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Diffstat (limited to 'configs/shared/.emacs.d/wpc/random.el')
-rw-r--r-- | configs/shared/.emacs.d/wpc/random.el | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/configs/shared/.emacs.d/wpc/random.el b/configs/shared/.emacs.d/wpc/random.el deleted file mode 100644 index 148506c04d4e..000000000000 --- a/configs/shared/.emacs.d/wpc/random.el +++ /dev/null @@ -1,73 +0,0 @@ -;;; random.el --- Functions for working with randomness -*- lexical-binding: t -*- -;; Author: William Carroll <wpcarro@gmail.com> - -;;; Commentary: -;; Functions for working with randomness. Some of this code is not as -;; functional as I'd like from. - -;;; Code: - -(require 'prelude) -(require 'number) -(require 'math) -(require 'series) -(require 'list) -(require 'set) - -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;; Library -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; - -(defun random/int (x) - "Return a random integer from 0 to `X'." - (random x)) - -;; TODO: Make this work with sequences instead of lists. -(defun random/choice (xs) - "Return a random element of `XS'." - (let ((ct (list/length xs))) - (list/get - (random/int ct) - xs))) - -(defun random/boolean? () - "Randonly return t or nil." - (random/choice (list t nil))) - -;; TODO: This may not work if any of these generate numbers like 0, 1, etc. -(defun random/uuid () - "Return a generated UUID string." - (let ((eight (number/dec (math/triangle-of-power :base 16 :power 8))) - (four (number/dec (math/triangle-of-power :base 16 :power 4))) - (twelve (number/dec (math/triangle-of-power :base 16 :power 12)))) - (format "%x-%x-%x-%x-%x" - (random/int eight) - (random/int four) - (random/int four) - (random/int four) - (random/int twelve)))) - -(defun random/token (length) - "Return a randomly generated hexadecimal string of LENGTH." - (->> (series/range 0 (number/dec length)) - (list/map (lambda (_) (format "%x" (random/int 15)))) - (list/join ""))) - -;; TODO: Support random/sample -(defun random/sample (n xs) - "Return a randomly sample of list XS of size N." - (prelude/assert (and (>= n 0) (< n (list/length xs)))) - (cl-labels ((do-sample - (n xs y ys) - (if (= n (set/count ys)) - (->> ys - set/to-list - (list/map (lambda (i) - (list/get i xs)))) - (if (set/contains? y ys) - (do-sample n xs (random/int (list/length xs)) ys) - (do-sample n xs y (set/add y ys)))))) - (do-sample n xs (random/int (list/length xs)) (set/new)))) - -(provide 'random) -;;; random.el ends here |