Hi Maxime,

Maxime Devos <maximedevos@telenet.be> skribis:

> Seems like we are missing a general & documented & simple to use
> 'lower-object-completely' (or maybe 'compile-object'?) procedure for
> this ...  And maybe also a ,build-object REPL command?

How about the attached patch?

Sample session:

--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> ,use(gnu packages base)
scheme@(guile-user)> ,build coreutils
$11 = "/gnu/store/y8933036ljrz4ah9zcph09nmvdmmv5sf-coreutils-8.32-debug"
$12 = "/gnu/store/8fpk2cja3f07xls48jfnpgrzrljpqivr-coreutils-8.32"
scheme@(guile-user)> ,lower coreutils
$13 = #<derivation /gnu/store/nc93q3hmlzcgdn6jr7dv3j2m50ivn55f-coreutils-8.32.drv => /gnu/store/y8933036ljrz4ah9zcph09nmvdmmv5sf-coreutils-8.32-debug /gnu/store/8fpk2cja3f07xls48jfnpgrzrljpqivr-coreutils-8.32 7f0ebaf821e0>
scheme@(guile-user)> ,build (computed-file "foo" #~(begin (display "hi!\n")(mkdir #$output)(mkdir #$output:lib)))
$14 = "/gnu/store/axij9bkg56xv3k1z0l20gd6b0swn14sy-foo-lib"
$15 = "/gnu/store/h5s7k7m0fxk9n7q7729l3n4q7vyxnvpy-foo"
scheme@(guile-user)> ,build (computed-file "foo" #~(begin (display "Goeden dag!\n")(mkdir #$output)))
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://guix.bordeaux.inria.fr'... 100.0%
building /gnu/store/gplhka9g0bwv8b640zavw1z65y9zrvag-foo.drv...
$16 = "/gnu/store/ynvga6gxwj68mmk8ddj3i9sjhavkqah1-foo"
--8<---------------cut here---------------end--------------->8---

“lower” does what you would expect; “build” yields one value per output.

If that works for you, I’ll update the manual accordingly, and we can
always add more features (like build options) later on.  Thoughts?

Thanks,
Ludo’.