xtodo emacs site

• 2023-09-01
• write about identity ignore always
• ELisp: Apply Function (List to Args)
• Calling Functions (ELISP Manual)

put to tutorial

(defun xah-random-int (Min Max)
  "version 2022-08-26"
  (+ Min (random (- (1+ Max) Min))))

merge Emacs Lisp Examples to Xah Emacs Commands

• add missing buffer function in the emacs manual windows chapter
• ELisp: Buffer Functions

• in tutorial, mention when calling write-region or with-temp-buffer , it depends on file coding system. set it using let e.g. (coding-system-for-write 'utf-8-unix) . important if you are writing a emacs lisp script to be run in terminal

• 2022-05-07 fully document these functions Elisp: String Functions
• 2022-05-07 fully document these functions Elisp: Sequence Functions

looking-back is slow.

here's a typical usage:

(looking-back "[ \t\n]" (1- (point)) )

you can change it to:

;; warning. error if at point min
(prog2 (backward-char) (looking-at "[ \t\n]") (forward-char))

• ELisp: String Functions
• ELisp: Association List

• assoc-string
• string-search

If the length of a list is being computed to compare to a (small) number, the length<, length> and length= functions may be more efficient.