Re: Unhelpful text in C-h v search-default-mode

[Emanuel Berg <incal@dataswamp.org>]

Alan Mackenzie wrote:

> Incidentally, why do we need the long string of hex digits
> in the subr names F616e....6461_anonymous_lambda_109?
> These are simply the ASCII codes for "anonymous_lambda"

Impressive that you just saw that!

I had to spend a lot of time before I even realized the
initial "F" is for function, i.e. not part of the hex string.

You just made one mistake, hex 2d is actually the hyphen, "-".
Yeah, this is what happens to people who rely on skills.

I found the code one the web and spent some time adopting it
to my style. But the credit for solving the problem belongs to
the SX user Inaimathi (see URL below).

As a side note, I know not everyone likes cl-lib and `cl-loop'
in particular but here at least I am very appreciative of the
below solution, style aspects not the least.

;;; -*- lexical-binding: t -*-
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/hex.el
;;
;; original code:
;;   https://stackoverflow.com/a/12007656

(require 'cl-lib)

(defun decode-hex (str)
  (apply #'concat
    (cl-loop
      for i from 0 to (1- (/ (length str) 2))
      for hex-byte = (substring str (* 2 i) (* 2 (1+ i)))
      collect (format "%c" (string-to-number hex-byte 16)) )))

;; (decode-hex "616e6f6e796d6f75732d6c616d626461") ; anonymous-lambda

(provide 'hex)

-- 
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