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[bug#30657] [PATCH 2/4] gexp: Add 'file-like?'.

From: Ludovic Courtès
Subject: [bug#30657] [PATCH 2/4] gexp: Add 'file-like?'.
Date: Sat, 03 Mar 2018 15:38:57 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Clément Lassieur <address@hidden> skribis:

> Ludovic Courtès <address@hidden> writes:
>>> +(define (file-like? object)
>>> +  (or (local-file? object)
>>> +      (plain-file? object)
>>> +      (computed-file? object)
>>> +      (program-file? object)
>>> +      (scheme-file? object)
>>> +      (file-append? object)))
>> This procedure would miss new types added with ‘define-gexp-compiler’.
>> In fact I think you can simply write:
>>   (define file-like? (@@ (guix gexp) lookup-compiler))
>> Does that make sense?
> Yes it's great!  One also needs to check that it's a struct though.  I
> put it in (gnu services configuration).  Would it make sense to add the
> 'struct?' check in (guix gexp), or to add 'file-like?' there?

Yes, it makes sense to add ‘file-like?’ to (guix gexp) proper, as I
wrote in my other reply.

I was hoping we could avoid that, but I understand there’s a need for it.


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