Re: [gentoo-portage-dev] [PATCH] Support USE_EXPAND prefixes in package.use and relevant files

[Zac Medico <zmedico@gentoo.org>]

On 01/20/2015 03:18 AM, Michał Górny wrote:
> Support prefixing groups of USE_EXPAND flags with 'USE_EXPAND:' in user
> configuration package.use and similar files. This provides a convenient
> way of declaring specifying multiple USE_EXPAND flags and matches the
> syntax supported by Paludis. Example:
> 
>   dev-util/netbeans NETBEANS_MODULES: php webcommon extide
>   media-libs/mesa osmesa VIDEO_CARDS: intel nouveau
> ---
>  pym/portage/package/ebuild/_config/UseManager.py | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/pym/portage/package/ebuild/_config/UseManager.py b/pym/portage/package/ebuild/_config/UseManager.py
> index 3a4ec22..59f474e 100644
> --- a/pym/portage/package/ebuild/_config/UseManager.py
> +++ b/pym/portage/package/ebuild/_config/UseManager.py
> @@ -202,10 +202,17 @@ class UseManager(object):
>  		useflag_re = _get_useflag_re(eapi)
>  		for k, v in file_dict.items():
>  			useflags = []
> +			use_expand_prefix = ''
>  			for prefixed_useflag in v:
> +				if extended_syntax and prefixed_useflag[-1] == ":":
> +					use_expand_prefix = prefixed_useflag[:-1].lower() + "_"
> +					continue
> +
>  				if prefixed_useflag[:1] == "-":
>  					useflag = prefixed_useflag[1:]
> +					prefixed_useflag = "-" + use_expand_prefix + useflag
>  				else:
> +					prefixed_useflag = use_expand_prefix + prefixed_useflag
>  					useflag = prefixed_useflag
>  				if useflag_re.match(useflag) is None:
>  					writemsg(_("--- Invalid USE flag for '%s' in '%s': '%s'\n") %

We could match useflag_re against (use_expand_prefix + useflag) here, so
that the use_expand_prefix is also validated. Otherwise, the patch looks
good.
-- 
Thanks,
Zac