#!/bin/bash

function print_help() {
  printf "Usage:"
  printf "  %s [ --home ] HOST OPTION [ USER ]\n" "$0"
  exit 1
}

if [ -z "${2+x}" ]; then
  print_help
fi

if [ "$1" = "--home" ]; then
  useHome=1
  host=$2
  if [ -z "${3+x}" ]; then
    print_help
  fi
  option=$3
  if [ -n "${4+x}" ]; then
    user=$4
  else
    user=$USER
  fi
else
  useHome=0
  host=$1
  option=$2
fi

if [ $useHome -eq 1 ]; then
  nix eval ".#nixosConfigurations.$host.config.home-manager.users.$user.$option"
else
  nix eval ".#nixosConfigurations.$host.config.$option"
fi