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clap's Issues

Should Clap support environment variables?

In some similar libraries, one can specify environment variables from which the value of some command-line arguments can be read if those arguments are not specified (or in addition?).

This seems rather straightforward to implement and could thus be useful.

Should different arguments with the same name result in an error?

Currently, defining multiple arguments with the same name is allowed. Once the first is consumed, the second can be consumed, which makes sense with the semantics of Clap. However, in practice it's usually a mistake.

One could add ?check_duplicates to Clap.close, defaulting to true, that would go through the list of registered arguments and check that there are no duplicates.

`dune-project` is missing

I'm trying to install the latest version of Clap pinned to git master: opam pin add --dev-repo clap.

Currently, this is not possible, because dune-project file is missing and explicitly added to .gitignore.

So I get the following error:

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>
[clap.0.1.0] no changes from git+https://github.com/rbardou/clap.git
 
The following actions will be performed:
  ∗ install clap 0.1.0*
[clap.0.1.0] synchronised from git+https://github.com/rbardou/clap.git
 
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The compilation of clap failed at "C:\\OCaml64\\home\\jbz\\.opam\\4.11.1+mingw64c\\bin\\dune.exe subst".
 
#=== ERROR while compiling clap.0.1.0 =========================================#
# context     2.0.7 | win32/x86_64 | ocaml-variants.4.11.1+mingw64c | pinned(git+https://github.com/rbardou/clap.git#064ca69f)
# path        ~/.opam/4.11.1+mingw64c/.opam-switch/build/clap.0.1.0
# command     C:\OCaml64\home\jbz\.opam\4.11.1+mingw64c\bin\dune.exe subst
# exit-code   1
# env-file    ~/.opam/log/clap-10764-e7966f.env
# output-file ~/.opam/log/clap-10764-e7966f.out
### output ###
# Error: dune-project: No such file or directory
 
 
 
<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build clap 0.1.0
└─
╶─ No changes have been performed

Could you please add a dune-project file to git?

It would be enough to have something simple like:

(lang dune 2.9)
(name clap)

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