#!/usr/bin/env bash
set -eu

version=0.8.0
arch="$(uname -m)"
tarball="shellcheck-v$version.linux.$arch.tar.xz"
declare -A sha256=(
    [aarch64]=9f47bbff5624babfa712eb9d64ece14c6c46327122d0c54983f627ae3a30a4ac
    [x86_64]=ab6ee1b178f014d1b86d1e24da20d1139656c8b0ed34d2867fbb834dad02bf0a
)

check_version() {
    out="$(shellcheck --version 2>/dev/null)" && [[ "$out" = *"
version: $version
"* ]]
}

if ! check_version; then
    tmpdir="$(mktemp -d)"
    trap 'rm -r "$tmpdir"' EXIT
    cd "$tmpdir"
    curl -fLO "https://github.com/koalaman/shellcheck/releases/download/v$version/$tarball"
    sha256sum -c <<<"${sha256[$arch]} $tarball"
    tar -xJf "$tarball" --no-same-owner --strip-components=1 -C /usr/local/bin "shellcheck-v$version/shellcheck"
    check_version
fi