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+;;; emms-playlist-mode.el --- Playlist mode for Emms.
+
+;; Copyright (C) 2005-2019  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, 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:
+;;;
+;;; This is a method of displaying and manipulating the different Emms
+;;; playlist buffers.
+;;;
+;;; Emms developer's motto: "When forcer says (require 'jump) we say
+;;; (funcall #'jump height)"
+
+;;; Code:
+
+;;; --------------------------------------------------------
+;;; Variables
+;;; --------------------------------------------------------
+
+(require 'emms)
+(condition-case nil
+    (require 'overlay)
+  (error nil))
+(require 'emms-source-playlist)
+
+(defvar emms-playlist-mode-hook nil
+  "Emms playlist mode hook.")
+
+(defvar emms-playlist-mode-selected-overlay nil
+  "Last selected track.  Use for updating the display.")
+
+(defvar emms-playlist-mode-switched-buffer nil
+  "Last buffer visited before calling `emms-playlist-mode-switch-buffer'.")
+
+(defvar emms-playlist-mode-popup-enabled nil
+  "True when the playlist was called as a popup window.")
+
+(defvar emms-playlist-mode-kill-whole-line-p t
+  "When true line kills behave like a typical music player.")
+
+(make-variable-buffer-local
+ 'emms-playlist-mode-selected-overlay)
+
+(defgroup emms-playlist-mode nil
+  "*The Emacs Multimedia System playlist mode."
+  :prefix "emms-playlist-mode-"
+  :group 'emms)
+
+(defcustom emms-playlist-mode-open-playlists nil
+  "*Determine whether to open playlists in a new EMMS buffer on RET.
+This is useful if you have a master playlist buffer that is
+composed of other playlists."
+  :type 'boolean
+  :group 'emms-playlist-mode)
+
+(defcustom emms-playlist-mode-window-width 25
+  "*Determine the width of the Emms popup window.
+The value should a positive integer."
+  :type 'integer
+  :group 'emms-playlist-mode)
+
+(defcustom emms-playlist-mode-center-when-go nil
+  "*Determine whether to center on the currently selected track.
+This is true for every invocation of `emms-playlist-mode-go'."
+  :type 'boolean
+  :group 'emms-playlist-mode)
+
+;;; --------------------------------------------------------
+;;; Faces
+;;; --------------------------------------------------------
+
+(defface emms-playlist-track-face
+  '((((class color) (background dark))
+     (:foreground "DarkSeaGreen"))
+    (((class color) (background light))
+     (:foreground "Blue"))
+    (((type tty) (class mono))
+     (:inverse-video t))
+    (t (:background "Blue")))
+  "Face for the tracks in a playlist buffer."
+  :group 'emms-playlist-mode)
+
+(defface emms-playlist-selected-face
+  '((((class color) (background dark))
+     (:foreground "SteelBlue3"))
+    (((class color) (background light))
+     (:background "blue3" :foreground "white"))
+    (((type tty) (class mono))
+     (:inverse-video t))
+    (t (:background "blue3")))
+  "Face for highlighting the selected track."
