1 files changed, 23 insertions, 0 deletions
diff --git a/app/services/file_service.rb b/app/services/file_service.rb
new file mode 100644
index 000000000..efccbe24f
--- /dev/null
+++ b/app/services/file_service.rb
@@ -0,0 +1,23 @@
+module FileService extend self
+
+  def unique_filename( path, enum_with: with_ints )
+    file_names = enum_with.map( &file_name_maker(path) )
+    file_names
+      .drop_while( &File.method(:exists?) )
+      .next
+  end
+
+  def with_ints(format='%d')
+    (0..Float::INFINITY)
+      .lazy
+      .map{ |n| format % n }
+  end
+  
+
+  private
+
+  def file_name_maker path
+    ->(n){ [path, n].join('_') }
+  end
+
+end