[Caml-list] [RFC] new OPAM command-line interface

[Thomas Gazagnaire <thomas@ocamlpro.com>]

Hi,

In order to prepare the beta release of OPAM (which should hopefully be announced at the end of next week if everything goes well), I've been working on improving its command-line interface (which is currently a bit had-hoc). Thanks to the great Daniel Bunzli's cmdliner[1] library, I now have a nice -- but incompatible -- command-line interface in the 'cmdliner' branch[2].

The main changes are:
* an uniform help interface, where all flags and parameters are correctly documents
* no more -long-option, only -s or --long
* 'opam remote' is still there for convenience but will be deprecated; use 'opam repository' instead
* use of sub-sub-commands when necessary (ie. 'opam repository add')
* use non-ambiguous prefix of sub-command instead of the subcommand (ie. 'opam repo' or 'opam rem')
* AND: a nice 'opam --help' and 'opam <subcommand> --help' output

I'm quite keen to get community feedback on this new command-line. Feel free to comment here, or to to use the issue tracker[3].

Cheers,
Thomas

[1] http://erratique.ch/software/cmdliner
[2] git clone -b cmdliner git://github.com/OCamlPro/opam.git
[3] https://github.com/OCamlPro/opam/issues/157