+  :group 'emms-playlist-mode)
+
+;;; --------------------------------------------------------
+;;; Keys
+;;; --------------------------------------------------------
+
+(defvar emms-playlist-mode-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map text-mode-map)
+    (define-key map (kbd "C-x C-s") 'emms-playlist-save)
+    (define-key map (kbd "C-y") 'emms-playlist-mode-yank)
+    (define-key map (kbd "C-k") 'emms-playlist-mode-kill-track)
+    (define-key map (kbd "C-w") 'emms-playlist-mode-kill)
+    (define-key map (kbd "C-_") 'emms-playlist-mode-undo)
+    (define-key map (kbd "C-/") 'emms-playlist-mode-undo)
+    (define-key map (kbd "C-x u") 'emms-playlist-mode-undo)
+    (define-key map (kbd "C-n") 'next-line)
+    (define-key map (kbd "C-p") 'previous-line)
+    (define-key map (kbd "C-j") 'emms-playlist-mode-insert-newline)
+    (define-key map (kbd "M-y") 'emms-playlist-mode-yank-pop)
+    (define-key map (kbd "M-<") 'emms-playlist-mode-first)
+    (define-key map (kbd "M->") 'emms-playlist-mode-last)
+    (define-key map (kbd "M-n") 'emms-playlist-mode-next)
+    (define-key map (kbd "M-p") 'emms-playlist-mode-previous)
+    (define-key map (kbd "a") 'emms-playlist-mode-add-contents)
+    (define-key map (kbd "b") 'emms-playlist-set-playlist-buffer)
+    (define-key map (kbd "D") 'emms-playlist-mode-kill-track)
+    (define-key map (kbd "n") 'emms-next)
+    (define-key map (kbd "p") 'emms-previous)
+    (define-key map (kbd "SPC") 'scroll-up)
+    (define-key map (kbd ">") 'emms-seek-forward)
+    (define-key map (kbd "<") 'emms-seek-backward)
+    (define-key map (kbd "P") 'emms-pause)
+    (define-key map (kbd "s") 'emms-stop)
+    (define-key map (kbd "f") 'emms-show)
+    (define-key map (kbd "c") 'emms-playlist-mode-center-current)
+    (define-key map (kbd "q") 'emms-playlist-mode-bury-buffer)
+    (define-key map (kbd "K") 'emms-playlist-mode-current-kill)
+    (define-key map (kbd "?") 'describe-mode)
+    (define-key map (kbd "r") 'emms-random)
+    (define-key map (kbd "C") 'emms-playlist-clear)
+    (define-key map (kbd "d") 'emms-playlist-mode-goto-dired-at-point)
+    (define-key map (kbd "<mouse-2>") 'emms-playlist-mode-play-current-track)
+    (define-key map (kbd "RET") 'emms-playlist-mode-play-smart)
+    map)
+  "Keymap for `emms-playlist-mode'.")
+
+(defmacro emms-playlist-mode-move-wrapper (name fun)
+  "Create a function NAME which is an `interactive' version of FUN.
+
+NAME should be a symbol.
+FUN should be a function."
+  `(defun ,name ()
+     ,(format "Interactive wrapper around `%s' for playlist-mode."
+	      fun)
+     (interactive)
+     (,fun)))
+
+(emms-playlist-mode-move-wrapper emms-playlist-mode-first
+				 emms-playlist-first)
+
+(emms-playlist-mode-move-wrapper emms-playlist-mode-select-next
+				 emms-playlist-next)
+
+(emms-playlist-mode-move-wrapper emms-playlist-mode-select-previous
+				 emms-playlist-previous)
+
+(defun emms-playlist-mode-bury-buffer ()
+  "Wrapper around `bury-buffer' for popup windows."
+  (interactive)
+  (if emms-playlist-mode-popup-enabled
+      (unwind-protect
+	  (delete-window)
+	(setq emms-playlist-mode-popup-enabled nil))
+    (bury-buffer)))
+
+(defun emms-playlist-mode-current-kill ()
+  "If the current buffer is an EMMS playlist buffer, kill it.
+Otherwise, kill the current EMMS playlist buffer."
+  (interactive)
+  (if (and emms-playlist-buffer-p
+           (not (eq (current-buffer) emms-playlist-buffer)))
+      (kill-buffer (current-buffer))
+    (emms-playlist-current-kill)))
+
+(defun emms-playlist-mode-last ()
+  "Move to directly after the last track in the current buffer."
+  (interactive)
+  (emms-playlist-ensure-playlist-buffer)
+  (let ((last (condition-case nil
+                  (save-excursion
+                    (goto-char (point-max))
+                    (point))
+                (error
+                 nil))))
+    (if last
+        (goto-char last)
+      (error "No last track"))))
+
+(defun emms-playlist-mode-center-current ()
+  "Move point to the currently selected track."
