os() {
  uname="$(uname)"
  case $uname in
    Linux) echo linux ;;
    Darwin) echo macos ;;
    FreeBSD) echo freebsd ;;
    *) echo "$uname" ;;
  esac
}

distro() {
  local os_name
  os_name=$(os)

  if [ "$os_name" = "macos" ] || [ "$os_name" = "freebsd" ]; then
    echo "$os_name"
    return
  fi

  if [ -f /etc/os-release ]; then
    (
      . /etc/os-release
      if [ "${ID_LIKE-}" ]; then
        for id_like in $ID_LIKE; do
          case "$id_like" in debian | fedora | opensuse | arch)
            echo "$id_like"
            return
            ;;
          esac
        done
      fi

      echo "$ID"
    )
    return
  fi
}

distro_name() {
  if [ "$(uname)" = "Darwin" ]; then
    echo "macOS v$(sw_vers -productVersion)"
    return
  fi

  if [ -f /etc/os-release ]; then
    (
      . /etc/os-release
      echo "$PRETTY_NAME"
    )
    return
  fi

  uname -sr
}