declare -r ROOT_DIR="$(dirname $(realpath "${BASH_SOURCE[0]}"))"

declare -r ARCHIVES_DIR="${ROOT_DIR}/.neovim-cache/archives"

declare -r REPOS_DIR="${ROOT_DIR}/.neovim-cache/repos"

declare -r INSTALLATION_DIR="${ROOT_DIR}/neovim"

declare -r prebuilt_package_url="https://github.com/neovim/neovim/releases/download/${tag}/nvim-${platform}.tar.gz"

declare -r prebuilt_package_filename=$(basename "${prebuilt_package_url}")

function command_exists() {

type "${1}" >/dev/null 2>&1

}

function is_darwin() {

[[ "${RUNNER_OS}" = "macOS" ]]

}

function is_linux() {

[[ "${RUNNER_OS}" = "Linux" ]]

}

function setup_apt_packages() {

local apt_bin="apt"

if command_exists apt-fast; then

apt_bin="apt-fast"

fi

echo "Installing packages: $*"

sudo $apt_bin install -qq --yes "$@"

}

function setup_brew_packages() {

echo "Installing packages: $*"

printf 'brew "%s"\n' $* | brew bundle --no-lock --file=-

}

function get_latest_reposiotry() {

mkdir -p "${REPOS_DIR}"

local -r repo_uri="${1}"

local -r repo_dir="${2}"

echo "Repository URI: ${repo_uri}"

if [[ ! -d "${repo_dir}" ]]; then

echo "Cloning repository..."

git clone --recursive "${repo_uri}" "${repo_dir}"

pushd "${repo_dir}" >/dev/null

else

echo "Pulling latest commits..."

pushd "${repo_dir}" >/dev/null

git fetch --all --tags

git submodule update --init

fi

popd >/dev/null

}

function setup_from_source() {

get_latest_reposiotry "${repo_url}" "${REPOS_DIR}/neovim" "${branch}"

pushd "${REPOS_DIR}/neovim" >/dev/null

local ref="stable"

if git tag --list | grep -q "${tag}"; then

ref="${tag}"

elif test "${tag}" = "nightly"; then

ref="master"

fi

git checkout "${ref}"

echo "Installing dependencies..."

if is_darwin; then

setup_brew_packages ninja libtool automake cmake pkg-config gettext curl

fi

if is_linux; then

setup_apt_packages ninja-build gettext libtool libtool-bin autoconf automake cmake g++ pkg-config unzip curl

fi

echo "Running build..."

make distclean

make CMAKE_BUILD_TYPE=Release CMAKE_INSTALL_PREFIX="${INSTALLATION_DIR}" cmake

echo "Installing..."

make install

echo "Setting PATH..."

echo "${INSTALLATION_DIR}/bin" >> ${GITHUB_PATH}

}

function is_prebuilt_package_available() {

local status_code="$(curl -sL --head --write-out "%{http_code}" --output /dev/null "${prebuilt_package_url}")"

test "${status_code}" = "200"

}

function setup_prebuilt_package() {

if is_prebuilt_package_available; then

mkdir -p "${ARCHIVES_DIR}"

echo "Downloading archive..."

curl --progress-bar --continue-at - --output "${ARCHIVES_DIR}/${prebuilt_package_filename}" -L "${prebuilt_package_url}"

echo "Extracting archive..."

tar --strip-components=1 -xzf "${ARCHIVES_DIR}/${prebuilt_package_filename}" -C "${INSTALLATION_DIR}"

echo "Setting PATH..."

echo "${INSTALLATION_DIR}/bin" >> ${GITHUB_PATH}

else

echo "Prebuilt package for tag '${tag}' not available!"

echo "Falling back to source compilation."

echo

setup_from_source

fi

}

mkdir -p "${INSTALLATION_DIR}"

setup_prebuilt_package