+  (interactive)
+  (goto-char (if emms-playlist-mode-selected-overlay
+                 (overlay-start emms-playlist-mode-selected-overlay)
+               (point-min))))
+
+(defun emms-playlist-mode-play-current-track ()
+  "Start playing track at point."
+  (interactive)
+  (emms-playlist-set-playlist-buffer (current-buffer))
+  (unless (emms-playlist-track-at (point))
+    (emms-playlist-next))
+  (emms-playlist-select (point))
+  (when emms-player-playing-p
+    (emms-stop))
+  (emms-start))
+
+(defun emms-playlist-mode-play-smart ()
+  "Determine the best operation to take on the current track.
+
+If on a playlist, and `emms-playlist-mode-open-playlists' is
+non-nil, load the playlist at point into a new buffer.
+
+Otherwise play the track immediately."
+  (interactive)
+  (save-excursion
+    ;; move to the start of the line, in case the point is on the \n,
+    ;; which isn't propertized
+    (emms-move-beginning-of-line nil)
+    (if (not emms-playlist-mode-open-playlists)
+        (emms-playlist-mode-play-current-track)
+      (unless (emms-playlist-track-at)
+        (emms-playlist-next))
+      (let* ((track (emms-playlist-track-at))
+             (name (emms-track-get track 'name))
+             (type (emms-track-get track 'type)))
+        (if (or (eq type 'playlist)
+                (and (eq type 'file)
+                     (string-match "\\.\\(m3u\\|pls\\)\\'" name)))
+            (emms-playlist-mode-load-playlist)
+          (emms-playlist-mode-play-current-track))))))
+
+(defun emms-playlist-mode-switch-buffer ()
+  "Switch to the playlist buffer and then switch back if called again.
+
+This function switches to the current Emms playlist buffer and
+remembers the buffer switched from. When called again the
+function switches back to the remembered buffer."
+  (interactive)
+  (if (eq (current-buffer)
+	  emms-playlist-buffer)
+      (switch-to-buffer emms-playlist-mode-switched-buffer)
+    (setq emms-playlist-mode-switched-buffer (current-buffer))
+    (switch-to-buffer emms-playlist-buffer)))
+
+(defun emms-playlist-mode-insert-newline ()
+  "Insert a newline at point."
+  (interactive)
+  (emms-with-inhibit-read-only-t
+   (newline)))
+
+(defun emms-playlist-mode-undo ()
+  "Wrapper around `undo'."
+  (interactive)
+  (emms-with-inhibit-read-only-t
+   (undo)))
+
+(defun emms-playlist-mode-add-contents ()
+  "Add files in the playlist at point to the current playlist buffer.
+
+If we are in the current playlist, make a new playlist buffer and
+set it as current."
+  (interactive)
+  (save-excursion
+    (emms-move-beginning-of-line nil)
+    (unless (emms-playlist-track-at)
+      (emms-playlist-next))
+    (let* ((track (emms-playlist-track-at))
+           (name (emms-track-get track 'name))
+           (type (emms-track-get track 'type))
+           (playlist-p (or (eq type 'playlist)
+                           (and (eq type 'file)
+                                (save-match-data
+                                  (string-match "\\.\\(m3u\\|pls\\)\\'"
+                                                name))))))
+      (emms-playlist-select (point))
+      (unless (and (buffer-live-p emms-playlist-buffer)
+                   (not (eq (current-buffer) emms-playlist-buffer)))
+        (setq emms-playlist-buffer
+              (emms-playlist-set-playlist-buffer (emms-playlist-new))))
+      (with-current-emms-playlist
+        (goto-char (point-max))
+        (when playlist-p
+          (insert (emms-track-force-description track) "\n"))
+        (let ((beg (point)))
+          (if playlist-p
+              (emms-add-playlist name)
+            (let ((func (intern (concat "emms-add-" (symbol-name type)))))
+              (if (functionp func)
+                  (funcall func name)
+                ;; fallback
+                (emms-add-file name))))
+          (when playlist-p
+            (goto-char (point-max))
+            (while (progn
+                     (forward-line -1)
+                     (>= (point) beg))
+              (insert "  ")))
+          (goto-char (point-min))
+          (message "Added %s" (symbol-name type)))))))
+
+(defun emms-playlist-mode-goto-dired-at-point ()
+  "Visit the track at point in a `dired' buffer."
