-val parse_cmdline : unit -> unit
-val index_empty_texts : bool ref
-val sample_factor : int ref
-val disable_text_collection : bool ref
-val count_only : bool ref
-val query : string ref
-val input_file : string ref
-val output_file : string option ref
-val save_file : string ref
-val time : bool ref
-val tc_threshold : int ref
-val backward : bool ref