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doc: Document clauses of 'modify-inputs'. 

Suggested by Alexander Asteroth <alexander.asteroth@h-brs.de>.

* doc/guix.texi (Defining Package Variants): Document all the supported
clauses of 'modify-inputs'.
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Ludovic Courtès 2022-01-03 17:44:31 +01:00
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@ -7625,8 +7625,22 @@ or replace package inputs.
@deffn {Scheme Syntax} modify-inputs @var{inputs} @var{clauses}
Modify the given package inputs, as returned by @code{package-inputs} & co.,
according to the given clauses. The example below removes the GMP and ACL
inputs of Coreutils and adds libcap to the back of the input list:
according to the given clauses. Each clause must have one of the
following forms:
@table @code
@item (delete @var{name}@dots{})
Delete from the inputs packages with the given @var{name}s (strings).
@item (append @var{package}@dots{})
Add @var{package}s to the end of the input list.
@item (prepend @var{package}@dots{})
Add @var{package}s to the front of the input list.
@end table
The example below removes the GMP and ACL inputs of Coreutils and adds
libcap to the back of the input list:
@lisp
(modify-inputs (package-inputs coreutils)