+  (interactive)
+  (let ((track (emms-playlist-track-at)))
+    (if track
+	(let ((name (emms-track-get track 'name))
+	      (type (emms-track-get track 'type)))
+	  (if (eq type 'file)
+	      (dired (file-name-directory name))
+	    (error "Can't visit this track type in Dired")))
+      (error "No track at point"))))
+
+;;; --------------------------------------------------------
+;;; Killing and yanking
+;;; --------------------------------------------------------
+
+(defun emms-playlist-mode-between-p (p a b)
+  "Return t if P is a point between points A and B."
+  (and (<= a p)
+       (<= p b)))
+
+;; D
+(defun emms-playlist-mode-kill-entire-track ()
+  "Kill track at point, including newline."
+  (interactive)
+  (let ((kill-whole-line t))
+    (emms-playlist-mode-kill-track)))
+
+;; C-k
+(defun emms-playlist-mode-kill-track ()
+  "Kill track at point."
+  (interactive)
+  (emms-with-inhibit-read-only-t
+   (let ((track (emms-playlist-track-at)))
+     (when track
+       (let ((track-region (emms-property-region (point)
+						 'emms-track)))
+	 (when (and emms-player-playing-p
+		    (emms-playlist-selected-track-at-p))
+	   (emms-stop)
+	   (delete-overlay emms-playlist-mode-selected-overlay)
+	   (setq emms-playlist-mode-selected-overlay nil))))
+     (let ((kill-whole-line emms-playlist-mode-kill-whole-line-p))
+       (goto-char (point-at-bol))
+       (kill-line)))))
+
+;; C-w
+(defun emms-playlist-mode-kill ()
+  "Kill from mark to point."
+  (interactive)
+  (emms-with-inhibit-read-only-t
+   ;; Are we killing the playing/selected track?
+   (when (and (markerp emms-playlist-selected-marker)
+              (emms-playlist-mode-between-p
+               (marker-position emms-playlist-selected-marker)
+               (region-beginning)
+               (region-end)))
+     (emms-stop)
+     (delete-overlay emms-playlist-mode-selected-overlay)
+     (setq emms-playlist-mode-selected-overlay nil))
+   (kill-region (region-beginning)
+                (region-end))))
+
+(defun emms-playlist-mode-correct-previous-yank ()
+  "Fix the previous yank if needed."
+  (when (and (< (point-at-bol) (point))
+	     (< (point) (point-at-eol)))
+    (newline)))
+
+;; C-y
+(defun emms-playlist-mode-yank ()
+  "Yank into the playlist buffer."
+  (interactive)
+  (emms-with-inhibit-read-only-t
+   (goto-char (point-at-bol))
+   (yank)
+   (emms-playlist-mode-correct-previous-yank)))
+
+;; M-y
+(defun emms-playlist-mode-yank-pop ()
+  "Cycle through the kill-ring."
+  (interactive)
+  (emms-with-inhibit-read-only-t
+   (yank-pop nil)
+   (emms-playlist-mode-correct-previous-yank)))
+
+;;; --------------------------------------------------------
+;;; Overlay
+;;; --------------------------------------------------------
+
+(defun emms-playlist-mode-overlay-selected ()
+  "Place an overlay over the currently selected track."
