Simplify and fix the definition of the Org-mode YouTube link type
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README.org
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README.org
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@ -2931,205 +2931,54 @@ See `org-link-parameters' for details about PATH, DESC and FORMAT."
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:END:
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Listing [[lst:define-org-yt-link-type][define org-yt-link type]] implements code to open the link to the
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following YouTube video [[yt:eaZUZCzaIgw#6s#10s][Extending org-mode to handle YouTube links.]]
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following YouTube video [[yt:eaZUZCzaIgw][Extending org-mode to handle YouTube links]] and the
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following [[https://raw.githubusercontent.com/bitspook/spookmax.d/master/readme.org][Emacs setup]].
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Opening [[yt:eaZUZCzaIgw][Extending org-mode to handle YouTube links]] may fail due to a bug in the
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interface between =mpv= and =yt-dlp=. Listing [[lst:set-emms-options][set EMMS options]] indicates how to
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work around this bug at the cost of making the user interface less clean.
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However, the link [[yt:48JlgiBpw_I][Absolute Beginner's Guide to Emacs]] works always.
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The following posts provide programming information:
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1. [[https://developers.google.com/youtube/v3/docs][YouTube API reference]].
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2. [[https://developers.google.com/youtube/iframe_api_reference][YouTube Player API reference for iframe embeds]].
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3. [[https://www.alphr.com/how-to-link-specific-timestamp-youtube/][How to link to a specific timestamp in a YouTube video]].
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#+begin_src emacs-lisp -n :exports none :tangle no
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;; https://www.youtube.com/embed/M03bTkQxVUg?start=30&end=120
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(org-yt-seconds-to-hms (+ (* 3600 120) (* 60 9) 7))
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(org-yt-seconds-to-hms 3661)
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(org-yt-time-to-seconds "")
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(org-yt-time-to-seconds "1")
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(org-yt-time-to-seconds "1:1")
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(org-yt-time-to-seconds "1:1:1")
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(org-yt-time-to-seconds "1h1m1s")
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(org-yt-time-to-seconds "1mX")
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(org-yt-time-to-seconds "1h")
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(org-yt-time-to-seconds "1H1m")
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(org-yt-time-to-seconds "1h1s")
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(org-yt-time-to-seconds "1m1s")
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(org-yt-time-to-seconds "1h1s")
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(org-yt-time-to-seconds "1h1M1s")
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(org-yt-format-open-url "WKwZHSbHmPg" "")
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(org-yt-format-open-url "WKwZHSbHmPg" nil)
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(org-yt-format-open-url "WKwZHSbHmPg" '("1m1s"))
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(org-yt-format-open-url "WKwZHSbHmPg" '("0:2:44" "0:2:50"))
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(org-yt-open "WKwZHSbHmPg#0:2:44#0:2:50" t)
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(org-yt-export "WKwZHSbHmPg#0:2:44#0:2:50" "Title" 'html nil)
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(org-yt-export "WKwZHSbHmPg#0h2m40s#0h2m50s" "Title" 'html nil)
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(org-yt-export "WKwZHSbHmPg#2M40S#2M50S" "Title" 'html nil)
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(org-yt-export "WKwZHSbHmPg#0:2:44#0:2:50" "Title" 'latex nil)
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(org-yt-export "WKwZHSbHmPg#0h2m40s#0h2m50s" "Title" 'latex nil)
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(org-yt-export "WKwZHSbHmPg#2M40S#2M50S" "Title" 'latex nil)
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#+end_src
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#+caption[Parsing function for the =org-yt= link type]:
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#+caption: Parsing function for the =org-yt= link type.
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#+name: lst:org-yt-parsing
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#+begin_src emacs-lisp -n :results silent
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(defun org-yt-time-to-seconds (text)
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"Convert TEXT of the form `12:34:56' or `12h34m56s' to seconds as integers."
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(let* ((case-fold-search t)
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(hms (< (length (split-string text "[:]"))
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(length (split-string text "[HhMmSs]"))))
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(regexp (if hms
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(rx (opt (group (+ digit) "h"))
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(opt (group (+ digit) "m"))
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(opt (group (+ digit) "s")))
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(rx (opt (group (+ digit)))
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(opt ":" (group (+ digit)))
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(opt ":" (group (+ digit))))))
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(_ (string-match regexp text))
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(md (match-data))
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(found (substring text (pop md) (pop md)))
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(seconds 0)
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lot)
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(if (string< found text)
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(user-error "Found `%s' which is a prefix of `%s'" found text)
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(if hms
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(while md
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(setq lot (substring text (or (pop md) 0) (or (pop md) 0)))
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(cond
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((or (string-suffix-p "h" lot) (string-suffix-p "H" lot))
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(setq seconds (+ seconds (* 3600 (string-to-number lot)))))
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((or (string-suffix-p "m" lot) (string-suffix-p "M" lot))
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(setq seconds (+ seconds (* 60 (string-to-number lot)))))
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((or (string-suffix-p "s" lot) (string-suffix-p "S" lot))
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(setq seconds (+ seconds (string-to-number lot))))))
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(while md (push (string-to-number
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(substring text (or (pop md) 0) (or (pop md) 0)))
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lot))
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(cond
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((length= lot 1) (setq seconds (car lot)))
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((length= lot 2) (setq seconds (+ (* 60 (cadr lot))
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(car lot))))
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((length= lot 3) (setq seconds (+ (* 3600 (caddr lot))
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(* 60 (cadr lot))
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(car lot)))))))
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seconds))
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#+end_src
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#+caption[Formatting functions to open =org-yt= links]:
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#+caption: Formatting functions to open =org-yt= links.
