main/lua-rex: upgrade to 2.8.0

Introduce support for Lua 5.2 and 5.3 in addition to the existing
5.1 support.

Version 2.7.0 of lrexlib removed the make based build system
and depends on luarock for building.

To avoid a dependency on luarocks (which is in testing) a custom
build was introduced.

main/lua-rex/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
+_luaversions="5.1 5.2 5.3"
 pkgname=lua-rex
-pkgver=2.5.3
-pkgrel=1
+pkgver=2.8.0
+pkgrel=0
 pkgdesc="Lua bindings to regular expression library pcre and posix"
 url="http://lrexlib.luaforge.net/"
 arch="all"
 license="MIT"
 depends="lua-rex-pcre lua-rex-posix"
-makedepends="pcre-dev lua-dev"
+makedepends="pcre-dev"
 install=
-subpackages="$pkgname-pcre $pkgname-posix"
-source="http://luaforge.net/frs/download.php/4759/lrexlib-2.5.3.zip"
+subpackages="$pkgname-pcre:_pcre $pkgname-posix:_posix"
 
-_builddir="$srcdir"/lrexlib-$pkgver
+for _i in $_luaversions; do
+	makedepends="$makedepends lua$_i-dev lua$_i"
+	subpackages="$subpackages lua$_i-rex-pcre:_pcre_${_i/./_}
+		lua$_i-rex-posix:_posix_${_i/./_}"
+
+	eval "_pcre_${_i/./_}() { _split $_i pcre; }"
+	eval "_posix_${_i/./_}() { _split $_i posix; }"
+done
+
+source="$pkgname-$pkgver.tar.gz::https://github.com/rrthomas/lrexlib/archive/rel-${pkgver//./-}.tar.gz"
+
+_builddir="$srcdir"/lrexlib-rel-${pkgver//./-}
 
 prepare() {
-	cd "$_builddir"
-	sed -i -e "s/^MYCFLAGS.*/MYCFLAGS = $CFLAGS -fPIC/" src/defaults.mak
-	sed -i -e "s/^LD .*/LD = gcc/" \
-		src/common.mak
+	local _ver
+	for _ver in $_luaversions; do
+		cp -r "$_builddir" "$srcdir"/build-$_ver
+	done
+}
+
+_build_variant() {
+	local _ver=$1
+	local _obj=$2
+	local _flags="$3"
+
+	${CC:-gcc} \
+		${CFLAGS} \
+		$(pkg-config --cflags lua$_ver) \
+		-shared \
+		-fPIC \
+		-o $_obj.${pkgver%.*} \
+		$_flags \
+		-DVERSION=\"$pkgver\" \
+		-DLUA_COMPAT_5_2 || return 1
+	ln -s $_obj.${pkgver%.*} $_obj || return 1
 }
 
 build() {
-	cd "$_builddir"
-	make -j1 -C src/pcre
-	make -j1 -C src/posix
+	local _ver
+	for _ver in $_luaversions; do
+		msg "build for Lua $_ver"
+		cd "$srcdir"/build-$_ver
+		_build_variant $_ver rex_pcre.so \
+			'src/common.c src/pcre/lpcre.c src/pcre/lpcre_f.c
+			-lpcre' || return 1
+		_build_variant $_ver rex_posix.so \
+			'src/common.c src/posix/lposix.c' || return 1
+	done
 }
 
 package() {
 	mkdir -p "$pkgdir"
 }
 
-pcre() {
+_pcre() {
 	pkgdesc="Lua bindings to pcre regular expressions library"
 	depends=
-	cd "$_builddir"
-	install -d "$subpkgdir"/usr/lib/lua/5.1
-	cp -a src/pcre/rex_pcre.so* "$subpkgdir"/usr/lib/lua/5.1
+	mkdir -p "$subpkgdir"
 }
 
-posix() {
+_posix() {
 	pkgdesc="Lua bindings to posix regular expressions library"
 	depends=
-	cd "$_builddir"
-	install -d "$subpkgdir"/usr/lib/lua/5.1
-	cp -a src/posix/rex_posix.so* "$subpkgdir"/usr/lib/lua/5.1
+	mkdir -p "$subpkgdir"
+}
+
+_split() {
+	local _ver=$1
+	local _lib=$2
+	pkgdesc="Lua $_ver bindings to $_lib regular expressions library"
+	install_if="lua$_ver lua-rex-$_lib=$pkgver-r$pkgrel"
+	depends=
+	install -d "$subpkgdir"/usr/lib/lua/$_ver || return 1
+	cp -a "$srcdir"/build-$_ver/rex_$_lib.so* \
+		"$subpkgdir"/usr/lib/lua/$_ver || return 1
 }
 
-md5sums="a51c5ff54d85bfd1222ddbfd922a7d51  lrexlib-2.5.3.zip"
+md5sums="25b88d455e3d389ab431568290060af5  lua-rex-2.8.0.tar.gz"
+sha256sums="d47f2de3340b30c75a849feaf02f79de5a8adf735edf631bbd58447db2101822  lua-rex-2.8.0.tar.gz"
+sha512sums="9593263541757f384df327c85a01df648767041c494f9f7b3491a521e7d4f94918b967c48adff6794bc93baf3b4a11add6feb4630de8bf53903ff7a819c1b006  lua-rex-2.8.0.tar.gz"