+  (when emms-playlist-selected-marker
+    (save-excursion
+      (goto-char emms-playlist-selected-marker)
+      (let ((reg (emms-property-region (point) 'emms-track)))
+        (if emms-playlist-mode-selected-overlay
+            (move-overlay emms-playlist-mode-selected-overlay
+                          (car reg)
+                          (cdr reg))
+          (setq emms-playlist-mode-selected-overlay
+                (make-overlay (car reg)
+                              (cdr reg)
+                              nil t nil))
+          (overlay-put emms-playlist-mode-selected-overlay
+                       'face 'emms-playlist-selected-face)
+          (overlay-put emms-playlist-mode-selected-overlay
+                       'evaporate t))))))
+
+;;; --------------------------------------------------------
+;;; Saving/Restoring
+;;; --------------------------------------------------------
+
+(defun emms-playlist-mode-open-buffer (filename)
+  "Opens a previously saved playlist buffer.
+
+It creates a buffer called \"filename\", and restores the contents
+of the saved playlist inside."
+  (interactive "fFile: ")
+  (let* ((s)
+	 (buffer (get-buffer-create filename))
+	 (name   (buffer-name buffer)))
+    (with-current-buffer buffer
+      (emms-insert-file-contents filename)
+      (setq s (read (buffer-string))))
+    (kill-buffer buffer)
+    (with-current-buffer (emms-playlist-new name)
+      (emms-with-inhibit-read-only-t
+       (insert s)
+       (goto-char (point-min))
+       (emms-walk-tracks
+         (emms-playlist-update-track)))
+      (emms-playlist-first)
+      (emms-playlist-select (point))
+      (switch-to-buffer (current-buffer)))))
+
+(defun emms-playlist-mode-load-playlist ()
+  "Load the playlist into a new EMMS buffer.
+This preserves the current EMMS buffer."
+  (interactive)
+  (let* ((track (emms-playlist-track-at))
+         (name (emms-track-get track 'name))
+         (type (emms-track-get track 'type)))
+    (emms-playlist-select (point))
+    (run-hooks 'emms-player-stopped-hook)
+    (switch-to-buffer
+     (emms-playlist-set-playlist-buffer (emms-playlist-new)))
+    (emms-add-playlist name)))
+
+;;; --------------------------------------------------------
+;;; Local functions
+;;; --------------------------------------------------------
+
+(defun emms-playlist-mode-insert-track (track &optional no-newline)
+  "Insert the description of TRACK at point.
+When NO-NEWLINE is non-nil, do not insert a newline after the track."
+  (emms-playlist-ensure-playlist-buffer)
+  (emms-with-inhibit-read-only-t
+   (insert (emms-propertize (emms-track-force-description track)
+                            'emms-track track
+                            'face 'emms-playlist-track-face))
+   (when (emms-playlist-selected-track-at-p)
+     (emms-playlist-mode-overlay-selected))
+   (unless no-newline
+     (insert "\n"))))
+
+(defun emms-playlist-mode-update-track-function ()
+  "Update the track display at point."
+  (emms-playlist-ensure-playlist-buffer)
+  (emms-with-inhibit-read-only-t
+   (let ((track-region (emms-property-region (point)
+					     'emms-track))
+	 (track (get-text-property (point)
+				   'emms-track))
+	 (selectedp (emms-playlist-selected-track-at-p)))
+     (save-excursion
+       (delete-region (car track-region)
+		      (cdr track-region))
+       (when selectedp
+	 (delete-overlay emms-playlist-mode-selected-overlay)
+	 (setq emms-playlist-mode-selected-overlay nil))
+       (emms-playlist-mode-insert-track track t))
+     (when selectedp
+       (emms-playlist-select (point))))))
+
+;;; --------------------------------------------------------
+;;; Entry
+;;; --------------------------------------------------------
+
+(defun emms-playlist-mode-go ()
+  "Switch to the current emms-playlist buffer and use emms-playlist-mode."
