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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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@ -7625,8 +7625,22 @@ or replace package inputs.
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@deffn {Scheme Syntax} modify-inputs @var{inputs} @var{clauses}
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Modify the given package inputs, as returned by @code{package-inputs} & co.,
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according to the given clauses. The example below removes the GMP and ACL
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inputs of Coreutils and adds libcap to the back of the input list:
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according to the given clauses. Each clause must have one of the
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following forms:
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@table @code
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@item (delete @var{name}@dots{})
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Delete from the inputs packages with the given @var{name}s (strings).
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@item (append @var{package}@dots{})
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Add @var{package}s to the end of the input list.
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@item (prepend @var{package}@dots{})
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Add @var{package}s to the front of the input list.
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@end table
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The example below removes the GMP and ACL inputs of Coreutils and adds
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libcap to the back of the input list:
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@lisp
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(modify-inputs (package-inputs coreutils)
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