D port of docopt

[Bob Tolbert via Digitalmars-d-announce]

On Monday, 16 June 2014 at 17:59:13 UTC, Sönke Ludwig wrote:
> Am 15.06.2014 19:35, schrieb Bob Tolbert:

>
> One thing that would be nice is support for multiple help 
> screens (e.g. one per command). For DUB [1] (or GIT) for 
> example there is one main help screen that lists all commands 
> along with common options and then one help screen per command 
> that lists the individual arguments, options and a summary of 
> what the command does. But maybe for such more complex CLIs it 
> starts to be more efficient to use a programmatic approach.
>

if you have a look at the gitD examples, they do just this. If 
you do

     gitD --help

you get the general help for gitD, but if you do

     gitD push -h
or
     gitD help push

you get the help for the sub-command "push"

so doing this with 'dub' would be pretty simple.

And you don't have to use external sub-commands either. You can 
parse the basic args with the general doc string and then based 
on the sub-command chosen, re-parse with the options specific to 
that sub module.

I haven't looked at the dub source code, but I'd be happy to help 
sketch out how this might work there specifically.

Bob