Added configuration option: DISPLAY_IN_TERMINAL

This allows you to turn of displaying the data to the terminal if your
using glucose-monitor with a Raspberry Pi display.

main.py

@@ -208,6 +208,7 @@ def main():
         delay = DEFAULT_INTERVAL
 
     show_on_screen = False
+    show_in_terminal = True
     if 'SCREEN' in config:
         if 'TYPE' not in config['SCREEN']:
             logging.fatal("no screen type in config file")
@@ -262,6 +263,11 @@ def main():
             def clear_display():
                 display.clear()
 
+        if "DISPLAY_IN_TERMINAL" in config['SCREEN']:
+            if config['SCREEN']['DISPLAY_IN_TERMINAL'].lower() == "false":
+                show_in_terminal = False
+
+
     libreview_session = LibreViewSession()
     libreview_session.authenticate(config['CREDENTIALS']['EMAIL'], config['CREDENTIALS']['PASSWORD'])
 
@@ -289,12 +295,13 @@ def main():
         if not SHOULD_EXIT and not first_run:
             time.sleep(delay)
         elif first_run:
-            first_run = False
+            if show_in_terminal:
+                clear_terminal()
 
-        clear_terminal()
+            if show_on_screen:
+                clear_display()
 
-        if show_on_screen:
-            clear_display()
+            first_run = False
 
         try:
             graph = libreview_session.getGraph(patient_id)
@@ -314,12 +321,19 @@ def main():
             logging.error("the data returned from the API was not in an expected format")
             continue
 
+        if show_on_screen:
+            clear_display()
+
         glucoseMeasurement = graph['connection']['glucoseMeasurement']
 
-        print("Timestamp:    ", glucoseMeasurement['Timestamp'], "\n")
-        print("Glucose units:",glucoseMeasurement['Value'])
-        print("Is high:      ", glucoseMeasurement['isHigh'])
-        print("Is low:       ", glucoseMeasurement['isLow'])
+        if show_in_terminal:
+            clear_terminal()
+
+            print(f"Timestamp:     {glucoseMeasurement['Timestamp']}\n")
+            print(f"Glucose units: {glucoseMeasurement['Value']}")
+            print(f"Is high:       {glucoseMeasurement['isHigh']}")
+            print(f"Is low:        {glucoseMeasurement['isLow']}")
+            print(f"Refresh rate:  {delay} seconds")
 
         if show_on_screen:
             draw.text((x, top), glucoseMeasurement['Timestamp'], font=font, fill=255)