Emacs user interface for Music Player Daemon (https://www.musicpd.org/), a flexible, powerful, server-side application for playing music.
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;;; mpdel-playlist.el --- Display and manipulate MPD playlists -*- lexical-binding: t; -*-
;; Copyright (C) 2017-2020 Damien Cassou
;; Author: Damien Cassou <damien@cassou.me>
;; Keywords: multimedia
;; Url: https://gitea.petton.fr/mpdel/mpdel
;; Package-requires: ((emacs "25.1"))
;; Version: 1.0.0
;; 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:
;; Let the user view and manipulate MPD's current playlist and stored
;; playlists.
;;; Code:
(require 'mpdel-core)
(require 'mpdel-tablist)
;;; Customization
(defgroup mpdel-playlist nil
"Display and manipulate MPD playlists."
:group 'libmpdel)
(defface mpdel-playlist-current-song-face
'((t . (:inherit font-lock-keyword-face)))
"Face to highlight current song in playlist."
:group 'mpdel-playlist)
;;; `navigel' major-mode configuration
(navigel-method mpdel navigel-entity-tablist-mode ((_entity (eql current-playlist)))
(mpdel-playlist-current-playlist-mode))
(navigel-method mpdel navigel-entity-tablist-mode ((_entity libmpdel-stored-playlist))
(mpdel-playlist-stored-playlist-mode))
(navigel-method mpdel navigel-delete ((songs list) &context (major-mode mpdel-playlist-mode) &optional _callback)
(libmpdel-playlist-delete songs navigel-entity))
;;; Private functions
(defun mpdel-playlist--highlight ()
"Highlight currently played song in current buffer."
(save-excursion
(when (navigel-go-to-entity (libmpdel-current-song))
(let ((inhibit-read-only t))
(put-text-property (line-beginning-position) (line-end-position)
'face 'mpdel-playlist-current-song-face)))))
;;; Private functions
(defun mpdel-playlist--register-to-hooks ()
"Register to several hooks to refresh automatically refresh the current buffer.."
(let ((buffer (current-buffer)))
(let* ((refresh-fn (lambda ()
(with-current-buffer buffer
(navigel-refresh))))
(playlist navigel-entity)
(hooks (if (libmpdel-stored-playlist-p playlist)
'(libmpdel-stored-playlist-changed-hook)
'(libmpdel-current-playlist-changed-hook
libmpdel-current-song-changed-hook
libmpdel-player-changed-hook))))
(dolist (hook hooks)
(add-hook hook refresh-fn))
(add-hook 'kill-buffer-hook
(lambda () (dolist (hook hooks) (remove-hook hook refresh-fn)))
nil t))))
;;; Public functions
;;;###autoload
(defun mpdel-playlist-open ()
"Display the current playlist."
(interactive)
(mpdel-core-open 'current-playlist))
(define-key mpdel-core-map (kbd "l") #'mpdel-playlist-open)
;;;###autoload
(defun mpdel-playlist-open-stored-playlist ()
"Ask for a stored playlist and open it."
(interactive)
(libmpdel-funcall-on-stored-playlist #'mpdel-core-open))
(defun mpdel-playlist-play ()
"Start playing the song at point."
(interactive)
(if (derived-mode-p 'mpdel-playlist-current-playlist-mode)
(libmpdel-play-song (navigel-entity-at-point))
(mpdel-core-insert-current-playlist)))
(defun mpdel-playlist-move-up ()
"Move selected songs up in the current playlist."
(interactive)
(let ((songs (mpdel-core-selected-entities)))
(when songs
(libmpdel-playlist-move-up songs))))
(defun mpdel-playlist-move-down ()
"Move selected songs down in the current playlist."
(interactive)
(let ((songs (mpdel-core-selected-entities)))
(when songs
(libmpdel-playlist-move-down songs))))
(defun mpdel-playlist-save ()
"Save current playlist into a new stored playlist.
Ask for stored playlist name."
(interactive)
(if (libmpdel-current-playlist-p navigel-entity)
(call-interactively #'libmpdel-playlist-save)
(user-error "You can only save from the current playlist")))
;;; Modes
(defvar mpdel-playlist-mode-map
(let ((map (make-sparse-keymap)))
map)
"Keybindings for `mpdel-playlist-mode'.")
(define-derived-mode mpdel-playlist-mode mpdel-tablist-mode "MPDel Playlist"
(add-hook 'navigel-init-done-hook #'mpdel-playlist--register-to-hooks nil t))
(defvar mpdel-playlist-current-playlist-mode-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "<M-up>") #'mpdel-playlist-move-up)
(define-key map (kbd "<M-down>") #'mpdel-playlist-move-down)
(define-key map (kbd "C-x C-s") #'mpdel-playlist-save)
(define-key map (kbd "P") #'mpdel-playlist-play)
map)
"Keybindings for `mpdel-playlist-current-playlist-mode'.")
(define-derived-mode mpdel-playlist-current-playlist-mode mpdel-playlist-mode "MPDel Current playlist"
"Major mode to display the current playlist."
(add-hook 'navigel-changed-hook #'mpdel-playlist--highlight nil t))
(defvar mpdel-playlist-stored-playlist-mode-map
(let ((map (make-sparse-keymap)))
map)
"Keybindings for `mpdel-playlist-stored-playlist-mode'.")
(define-derived-mode mpdel-playlist-stored-playlist-mode mpdel-playlist-mode "MPDel Stored playlist"
"Major mode to display a stored playlist.")
(provide 'mpdel-playlist)
;;; mpdel-playlist.el ends here