add is_segwit_mode() utility function

jmclient/jmclient/__init__.py

@@ -26,7 +26,7 @@ from .cryptoengine import BTCEngine, BTC_P2PKH, BTC_P2SH_P2WPKH, EngineError
 from .configure import (
     load_program_config, get_p2pk_vbyte, jm_single, get_network,
     validate_address, get_irc_mchannels, get_blockchain_interface_instance,
-    get_p2sh_vbyte, set_config)
+    get_p2sh_vbyte, set_config, is_segwit_mode)
 from .blockchaininterface import (BlockchainInterface, sync_wallet,
                                   RegtestBitcoinCoreInterface, BitcoinCoreInterface)
 from .electruminterface import ElectrumInterface

jmclient/jmclient/configure.py

@@ -414,3 +414,7 @@ def get_blockchain_interface_instance(_config):
     else:
         raise ValueError("Invalid blockchain source")
     return bc_interface
+
+
+def is_segwit_mode():
+    return jm_single().config.get('POLICY', 'segwit') != 'false'