forever.stat append flag

lib/forever.js

@@ -76,17 +76,31 @@ forever.load();
 //
 // ### function stat (logFile, script, callback)
 // #### @logFile {string} Path to the log file for this script
+// #### @logAppend {boolean} Optional. True Prevent failure if the log file exists.
 // #### @script {string} Path to the target script.
 // #### @callback {function} Continuation to pass control back to 
 // Ensures that the logFile doesn't exist and that
 // the target script does exist before executing callback.
 //
 forever.stat = function (logFile, script, callback) {
-  fs.stat(logFile, function (err, stats) {
-    if (!err) return callback(new Error('log file ' + logFile + ' exists.'));
-    fs.stat(script, function (err, stats) {
-      if (err) return callback(new Error('script ' + script + ' does not exist.'));
-      callback(null);
+  var logAppend,
+      realCallback = callback;
+  if (arguments.length === 4) {
+    logAppend = callback;
+    realCallback = arguments[3];
+  }
+
+  fs.stat(script, function (err, stats) {
+    if (err) return realCallback(new Error('script ' + script + ' does not exist.'));
+
+    if (logAppend) {
+      realCallback(null);
+      return;
+    }
+
+    fs.stat(logFile, function (err, stats) {
+      if (!err) return realCallback(new Error('log file ' + logFile + ' exists.'));
+      realCallback(null);
     });
   });
 };