apkbuild-pypi.in: use gpep517 in template

copied from `newapkbuild.in`, should work
even without a `pyproject.toml` due to the
`setuptools.build_meta:__legacy__` backend

apkbuild-pypi.in

@@ -14,7 +14,7 @@ my %pkgmap = ();
 my %licenses = ();
 
 my $template = <<'EOF';
-# Automatically generated by apkbuild-pypi, template 3
+# Automatically generated by apkbuild-pypi, template 4
 [% authors %]
 pkgname=[% pkgname %]
 #_pkgreal is used by apkbuild-pypi to find modules at PyPI
@@ -27,26 +27,27 @@ replaces="[% replaces %]"
 url="http://packages.python.org/pypi/[% pkgreal %]"
 arch="noarch"
 license="[% license %]"
-checkdepends="python3-dev"
-makedepends="py3-setuptools"
+makedepends="py3-gpep517 py3-setuptools py3-wheel"
+checkdepends="py3-pytest"
 subpackages=""
 source="[% source %]"
 builddir="$srcdir/$_pkgreal-$pkgver"
 
 build() {
-	python3 setup.py build
+	gpep517 build-wheel \
+		--wheel-dir .dist \
+		--output-fd 3 3>&1 >&2
 }
 
 check() {
-	python3 setup.py test
+	python3 -m venv --clear --without-pip --system-site-packages .testenv
+	.testenv/bin/python3 -m installer .dist/*.whl
+	.testenv/bin/python3 -m pytest
 }
 
 package() {
-	PYTHONPATH=$pkgdir$(python3 -c "import site; print(site.getsitepackages()[0])") \
-	python3 setup.py install \
-		--prefix=/usr \
-		--root="$pkgdir" \
-		--single-version-externally-managed
+	python3 -m installer -d "$pkgdir" \
+		.dist/*.whl
 }
 
 EOF