let index_empty_texts = ref false
let sample_factor = ref 64
let disable_text_collection = ref false

let query = ref ""
let input_file = ref ""
let output_file = ref None


let usage_msg = Printf.sprintf "%s <input.xml> 'query' [output]" Sys.argv.(0)

let anon_fun = let pos = ref 0 in
  fun s -> match !pos with
    | 0 -> input_file:= s;incr pos
    | 1 -> query := s; incr pos
    | 2 -> output_file := Some s; incr pos
    | _ -> raise (Arg.Bad(s))

let spec = [ "-f", Arg.Set_int(sample_factor),"sample factor [default=64]";
	     "-i", Arg.Set(index_empty_texts),"index empty texts [default=false]";
	     "-d", Arg.Set(disable_text_collection),"Disable text collection[default=false]"; ]

let parse_cmdline() = Arg.parse spec anon_fun usage_msg