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To: gentoo-dev@g.o
From: Brian Harring <ferringb@...>
Subject: Re: new `usex` helper
Date: Tue, 13 Sep 2011 20:04:06 -0700
On Tue, Sep 13, 2011 at 10:45:27PM -0400, Mike Frysinger wrote:
> On Tuesday, September 13, 2011 19:08:09 Brian Harring wrote:
> > Making it overridable seems wiser-
> > 
> > usex() {
> > 	local flag="$1"
> > 	local tval=${2-yes}
> > 	local fval=${3-no}
> > 	if use $flag; then
> > 		echo "${tval}"
> > 	else
> > 		echo "${fval}"
> > 	fi
> > }
> 
> i dont get it.  mine already does exactly this, just in one line.
> usex() { use $1 && echo ${2:-yes} || echo ${3:-no} ; }

Err.  Mines prettier?

*cough*

Only real difference is ${2:-yes} versus ${2-yes}; the latter should 
be used so that `usex flag '' '--disable-some-feature'` is usable.


> > While a bit longer, we likely can gut most of the use_* logic to
> > use that, and it makes it easier to deal w/ the situations where a
> > configure's options always assume --enable-blah thus don't export the
> > option, but *do* export a --disable-blah.
> 
> yeah, i thought about replacing use_{with,enable} with usex, but we'd have to 
> extend usex() a little bit more

Only extension I can think of is adding a prefix/postfix... which 
frankly seems a bit too much.  Anything else you were looking for?

To be clear, I'm more interested in this from the standpoint of making 
econf invocations simpler- simplifying use_enable/use_with in the PM 
isn't a huge concern to me since they're already pretty bloody 
straightforward at this point.

~brian


Replies:
Re: new `usex` helper
-- Mike Frysinger
References:
new `usex` helper
-- Mike Frysinger
Re: new `usex` helper
-- Mike Frysinger
Re: new `usex` helper
-- Brian Harring
Re: new `usex` helper
-- Mike Frysinger
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