gnus: Predicate Specifiers
9.11 Predicate Specifiers
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Some Gnus variables are “predicate specifiers”. This is a special form
that allows flexible specification of predicates without having to type
all that much.
These specifiers are lists consisting of functions, symbols and
lists.
Here’s an example:
(or gnus-article-unseen-p
gnus-article-unread-p)
The available symbols are ‘or’, ‘and’ and ‘not’. The functions all
take one parameter.
Internally, Gnus calls ‘gnus-make-predicate’ on these specifiers to
create a function that can be called. This input parameter to this
function will be passed along to all the functions in the predicate
specifier.
Info Catalog
gnus: Undo
gnus: Various
gnus: Moderation