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

version=3.5.1
arch="$(uname -m)"

case $arch in
    "x86_64")
        binary="shfmt_v${version}_linux_amd64"
        sha256=56099a689b68534f98e1f8f05d3df6750ab53e3db68f514ee45595bf5b79d158
        ;;

    "aarch64")
        binary="shfmt_v${version}_linux_arm64"
        sha256=09d7902de04d52ebe0b332d84a9746d195f7e930806bdc2436f84d0de6a2d368
        ;;
esac

check_version() {
    out="$(shfmt --version 2>/dev/null)" && [ "$out" = "v$version" ]
}

if ! check_version; then
    tmpdir="$(mktemp -d)"
    trap 'rm -r "$tmpdir"' EXIT
    cd "$tmpdir"
    curl -fLO "https://github.com/mvdan/sh/releases/download/v$version/$binary"
    sha256sum -c <<<"$sha256 $binary"
    chmod +x "$binary"
    mv "$binary" /usr/local/bin/shfmt
    check_version
fi