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;;; emms-pbi-filter.el --- Filtering functions for the PBI
;; Copyright (C) 2004 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 way to filter the playlist to only show
;; certain parts of a big playlist, and only play after those.
;;; Code:
(require 'emms-pbi)
(defvar emms-pbi-not-filtered nil
"A list of trackindexes in `emms-playlist' that aren't filtered
out.")
(defun emms-pbi-filter-region (beg end)
"Hide the lines spanning the region from BEG to END."
(interactive "r")
(save-excursion
(set-buffer emms-pbi-playlist-buffer-name)
(goto-char beg)
(let ((startofregion (point-at-bol)))
(goto-char end)
(let ((endofregion (point-at-eol)))
(let ((hideoverlay (make-overlay startofregion endofregion))
(newlineoverlay (make-overlay (- startofregion 1) startofregion))
(intangibleoverlay (make-overlay (- startofregion 1) (+ endofregion 1))))
(overlay-put newlineoverlay 'after-string "\n")
(overlay-put newlineoverlay 'invisible t)
(overlay-put newlineoverlay 'emms-id 'emms-pbi-filter-overlay)
(overlay-put intangibleoverlay 'intangible t)
(overlay-put intangibleoverlay 'emms-id 'emms-pbi-filter-overlay)
(overlay-put hideoverlay 'emms-id 'emms-pbi-filter-overlay)
(overlay-put hideoverlay 'invisible t))))))
(defun emms-pbi-unfilter-region (beg end)
"Show all hidden lines between BEG and END."
(interactive "r")
(let ((overlays (overlays-in beg end)))
(while overlays
(when (equal (overlay-get (car overlays) 'emms-id) 'emms-pbi-filter-overlay)
(delete-overlay (car overlays)))
(setq overlays (cdr overlays)))))
(provide 'emms-pbi-filter)
;;; emms-pbi-filter.el ends here
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