[gentoo-dev] use foo && bar vs. [ `use foo` ] && bar

[gentoo-dev] use foo && bar vs. [ `use foo` ] && bar

[Tom Knight]

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Hi

First I want to say how glad I am to be part of the dev team. I'll try my
best not to screw anything up, so excuse any silly questions I'm bound to
have.

Back on topic, I've searched for this on bugzilla, and didn't find anything,
but I'm sure it's come up on the forums before. There are several ebuilds
which have something along the lines of:

use foo && bar

Which executes bar if the foo USE flag is set, the problem is that the use
function not only returns true when the USE flag is set it also echos the
flag to stdout. When you emerge something you end up with loads of use flags
outputted.

The solution is to do it like this:

[ `use foo` ] && bar

Which returns true if foo is in USE, but doesn't output the USE flag. 

I'm going have a go at fixing some of the net-mail packages, if others can
do the same taht would be great.

tom

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Re: [gentoo-dev] use foo && bar vs. [ `use foo` ] && bar

[Ciaran McCreesh]

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On Mon, 19 Jul 2004 18:33:49 +0100 Tom Knight <tomk@gentoo.org> wrote:
| Back on topic, I've searched for this on bugzilla, and didn't find
| anything, but I'm sure it's come up on the forums before. There are
| several ebuilds which have something along the lines of:
| 
| use foo && bar

This is correct.

| Which executes bar if the foo USE flag is set, the problem is that the
| use function not only returns true when the USE flag is set it also
| echos the flag to stdout. When you emerge something you end up with
| loads of use flags outputted.

This is about to change. In the future use will be silent and usev (?
can't remember whether it's a v...) will output.

| The solution is to do it like this:
| 
| [ `use foo` ] && bar

Don't do that.

| I'm going have a go at fixing some of the net-mail packages, if others
| can do the same taht would be great.

Don't. You'll just have to un'fix' it again later :)

-- 
Ciaran McCreesh : Gentoo Developer (Sparc, MIPS, Vim, Fluxbox)
Mail            : ciaranm at gentoo.org
Web             : http://dev.gentoo.org/~ciaranm


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Re: [gentoo-dev] use foo && bar vs. [ `use foo` ] && bar

[Tom Knight]

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On Mon, Jul 19, 2004 at 06:33:49PM +0100, Tom Knight wrote:
> 
> The solution is to do it like this:
> 
> [ `use foo` ] && bar
> 
> Which returns true if foo is in USE, but doesn't output the USE flag. 

OK, have had a word with a few people on #g-dev, the way that the use
function works is going to change so that it doesn't output the use flag, so
ignore what I said in the last message.

tom


-- 
Tom Knight
tomk@gentoo.org
GPG Public Key: http://dev.gentoo.org/~tomk/tomk.asc

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Re: [gentoo-dev] use foo && bar vs. [ `use foo` ] && bar

[Mike Frysinger]

On Monday 19 July 2004 01:33 pm, Tom Knight wrote:
> First I want to say how glad I am to be part of the dev team. I'll try my
> best not to screw anything up, so excuse any silly questions I'm bound to
> have.

well you e-mailed gentoo-dev before breaking these packages so you're getting 
off on the right foot :)

> Back on topic, I've searched for this on bugzilla, and didn't find
> anything, but I'm sure it's come up on the forums before. There are several
> ebuilds which have something along the lines of:

search the mail archives for threads that go into this in detail
-mike

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Re: [gentoo-dev] use foo && bar vs. [ `use foo` ] && bar

[Stuart Herbert]

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On Monday 19 July 2004 18:33, Tom Knight wrote:
> The solution is to do it like this:
>
> [ `use foo` ] && bar

*cough cough* useq

useq foo && bar

Best regards,
Stu
-- 
Stuart Herbert                                              stuart@gentoo.org
Gentoo Developer                                       http://www.gentoo.org/
                                                   http://stu.gnqs.org/diary/

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Re: [gentoo-dev] use foo && bar vs. [ `use foo` ] && bar

[Mike Frysinger]

On Monday 19 July 2004 04:53 pm, Stuart Herbert wrote:
> *cough cough* useq

useq is dead; please dont ever mention or use it ever again
-mike

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