+            break;
         case 'strict-imports':
             options.strictImports = true;
             break;
@@ -149,7 +154,7 @@ var parseLessFile = function (e, data) {
             less.writeError(err, options);
             currentErrorcode = 1;
             return;
-        } else {
+        } else if(!options.lint) {
             try {
                 var css = tree.toCSS({
                     compress: options.compress,

lib/less/lessc_helper.js

@@ -31,6 +31,7 @@ var lessc_helper = {
         sys.puts("  -h, --help              Print help (this message) and exit.");
         sys.puts("  --include-path          Set include paths. Separated by `:'. Use `;' on Windows.");
         sys.puts("  --no-color              Disable colorized output.");
+        sys.puts("  -l, --lint              Syntax check only (lint).");
         sys.puts("  -s, --silent            Suppress output of error messages.");
         sys.puts("  --strict-imports        Force evaluation of imports.");
         sys.puts("  --verbose               Be verbose.");