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

version=0.7.2
arch="$(uname -m)"
tarball="shellcheck-v$version.linux.$arch.tar.xz"
declare -A sha256=(
    [aarch64]=a12bdfe0f95811ad6c0a091006b919b2834b0619b460cfa596f557edd62e45ab
    [x86_64]=70423609f27b504d6c0c47e340f33652aea975e45f312324f2dbf91c95a3b188
)

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

if ! check_version; then
    tmpdir="$(mktemp -d)"
    trap 'rm -r "$tmpdir"' EXIT
    cd "$tmpdir"
    wget -nv "https://github.com/koalaman/shellcheck/releases/download/v$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