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Add macro seq-setq.

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* doc/lispref/sequences.texi (seq-setq): Document this macro.

* test/lisp/emacs-lisp/seq-tests.el (test-seq-setq):
Test this macro (bug#50053).
This commit is contained in:
Earl Hyatt 2021-08-14 14:17:55 +02:00 committed by Lars Ingebrigtsen
parent c58f8dda2b
commit a8a3fd8f8e
2 changed files with 41 additions and 0 deletions
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17
doc/lispref/sequences.texi
View File

@ -1128,6 +1128,23 @@ assigned to variables as if by @code{setq} instead of as in a
@end example
@end defmac
@defmac seq-setq var-sequence val-sequence
@cindex sequence destructuring
This macro works similarly to @code{seq-let}, except that values are
assigned to variables as if by @code{setq} instead of as in a
@code{let} binding.
@example
@group
(let ((a nil)
(b nil))
(seq-setq (_ a _ b) '(1 2 3 4))
(list a b))
@result{} (2 4)
@end group
@end example
@end defmac
@defun seq-random-elt sequence
This function returns an element of @var{sequence} taken at random.

24
test/lisp/emacs-lisp/seq-tests.el
View File

@ -407,6 +407,30 @@ Evaluate BODY for each created sequence.
(should (null b))
(should (null c))))
(ert-deftest test-seq-setq ()
(with-test-sequences (seq '(1 2 3 4))
(let (a b c d e)
(seq-setq (a b c d e) seq)
(should (= a 1))
(should (= b 2))
(should (= c 3))
(should (= d 4))
(should (null e)))
(let (a b others)
(seq-setq (a b &rest others) seq)
(should (= a 1))
(should (= b 2))
(should (same-contents-p others (seq-drop seq 2)))))
(let ((a)
(seq '(1 (2 (3 (4))))))
(seq-setq (_ (_ (_ (a)))) seq)
(should (= a 4)))
(let (seq a b c)
(seq-setq (a b c) seq)
(should (null a))
(should (null b))
(should (null c))))
(ert-deftest test-seq-min-max ()
(with-test-sequences (seq '(4 5 3 2 0 4))
(should (= (seq-min seq) 0))