main/py-yaml: add py2/py3 subpackages

main/py-yaml/APKBUILD

 # Contributor: Fabian Affolter <fabian@affolter-engineering.ch>
+# Contributor: Jakub Jirutka <jakub@jirutka.cz>
 # Maintainer: Fabian Affolter <fabian@affolter-engineering.ch>
 pkgname=py-yaml
 _pkgname=PyYAML
@@ -6,24 +7,42 @@ pkgver=3.11
 pkgrel=0
 pkgdesc="Python bindings for YAML"
 url="http://pyyaml.org"
-arch="all"
+arch="noarch"
 license="MIT"
 depends=""
-depends_dev=""
-makedepends="yaml-dev python-dev"
-install=""
-subpackages=""
+makedepends="python2-dev python3-dev yaml-dev"
+subpackages="py2-${pkgname#py-}:_py2 py3-${pkgname#py-}:_py3"
 source="http://pyyaml.org/download/pyyaml/$_pkgname-$pkgver.tar.gz"
+builddir="$srcdir/$_pkgname-$pkgver"
 
-_builddir="$srcdir"/$_pkgname-$pkgver
 build() {
-	cd "$_builddir"
-	python setup.py build || return 1
+	cd "$builddir"
+
+	python2 setup.py build || return 1
+	python3 setup.py build
 }
 
 package() {
-	cd "$_builddir"
-	python setup.py install --prefix=/usr --root="$pkgdir" || return 1
+	mkdir -p "$pkgdir"
+}
+
+_py2() {
+	replaces="$pkgname"
+	_py python2
+}
+
+_py3() {
+	_py python3
+}
+
+_py() {
+	local python="$1"
+	pkgdesc="$pkgdesc (for $python)"
+	arch="all"
+	install_if="$pkgname=$pkgver-r$pkgrel $python"
+
+	cd "$builddir"
+	$python setup.py install --prefix=/usr --root="$subpkgdir"
 }
 
 md5sums="f50e08ef0fe55178479d3a618efe21db  PyYAML-3.11.tar.gz"