From: Emanuel Berg <incal@dataswamp.org>
To: help-gnu-emacs@gnu.org
Cc: Andreas <saerdna@hush.com>, Jovelou <jajo@1x.com>,
Ladbon <ladbon.m@gmail.com>, Pebben <patrickbylund@gmail.com>,
Per <per.thastrom@gmail.com>
Subject: new `pcase-let' syntax hotter than TikTok girls?
Date: Wed, 23 Nov 2022 11:26:49 +0100 [thread overview]
Message-ID: <87o7syezkm.fsf@dataswamp.org> (raw)
Check out this syntax with `pcase-let'! :O
(pcase-let ((`(,up ,down) (if button
`(,#'backward-button ,#'forward-button)
`(,#'previous-line ,#'forward-line) ))) ... )
Advantage: A single test (here, `if') but without the bulky
and ugly combo with `let*' and `car'/`cadr' ...
Here is an example how it can be used, and actually is used already [1]
(defun set-vertical-keys (kmap &optional button np tab)
(pcase-let ((`(,up ,down) (if button
`(,#'backward-button ,#'forward-button)
`(,#'previous-line ,#'forward-line) )))
(define-key kmap "i" up)
(define-key kmap "k" down)
(when np
(define-key kmap "p" up)
(define-key kmap "n" down) )
(when tab
(define-key kmap [backtab] up)
(define-key kmap "\t" down) )))
and then for example [2]
(let ((kmap Buffer-menu-mode-map))
(set-vertical-keys kmap nil nil t)
;; ...
)
Too sexy for its shirt!
[1] https://dataswamp.org/~incal/emacs-init/scroll.el
[2] https://dataswamp.org/~incal/emacs-init/buffer-menu.el
--
underground experts united
https://dataswamp.org/~incal
next reply other threads:[~2022-11-23 10:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-23 10:26 Emanuel Berg [this message]
2022-11-24 19:06 ` new `pcase-let' syntax Philip Kaludercic
2022-11-24 20:28 ` [External] : " Drew Adams
2022-11-26 16:01 ` Emanuel Berg
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