pep517, new python recipe (#7023)

dev-python/pep517/pep517-0.12.0.recipe

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+SUMMARY="API to call PEP 517 hooks"
+DESCRIPTION="PEP 517 specifies a standard API for systems which build Python packages.
+
+PEP 660 extends it with a build mode that leads to editable installs.
+
+This package contains wrappers around the hooks specified by PEP 517 and
+PEP 660. It provides:
+
+- A mechanism to call the hooks in a subprocess, so they are isolated from the current process.
+- Fallbacks for the optional hooks, so that frontends can call the hooks without checking which \
+are defined."
+HOMEPAGE="https://pypi.org/project/pep517/"
+COPYRIGHT="2017 Thomas Kluyver"
+LICENSE="MIT"
+REVISION="1"
+pypiVersion="0a/65/6e656d49c679136edfba25f25791f45ffe1ea4ae2ec1c59fe9c35e061cd1"
+SOURCE_URI="https://files.pythonhosted.org/packages/$pypiVersion/pep517-0.12.0.tar.gz"
+CHECKSUM_SHA256="931378d93d11b298cf511dd634cf5ea4cb249a28ef84160b3247ee9afb4e8ab0"
+
+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$pythonVersion\n\
+	tomli_$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
+
+		packageEntries  $pythonPackage \
+			$prefix/lib/python*
+	done
+}