From: Martin Willensdorfer <ma.wi@gmx.at>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] 'Pass on' argument from Arg.parse to Arg.parse_argv
Date: Sat, 22 Jan 2005 11:29:44 -0500 [thread overview]
Message-ID: <200501221129.45092.ma.wi@gmx.at> (raw)
In-Reply-To: <200501221105.27087.jon@jdh30.plus.com>
> > Is there a way to do this? I'd like Arg.parse to ignore unknown args.
I don't know if that helps you, but I had a similar situation. I also wanted
to "reused" command line arguments. However, I could cramp everything into
one module (config.ml). Below is an example showing you how I did it.
config_1 uses its own flags and the flags defined in config_0. I am sure you
can do something similar by replacing my config_0 with whatever you have in
your StdArg module.
Other than that, is there a way to use the things defined for Arg.parse to
read values from a file when the flag '-prm_file <filename>' is used. My list
of command line arguments gets bigger and bigger and I would like to be able
to use parameter files (for reproducibility and convenience) and to reuse the
code written for command-line arguments.
Best wishes,
Martin
------------------------------------------------------ config.ml :
type config_0 = {
a : float;
}
type config_1 = {
prm_config_0 : config_0 ref;
dimx : int;
}
let default_config_0 = {
a = 300.;
}
let default_config_1 = {
prm_config_0 = ref default_config_0;
dimx = 10;
}
(* prm for config_0 *)
let set_a cf value = cf := {!cf with a = value};;
(* prm for config_1 *)
let set_dimx cf value = cf := {!cf with dimx = value};;
let speclist_config_0 cf =
[("-a", Arg.Float (set_a cf) , "commend")]
let speclist_config_1 cf =
[("-dimx", Arg.Int (set_dimx cf) , "x") ]@
(speclist_config_0 !cf.prm_config_0)
let get_config_0_prm cf label =
match label with
| "a" -> Float cf.a
| _ -> failwith ("get_config_0_prm: cannot find "^label^" in config")
let get_config_1_prm cf label =
match label with
| "dimx" -> Int cf.dimx
| _ -> try get_config_0_prm !(cf.prm_config_0) label with
Failure message -> failwith ("get_config_0_prm: "^message)
------------------------------------------------------ usage :
let read_args () =
let cf = ref Config.default_config_1 in
let speclist = Config.speclist_config_1 cf in
let usage_msg = "whatever" in
Arg.parse speclist (fun s -> ()) usage_msg; !cf;;
On Saturday 22 January 2005 06:05, Jon Harrop wrote:
> On Friday 21 January 2005 16:48, Richard Jones wrote:
> > ...
> > but this unfortunately doesn't work, because the program doesn't get
> > beyond the StdArg call to Arg.parse before printing this error message
> > and exiting:
> >
> > ./prog: unknown option `--foobar'.
> > [followed by usage message]
> >
> > Is there a way to do this? I'd like Arg.parse to ignore unknown args.
>
> What about providing your StdArg module with a way to let you register new
> arguments and either let you specify how they will be parsed or parse them
> separately afterwards?
>
> Cheers,
> Jon.
>
> _______________________________________________
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prev parent reply other threads:[~2005-01-22 16:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-21 16:48 Richard Jones
2005-01-22 11:05 ` [Caml-list] " Jon Harrop
2005-01-22 16:29 ` Martin Willensdorfer [this message]
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