--- a/main.lua	Tue Sep 11 23:51:37 2018 +0100
+++ b/main.lua	Wed Sep 12 10:56:51 2018 +0100
@@ -92,7 +92,7 @@
 			end
 			local path = assert(get_value(), "path expected for '-d'"):gsub("/*$", "");
 			for f in lfs.dir(path) do
-				if f:sub(1,1) ~= "." then
+				if f:sub(1,1) ~= "." and f:sub(-4) == ".scs" then
 					table.insert(files, path.."/"..f);
 				end
 			end