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(*
Copyright 2008,2010,2011 by Mark Weyer
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
open Arg
let speclist = ref []
let parse usage =
let anon = ref [] in
parse (List.rev !speclist) (fun s -> anon := !anon @ [s]) usage;
!anon
let usage usage_ = usage (List.rev !speclist) usage_
let register_ref key doc (f : string -> 'a -> 'a) (start : 'a) =
let res = ref start in
speclist := (key, String (fun s -> res := f s !res), doc) :: !speclist;
res
let register_ref_ignore key doc f =
register_ref key doc (fun s -> fun _ -> f s)
let register_choices values =
let res = ref None in
speclist := (List.map
(fun (key,doc) -> (key, Unit (fun () -> res := Some key), doc))
values) @ !speclist;
res
module type Parsable = sig type t val from_string : string -> t end
module String = struct type t=string let from_string s = s end
module Int = struct
type t=int
let from_string s =
try int_of_string s
with Failure "int_of_string" -> raise (Bad "")
end
module Register (T : Parsable) = struct
let register_without_default key doc =
register_ref_ignore key doc (fun s -> Some (T.from_string s)) None
let register_with_default key doc default =
register_ref_ignore key doc T.from_string default
let register_list key doc =
register_ref key doc (fun s -> fun tail -> (T.from_string s) :: tail) []
end
module Register_String = Register(String)
module Register_Int = Register(Int)
let register_int_without_default = Register_Int.register_without_default
let register_string_with_default = Register_String.register_with_default
let register_string_without_default = Register_String.register_without_default
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