Emacs library to communicate with Music Player Daemon (MPD, https://www.musicpd.org/), a flexible, powerful, server-side application for playing music.
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;;; libmpdel-directory.el --- Handling directories -*- lexical-binding: t; -*-
;; Copyright (C) 2019 Damien Cassou
;; Author: Jose A Ortega <jao@gnu.org>
;; Keywords: multimedia
;; Url: https://gitea.petton.fr/mpdel/libmpdel
;; Package-requires: ((emacs "25.1"))
;; Version: 1.2.0
;; 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:
;; This module implements the directory datatype, used to traverse
;; local or virtual directories (collections) in MPD servers.
;;; Code:
(require 'libmpdel)
(require 'cl-lib)
(cl-defstruct (libmpdel-directory
(:constructor libmpdel--directory-create)
(:conc-name libmpdel--directory-))
(path nil :read-only t)
(name nil :read-only t))
(cl-defmethod libmpdel-entity-name ((_entity (eql directories)))
"The name for the `directories' entity."
"Directories")
(cl-defmethod libmpdel-entity-to-criteria ((_entity (eql directories)))
"Return a query to retrieve the list of directories from the server."
"lsinfo \"\"")
(defun libmpdel-directory--create-directories-from-data (data)
"Return a list of directories extracted from DATA returned by MPD."
(mapcar (lambda (dir-name) (libmpdel--directory-create :path dir-name))
(libmpdel-sorted-entries data 'directory)))
(cl-defmethod libmpdel-list ((_entity (eql directories)) function)
"Call FUNCTION with a list of directories as argument."
(libmpdel-send-command
(libmpdel-entity-to-criteria 'directories)
(lambda (data)
(funcall function
(libmpdel-directory--create-directories-from-data data)))))
(cl-defmethod libmpdel-entity-name ((dir libmpdel-directory))
"Return DIR's entity name."
(or (libmpdel--directory-name dir)
(file-name-nondirectory (or (libmpdel--directory-path dir) ""))))
(cl-defmethod libmpdel-entity-id ((dir libmpdel-directory))
"Return DIR's entity identifier."
(libmpdel--directory-path dir))
(eval-when-compile
(declare-function dired-jump "dired-x"))
(cl-defmethod libmpdel-dired ((dir libmpdel-directory))
"Jump, using dired, to DIR's local directory."
(require 'dired-x)
(dired-jump t (expand-file-name (libmpdel--directory-path dir)
libmpdel-music-directory)))
(cl-defmethod libmpdel-entity-parent ((dir libmpdel-directory))
"Return the directory containing DIR, or 'directories."
(let ((path (file-name-directory (libmpdel--directory-path dir))))
(if (> (length path) 1)
(libmpdel--directory-create :path (substring path 0 -1))
'directories)))
(cl-defmethod libmpdel-entity-to-criteria ((dir libmpdel-directory))
"Return a search criteria to list the contents of DIR, as a string."
(format "lsinfo %S" (libmpdel--directory-path dir)))
(defun libmpdel-directory--make-dots (dir)
"Return a list of the . and .. entries associated with the given DIR."
(list
(libmpdel--directory-create :path (libmpdel--directory-path dir) :name ".")
(let ((parent (libmpdel-entity-parent dir)))
(if (libmpdel-directory-p parent)
(libmpdel--directory-create :path (libmpdel--directory-path parent)
:name "..")
parent))))
(cl-defmethod libmpdel-list ((dir libmpdel-directory) function)
"Call FUNCTION with all the entities contained in DIR."
(libmpdel-send-command
(libmpdel-entity-to-criteria dir)
(lambda (data)
(let* ((dirs (libmpdel-directory--create-directories-from-data data))
(songs (libmpdel--create-songs-from-data data))
(songs (cl-remove-if-not 'libmpdel-entity-name songs))
(all (append (libmpdel-directory--make-dots dir) dirs songs)))
(funcall function all)))))
(cl-defmethod libmpdel-playlist-add ((dir libmpdel-directory) playlist)
"Add the entities contained in DIR (that is, its children) to PLAYLIST."
(libmpdel-list dir (lambda (children)
(libmpdel-playlist-add (cddr children) playlist))))
(provide 'libmpdel-directory)
;;; libmpdel-directory.el ends here