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;;; emms-info-ytdl.el --- info-method for EMMS using ytdl -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Free Software Foundation, Inc.
;; Author: Yuchen Pei (ycp@gnu.org)
;; Keywords: multimedia
;; EMMS is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; EMMS is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
;; License for more details.
;; You should have received a copy of the GNU General Public License
;; along with EMMS; see the file COPYING.. If not, see
;; <https://www.gnu.org/licenses/>.
;;; Commentary:
;; (add-to-list emms-info-functions 'emms-info-ytdl)
;; To use this you would need to have `emms-info-ytdl-command`
;; (typically youtube-dl or yt-dlp) installed on your system.
;;; Code:
(require 'emms-info)
(require 'json)
(defgroup emms-info-ytdl nil
"Options for EMMS."
:group 'emms-info)
(defvar emms-info-ytdl-field-map
'((info-title . title)
(info-artist . artist)
(info-playing-time . duration))
"Mapping for ytdl output.")
(defvar emms-info-ytdl-regexp
"^https?://"
"Regexp to use ytdl to get info.")
(defvar emms-info-ytdl-exclude-regexp
"\\(\\.\\w+$\\|/playlist\\|/channel\\)"
"Regexp not to use ytdl to get info.")
(defvar emms-info-ytdl-command
"youtube-dl"
"Command to run for emms-info-ytdl.")
(defun emms-info-ytdl (track)
"Set TRACK info using ytdl."
(when (and (eq (emms-track-type track) 'url)
(string-match emms-info-ytdl-regexp (emms-track-name track))
(not
(string-match emms-info-ytdl-exclude-regexp
(emms-track-name track))))
(with-temp-buffer
(when (zerop
(let ((coding-system-for-read 'utf-8))
(call-process emms-info-ytdl-command nil '(t nil) nil
"-j" (emms-track-name track))))
(goto-char (point-min))
(condition-case nil
(let ((json-fields (json-read)))
(mapc
(lambda (field-map)
(let ((emms-field (car field-map))
(ytdl-field (cdr field-map)))
(let ((track-field (assoc ytdl-field json-fields)))
(when track-field
(emms-track-set
track
emms-field
(if (eq emms-field 'info-playing-time)
(truncate (cdr track-field))
(cdr track-field)))))))
emms-info-ytdl-field-map))
(error (message "error while reading track info")))
track))))
(provide 'emms-info-ytdl)
;;; emms-info-ytdl.el ends here
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