# HG changeset patch
# User Mads Kiilerich <mads@kiilerich.com>
# Date 2019-12-27 00:26:14
# Node ID 7c43e15fb8bc7a73f17f577e59a4698589b6809d
# Parent  2a902d81cb6fa6d8ea7601ed0dd7ab50fd1015a6

vcs: make hg get_changesets compatible with py3

If start was 0, we would end up with start_pos None and getting a compare with
None which would fail in py3.

Instead, make sure start_pos is None iff start is None.

Also, make the actual check more robust.

diff --git a/kallithea/lib/vcs/backends/hg/repository.py b/kallithea/lib/vcs/backends/hg/repository.py
--- a/kallithea/lib/vcs/backends/hg/repository.py
+++ b/kallithea/lib/vcs/backends/hg/repository.py
@@ -509,11 +509,11 @@ class MercurialRepository(BaseRepository
         :param reversed: return changesets in reversed order
         """
         start_raw_id = self._get_revision(start)
-        start_pos = self.revisions.index(start_raw_id) if start else None
+        start_pos = None if start is None else self.revisions.index(start_raw_id)
         end_raw_id = self._get_revision(end)
-        end_pos = self.revisions.index(end_raw_id) if end else None
+        end_pos = None if end is None else self.revisions.index(end_raw_id)
 
-        if None not in [start, end] and start_pos > end_pos:
+        if start_pos is not None and end_pos is not None and start_pos > end_pos:
             raise RepositoryError("Start revision '%s' cannot be "
                                   "after end revision '%s'" % (start, end))