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#+name: lst:org-yt-open-formatting
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#+begin_src emacs-lisp -n :results silent
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(defun org-yt-seconds-to-hms (seconds)
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"Convert seconds as integers to text of the form `12h34m56s'."
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(let ((h (/ seconds 3600))
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(m (/ (% seconds 3600) 60))
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(s (% seconds 60)))
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(concat (and (> h 0) (format "%dh" h))
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(if (> h 0)
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(format "%02dm" m)
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(and (> m 0) (format "%dm" m)))
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(if (or (> h 0) (> m 0))
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(format "%02ds" s)
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(format "%ds" s)))))
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(defconst org-yt-start
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"https://www.youtube.com/watch?v=%s&t=%s"
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"Format string for `org-yt-format-open-url' to fill in ID and TIMING.")
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(defconst org-yt-chunk
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"https://www.youtube.com/embed/%s?autoplay=1&start=%d&end=%d"
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"Format string for `org-yt-format-open-url' to fill in ID and TIMING.")
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(defun org-yt-format-open-url (id timing)
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"Convert an \"yt\" type link to an URL for opening."
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(cond
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((not timing)
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(format org-yt-start id "0s"))
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((length= timing 1)
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(format org-yt-start id
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(org-yt-seconds-to-hms (org-yt-time-to-seconds (car timing)))))
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((length= timing 2)
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(format org-yt-chunk id
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(org-yt-time-to-seconds (car timing))
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(org-yt-time-to-seconds (cadr timing))))))
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#+end_src
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#+caption[Formatting function for HTML export of =org-yt= links]:
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#+caption: Formatting function for HTML export of =org-yt= links.
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#+name: lst:org-yt-html-export-formatting
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#+begin_src emacs-lisp -n :results silent
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(defconst org-yt-iframe
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"<iframe
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frameborder=\"0\" width=\"600\" height=\"450\"
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src=\"https://www.youtube.com/embed/%s%s\"
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title=\"%s\"
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allowfullscreen></iframe>"
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"Format string for `org-yt-iframe' to fill in ID, TIMING, and TITLE.")
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(defun org-yt-format-iframe (id timing title)
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"Convert an \"yt\" type link to an inline frame element for export to HTML."
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(format org-yt-iframe id
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(cond
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((not timing) "")
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((length= timing 1)
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(format "?start=%d" id (org-yt-time-to-seconds (car timing))))
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((length= timing 2)
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(format "?start=%d&end=%d"
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(org-yt-time-to-seconds (car timing))
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(org-yt-time-to-seconds (cadr timing)))))
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title))
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#+end_src
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#+caption[Define an =org-link= type for =YouTube=]:
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#+caption: Define an =org-link= type for =YouTube=.
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#+name: lst:define-org-yt-link-type
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#+begin_src emacs-lisp -n :results silent
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(defun org-yt-open (path prefix)
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"Open an \"yt\" type link with `browse-url', `emms', or \"mpv\".
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PATH is a string containing the video ID and optional timing information.
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Open the link with `browse-url' if PREFIX else with `emms' or \"mpv\"."
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(let* ((parts (split-string path "[#]+" t))
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(id (car parts))
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(timing (cdr parts))
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(url (org-yt-format-open-url id timing)))
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(cond
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(prefix
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(browse-url url))
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((require 'emms nil 'noerror)
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(emms-add-url url)
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(with-current-emms-playlist
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(save-excursion
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(emms-playlist-last)
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(emms-playlist-mode-play-current-track))))
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((executable-find "mpv")
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(let ((display-buffer-alist
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`((,shell-command-buffer-name-async . (display-buffer-no-window)))))
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(async-shell-command (format "\"%s\" \"%s\"" url)))
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(message "Launched mpv with \"%s\"" url))
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(t
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(user-error "Can't open `%s': install `emms' and/or `mpv'" url)))))
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;; https://bitspook.in/blog/extending-org-mode-to-handle-youtube-paths/
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(defun org-yt-emms-open (path)
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"Open an \"YouTube\" link with `emms' using \"mpv\"."
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(let ((url (format "https://www.youtube.com/watch?v=%s" path)))
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(require 'emms nil 'noerror)
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(emms-add-url url)
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(with-current-emms-playlist
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(save-excursion
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(emms-playlist-last)
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(emms-playlist-mode-play-current-track)))))
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(defun org-yt-url-browse-open (path)
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"Open an \"YouTube\" link with `url-browse'."
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(let ((url (format "https://www.youtube.com/watch?v=%s" path)))
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(browse-url url)))
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(defun org-yt-export (path desc backend _)
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"Export an \"yt\" type link."
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(let* ((parts (split-string path "[#]+" t))
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(id (car parts))
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(timing (cdr parts)))
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(pcase backend
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"Export an \"YouTube\" link."
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(pcase backend
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(`html
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(org-yt-format-iframe id timing desc))
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(format "<iframe
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frameborder=\"0\" width=\"600\" height=\"450\"
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src=\"https://www.youtube.com/embed/%s\"
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title=\"%s\"
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allowfullscreen></iframe>" path desc))
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(`latex
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(format "\\href{%s}{%s}" (org-yt-format-open-url id timing) desc))
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(_ id))))
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(format "\\href{https://www.youtube.com/watch?v=%s}{%s}" path desc))
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(_ path)))
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(with-eval-after-load 'ol
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;; https://bitspook.in/blog/extending-org-mode-to-handle-youtube-paths/
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(org-link-set-parameters "yt"
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:follow #'org-yt-open
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:export #'org-yt-export))
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(org-link-set-parameters
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"yt" :follow #'org-yt-emms-open :export #'org-yt-export))
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#+end_src
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*** [[https://tecosaur.github.io/emacs-config/#translate-capital-keywords][Translate capital keywords (old) to lower case (new)]]
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