client-barcode: Turn off console echo (experiment for now, idea by Andy Gunschl)

client-barcode/freitagskasse.py

@@ -19,6 +19,8 @@ import os
 import time
 import urllib2
 import select
+import termios
+import atexit
 
 from display import Display
 from thread import start_new_thread, allocate_lock
@@ -458,8 +460,25 @@ def read_line(f, timeout, timeout_func):
 		return ''
 
 
+def enable_echo(fd, enabled):
+	(iflag, oflag, cflag, lflag, ispeed, ospeed, cc) = termios.tcgetattr(fd)
+	if enabled:
+		lflag |= termios.ECHO
+	else:
+		lflag &= ~termios.ECHO
+	new_attr = [iflag, oflag, cflag, lflag, ispeed, ospeed, cc]
+	termios.tcsetattr(fd, termios.TCSANOW, new_attr)
+
+
 def main():
+	debugging = bool(os.environ.get('BARCODE_PLUGIN_DEBUG', False))
+
 	colorama.init()
+
+	if not debugging:
+		atexit.register(enable_echo, sys.stdin.fileno(), True)
+		enable_echo(sys.stdin.fileno(), False)
+
 	status = Status()
 	global scroll_line1,scroll_line2
 	global myDisplay
@@ -474,7 +493,8 @@ def main():
 	while True:
 		clear()
 		status.dump()
-		print_prompt()
+		if debugging:
+			print_prompt()
 		line = read_line(sys.stdin, timeout=3*60.0, timeout_func=status.logout)
 		if line:
 			myDisplay.write('\x0cRFID/Barcode:\n%20s' % line[:20])