1 files changed, 20 insertions, 0 deletions
diff --git a/third_party/python/setuptools/setuptools/_distutils/_functools.py b/third_party/python/setuptools/setuptools/_distutils/_functools.py
new file mode 100644
index 0000000000..e7053bac12
--- /dev/null
+++ b/third_party/python/setuptools/setuptools/_distutils/_functools.py
@@ -0,0 +1,20 @@
+import functools
+
+
+# from jaraco.functools 3.5
+def pass_none(func):
+    """
+    Wrap func so it's not called if its first param is None
+
+    >>> print_text = pass_none(print)
+    >>> print_text('text')
+    text
+    >>> print_text(None)
+    """
+
+    @functools.wraps(func)
+    def wrapper(param, *args, **kwargs):
+        if param is not None:
+            return func(param, *args, **kwargs)
+
+    return wrapper