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;;; emms-metaplaylist-mode.el --- A major mode for lists of Emms playlists -*- lexical-binding: t; -*-
;; Copyright (C) 2006, 2007, 2008, 2009, 2017-2018 Free Software Foundation, Inc.
;; Author: Yoni Rabkin <yrk@gnu.org>
;; This file is part of EMMS.
;; 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; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
;; 02110-1301, USA.
;;; Commentary:
;;
;; `emms-metaplaylist-mode' creates an interactive list of all the
;; Emms playlist buffers. The currently active buffer is
;; highlighted. You can choose a buffer from the list with RET and get
;; taken there.
;;; Code:
(require 'emms)
(require 'emms-playlist-mode)
;;; --------------------------------------------------------
;;; Variables, customisation and faces
;;; --------------------------------------------------------
(defgroup emms-metaplaylist-mode nil
"*The Emacs Multimedia System meta-playlist mode."
:prefix "emms-metaplaylist-mode-"
:group 'multimedia)
(defcustom emms-metaplaylist-mode-buffer-name "*Emms Playlist Buffers*"
"*Name of the buffer in which Emms playlists will be listed."
:type 'string
:group 'emms-metaplaylist-mode)
(defcustom emms-metaplaylist-mode-hooks nil
"*List of hooks to run on entry to emms-metaplaylist-mode."
:type 'list
:group 'emms-metaplaylist-mode)
(defface emms-metaplaylist-mode-face
'((((class color) (background dark))
(:foreground "AntiqueWhite3"))
(((class color) (background light))
(:foreground "red3"))
(((type tty) (class mono))
(:inverse-video t))
(t (:background "WhiteSmoke")))
"Face for the buffer names in the playlists buffer."
:group 'emms-metaplaylist-mode)
(defface emms-metaplaylist-mode-current-face
'((((class color) (background dark))
(:foreground "red2"))
(((class color) (background light))
(:background "red3" :foreground "white"))
(((type tty) (class mono))
(:inverse-video t))
(t (:background "red3")))
"Face for the current buffer name in the playlists buffer."
:group 'emms-metaplaylist-mode)
;;; --------------------------------------------------------
;;; Keymap
;;; --------------------------------------------------------
(defvar emms-metaplaylist-mode-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map text-mode-map)
(define-key map (kbd "n") 'next-line)
(define-key map (kbd "p") 'previous-line)
(define-key map (kbd "RET") 'emms-metaplaylist-mode-goto-current)
(define-key map (kbd "SPC") 'emms-metaplaylist-mode-set-active)
(define-key map (kbd "g") 'emms-metaplaylist-mode-update)
(define-key map (kbd "C") 'emms-metaplaylist-mode-new-buffer)
(define-key map (kbd "C-k") 'emms-metaplaylist-mode-kill-buffer)
(define-key map (kbd "c") 'emms-metaplaylist-mode-center-current)
(define-key map (kbd "q") 'kill-this-buffer)
(define-key map (kbd "?") 'describe-mode)
map)
"Keymap for `emms-metaplaylist-mode'.")
;;; --------------------------------------------------------
;;; Metaplaylist
;;; --------------------------------------------------------
(defun emms-metaplaylist-mode-goto-current ()
"Switch to the buffer at point."
(interactive)
(let ((buffer (get-buffer
(buffer-substring (point-at-bol)
(point-at-eol)))))
(emms-playlist-set-playlist-buffer buffer)
(switch-to-buffer buffer)))
(defun emms-metaplaylist-mode-write (playlists)
"Print the sorted list of PLAYLISTS."
(delete-region (point-min) (point-max))
(mapc (lambda (buf)
(let ((inhibit-read-only t))
(insert (buffer-name buf))
(add-text-properties
(point-at-bol) (point-at-eol)
(list 'face
(if (eq buf emms-playlist-buffer)
'emms-metaplaylist-mode-current-face
'emms-metaplaylist-mode-face)))
(newline)))
playlists))
;; Emms' list changes order, and that's OK, but we want something
;; stable for display purposes.
(defun emms-metaplaylist-mode-sorted-buffer-list ()
"Return a sorted list of playlist buffers."
