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;;; emms-pbi-mark.el --- Mark-functions for the EMMS playlist
;; Copyright (C) 2003 Free Software Foundation, Inc.
;; Author: Ulrik Jensen <terryp@daimi.au.dk>
;; Keywords:
;; This file 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 2, or (at your option)
;; any later version.
;; This file 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;; Boston, MA 02110-1301 USA
;;; Commentary:
;; This file provides a mark-facility for the EMMS playlist-buffer
;; interface.
;; To use it, add:
;; (require 'emms-pbi-mark)
;; (emms-pbi-mark 1)
;; To your ~/.emacs.
;;; Code:
;; $Revision: 1.7 $
;; $Id: emms-pbi-mark.el,v 1.7 2005/07/09 11:56:00 forcer Exp $
;; Customs
(defgroup emms-pbi-mark nil
"Marking utilities for the EMMS playlist"
:prefix "emms-pbi-mark-"
:group 'emms-pbi)
(defface emms-pbi-mark-marked-face
'((((class color))
(:foreground "green" :weight bold)))
"Face used for marked files"
:group 'emms-pbi-mark)
;; variables
(defvar emms-pbi-mark-indices nil
"A list containing the indices of the marked elements.")
;; Entry
(defun emms-pbi-mark (arg)
"Activate mark-mode for the EMMS-playlist."
(interactive "p")
(if (and arg (< 0 arg))
(progn
(add-hook 'emms-pbi-current-line-face-changed-hook 'emms-pbi-add-mark-face)
(add-hook 'emms-playlist-changed-hook 'emms-pbi-mark-invalidate-marks)
(add-hook 'emms-pbi-mode-hook 'emms-pbi-mark-add-keybindings))
(remove-hook 'emms-pbi-current-line-face-changed-hook 'emms-pbi-add-mark-face)
(remove-hook 'emms-pbi-mode-hook 'emms-pbi-mark-add-keybindings)
(remove-hook 'emms-playlist-changed-hook 'emms-pbi-mark-invalidate-marks)))
(defun emms-pbi-mark-invalidate-marks ()
"Force a reset of marked tracks."
(when (get-buffer emms-pbi-playlist-buffer-name)
(emms-pbi-mark-clear-marked))
(setq emms-pbi-mark-indices nil))
(defun emms-pbi-mark-add-keybindings ()
"Adds keybindings for the mark-functions to a *Playlist* buffer."
(local-set-key (kbd "m") 'emms-pbi-mark-mark-file)
(local-set-key (kbd "M-u") 'emms-pbi-mark-clear-marked)
(local-set-key (kbd "u") 'emms-pbi-mark-unmark-file))
(defun emms-pbi-mark-current-line-marked-p ()
"Return non-nil if the current line is marked, nil otherwise."
(let ((idx (emms-pbi-return-current-line-index)))
(if (not idx)
nil
(member idx emms-pbi-mark-indices))))
(defun emms-pbi-mark-current-line-mark ()
"Mark the current line."
(let ((idx (emms-pbi-return-current-line-index)))
(when (emms-pbi-valid-index-p idx)
(add-to-list 'emms-pbi-mark-indices idx)
(emms-pbi-add-mark-face))))
(defun emms-pbi-mark-current-line-unmark ()
"Unmark the current line."
(let ((idx (emms-pbi-return-current-line-index)))
(when (and (emms-pbi-valid-index-p idx)
(emms-pbi-mark-current-line-marked-p))
(setq emms-pbi-mark-indices (remove idx emms-pbi-mark-indices))
(emms-pbi-remove-mark-face))))
(defun emms-pbi-add-mark-face ()
"Add a face to the current line, if it is marked."
(when (emms-pbi-mark-current-line-marked-p)
(put-text-property (point-at-bol) (point-at-eol) 'face 'emms-pbi-mark-marked-face)))
(defun emms-pbi-remove-mark-face ()
"Remove the marked-face from the current-line, if it's no longer
marked."
(when (not (emms-pbi-mark-current-line-marked-p))
(let ((inhibit-read-only t))
(remove-text-properties (point-at-bol) (point-at-eol) '(face))
(emms-pbi-add-properties-current-line))))
;; Programming interface functions
(defun emms-pbi-mark-get-marked ()
"Return a list of tracks marked in the playlist"
(let ((indices emms-pbi-mark-indices)
(tracks nil))
(while indices
(let ((idx (car indices)))
(when (emms-pbi-valid-index-p idx)
(add-to-list 'tracks (emms-playlist-get-track idx))))
(setq indices (cdr indices)))
tracks))
;; User Interface functions
(defun emms-pbi-mark-clear-marked ()
"Clear all marks from the playlist-buffer"
(interactive)
(save-excursion
(set-buffer (get-buffer emms-pbi-playlist-buffer-name))
(let ((indices emms-pbi-mark-indices)
(tracks nil))
(while emms-pbi-mark-indices
(let ((idx (car emms-pbi-mark-indices)))
(when (emms-pbi-valid-index-p idx)
(goto-line (1+ idx))
(emms-pbi-mark-current-line-unmark)))))))
(defun emms-pbi-mark-mark-file (arg)
"Marks the current line in the playlist.
With prefix argument, mark the following ARG lines."
(interactive "p")
(let ((marksleft arg)
(inhibit-read-only t))
(while (> marksleft 0)
(emms-pbi-mark-current-line-mark)
(forward-line 1)
(setq marksleft (1- marksleft)))))
(defun emms-pbi-mark-unmark-file (arg)
"Removes a mark from the current line in the playlist.
With prefix argument, unmark the following ARG lines."
(interactive "p")
(let ((marksleft arg)
(inhibit-read-only t))
(while (> marksleft 0)
(emms-pbi-mark-current-line-unmark)
(forward-line 1)
(setq marksleft (1- marksleft)))))
(provide 'emms-pbi-mark)
;;; emms-pbi-mark.el ends here
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