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From: Leo Prikler <leo.prikler@student.tugraz.at>
To: Luis Felipe <luis.felipe.la@protonmail.com>,
	guix-devel <guix-devel@gnu.org>
Subject: Re: What's the meaning of the percent sign in variable names
Date: Fri, 23 Apr 2021 16:49:05 +0200	[thread overview]
Message-ID: <0567efc70b7282ff6f40173cba74a61ce2647644.camel@student.tugraz.at> (raw)
In-Reply-To: <56kdRcoBgRuaTJ3WDZuJafflQQ4gld466rsxEpaHBkAv63kjjShKEEaQyL3n01WgUFyuUHpqLtW9VuZyeV6H4_C6NdB5nXd7BGxYJZ1UbXg=@protonmail.com>

Am Freitag, den 23.04.2021, 14:22 +0000 schrieb Luis Felipe:
> Hi,
> 
> Are all these constants (%base-packages, for example)? Is this a Guix
> convention or does it come from Guile? Although looking at Guile's
> Variable index I see many constants in uppercase, and also some
> variables prefixed with the percent sign, while Guix' Programming
> index doesn't seem to list any uppercase names.
The tendency to prepend variables with % certainly comes from Guile or
more generally Scheme.  The upper case constants in Guile likely come
from C, where this convention is more popular and IIUC often concerns
integer constants, that are in some way important for the C side of
things (think of stuff like OPEN_READ).  Since that is not a concern
for Guix, a package manager mostly written in Guile Scheme, we can
prefix our constants with a percent sign.

Regards,
Leo



  reply	other threads:[~2021-04-23 14:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-23 14:22 What's the meaning of the percent sign in variable names Luis Felipe
2021-04-23 14:49 ` Leo Prikler [this message]
2021-04-24 13:29   ` Luis Felipe
2021-05-04 15:49 ` Ludovic Courtès
2021-05-05 14:18   ` Luis Felipe

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