(sort
(copy-tree
(emms-playlist-buffer-list))
#'(lambda (a b)
(string< (buffer-name a)
(buffer-name b)))))
(defun emms-metaplaylist-mode-center-current ()
"Center on the current playlist buffer"
(interactive)
(when (buffer-name emms-playlist-buffer)
(let ((p nil))
(save-excursion
(goto-char (point-min))
(setq p (search-forward-regexp (regexp-quote
(buffer-name emms-playlist-buffer))
(point-max) t)))
(when (not p) (error "cannot not find the current playlist buffer"))
(goto-char p)
(goto-char (point-at-bol)))))
(defun emms-metaplaylist-mode-create ()
"Create the meta-playlist buffer."
(let ((name emms-metaplaylist-mode-buffer-name)
(playlists (emms-metaplaylist-mode-sorted-buffer-list)))
(if playlists
(with-current-buffer (get-buffer-create name)
(emms-metaplaylist-mode)
(emms-metaplaylist-mode-write playlists)
(emms-metaplaylist-mode-center-current)
(current-buffer))
(error "No Emms playlist buffers"))))
(defun emms-metaplaylist-mode-assert-buffer ()
"Assert that we are in the metaplaylist mode buffer."
(when (not (eq (current-buffer)
(get-buffer emms-metaplaylist-mode-buffer-name)))
(error "not the metalplaylist buffer")))
(defun emms-metaplaylist-mode-update ()
"Update the metalplaylist display."
(interactive)
(emms-metaplaylist-mode-assert-buffer)
(let ((inhibit-read-only t))
(emms-metaplaylist-mode-write
(emms-metaplaylist-mode-sorted-buffer-list)))
(emms-metaplaylist-mode-center-current))
(defun emms-metaplaylist-mode-kill-buffer ()
"Kill the buffer at point"
(interactive)
(let ((buffer (get-buffer
(buffer-substring (point-at-bol)
(point-at-eol)))))
(when (not buffer)
(error "can't find buffer at point"))
(if (y-or-n-p (format "kill playlist buffer \"%s\"?"
(buffer-name buffer)))
(kill-buffer buffer)
(message "Buffer kill aborted."))
(emms-metaplaylist-mode-update)))
;;; --------------------------------------------------------
;;; Playlist Management
;;; --------------------------------------------------------
(defun emms-metaplaylist-mode-new-buffer (buffer-name)
"Creates a new buffer playlist buffer BUFFER-NAME."
(interactive "sBuffer Name: ")
(if (get-buffer buffer-name)
(error "Buffer must not exist.")
(let ((buf (get-buffer-create buffer-name)))
(with-current-buffer buf
(emms-playlist-mode)
(setq emms-playlist-buffer-p t)))
(emms-metaplaylist-mode-update)))
(defun emms-metaplaylist-mode-set-active ()
"Set the buffer at point to be the active playlist."
(interactive)
(emms-playlist-set-playlist-buffer
(get-buffer (buffer-substring (point-at-bol) (point-at-eol))))
(emms-metaplaylist-mode-update))
;;; --------------------------------------------------------
;;; Mode entry
;;; --------------------------------------------------------
(defun emms-metaplaylist-mode-go ()
"Single entry point to the metaplaylist interface."
(interactive)
(let ((mpm-buffer (get-buffer emms-metaplaylist-mode-buffer-name)))
(if mpm-buffer
(with-current-buffer mpm-buffer
(emms-metaplaylist-mode-update))
(setq mpm-buffer (emms-metaplaylist-mode-create)))
(switch-to-buffer mpm-buffer)))
(defun emms-metaplaylist-mode ()
"A major mode for Emms playlists.
\\{emms-metaplaylist-mode-map}"
;; (interactive)
(kill-all-local-variables)
(use-local-map emms-metaplaylist-mode-map)
(setq major-mode 'emms-metaplaylist-mode
mode-name "Emms-MetaPlaylist")
(setq buffer-read-only t)
(run-hooks 'emms-metaplaylist-mode-hooks))
(provide 'emms-metaplaylist-mode)
;;; emms-metaplaylist-mode.el ends here
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