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From: Ricardo Wurmus <rekado@elephly.net>
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Date: Tue, 26 Feb 2019 09:12:25 +0100
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Subject: Re: variable interpolation in code snippets
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To: zimoun <zimon.toutoune@gmail.com>
Cc: gwl-devel@gnu.org


zimoun <zimon.toutoune@gmail.com> writes:

> A quick question. The `data-inputs` is a list, so `print
> "{{data-inputs}}` should return:
>      "sample.bam" "hg38.fa" "abc"
> Right?
>
> How to refer to "hg38.fa" only?
>
>    print "{{second data-inputs}}"

That=E2=80=99s not possible, unfortunately.  Currently, the list is merely
converted to a string, so (list "sample.bam" "hg38.fa" "abc") becomes
the string =E2=80=9Csample.bam hg38.fa abc=E2=80=9D.  For singleton lists t=
hat=E2=80=99s exactly
what you want, but it=E2=80=99s not great for longer lists.

I thought about adding support for selectors, but I don=E2=80=99t know if I
should.  Maybe it would be better to allow for named inputs instead,
which would result in process-local bindings.

This would probably require changes to the records macro that we took
from Guix.  I=E2=80=99d prefer that over implementing a small language in a
reader macro.

--
Ricardo