[PATCH] python: support relative path in default database

[Doan Tran Cong Danh <congdanhqx@gmail.com>]

From notmuch 0.28, notmuch support relative database path in
notmuch-config(1), but python binding haven't taught this yet.

afew denied to work with a perfectly fine notmuch-config due to this.
---
 bindings/python/notmuch/database.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/bindings/python/notmuch/database.py b/bindings/python/notmuch/database.py
index 342d665a..88ca836e 100644
--- a/bindings/python/notmuch/database.py
+++ b/bindings/python/notmuch/database.py
@@ -675,7 +675,10 @@ class Database(object):
         if not config.has_option('database', 'path'):
             raise NotmuchError(message="No DB path specified"
                                        " and no user default found")
-        return config.get('database', 'path')
+        db_path = config.get('database', 'path')
+        if not os.path.isabs(db_path):
+            db_path = os.path.expanduser(os.path.join("~", db_path))
+        return db_path
 
     """notmuch_database_get_config"""
     _get_config = nmlib.notmuch_database_get_config
-- 
2.21.0