62 lines
1.6 KiB
OCaml
62 lines
1.6 KiB
OCaml
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type spec =
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String of (string -> unit)
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| Int of (int -> unit)
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| Unit of (unit -> unit)
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| Float of (float -> unit)
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exception Bad of string
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type error =
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Unknown of string
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| Wrong of string * string * string (* option, actual, expected *)
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| Missing of string
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| Message of string
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open Printf
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let stop error =
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let progname =
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if Array.length Sys.argv > 0 then Sys.argv.(0) else "(?)" in
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begin match error with
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Unknown s ->
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eprintf "%s: unknown option `%s'.\n" progname s
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| Missing s ->
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eprintf "%s: option `%s' needs an argument.\n" progname s
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| Wrong (opt, arg, expected) ->
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eprintf "%s: wrong argument `%s'; option `%s' expects %s.\n"
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progname arg opt expected
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| Message s ->
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eprintf "%s: %s.\n" progname s
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end;
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exit 2
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let parse speclist anonfun =
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let rec p = function
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[] -> ()
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| s :: t ->
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if String.length s >= 1 & String.get s 0 = '-'
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then do_key s t
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else begin try (anonfun s); p t with Bad m -> stop (Message m) end
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and do_key s l =
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let action =
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try
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List.assoc s speclist
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with Not_found ->
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stop (Unknown s) in
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try
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match (action, l) with
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(Unit f, l) -> f (); p l
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| (String f, arg::t) -> f arg; p t
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| (Int f, arg::t) ->
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begin try f (int_of_string arg)
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with Failure "int_of_string" -> stop (Wrong (s, arg, "an integer"))
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end;
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p t
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| (Float f, arg::t) -> f (float_of_string arg); p t
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| (_, []) -> stop (Missing s)
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with Bad m -> stop (Message m)
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in
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match Array.to_list Sys.argv with
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[] -> ()
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