remove process.exit calls as they do not guarentee a flushed stdout

bin/lessc

@@ -16,6 +16,12 @@ var options = {
     color: true,
     strictImports: false
 };
+var continueProcessing = true,
+    currentErrorcode;
+
+// calling process.exit does not flush stdout always
+// so use this to set the exit code
+process.on('exit', function() { process.reallyExit(currentErrorcode) });
 
 args = args.filter(function (arg) {
     var match;
@@ -32,7 +38,7 @@ args = args.filter(function (arg) {
         case 'v':
         case 'version':
             sys.puts("lessc " + less.version.join('.') + " (LESS Compiler) [JavaScript]");
-            process.exit(0);
+            continueProcessing = false;
         case 'verbose':
             options.verbose = true;
             break;
@@ -46,7 +52,7 @@ args = args.filter(function (arg) {
         case 'h':
         case 'help':
             require('../lib/less/lessc_helper').printUsage();
-            process.exit(0);
+            continueProcessing = false;
         case 'x':
         case 'compress':
             options.compress = true;
@@ -61,7 +67,7 @@ args = args.filter(function (arg) {
             options.paths = match[2].split(os.type().match(/Windows/) ? ';' : ':')
                 .map(function(p) {
                     if (p) {
-                      return path.resolve(process.cwd(), p);
+                        return path.resolve(process.cwd(), p);
                     }
                 });
             break;
@@ -71,6 +77,10 @@ args = args.filter(function (arg) {
     }
 });
 
+if (!continueProcessing) {
+    return;
+}
+
 var input = args[1];
 if (input && input != '-') {
     input = path.resolve(process.cwd(), input);
@@ -80,17 +90,21 @@ if (output) {
     output = path.resolve(process.cwd(), output);
 }
 
-var css, fd, tree;
-
 if (! input) {
     sys.puts("lessc: no input files");
-    process.exit(1);
+    sys.puts("");
+    require('../lib/less/lessc_helper').printUsage();
+    currentErrorcode = 1;
+    return;
 }
 
+var css, fd, tree;
+
 var parseLessFile = function (e, data) {
     if (e) {
         sys.puts("lessc: " + e.message);
-        process.exit(1);
+        currentErrorcode = 1;
+        return;
     }
 
     new(less.Parser)({
@@ -101,7 +115,8 @@ var parseLessFile = function (e, data) {
     }).parse(data, function (err, tree) {
         if (err) {
             less.writeError(err, options);
-            process.exit(1);
+            currentErrorcode = 1;
+            return;
         } else {
             try {
                 css = tree.toCSS({
@@ -117,7 +132,8 @@ var parseLessFile = function (e, data) {
                 }
             } catch (e) {
                 less.writeError(e, options);
-                process.exit(2);
+                currentErrorcode = 2;
+                return;
             }
         }
     });