only assert exact matches on tmux 2.1 and up

Author: tony

libtmux/server.py

@@ -12,7 +12,7 @@
 
 from . import exc, formats
 from .common import EnvironmentMixin, TmuxRelationalObject, tmux_cmd, \
-    session_check_name
+    session_check_name, has_gte_version
 from .session import Session
 
 logger = logging.getLogger(__name__)
@@ -321,15 +321,15 @@ def has_session(self, target_session, exact=True):
         :type target_session: str
         :param exact: match the session name exactly.
             tmux uses fnmatch by default. Internally prepends ``=`` to the
-            session in ``$ tmux has-session``.
+            session in ``$ tmux has-session``. tmux 2.1 and up only.
         :type exact: bool
         :raises: :exc:`exc.BadSessionName`
         :rtype: bool
 
         """
         session_check_name(target_session)
 
-        if exact:
+        if exact and has_gte_version('2.1'):
             target_session = '={}'.format(target_session)
 
         proc = self.cmd('has-session', '-t%s' % target_session)

tests/test_session.py

@@ -17,8 +17,9 @@ def test_has_session(server, session):
     """Server.has_session returns True if has session_name exists."""
     TEST_SESSION_NAME = session.get('session_name')
     assert server.has_session(TEST_SESSION_NAME)
-    assert not server.has_session(TEST_SESSION_NAME[:-2])
-    assert server.has_session(TEST_SESSION_NAME[:-2], exact=False)
+    if has_gte_version('2.1'):
+        assert not server.has_session(TEST_SESSION_NAME[:-2])
+        assert server.has_session(TEST_SESSION_NAME[:-2], exact=False)
     assert not server.has_session('asdf2314324321')