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+;;; emms-last-played.el --- Support for last-played-time of a track
+
+;; Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+
+;; Author: Lucas Bonnet <lucas@rincevent.net>
+;; Keywords: emms, mp3, mpeg, multimedia
+
+;; 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; Records when the track was last played.
+;; Big portions of the time handling fuctions are copied from
+;; gnus-util.el, and slightly adapted.
+
+;;; Code:
+
+(require 'emms)
+
+(defvar emms-last-played-keep-count t
+  "Specifies if EMMS should record the number of times you play a track.
+Set it to t if you want such a feature, and to nil if you don't.")
+
+(defvar emms-last-played-format-alist
+  '(((emms-last-played-seconds-today) . "%k:%M")
+    (604800 . "%a %k:%M")                   ;;that's one week
+    ((emms-last-played-seconds-month) . "%a %d")
+    ((emms-last-played-seconds-year) . "%b %d")
+    (t . "%b %d '%y"))                      ;;this one is used when no
+					    ;;other does match
+  "Specifies date format depending on when a track was last played.
+This is an alist of items (AGE . FORMAT).  AGE can be a number (of
+seconds) or a Lisp expression evaluating to a number.  When the age of
+the track is less than this number, then use `format-time-string'
+with the corresponding FORMAT for displaying the date of the track.
+If AGE is not a number or a Lisp expression evaluating to a
+non-number, then the corresponding FORMAT is used as a default value.
+
+Note that the list is processed from the beginning, so it should be
+sorted by ascending AGE.  Also note that items following the first
+non-number AGE will be ignored.
+
+You can use the functions `emms-last-played-seconds-today',
+`emms-last-played-seconds-month' and
+`emms-last-played-seconds-year' in the AGE spec.  They return the
+number of seconds passed since the start of today, of this month,
+of this year, respectively.")
+
+
+(defun emms-last-played-update-track (track)
+  "Updates the last-played time of TRACK."
+  (emms-track-set track 'last-played (current-time)))
+
+(defun emms-last-played-increment-count (track)
+  "Increments the play-count property of TRACK.
+If non-existent, it is set to 1."
+  (let ((play-count (emms-track-get track 'play-count)))
+    (if play-count
+        (emms-track-set track 'play-count (1+ play-count))
+      (emms-track-set track 'play-count 1))))
+
+(defun emms-last-played-update-current ()
+  "Updates the current track."
+  (emms-last-played-update-track (emms-playlist-current-selected-track))
+  (if emms-last-played-keep-count
+      (emms-last-played-increment-count (emms-playlist-current-selected-track))))
+
+(defun emms-last-played-seconds-today ()
+  "Return the number of seconds passed today."
+  (let ((now (decode-time (current-time))))
+    (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600))))
+
+(defun emms-last-played-seconds-month ()
+  "Return the number of seconds passed this month."
+  (let ((now (decode-time (current-time))))
+    (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600)
+       (* (- (car (nthcdr 3 now)) 1) 3600 24))))
+
+(defun emms-last-played-seconds-year ()
+  "Return the number of seconds passed this year."
+  (let ((now (decode-time (current-time)))
+	(days (format-time-string "%j" (current-time))))
+    (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600)
+       (* (- (string-to-number days) 1) 3600 24))))
+
+(defun emms-last-played-format-date (messy-date)
+  "Format the messy-date according to emms-last-played-format-alist.
+Returns \"  ?  \" if there's bad input or if an other error occurs.
+Input should look like this: \"Sun, 14 Oct 2001 13:34:39 +0200\"."
+  (condition-case ()
+      (let* ((messy-date (float-time messy-date))
+             (now (float-time (current-time)))
+	     ;;If we don't find something suitable we'll use this one
+	     (my-format "%b %d '%y"))
+	(let* ((difference (- now messy-date))
+	       (templist emms-last-played-format-alist)
+	       (top (eval (caar templist))))
+	  (while (if (numberp top) (< top difference) (not top))
+	    (progn
+	      (setq templist (cdr templist))
+	      (setq top (eval (caar templist)))))
+	  (if (stringp (cdr (car templist)))
+	      (setq my-format (cdr (car templist)))))
+	(format-time-string (eval my-format) (seconds-to-time messy-date)))
+    (error "Never.")))
+
+(provide 'emms-last-played)
+;;; emms-last-played.el ends here