diff options
author | William Carroll <wpcarro@gmail.com> | 2019-10-09T11·13+0100 |
---|---|---|
committer | William Carroll <wpcarro@gmail.com> | 2019-12-24T15·21+0000 |
commit | 6b456c1b7a4f6899f063a6e65355af51901d9c7a (patch) | |
tree | cfc70d74818ae9fabdbbfb0cf16cce092e4c1a09 /configs/shared/.emacs.d/wpc/dotted.el | |
parent | a7c72adb2ebec1e497fc040eaf3551d564d61a5b (diff) |
Massive configuration overhaul
Currently paying the price of months of non-diligent git usage. Here's what has changed. - Theming support in Gvcci and wpgtk - Dropping support for i3 - Supporting EXWM - Many Elisp modules - Collapsed redundant directories in ./configs
Diffstat (limited to 'configs/shared/.emacs.d/wpc/dotted.el')
-rw-r--r-- | configs/shared/.emacs.d/wpc/dotted.el | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/configs/shared/.emacs.d/wpc/dotted.el b/configs/shared/.emacs.d/wpc/dotted.el new file mode 100644 index 000000000000..90ef39f92e7e --- /dev/null +++ b/configs/shared/.emacs.d/wpc/dotted.el @@ -0,0 +1,49 @@ +;;; dotted.el --- Working with dotted pairs in Elisp -*- lexical-binding: t -*- +;; Author: William Carroll <wpcarro@gmail.com> + +;;; Commentary: +;; Part of my primitives library extensions in Elisp. Contrast my primitives +;; with the wrapper extensions that I provide, which expose immutable variants +;; of data structures like an list, alist, tuple, as well as quasi-typeclasses +;; like sequence, etc. + +;;; Code: + +(require 'prelude) +(require 'macros) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Library +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(cl-defun dotted/new (&optional a b) + "Create a new dotted pair (i.e. cons cell)." + (cons a b)) + +(defun dotted/instance? (x) + "Return t if X is a dotted pair." + (let ((b (cdr x))) + (and b (atom b)))) + +(defun dotted/first (x) + "Return the first element of X." + (car x)) + +(defun dotted/second (x) + "Return the second element of X." + (cdr x)) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Tests +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(progn + (prelude/assert + (equal '(fname . "Bob") (dotted/new 'fname "Bob"))) + (prelude/assert + (dotted/instance? '(one . two))) + (prelude/refute + (dotted/instance? '(1 2 3)))) + +(provide 'dotted) +;;; dotted.el ends here |