add shutdown effect:

system shutdown is disabled by default. enable it in json (set false to true)
the shutdown is abortable. simply select another effect before shutdown time reached
this effect is made for linux and did not workl on windows without modifications


Former-commit-id: 32f92246fbc87de576e4b1059dd319646917ec74

effects/shutdown.json

@@ -0,0 +1,11 @@
+{
+	"name"   : "System Shutdown",
+	"script" : "shutdown.py",
+	"args"   :
+	{
+		"speed"            : 1.2,
+		"alarm-color"      : [255,0,0],
+		"post-color"       : [255,174,11],
+		"shutdown-enabled" : false
+	}
+}

effects/shutdown.py

@@ -0,0 +1,51 @@
+import hyperion, time, colorsys, random, subprocess
+
+def setPixel(x,y,rgb):
+	global imageData, width
+	offset = y*width*3 + x*3
+	if offset+2 < len(imageData):
+		imageData[offset]   = rgb[0]
+		imageData[offset+1] = rgb[1]
+		imageData[offset+2] = rgb[2]
+
+# Initialize the led data and args
+sleepTime      = float(hyperion.args.get('speed', 1.0))*0.5
+alarmColor     = hyperion.args.get('alarm-color', (255,0,0))
+postColor      = hyperion.args.get('post-color', (255,174,11))
+off            = bool(hyperion.args.get('shutdown-enabled', False))
+width          = 12
+height         = 10
+
+imageData      = bytearray(height * width * (0,0,0))
+imageDataBlack = bytearray(height * width * (0,0,0))
+imageDataRed   = bytearray(height * width * alarmColor)
+
+# Start the write data loop
+for i in range(6):
+	if hyperion.abort():
+		off = False
+		break
+	if i % 2:
+		hyperion.setImage(width, height, imageDataRed)
+	else:
+		hyperion.setImage(width, height, imageDataBlack)
+	time.sleep(sleepTime)
+
+for y in range(height,0,-1):
+	if hyperion.abort():
+		off = False
+		break
+	for x in range(width):
+		setPixel(x, y-1, alarmColor)
+	hyperion.setImage(width, height, imageData)
+	time.sleep(sleepTime)
+time.sleep(1)
+
+for y in range(height):
+	for x in range(width):
+		setPixel(x, y, postColor)
+hyperion.setImage(width, height, imageData)
+time.sleep(2)
+
+if off and not hyperion.abort():
+	subprocess.call("halt")