+  (interactive)
+  (if (or (null emms-playlist-buffer)
+	  (not (buffer-live-p emms-playlist-buffer)))
+      (error "No current Emms buffer")
+    (switch-to-buffer emms-playlist-buffer)
+    (when (and (not (eq major-mode 'emms-playlist-mode))
+	       emms-playlist-buffer-p)
+      (emms-playlist-mode))
+    (when emms-playlist-mode-center-when-go
+      (emms-playlist-mode-center-current))))
+
+(defun emms ()
+  "Switch to the current emms-playlist buffer, use
+emms-playlist-mode and query for a directory tree to add to the
+playlist."
+  (interactive)
+  (if (or (null emms-playlist-buffer)
+	  (not (buffer-live-p emms-playlist-buffer)))
+      (call-interactively 'emms-add-directory))
+  (emms-playlist-mode-go))
+
+(defun emms-playlist-mode-go-popup (&optional window-width)
+  "Popup emms-playlist buffer as a side window.
+
+Default value for WINDOW-WIDTH is `emms-playlist-mode-window-width'.
+WINDOW-WIDTH should be a positive integer."
+  (interactive)
+  (setq emms-playlist-mode-window-width
+        (round (or window-width emms-playlist-mode-window-width)))
+  (split-window-horizontally (- emms-playlist-mode-window-width))
+  (other-window 1)
+  (emms-playlist-mode-go)
+  (setq emms-playlist-mode-popup-enabled t))
+
+(defun emms-playlist-mode-next (arg)
+  "Navigate between playlists."
+  (interactive "p")
+  (let ((playlists (emms-playlist-buffer-list))
+        bufs idx)
+    (if playlists
+        ;; if not in playlist mode, switch to emms-playlist-buffer
+        (if (not (member (current-buffer) playlists))
+            (switch-to-buffer (if (and emms-playlist-buffer
+                                       (buffer-live-p emms-playlist-buffer))
+                                  emms-playlist-buffer
+                                (car playlists)))
+          (setq bufs (member (current-buffer) playlists))
+          (setq idx
+                (+ (- (length playlists) (length bufs))
+                   (if (> arg 0) 1 -1)))
+          (switch-to-buffer (nth (mod idx (length playlists)) playlists)))
+      (message "No playlist found!"))))
+(defun emms-playlist-mode-previous (arg)
+  (interactive "p")
+  (emms-playlist-mode-next (- arg)))
+
+(defun emms-playlist-mode-startup ()
+  "Instigate emms-playlist-mode on the current buffer."
+  ;; when there is neither a current emms track or a playing one...
+  (when (not (or emms-playlist-selected-marker
+		 emms-player-playing-p))
+    ;; ...then stop the player.
+    (emms-stop)
+    ;; why select the first track?
+    (when emms-playlist-buffer-p
+      (emms-playlist-select-first)))
+  ;; when there is a selected track.
+  (when emms-playlist-selected-marker
+    (emms-playlist-mode-overlay-selected))
+  (emms-with-inhibit-read-only-t
+   (add-text-properties (point-min)
+                        (point-max)
+                        '(face emms-playlist-track-face)))
+  (setq buffer-read-only t)
+  (setq truncate-lines t)
+  (setq buffer-undo-list nil))
+
+;;;###autoload
+(defun emms-playlist-mode ()
+  "A major mode for Emms playlists.
+\\{emms-playlist-mode-map}"
+  (interactive)
+  (let ((val emms-playlist-buffer-p))
+    (kill-all-local-variables)
+    (setq emms-playlist-buffer-p val))
+
+  (use-local-map emms-playlist-mode-map)
+  (setq major-mode 'emms-playlist-mode
+	mode-name "EMMS")
+
+  (setq emms-playlist-insert-track-function
+	'emms-playlist-mode-insert-track)
+  (setq emms-playlist-update-track-function
+	'emms-playlist-mode-update-track-function)
+  (add-hook 'emms-playlist-selection-changed-hook
+	    'emms-playlist-mode-overlay-selected)
+
+  (emms-playlist-mode-startup)
+
+  (run-hooks 'emms-playlist-mode-hook))
+
+(provide 'emms-playlist-mode)
+
+;;; emms-playlist-mode.el ends here