move TrezorClient.expand_path to bitcoin.py

and allow its input to end with a '/' slash

electrum/bitcoin.py

@@ -24,7 +24,7 @@
 # SOFTWARE.
 
 import hashlib
-import hmac
+from typing import List
 
 from .util import bfh, bh2u, BitcoinException, print_error, assert_bytes, to_bytes, inv_dict
 from . import version
@@ -708,6 +708,24 @@ def bip32_derivation(s):
         i = int(n[:-1]) + BIP32_PRIME if n[-1] == "'" else int(n)
         yield i
 
+def convert_bip32_path_to_list_of_uint32(n: str) -> List[int]:
+    """Convert bip32 path to list of uint32 integers with prime flags
+    m/0/-1/1' -> [0, 0x80000001, 0x80000001]
+
+    based on code in trezorlib
+    """
+    path = []
+    for x in n.split('/')[1:]:
+        if x == '': continue
+        prime = 0
+        if x.endswith("'"):
+            x = x.replace('\'', '')
+            prime = BIP32_PRIME
+        if x.startswith('-'):
+            prime = BIP32_PRIME
+        path.append(abs(int(x)) | prime)
+    return path
+
 def is_bip32_derivation(x):
     try:
         [ i for i in bip32_derivation(x)]