.local/bin/emacs-build


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#!/bin/bash

set -eux

src=$(realpath "${EMACS_SRC:-.}")
build=$(realpath "${EMACS_BUILD:-.}")
config_h=${build}/src/config.h

make="make -j$(nproc --all)"
configure_flags=(
    --prefix=${HOME}/apps/.emacs.$(date +%F)
    --with-cairo
    # Disable native compilation.  trunk is my daily driver, and I
    # update it regularly, so eln-cache grows a new subdir with every
    # update.
    #
    # I have tried it out unwittingly because as distros start
    # enabling it, libgccjit becomes part of Emacs build dependencies;
    # hence package managers install libgccjit when I ask for these
    # build dependencies, and 'configure' defaults to enabling native
    # compilation if libgccjit is available.
    #
    # I am happy to report that on this workstation, native-comp seems
    # to Just Work™: I remember seeing a grand total of one (1)
    # compilation-warning popup over the couple of months I have been
    # using it.  So congrats to the devs for a smooth UX 👏
    #
    # Vibes-wise, I have not noticed performance improvements though.
    # The situations where Emacs feels "slow" to me come from the
    # stalls from synchronous jobs that make the UI completely
    # unresponsive (e.g. Gnus IMAP refresh, fontconfig matching,
    # project-wide regexp search).
    #
    # So I bow out of native-comp, to avoid the eln-cache spill.
    --with-native-compilation=no
    --with-sqlite3
    --with-xinput2
    ${CONFIGURE_EXTRA_FLAGS:-}
)

is-rolling-distro ()
{
    (
        . /etc/os-release
        case "${ID}"
        in
            opensuse-tumbleweed) return 0;;
        esac
        return 1
    )
}

cache-file ()
{
    local -r cachedir=${XDG_CACHE_HOME:-~/.cache}/emacs
    test -d "${cachedir}" || mkdir -p "${cachedir}"

    local builddesc=${PWD}
    builddesc=${builddesc#~}
    builddesc=${builddesc//\//,}
    echo ${cachedir}/config${builddesc}
}

if ! is-rolling-distro
then
    configure_flags=(
        --cache-file="$(cache-file)"
        "${configure_flags[@]}"
    )
fi

if test "${DEBUG:-}"
then
    configure_flags+=(
        --enable-checking=yes,glyphs
        --enable-check-lisp-object-type
        CFLAGS='-O0 -g3'
    )
fi

if ! test -f "${src}"/Makefile
then
        ${make} -C "${src}" configure
fi

check-config ()
{
    if ! test -f "${config_h}"
    then
        return 1
    fi

    local pattern="#define EMACS_CONFIG_OPTIONS \"${configure_flags[@]}\""
    grep "${pattern}" "${config_h}"
}

cd "${build}"

if ! check-config
then
    "${src}"/configure "${configure_flags[@]}"
fi

${make} "$@"