Add recipe for black

py2app/recipes/__init__.py

@@ -1,6 +1,7 @@
 from . import PIL  # noqa: F401
 from . import automissing  # noqa: F401
 from . import autopackages  # noqa: F401
+from . import black  # noqa: F401
 from . import ctypes  # noqa: F401
 from . import detect_dunder_file  # noqa: F401
 from . import ftplib  # noqa: F401

py2app/recipes/black.py

@@ -0,0 +1,26 @@
+import os
+from pkg_resources import get_distribution
+
+
+def check(cmd, mf):
+    m = mf.findNode("black")
+    if m is None or m.filename is None:
+        return None
+
+    egg = get_distribution('black').egg_info
+    top = os.path.join(egg, 'top_level.txt')
+
+    # These cannot be in zip
+    packages = ["black", "blib2to3"]
+
+    # black may include optimized platform specific C extension which has
+    # unusual name, e.g. 610faff656c4cfcbb4a3__mypyc; best to determine it from
+    # the egg-info/top_level.txt
+    with open(top, 'r') as f:
+        includes = set(f.read().strip().split('\n'))
+    includes = list(includes.difference(packages))
+
+    # Missed dependency
+    includes.append('pathspec')
+
+    return {"includes": includes, "packages": packages}