fix command line interface for hardware wallets. fixes #3056

plugins/ledger/cmdline.py

@@ -1,20 +1,11 @@
 from electrum.util import print_msg
 from .ledger import LedgerPlugin
-
-class BTChipCmdLineHandler:
-    def stop(self):
-        pass
-
-    def show_message(self, msg):
-        print_msg(msg)
-
-    def prompt_auth(self, msg):
-        import getpass
-        print_msg(msg)
-        response = getpass.getpass('')
-        if len(response) == 0:
-            return None
-        return response
+from ..hw_wallet import CmdLineHandler
 
 class Plugin(LedgerPlugin):
-    handler = BTChipCmdLineHandler()
+    handler = CmdLineHandler()
+    @hook
+    def init_keystore(self, keystore):
+        if not isinstance(keystore, self.keystore_class):
+            return
+        keystore.handler = self.handler