-o - --sort=no => ok
--sort=no => ok
 => ok
-o - => ok
-e -o - --sort=no => ok
-e --sort=no => ok
-e => ok
-e -o - => ok
-x -o - --sort=no => ok
-x -o tags-x --sort=no => ok
-x -o tags-x => ok
-x -o - => ok
