From: Xinglu Chen <public@yoctocell.xyz>
To: raingloom <raingloom@riseup.net>
Cc: guix-devel@gnu.org, Maxim Cournoyer <maxim.cournoyer@gmail.com>
Subject: Re: Best practices for writing services
Date: Thu, 22 Apr 2021 09:19:56 +0200 [thread overview]
Message-ID: <871rb27plv.fsf@yoctocell.xyz> (raw)
In-Reply-To: <20210422001052.4b8c17ec@riseup.net>
On Thu, Apr 22 2021, raingloom wrote:
>> One thing that I find a little annoying is that you have to specify a
>> default value for the fields.
>
> Are you sure? If you don't specify a default, won't the user just be
> forced to write
> (service whatever
> (whatever-configuration
> (mandatory-field 'bleepbloop)))
>
> instead of the shorter (service whatever)?
If I write something like this
#+begin_src scheme
(use-modules (gnu services configuration))
(define (serialize-list field-name val) "")
(define-configuration test-config
(config
(list)
"configuration for test"))
#+end_src
and evaluate it, I will get an error. I have to specify a default value
for the ‘config’ field to make it work.
#+begin_src scheme
(use-modules (gnu services configuration))
(define (serialize-list field-name val) "")
(define-configuration test-config
(config
(list '()) ;default to '()
"configuration for test"))
#+end_src
next prev parent reply other threads:[~2021-04-22 7:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-18 15:23 Best practices for writing services Xinglu Chen
2021-03-19 16:12 ` Joshua Branson
2021-03-19 17:01 ` Xinglu Chen
2021-04-21 3:54 ` Maxim Cournoyer
2021-04-21 10:45 ` Xinglu Chen
2021-04-21 18:05 ` Maxim Cournoyer
2021-04-22 7:27 ` Xinglu Chen
2021-04-23 4:42 ` Maxim Cournoyer
2021-04-23 6:04 ` Xinglu Chen
2021-04-21 22:10 ` raingloom
2021-04-22 7:19 ` Xinglu Chen [this message]
2021-04-26 20:29 ` raingloom
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