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# Contributor: Jakub Jirutka <jakub@jirutka.cz>
# Maintainer: Jakub Jirutka <jakub@jirutka.cz>

# Note: This software is total mess and it seems to be nearly impossible to
#   create a clean distribution package.
pkgname=emscripten
# Keep with sync with pkg emscrypten-fastcomp!
pkgver=1.39.0
pkgrel=0
pkgdesc="An LLVM-to-JavaScript Compiler"
url="https://emscripten.org/"
arch="" # Test failures
license="MIT UOI-NCSA"
depends="$pkgname-optimizer>=$pkgver emscripten-fastcomp>=$pkgver
	nodejs python3 node-closurecompiler-externs"
makedepends="binaryen clang cmake"
checkdepends="closure-compiler"
subpackages="$pkgname-optimizer
	$pkgname-libs-asmjs:libs_asmjs:noarch
	$pkgname-libs-wasm:libs_wasm:noarch"
source="emscripten-$pkgver.tar.gz::https://github.com/emscripten-core/emscripten/archive/$pkgver.tar.gz
	fix-python-shebang.patch
	settings_template-paths.patch
	add-system-level-config.patch
	move-emcc-txt.patch
	binaryen-wasm-js-path.patch
	closurecompiler-externs-path.patch
	closurecompiler-language_in-es6.patch
	embuilder-fix-task-all-for-wasm.patch
	embuilder-omit-provided.patch
	add-global-cache.patch
	emscripten.cfg"

_ports="Bullet-version_1:bullet
	FreeType-version_1:freetype
	libpng-version_1:libpng
	Ogg-version_1:ogg
	SDL2-version_13:sdl2
	SDL2_image-version_3:sdl2-image
	SDL2_net-version_2:sdl2-net
	SDL2_ttf-version_1:sdl2-ttf
	Vorbis-version_1:vorbis
	zlib-version_1:zlib
	"
for _port in $_ports; do
	_port=${_port%:*}
	source="$source $pkgname-port-$_port-zip::https://github.com/emscripten-ports/${_port%-*}/archive/${_port##*-}.zip"
done

export EM_CACHE="$srcdir/cache"
export EM_CONFIG="$srcdir/.emscripten"
export EM_PORTS="$srcdir/ports"

prepare() {
	default_prepare

	# This file is read from emcc.py for --help.
	cp site/build/text/docs/tools_reference/emcc.txt .

	sed -e "s|/usr/share/emscripten|$builddir|" \
		-e "s|/usr/bin/emoptimizer|$builddir/tools/optimizer/optimizer|" \
		"$srcdir"/emscripten.cfg > "$EM_CONFIG"

	# Symlink fetched ports to the directory where emscripten can find them.
	mkdir -p "$EM_PORTS"
	local port; for port in $_ports; do
		ln -s "$srcdir"/$pkgname-port-${port%:*}-zip "$EM_PORTS"/${port#*:}.zip
	done

	# Backup and patch system_libs.py to block fetching ports from internet.
	cp tools/system_libs.py tools/system_libs.py.orig
	sed -Ei 's/^(\s+).*\.urlopen\(.*/\1logging.error("fetching disabled in abuild"); exit(1)/' \
		tools/system_libs.py
}

build() {
	cd "$builddir"/tools/optimizer

	msg "Building optimizer..."
	cmake \
		-DCMAKE_BUILD_TYPE=Release \
		-DCMAKE_INSTALL_PREFIX=/usr \
		-DCMAKE_CXX_FLAGS="$CXXFLAGS" \
		-DCMAKE_C_FLAGS="$CFLAGS" \
		-DCMAKE_C_COMPILER=clang \
		-DCMAKE_VERBOSE_MAKEFILE=ON
	make

	cd "$builddir"

	msg "Building libraries and ports for asm.js..."
	./embuilder.py build ALL

	msg "Building libraries and ports for WebAssembly..."
	EMCC_WASM_BACKEND=1 ./embuilder.py build ALL
}

check() {
	cd "$builddir"/tests

	rm -f hello_world.js*
	../emcc -Os --closure 1 -o hello_world.js hello_world.c
	node hello_world.js
}

package() {
	local destdir="$pkgdir/usr/share/$pkgname"
	local name

	mkdir -p "$destdir"
	cp -r "$builddir"/* "$destdir"/

	cd "$destdir"

	# Revert original file without connection blocking.
	mv tools/system_libs.py.orig tools/system_libs.py

	find . -name "*.bat" -delete
	find . -name "*.pyc" -delete  # these contain wrong absolute path
	rm -r docs   # there are only few PDFs and TeX sources
	rm -r media  # media for website
	rm -r site   # a website (?)
	rm -r tests  # looks more like a dump of random sources than decent tests
	rm -r third_party  # bundled stuff
	rm -r tools/optimizer  # we've already built it
	rm AUTHORS LICENSE ./*.md ./*.markdown package.json
	rm system/lib/build_cxx_natively.sh tools/update_libc_symbols.sh  # garbage

	mkdir -p "$pkgdir"/usr/bin
	for name in  em++ em-config emar embuilder.py emcc emcmake \
		emconfigure emlink.py emmake emrun emscons
	do
		ln -s ../share/$pkgname/$name "$pkgdir"/usr/bin/$name
	done

	install -D -m 644 "$srcdir"/emscripten.cfg "$pkgdir"/etc/emscripten.cfg

	mkdir cache  # this directory should not exist yet!
	install -m 644 "$EM_CACHE"/is_vanilla.txt cache/
}

optimizer() {
	pkgdesc="Emscripten's optimizer for asm.js code"
	depends=""

	install -D -m 755 "$builddir"/tools/optimizer/optimizer \
		"$subpkgdir"/usr/bin/emoptimizer
}

libs_asmjs() {
	pkgdesc="Prebuilt libraries and ports for Emscripten - asm.js"
	depends="$pkgname=$pkgver-r$pkgrel"
	local destdir="$subpkgdir/usr/share/$pkgname/cache/asmjs"

	mkdir -p "$destdir"
	cp -r "$EM_CACHE"/asmjs/*.bc "$destdir"/
}

libs_wasm() {
	pkgdesc="Prebuilt libraries and ports for Emscripten - WebAssembly"
	depends="$pkgname=$pkgver-r$pkgrel"
	local destdir="$subpkgdir/usr/share/$pkgname/cache/wasm"

	mkdir -p "$destdir"
	cp -r "$EM_CACHE"/wasm/*.bc "$destdir"/
}

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