incremental, new python recipe (#7201)

dev-python/incremental/incremental-21.3.0.recipe

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+SUMMARY="A small library that versions your Python projects"
+DESCRIPTION="Incremental is a small library that versions your Python projects.
+
+API documentation can be found here https://twisted.github.io/incremental/docs/."
+HOMEPAGE="https://github.com/twisted/incremental"
+COPYRIGHT="2001-2015
+	Allen Short
+	Amber Hawkie Brown
+	Andrew Bennetts
+	Andy Gayton
+	Antoine Pitrou
+	Apple Computer, Inc.
+	Ashwini Oruganti
+	Benjamin Bruheim
+	Bob Ippolito
+	Canonical Limited
+	Christopher Armstrong
+	David Reid
+	Divmod Inc.
+	Donovan Preston
+	Eric Mangold
+	Eyal Lotem
+	Google Inc.
+	Hybrid Logic Ltd.
+	Hynek Schlawack
+	Itamar Turner-Trauring
+	James Knight
+	Jason A. Mobarak
+	Jean-Paul Calderone
+	Jessica McKellar
+	Jonathan D. Simms
+	Jonathan Jacobs
+	Jonathan Lange
+	Julian Berman
+	Jürgen Hermann
+	Kevin Horn
+	Kevin Turner
+	Laurens Van Houtven
+	Mary Gardiner
+	Massachusetts Institute of Technology
+	Matthew Lefkowitz
+	Moshe Zadka
+	Paul Swartz
+	Pavel Pergamenshchik
+	Rackspace, US Inc.
+	Ralph Meijer
+	Richard Wall
+	Sean Riley
+	Software Freedom Conservancy
+	Tavendo GmbH
+	Thijs Triemstra
+	Thomas Herve
+	Timothy Allen
+	Tom Prince
+	Travis B. Hartwell"
+LICENSE="MIT"
+REVISION="1"
+SOURCE_URI="$HOMEPAGE/archive/refs/tags/incremental-$portVersion.tar.gz"
+CHECKSUM_SHA256="57b6a0785f265ffe59a454276efac1062943bb5b7bff7b5505bf054a563c22c4"
+SOURCE_DIR="incremental-incremental-$portVersion"
+
+ARCHITECTURES="any"
+
+PROVIDES="
+	$portName = $portVersion
+	"
+REQUIRES="
+	haiku
+	"
+
+BUILD_REQUIRES="
+	haiku_devel
+	"
+
+PYTHON_PACKAGES=(python3 python38 python39 python310)
+PYTHON_VERSIONS=(3.7 3.8 3.9 3.10)
+for i in "${!PYTHON_PACKAGES[@]}"; do
+pythonPackage=${PYTHON_PACKAGES[i]}
+pythonVersion=${PYTHON_VERSIONS[$i]}
+eval "PROVIDES_${pythonPackage}=\"\
+	${portName}_$pythonPackage = $portVersion\
+	\"; \
+REQUIRES_$pythonPackage=\"\
+	haiku\n\
+	cmd:python$pythonVersion\n\
+	click_$pythonPackage\
+	\""
+BUILD_REQUIRES="$BUILD_REQUIRES
+	setuptools_$pythonPackage"
+BUILD_PREREQUIRES="$BUILD_PREREQUIRES
+	cmd:python$pythonVersion"
+done
+
+INSTALL()
+{
+	for i in "${!PYTHON_PACKAGES[@]}"; do
+		pythonPackage=${PYTHON_PACKAGES[i]}
+		pythonVersion=${PYTHON_VERSIONS[$i]}
+
+		python=python$pythonVersion
+		installLocation="$prefix"/lib/$python/vendor-packages/
+		export PYTHONPATH=$installLocation:$PYTHONPATH
+		mkdir -p "$installLocation"
+		rm -rf build
+		$python setup.py build install \
+			--root=/ --prefix="$prefix"
+
+		install -m 755 -d "$docDir"
+		install -m 644 -t "$docDir" README.rst
+
+		packageEntries  $pythonPackage \
+			"$prefix"/lib/$python \
+			"$docDir"
+	done
+}