try more default socket paths

mycli/main.py

@@ -49,7 +49,7 @@
 from .lexer import MyCliLexer
 from .__init__ import __version__
 from .compat import WIN
-from .packages.filepaths import dir_path_exists
+from .packages.filepaths import dir_path_exists, guess_socket_location
 
 import itertools
 
@@ -429,7 +429,7 @@ def _connect():
                 # Try a sensible default socket first (simplifies auth)
                 # If we get a connection error, try tcp/ip localhost
                 try:
-                    socket = '/var/run/mysqld/mysqld.sock'
+                    socket = guess_socket_location()
                     _connect()
                 except OperationalError as e:
                     # These are "Can't open socket" and 2x "Can't connect"

mycli/packages/filepaths.py

@@ -3,11 +3,13 @@
 from mycli.encodingutils import text_type
 import os
 
+DEFAULT_SOCKET_DIRS = ('/var/run/', '/var/lib/', '/tmp')
+
 
 def list_path(root_dir):
     """List directory if exists.
 
-    :param dir: str
+    :param root_dir: str
     :return: list
 
     """
@@ -84,3 +86,15 @@ def dir_path_exists(path):
 
     """
     return os.path.exists(os.path.dirname(path))
+
+
+def guess_socket_location():
+    """Try to guess the location of the default mysql socket file."""
+    socket_dirs = filter(os.path.exists, DEFAULT_SOCKET_DIRS)
+    for directory in socket_dirs:
+        for r, dirs, files in os.walk(directory, topdown=True):
+            for filename in files:
+                if filename.startswith('mysql') and filename.endswith('.socket'):
+                    return os.path.join(r, filename)
+            dirs[:] = [d for d in dirs if d.startswith('mysql')]
+    return ''