install_emacs_debian

#!/bin/sh

set -e
set -u

if [ "$#" -gt 1 ]; then
    printf 'usage: %s [branch]\n' "$0" 1>&2
    exit 1
fi

readonly branch="${1:-master}"
readonly rootdir="${HOME}"/opt/local/src/emacs

if [ ! -e "${rootdir}" ]; then
    printf 'error: %s does not exist.\n' "${rootdir}" 1>&2
    exit 1
fi

packages=""
packages="${packages} librsvg2"
packages="${packages} libgnutls30"
packages="${packages} libgccjit-9-dev"
readonly packages

for package in ${packages} ; do
    if ! (apt list --installed | grep "${package}" > /dev/null) ; then
        printf 'error: %s is not installed.\n' "${package}" 1>&2
        exit 1
    fi
done

CPPFLAGS=""
CPPFLAGS="${CPPFLAGS} -I${HOME}/opt/local/include"
readonly CPPFLAGS
export CPPFLAGS

LDFLAGS=""
LDFLAGS="${LDFLAGS} -L${HOME}/opt/local/lib"
readonly LDFLAGS
export LDFLAGS

git_clean_excludes=""
git_clean_excludes="${git_clean_excludes} -e GPATH"
git_clean_excludes="${git_clean_excludes} -e GRTAGS"
git_clean_excludes="${git_clean_excludes} -e GTAGS"
readonly git_clean_excludes

git -C "${rootdir}" clean -q -d -x ${git_clean_excludes} -f
git -C "${rootdir}" checkout "${branch}"
git -C "${rootdir}" clean -q -d -x ${git_clean_excludes} -f
git -C "${rootdir}" reset --hard HEAD
git -C "${rootdir}" pull --ff-only origin "${branch}"

options=""
options="${options} --without-x"
options="${options} --with-gnutls"
options="${options} --with-xml2"
options="${options} --with-rsvg"
options="${options} --with-native-compilation"

options="${options} --prefix=${HOME}/opt/local"

readonly options

(cd "${rootdir}" && ./autogen.sh)
(cd "${rootdir}" && ./configure ${options})
(cd "${rootdir}" && make -j 8)
(cd "${rootdir}" && make install)