Do not fail if curtsies is not available (fixes #978)

sebastinas · sebastinas · commit c1f0385c79c0 · 2023-01-15T17:34:55.000+01:00
Also delay imports of dependencies only used to log the version.
diff --git a/bpython/args.py b/bpython/args.py
@@ -30,19 +30,13 @@
 """
 
 import argparse
-from typing import Tuple, List, Optional, NoReturn, Callable
 import code
-import curtsies
-import cwcwidth
-import greenlet
 import importlib.util
 import logging
 import os
-import pygments
-import requests
 import sys
-import xdg
 from pathlib import Path
+from typing import Tuple, List, Optional, NoReturn, Callable
 
 from . import __version__, __copyright__
 from .config import default_config_path, Config
@@ -205,10 +199,22 @@ def callback(group):
         bpython_logger.addHandler(logging.NullHandler())
         curtsies_logger.addHandler(logging.NullHandler())
 
+    import cwcwidth
+    import greenlet
+    import pygments
+    import requests
+    import xdg
+
     logger.info("Starting bpython %s", __version__)
     logger.info("Python %s: %s", sys.executable, sys.version_info)
     # versions of required dependencies
-    logger.info("curtsies: %s", curtsies.__version__)
+    try:
+        import curtsies
+
+        logger.info("curtsies: %s", curtsies.__version__)
+    except ImportError:
+        # may happen on Windows
+        logger.info("curtsies: not available")
     logger.info("cwcwidth: %s", cwcwidth.__version__)
     logger.info("greenlet: %s", greenlet.__version__)
     logger.info("pygments: %s", pygments.__version__)  # type: ignore
