wizard: make native segwit (bech32) the default for bip39/hw

electrum/base_wizard.py

@@ -334,12 +334,14 @@ class BaseWizard(object):
             # There is no general standard for HD multisig.
             # For legacy, this is partially compatible with BIP45; assumes index=0
             # For segwit, a custom path is used, as there is no standard at all.
+            default_choice_idx = 2
             choices = [
                 ('standard',   'legacy multisig (p2sh)',            "m/45'/0"),
                 ('p2wsh-p2sh', 'p2sh-segwit multisig (p2wsh-p2sh)', purpose48_derivation(0, xtype='p2wsh-p2sh')),
                 ('p2wsh',      'native segwit multisig (p2wsh)',    purpose48_derivation(0, xtype='p2wsh')),
             ]
         else:
+            default_choice_idx = 2
             choices = [
                 ('standard',    'legacy (p2pkh)',            bip44_derivation(0, bip43_purpose=44)),
                 ('p2wpkh-p2sh', 'p2sh-segwit (p2wpkh-p2sh)', bip44_derivation(0, bip43_purpose=49)),
@@ -349,7 +351,8 @@ class BaseWizard(object):
             try:
                 self.choice_and_line_dialog(
                     run_next=f, title=_('Script type and Derivation path'), message1=message1,
-                    message2=message2, choices=choices, test_text=is_bip32_derivation)
+                    message2=message2, choices=choices, test_text=is_bip32_derivation,
+                    default_choice_idx=default_choice_idx)
                 return
             except ScriptTypeNotSupported as e:
                 self.show_error(e)
@@ -539,7 +542,7 @@ class BaseWizard(object):
         ])
         choices = [
             ('create_segwit_seed', _('Segwit')),
-            ('create_standard_seed', _('Standard')),
+            ('create_standard_seed', _('Legacy')),
         ]
         self.choice_dialog(title=title, message=message, choices=choices, run_next=self.run)
 

electrum/bip32.py

@@ -189,7 +189,7 @@ def xpub_from_pubkey(xtype, cK):
     return serialize_xpub(xtype, b'\x00'*32, cK)
 
 
-def bip32_derivation(s):
+def bip32_derivation(s: str) -> int:
     if not s.startswith('m/'):
         raise ValueError('invalid bip32 derivation path: {}'.format(s))
     s = s[2:]
@@ -216,7 +216,7 @@ def convert_bip32_path_to_list_of_uint32(n: str) -> List[int]:
         path.append(abs(int(x)) | prime)
     return path
 
-def is_bip32_derivation(x):
+def is_bip32_derivation(x: str) -> bool:
     try:
         [ i for i in bip32_derivation(x)]
         return True

electrum/gui/qt/installwizard.py

@@ -1,9 +1,12 @@
+# Copyright (C) 2018 The Electrum developers
+# Distributed under the MIT software license, see the accompanying
+# file LICENCE or http://www.opensource.org/licenses/mit-license.php
 
 import os
 import sys
 import threading
 import traceback
-from typing import Tuple
+from typing import Tuple, List, Callable
 
 from PyQt5.QtCore import *
 from PyQt5.QtGui import *
@@ -506,8 +509,9 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
         return clayout.selected_index()
 
     @wizard_dialog
-    def choice_and_line_dialog(self, title, message1, choices, message2,
-                               test_text, run_next) -> Tuple[str, str]:
+    def choice_and_line_dialog(self, title: str, message1: str, choices: List[Tuple[str, str, str]],
+                               message2: str, test_text: Callable[[str], int],
+                               run_next, default_choice_idx: int=0) -> Tuple[str, str]:
         vbox = QVBoxLayout()
 
         c_values = [x[0] for x in choices]
@@ -516,7 +520,8 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
         def on_choice_click(clayout):
             idx = clayout.selected_index()
             line.setText(c_default_text[idx])
-        clayout = ChoicesLayout(message1, c_titles, on_choice_click)
+        clayout = ChoicesLayout(message1, c_titles, on_choice_click,
+                                checked_index=default_choice_idx)
         vbox.addLayout(clayout.layout())
 
         vbox.addSpacing(50)