Convert the song only if necessary

patacrep/songs/convert/__main__.py

@@ -57,12 +57,12 @@ if __name__ == "__main__":
     for file in song_files:
         song = song_parsers[source]("", file, DEFAULT_CONFIG)
         try:
-            converted = song.render(dest)
             destname = "{}.{}".format(".".join(file.split(".")[:-1]), dest)
             if os.path.exists(destname) and not remember:
                 overwrite, remember = confirm(destname)
             if not overwrite:
                 continue
+            converted = song.render(dest)
             with open(destname, "w") as destfile:
                 destfile.write(converted)