Make Server.has_session() use returncode

libtmux/common.py

@@ -189,6 +189,7 @@ def __init__(self, *args, **kwargs):
             self.process.stdout.close()
             stderr = self.process.stderr.read()
             self.process.stderr.close()
+            returncode = self.process.returncode
         except Exception as e:
             logger.error(
                 'Exception for %s: \n%s' % (
@@ -197,6 +198,8 @@ def __init__(self, *args, **kwargs):
                 )
             )
 
+        self.returncode = returncode
+
         self.stdout = console_to_str(stdout)
         self.stdout = self.stdout.split('\n')
         self.stdout = list(filter(None, self.stdout))  # filter empty values

libtmux/server.py

@@ -334,24 +334,11 @@ def has_session(self, target_session, exact=True):
 
         proc = self.cmd('has-session', '-t%s' % target_session)
 
-        if not proc.stdout:
-            return True
-        if any(
-            x in proc.stdout for x in
-            ['failed to connect to server', 'error connecting to']
-        ):
-            return False
-        elif 'no server running' in proc.stdout:  # tmux 2.0
-            return False
-        elif 'can\'t find session' in proc.stdout:  # tmux 2.1
-            return False
-        elif 'bad session name' in proc.stdout:  # tmux >= 1.9
-            return False
-        elif 'session not found' in proc.stdout:
-            return False
-        else:
+        if not proc.returncode:
             return True
 
+        return False
+
     def kill_server(self):
         """``$ tmux kill-server``."""
         self.cmd('kill-server')