bug#53915: No way of replacing an input in modify-input syntax structure but keep all the outputs

[Liliana Marie Prikler <liliana.prikler@gmail.com>]

Am Dienstag, dem 08.03.2022 um 17:11 +0100 schrieb Ludovic Courtès:
> [...]
> With the patch below, we get more sensible behavior:
> 
> --8<---------------cut here---------------start------------->8---
> scheme@(guile-user)> (modify-inputs (append $5 $4)
>                        (replace "glib" xpdf))
> $8 = (("glib" #<package xpdf@4.03 gnu/packages/pdf.scm:395
> 7f9b1457c9a0>) ("pkg-config" #<package
> pkg-config@0.29.2 gnu/packages/pkg-config.scm:36 7f9b13a30580>)
> ("glib" #<package xpdf@4.03 gnu/packages/pdf.scm:395 7f9b1457c9a0>
> "bin") ("gobject-introspection" #<package
> gobject-introspection@1.66.1 gnu/packages/glib.scm:428
> 7f9b12994e70>))
> --8<---------------cut here---------------end--------------->8---
> 
> If that makes sense to you, I’ll go ahead with this change and adjust
> documentation accordingly.
Sounds better than my own suggestion, since it'll keep working the way
it did even when labels are eventually dropped.  If more control is
needed, we can always later extend it to support (replace ("label"
"output") (package output)).  WDYT?

Cheers