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doc: Document how to use specific package outputs in code.

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* doc/guix.texi (Packages with Multiple Outputs): Provide an example of
selecting a package's output in Scheme.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
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Karl Hallsby 2023-01-08 13:37:55 -06:00 committed by Maxim Cournoyer
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@ -113,6 +113,7 @@ Copyright @copyright{} 2022⁠–⁠2023 Bruno Victal@*
Copyright @copyright{} 2022 Ivan Vilata-i-Balaguer@*
Copyright @copyright{} 2023 Giacomo Leidi@*
Copyright @copyright{} 2022 Antero Mejr@*
Copyright @copyright{} 2023 Karl Hallsby
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
@ -4317,6 +4318,25 @@ The command to install its documentation is:
guix install glib:doc
@end example
While the colon syntax works for command-line specification of package
outputs, it will not work when using a package @emph{variable} in Scheme
code. For example, to add the documentation of @code{glib} to the
globally installed packages of an @code{operating-system} (see
@ref{operating-system Reference}), a list of two items, the first one
being the package @emph{variable} and the second one the name of the
output to select (a string), must be used instead:
@lisp
(use-modules (gnu packages glib))
;; glib-with-documentation is the Guile symbol for the glib package
(operating-system
...
(packages
(append
(list (list glib-with-documentation "doc"))
%base-packages)))
@end lisp
Some packages install programs with different ``dependency footprints''.
For instance, the WordNet package installs both command-line tools and
graphical user interfaces (GUIs). The former depend solely on the C