#! /bin/zsh
#
# this file:
#   https://dataswamp.org/~incal/conf/.zsh/install-emacs

emacs_src=https://git.savannah.gnu.org/git/emacs.git

src_dir=~/src
emacs_dir=${src_dir}/emacs

emacs-version () {
    emacs --version | head -n 1
}

emacs-install-prepare () {
    sudo apt-get -qq update
    sudo apt-get install build-essential debian-goodies libgccjit-12-dev
    sudo apt-get build-dep emacs
    mkdir -p $emacs_dir
}

emacs-src-get () {
    emacs-install-prepare
    cd $src_dir
    git clone $emacs_src
}

emacs-src-reset () {
    emacs-install-prepare
    cd $emacs_dir
    git reset --hard
    git clean -d -f -x
    git config pull.rebase false
    git pull $emacs_src
}

emacs-src-update () {
    cd $emacs_dir
    git pull
}

emacs-install () {
    local reset=$1
    (( ${+reset} )) && emacs-src-reset || emacs-src-update

    local old=$(emacs-version)

    cd $emacs_dir
    autogen.sh
    configure \
        --enable-link-time-optimization \
        --with-native-compilation=aot   \
        --without-compress-install

    local cpus=0-1
    taskset -c $cpus make
    sudo taskset -c $cpus make install

    local new=$(emacs-version)
    echo "version: $old -> $new"
}
alias emacs-upgrade=emacs-install
alias upgrade-emacs=emacs-install