#!/usr/bin/env bash
set -euox pipefail

# Build Emacs 28 with GTK and native compilation.
# The pure GTK implementation enable native support in Wayland.
# Apt dependencies are for Ubuntu 20.04.

march=${1:-native}
mtune=${1:-native}
emacs_git_dir=emacs-pgtk-nativecomp
ccache_dir=/usr/lib/ccache

echo "Compiling with march=$march and mtune=$mtune"

sudo apt install --no-install-recommends -y \
	make \
	autoconf \
	gcc-10 \
	g++-10 \
	texinfo \
	pkg-config \
	libjansson-dev \
	zlib1g-dev \
	libgccjit-10-dev \
	libgnutls28-dev \
	libncurses5-dev \
	libx11-dev \
	libgtk-3-dev \
	libjpeg-dev \
	libgif-dev \
	libtiff-dev \
	libxpm-dev \
	libwebkit2gtk-4.0-dev

(
export CC="gcc-10"
export CXX="gcc-10"
export CFLAGS="-O3 -march=${march} -mtune=${mtune} -pipe -fomit-frame-pointer"
export CXXFLAGS="${CFLAGS}"

if [[ -d $ccache_dir ]]; then
	export PATH="$ccache_dir:$PATH"
fi

echo "CFLAGS options: $CFLAGS"

[[ -d $emacs_git_dir ]] || git clone https://github.com/flatwhatson/emacs.git $emacs_git_dir -b pgtk-nativecomp

pushd $emacs_git_dir

git fetch origin --prune
git pull

./autogen.sh

./configure --with-dbus \
	--with-cairo \
	--with-json \
	--with-harfbuzz \
	--with-xwidgets \
	--with-modules \
	--with-native-compilation \
	--with-pgtk

make bootstrap
make -j "$(nproc)"

popd

echo "Finish installation with 'sudo make install'"
)