You'll need two things; ``computed-file'', and the ``(ice-9 popen)'' standard
library module. ``computed-file'' allows you to build a file-like object from
arbitrary code. Have a look here for an example from my configuration,

   https://git.sr.ht/~unmatched-paren/conf/tree/root/item/home.scm#L168

which removes all ``//'' comments from ``waybar.json'' before writing the
result to the store path.

Also see the Guix and Guile manuals on these two subjects,

   ``(ice-9 popen)'': 
https://www.gnu.org/software/guile/manual/html_node/Pipes.html
   ``computed-file'': 
https://guix.gnu.org/manual/en/html_node/G_002dExpressions.html#index-computed_002dfile



Thanks for your pointers, will try if I can fiddle something together!

Best,
Reza

--
Reza Housseini

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