Xah Talk Show 2021-11-21 Emacs Lisp Coding, Video File Extension/Suffix, Midi

• main topic: modify xah-html-video-file-suffix-p etc, to use a customizable var list instead.

• Emacs: Xah HTML Mode (xah-html-mode.el)
• PowerShell: List Files
• Elisp: Sequence Functions
• naming of things, file extension vs file suffix

• Buying MIDI Keyboard
• The Unfortunate Fate of Music MIDI File
• Piano MIDI Notes Art
• Audio Recorder, Synthesizers, MIDI Software
• Liszt Keyboard Music List
• Bach, Well-Tempered Clavier, Book 1, Fugue #4

(defun xah-html-video-file-suffix-p (Path)
  "Returns t if Path has video file suffix e.g. mp4, else nil.
Version 2018-11-14 2021-09-24"
  (let ((case-fold-search t))
    (string-match
     "\\.mp4\\'\\|\\.mov\\'\\|\\.mkv\\'\\|\\.webm\\'\\|\\.m1v\\'\\|\\.m4v\\'" Path)))

xah_talk_show_2021-11-21.txt