devel/py-undefined: Add py-undefined 0.0.8

Ever needed a global object that act as None but not quite? Like for example
keyword argument for function, where None make sense, so you need a default
value.

One solution is to create as singleton object:
mysingleton = object()

Though it becomes difficult to track the singleton across libraries, and teach
users where to import this from. It's also relatively annoying use this
singleton across library.

Introducing undefined:
>>> import undefined
>>> from undefined import Undefined
>>> undefined is Undefined
True

devel/Makefile

@@ -5825,6 +5825,7 @@
     SUBDIR += py-ubelt
     SUBDIR += py-uhid-freebsd
     SUBDIR += py-ujson
+    SUBDIR += py-undefined
     SUBDIR += py-unearth
     SUBDIR += py-unicodecsv
     SUBDIR += py-unicodedata2

devel/py-undefined/Makefile

@@ -0,0 +1,21 @@
+PORTNAME=	undefined
+PORTVERSION=	0.0.8
+CATEGORIES=	devel python
+MASTER_SITES=	PYPI
+PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
+
+MAINTAINER=	sunpoet@FreeBSD.org
+COMMENT=	Simple package
+WWW=		https://github.com/Carreau/undefined
+
+LICENSE=	MIT
+LICENSE_FILE=	${WRKSRC}/LICENSE
+
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}flit-core>=0:devel/py-flit-core@${PY_FLAVOR}
+
+USES=		python
+USE_PYTHON=	autoplist concurrent pep517
+
+NO_ARCH=	yes
+
+.include <bsd.port.mk>

devel/py-undefined/distinfo

@@ -0,0 +1,3 @@
+TIMESTAMP = 1710609060
+SHA256 (undefined-0.0.8.tar.gz) = c6f237c0e3d7e7519694b21bd471dc25ee3c3379d9c23b74ebf02aa349c5cff7
+SIZE (undefined-0.0.8.tar.gz) = 3137

devel/py-undefined/files/patch-pyproject.toml

@@ -0,0 +1,11 @@
+--- pyproject.toml.orig	2019-07-26 01:33:34 UTC
++++ pyproject.toml
+@@ -1,6 +1,6 @@
+ [build-system]
+-requires = ["flit"]
+-build-backend = "flit.buildapi"
++requires = ["flit_core"]
++build-backend = "flit_core.buildapi"
+ 
+ [tool.flit.metadata]
+ module = "undefined"

devel/py-undefined/pkg-descr

@@ -0,0 +1,16 @@
+Ever needed a global object that act as None but not quite? Like for example
+keyword argument for function, where None make sense, so you need a default
+value.
+
+One solution is to create as singleton object:
+mysingleton = object()
+
+Though it becomes difficult to track the singleton across libraries, and teach
+users where to import this from. It's also relatively annoying use this
+singleton across library.
+
+Introducing undefined:
+>>> import undefined
+>>> from undefined import Undefined
+>>> undefined is Undefined
+True