1 files changed, 17 insertions, 1 deletions
diff --git a/lib/output/folder.js b/lib/output/folder.js
index aabdcc4..8b899f6 100644
--- a/lib/output/folder.js
+++ b/lib/output/folder.js
@@ -34,7 +34,7 @@ FolderOutput.prototype.prepare = function() {
 // ----- Utility methods -----
 
 // Return path to the root folder
-FolderOutput.prototype.root = function(filename) {
+FolderOutput.prototype.root = function() {
     return path.resolve(process.cwd(), this.book.config.get('output'));
 };
 
@@ -74,10 +74,26 @@ FolderOutput.prototype.writeFile = function(filename, buf) {
     });
 };
 
+// Return true if a file exists in the output folder
+FolderOutput.prototype.hasFile = function(filename) {
+    var that = this;
+
+    return Promise()
+    .then(function() {
+        return fs.exists(that.resolve(filename));
+    });
+};
+
+
 // Create a new unique file
 // Returns its filename
 FolderOutput.prototype.createNewFile = function(base, filename) {
+    if (!filename) {
+        filename = path.basename(filename);
+        base = path.dirname(base);
+    }
 
+    return fs.uniqueFilename(this.resolve(base), filename);
 };