Re: [gentoo-dev] Dirt: To shove under the rug or not shove under the rug? (aka another round of USE_EXPAND)

[Donnie Berkholz <spyderous@gentoo.org>]

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Jason Stubbs wrote:
| What are the exact reasons for not wanting to put the expanded flags
directly
| into IUSE? If it's just a matter of the horrid display existing tools
would
| give, the functionality can go in and IUSE updated after the functional
| versions are stabled. Are there any reasons beyond that?

It's useful to group things logically like this. You don't need to worry
about forgetting to add in variables like:

IUSE_VIDEO_CARDS="foo bar"
IUSE="${IUSE_VIDEO_CARDS} baz bop"

Particularly when you start doing things in eclasses as well as ebuilds,
this gets worrisome. It's also more aesthetically pleasing. And it
creates a logical parallel with the user-set variables in make.conf.

In addition, it saves IUSE from having super-long flags:

IUSE="video_cards_foo video_cards_bar video_cards_baz ... " -- picture
that repeated 10 times. It's just plain ugly and overly long.

Most importantly IMHO, it suggests that users should set
USE="video_cards_foo" instead of VIDEO_CARDS="foo".

Thanks,
Donnie
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