[TIP] tox "empty" factors for generated environment?

[holger krekel]

On Sun, Jan 31, 2016 at 12:55 -0500, Barry Warsaw wrote:
> On Jan 31, 2016, at 08:09 AM, holger krekel wrote:
> 
> >What about today's possible ...
> >
> >     envlist = {py34,py35}{,-coverage}{,-pg}
> 
> Yes!  That's exactly what I was (poorly) asking for.
> 
> >?  I guess it'd be nicer to make {py34,py35}-{,coverage}-{,pg} work as well.
> 
> Perhaps, but not necessary.  I'm not sure the {,-factor} syntax is documented,
> or if it is I've missed it.  So maybe it just needs to be documented more
> visibly in the tox documentation?
> 
> Then I think you're right that the only new thing we need is a way to describe
> empty factors in the sections.  E.g. now I have:
> 
> [tox]
> envlist = {py34,py35}{,-coverage}{,-pg}
> 
> [testenv]
> commands =
>     python -m nose2 -v
>     coverage: python -m coverage run {[coverage]rc} -m nose2 -v
>     coverage: python -m coverage combine {[coverage]rc}
>     coverage: python -m coverage html {[coverage]rc}
>     coverage: python -m coverage report -m {[coverage]rc}
> 
> but that means that when I run -e py35-coverage, it runs the first command
> unnecessarily.  With your proposal I could write:
> 
> [testenv]
> commands =
>     !: python -m nose2 -v
>     coverage: python -m coverage run {[coverage]rc} -m nose2 -v
>     coverage: python -m coverage combine {[coverage]rc}
>     coverage: python -m coverage html {[coverage]rc}
>     coverage: python -m coverage report -m {[coverage]rc}
> 
> and I think that would cover my use case nicely.

However, it would be:

   !coverage: python -m nose2 -v

as a single "!" sign would not have much meaning.

holger


> Add issue #223 (default envlists and/or env groups) and I'd be a very happy
> camper. :)
> 
> Cheers,
> -Barry



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