modify typing pool to deal with DOS-ish barcode scanners

screenless/bureau/typing.py

@@ -67,6 +67,7 @@ class TypingPool(Bureau):
     def run_io(self):
         val = ""
         upper = False
+        ctrl = False
         #TODO: this is crap, needs to be multi-threaded and have one
         #      such loop for each active device
         self.active_devices[0].grab()
@@ -74,7 +75,7 @@ class TypingPool(Bureau):
         for ev in self.active_devices[0].read_loop():
             if ev.type == evdev.ecodes.EV_KEY:
                 data = evdev.categorize(ev)
-                if data.keystate == 1:
+                if data.keystate == 1:  # key-down
                     if data.scancode == 28:
                         print("sending barcode:", val)
                         self.send(val[0:2], val[2:])
@@ -82,15 +83,27 @@ class TypingPool(Bureau):
                     else:
                         try:
                             new_key = KEYS[data.scancode]
-                            if new_key == "LSHFT" or new_key == "RSHFT":
+                            if ctrl and (new_key == "j"):
+                                self.log.debug("ignoring line-feed")
+                            elif new_key == "LSHFT" or new_key == "RSHFT":
                                 upper = True
+                            elif new_key == "LCTRL" or new_key == "RCTRL":
+                                ctrl = True
                             else:
                                 if upper:
                                     new_key = new_key.upper()
-                                    upper = False
                                 val += new_key
                         except KeyError:
                             print("Error invalid keycode:", data.scancode)
+                if data.keystate == 0:  # key-up for mod-keys
+                        try:
+                            new_key = KEYS[data.scancode]
+                            if new_key == "LSHFT" or new_key == "RSHFT":
+                                upper = False
+                            if new_key == "LCTRL" or new_key == "RCTRL":
+                                ctrl = False
+                        except KeyError:
+                            print("Error invalid keycode:", data.scancode)
 
 
 def main():