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From: Nikita Karetnikov <nikita@karetnikov.org>
To: guile-user@gnu.org
Subject: SRFI-37: option
Date: Tue, 25 Dec 2012 15:03:35 -0500	[thread overview]
Message-ID: <87zk117vby.fsf@karetnikov.org> (raw)

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Hello,

I have some questions about the '%options' variable. [1]

1. According to the documentation, 'option' accepts four arguments:
   'names', 'required-arg?', 'optional-arg?', 'processor' and
   "processor is a procedure that takes at least 3 arguments..." [2]

   So why do some options (e.g., 'version') only accept a single
   argument? Does it mean that the above quotation is incorrect?

2. How does 'processor' work?

   For instance, 'version' creates a procedure that accepts a single
   argument (i.e., 'args'), but it doesn't use that argument, does it?

3. Could you elaborate on 'list-available'?

   What will happen if I run 'guix-package -A nano'? What values will
   be assigned to 'opt', 'name', 'arg', and 'result'?

Nikita

[1] http://git.savannah.gnu.org/cgit/guix.git/tree/guix-package.in
[2] https://gnu.org/software/guile/manual/guile.html

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             reply	other threads:[~2012-12-25 20:03 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-25 20:03 Nikita Karetnikov [this message]
2012-12-26  1:18 ` SRFI-37: option Daniel Hartwig

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