write strings with bits

[Emanuel Berg]

Some fun code to write strings in binary ...

Cred to whoever wrote that at codereview.

There are more logical binary operands BTW, but don't look for
"logor", it is called `logior' ...

;;; -*- lexical-binding: t -*-
;;
;; cred:
;;   https://codereview.stackexchange.com/q/186840
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/str-to-bits.el

(require 'esh-util)

(defun number-to-bitstring (num)
  (let ((s ""))
    (while (> num 0)
      (setq s (concat (number-to-string (logand num 1)) s))
      (setq num (ash num -1)) )
    (if (string= "" s)
        "0"
      s) ))

(defalias 'dec2bits #'number-to-bitstring)

;; (dec2bits ?a) ; 1100001

(defun str-to-bits (str &optional delim)
  (interactive "sString: ")
  (or delim (setq delim " "))
  (let ((bits))
    (dolist (c (string-to-list str) (mapconcat #'eshell-stringify bits delim))
      (push (number-to-bitstring c) bits) )))

;; (str-to-bits "What's up Emacs community?") ; 111111 1110000 1110101 [...]

(provide 'str-to-bits)

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