Add preview script.

Update issue #459
Basic script added.

scripts/preview/main.py

@@ -0,0 +1,41 @@
+import clementine
+
+from PyQt4.QtCore import QTimer
+from PyQt4.QtGui import QAction
+
+class Plugin:
+  def __init__(self):
+    self.timer = QTimer(None)
+    self.timer.setInterval(10000)
+    self.timer.timeout.connect(self.Timeout)
+    self.timer.setSingleShot(True)
+    self.action = QAction("Preview mode", None)
+    self.action.setCheckable(True)
+    self.action.triggered.connect(self.Enabled)
+    clementine.ui.AddAction("playlist_menu", self.action)
+    clementine.player.Playing.connect(self.Playing)
+    clementine.player.Paused.connect(self.Stopped)
+    clementine.player.Stopped.connect(self.Stopped)
+    self.enabled = False
+
+  def Enabled(self, enabled):
+    self.enabled = enabled
+    if enabled:
+      if clementine.player.GetState() == 2:  # Playing
+        self.timer.start()
+    else:
+      self.timer.stop()
+
+  def Playing(self):
+    if self.enabled:
+      self.timer.start()
+
+  def Stopped(self):
+    self.timer.stop()
+
+  def Timeout(self):
+    if clementine.player.GetState() == 2:
+      clementine.player.Next()
+
+
+plugin = Plugin()

scripts/preview/script.ini

@@ -0,0 +1,8 @@
+[Script]
+name=Preview
+description=Adds an option to preview songs.
+author=John Maguire <john.maguire@gmail.com>
+url=http://www.clementine-player.org
+
+language=python
+script_file=main.py