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;;; emms-tag-tracktag.el --- EMMS interface for audiotools tracktag -*- lexical-binding: t; -*-
;; Copyright (C) 2021 Free Software Foundation, Inc.
;; Author: Grant Shoshin Shangreaux <grant@churls.world>
;; Keywords:
;; This program 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.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Provides a wrapper for audiotools tracktag executable
;; http://audiotools.sourceforge.net/tracktag.html
;; Given an EMMS TRACK structure, it will map the emms-info fields onto
;; arguments for tracktag. Then it calls the tracktag process to write the
;; info as metadata tags on the track's associated file.
;;; Code:
(require 'emms)
(defvar emms-tag-tracktag--info-fields
'((info-artist . artist)
(info-composer . composer)
(info-performer . performer)
(info-title . name)
(info-album . album)
(info-tracknumber . number)
(info-discnumber . album-number)
(info-year . year)
(info-date . date)
(info-note . comment))
"An alist mapping info-* fields to tracktag fields.")
(defvar emms-tag-tracktag-log-buffer "*EMMS-LOG*"
"Name of emms-tag-tracktag's log buffer.
Defaults to the same value as emms-tag-editor-log-buffer")
(defun emms-tag-tracktag--map-track-info (track)
(seq-filter (lambda (cell) (cdr cell))
(mapcar (lambda (pair)
(cons (cdr pair) (emms-track-get track (car pair))))
emms-tag-tracktag--info-fields)))
(defun emms-tag-tracktag--build-args (track)
(flatten-list
(append
(mapcar (lambda (pair)
(let ((tag (car pair)) (value (cdr pair)))
(when value
;; if we've deleted a tag value in the editor, remove the tag from file metadata.
(if (string-equal "" value) (concat "--remove-" (format "%s" tag))
(concat "--" (format "%s" tag) "=" value)))))
(emms-tag-tracktag--map-track-info track))
(list (emms-track-name track)))))
(defun emms-tag-tracktag-file (track)
(apply #'call-process
"tracktag" nil
(get-buffer-create emms-tag-tracktag-log-buffer)
nil
"-Vdebug"
(emms-tag-tracktag--build-args track)))
(provide 'emms-tag-tracktag)
;;; emms-tag-tracktag.el ends here
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