MPD: joystick and interrupt handling

mpd_dot3k.py

@@ -1,8 +1,16 @@
 #!/usr/bin/env python3
 
+# Author: raspbeguy <raspbeguy@hashtagueule.fr>
+# 2017-03-12
+# License: MIT
+
 import queue
 import threading
+import signal
+import sys
 import dot3k.lcd as lcd
+import dot3k.backlight as backlight
+import dot3k.joystick as nav
 from mpd import MPDClient
 
 rotate_pause = 10 # delay in rotation steps
@@ -57,7 +65,7 @@ def display():
     album = ''
     song_file = '' # Useful to determine if current song actually changed
     step_title = step_artist = step_album = 0
-    while True:
+    while run_event.is_set():
         try:
             arg = q.get(timeout=0.2)
             status = arg['status']['state']
@@ -69,18 +77,17 @@ def display():
             else:
                 lcd.create_char(0, char_stop)
 
-            if song_file != arg['song']['file']:
+            if status not in {'play','pause'} or song_file != arg['song']['file']:
-                song_file   = arg['song']['file']
+                song_file   = arg['song']['file'] if 'file' in  arg['song'].keys() else ''
-                title       = arg['song']['title']
+                title       = arg['song']['title'] if 'title' in  arg['song'].keys() else ''
-                artist      = arg['song']['artist']
+                artist      = arg['song']['artist'] if 'artist' in  arg['song'].keys() else ''
-                album       = arg['song']['album']
+                album       = arg['song']['album'] if 'album' in  arg['song'].keys() else ''
+                lcd.clear()
+                lcd.set_cursor_position(0, 0)
+                lcd.write(chr(0))
 
                 step_title = step_artist = step_album = 0
                 delay_title = delay_artist = delay_album = rotate_pause
-                lcd.clear()
-
-                lcd.set_cursor_position(0, 0)
-                lcd.write(chr(0))
 
                 if len(title) <= 15:
                     lcd.set_cursor_position(1, 0)
@@ -93,24 +100,27 @@ def display():
                     lcd.write(album)
 
         except queue.Empty:
-            if step_title == 0 and delay_title > 0:
+            if len(title) > 15:
-                delay_title -= 1
+                if step_title == 0 and delay_title > 0:
-            else:
+                    delay_title -= 1
-                step_title = (step_title + 1) % (len(title) + 3)
+                else:
-                if delay_title == 0:
+                    step_title = (step_title + 1) % (len(title) + 3)
-                    delay_title = rotate_pause
+                    if delay_title == 0:
-            if step_artist == 0 and delay_artist > 0:
+                        delay_title = rotate_pause
-                delay_artist -= 1
+            if len(artist) > 16:
-            else:
+                if step_artist == 0 and delay_artist > 0:
-                step_artist = (step_artist + 1) % (len(artist) + 3)
+                    delay_artist -= 1
-                if delay_title == 0:
+                else:
-                    delay_artist = rotate_pause
+                    step_artist = (step_artist + 1) % (len(artist) + 3)
-            if step_album == 0 and delay_album > 0:
+                    if delay_artist == 0:
-                delay_album -= 1
+                        delay_artist = rotate_pause
-            else:
+            if len(album) > 16:
-                step_album  = (step_album + 1) % (len(album) + 3)
+                if step_album == 0 and delay_album > 0:
-                if delay_title == 0:
+                    delay_album -= 1
-                    delay_album = rotate_pause
+                else:
+                    step_album  = (step_album + 1) % (len(album) + 3)
+                    if delay_album == 0:
+                        delay_album = rotate_pause
 
         if len(title) > 15:
             lcd.set_cursor_position(1, 0)
@@ -121,14 +131,53 @@ def display():
         if len(album) > 16:
             lcd.set_cursor_position(0, 2)
             lcd.write(stringrotate(album, 16, step_album))
+    lcd.clear()
 
+@nav.on(nav.BUTTON)
+def button_center(pin):
+    client = MPDClient() # Please close your eyes
+    client.connect("localhost", 6600) # Dirty dirty dirty...
+    if client.status()['state'] in {'play','pause'}:
+        client.pause()
+    else:
+        client.play()
+    client.close() # Okay, you can open your eyes
 
+@nav.on(nav.LEFT)
+def button_left(pin):
+    client = MPDClient() # Please close your eyes
+    client.connect("localhost", 6600) # Dirty dirty dirty...
+    client.previous()
+    client.close() # Okay, you can open your eyes
+
+@nav.on(nav.RIGHT)
+def button_right(pin):
+    client = MPDClient() # Please close your eyes
+    client.connect("localhost", 6600) # Dirty dirty dirty...
+    client.next()
+    client.close() # Okay, you can open your eyes
+
+def on_exit(sig, func=None):
+    run_event.clear()
+    t_display.join()
+    backlight.rgb(0, 0, 0)
+    backlight.rgb(0, 0, 0)
+    print("Screen sound be blank and light off now.")
+    sys.exit(0)
+
+backlight.rgb(55, 55, 55)
+run_event = threading.Event()
+run_event.set()
 client = MPDClient()
 client.connect("localhost", 6600)
 
 t_display = threading.Thread(name='display',target=display)
 t_display.start()
 
-while True:
+signal.signal(signal.SIGTERM, on_exit)
-    q.put({'song': client.currentsong(), 'status' : client.status()})
+try:
-    client.idle('player')
+    while True:
+        q.put({'song': client.currentsong(), 'status' : client.status()})
+        client.idle('player')
+except KeyboardInterrupt:
+    on_exit(None)