From: John Darrington <john@darrington.wattle.id.au>
To: Ludovic Court??s <ludo@gnu.org>
Cc: guix-devel@gnu.org, John Darrington <jmd@gnu.org>
Subject: Re: [PATCH] gnu: Allow nfs file systems to be automatically mounted.
Date: Tue, 29 Nov 2016 07:27:48 +0100 [thread overview]
Message-ID: <20161129062747.GA24796@jocasta.intra> (raw)
In-Reply-To: <87lgw3l3hw.fsf@gnu.org>
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On Mon, Nov 28, 2016 at 10:05:15PM +0100, Ludovic Court??s wrote:
John Darrington <john@darrington.wattle.id.au> skribis:
> On Mon, Nov 28, 2016 at 02:59:09PM +0100, Ludovic Court??s wrote:
> > ???match???,
> >
> > Have another look: + (let* ((host (match (string-split source #\:) ((h _) h)))
>
> Right, but there are other occurrences of ???car??? for ???getaddrinfo???. :-)
>
> But that occurance applies to a real list, rather than a list used as record.
> In other words, I really do just want to get the first item of that list.
> As I understand it, match is supposed to be used for heterogenous lists where
> each member has its own semantics. That is not the case here.
???match??? can be used to match anything, and I highly recommend using it
for lists (info "(guile) Pairs"): it generates clearer and foolproof
code.
In this case ???getaddrinfo??? might well return an empty list.
So then "car" would raise an error (unless I check it first with pair?) - just
as match would raise an error unless I add a catch-all case. I'm still not
convinced that match has any advantages in this case.
However I've changed it despite that, and pushed this patch to master. I hope
it's ok.
J'
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next prev parent reply other threads:[~2016-11-29 6:28 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-10 21:14 [PATCH 1/4] gnu: Separate util-linux into three packages John Darrington
2016-11-10 21:14 ` [PATCH 2/4] gnu: nfs-utils: Change input from util-linux to util-linux/mount John Darrington
2016-11-10 21:14 ` [PATCH 3/4] gnu: Move util-linux/mount to new file and deal with the effects John Darrington
2016-11-10 21:14 ` [PATCH 4/4] Add fs-search paths to util-linux John Darrington
2016-11-11 14:43 ` [PATCH 1/4] gnu: Separate util-linux into three packages Hartmut Goebel
2016-11-11 16:03 ` John Darrington
2016-11-11 16:40 ` Hartmut Goebel
2016-11-11 19:36 ` John Darrington
2016-11-12 14:53 ` Ludovic Courtès
2016-11-12 15:28 ` John Darrington
2016-11-12 17:09 ` John Darrington
2016-11-12 22:55 ` Ludovic Courtès
2016-11-13 8:21 ` John Darrington
2016-11-13 11:59 ` Ludovic Courtès
2016-11-13 14:06 ` John Darrington
2016-11-14 9:48 ` Ludovic Courtès
2016-11-14 17:46 ` John Darrington
2016-11-15 10:46 ` Ludovic Courtès
2016-11-16 21:06 ` mount syscall John Darrington
2016-11-17 9:47 ` Ludovic Courtès
2016-11-22 19:15 ` [PATCH] gnu: Allow nfs filesystems to be automatically mounted John Darrington
2016-11-23 22:07 ` Ludovic Courtès
2016-11-23 23:32 ` John Darrington
2016-11-24 16:08 ` Ludovic Courtès
2016-11-26 9:36 ` [PATCH] gnu: Allow nfs file systems " John Darrington
2016-11-26 18:37 ` Ludovic Courtès
2016-11-26 19:33 ` John Darrington
2016-11-28 13:59 ` Ludovic Courtès
2016-11-28 14:07 ` John Darrington
2016-11-28 21:05 ` Ludovic Courtès
2016-11-29 6:27 ` John Darrington [this message]
2016-11-29 21:51 ` Ludovic Courtès
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