nbcall(){
  nixExpressionPath="$1"

  if [[ -z "$nixExpressionPath" ]]; then
    nixExpressionPath="./default.nix"
  else
    pathHadToBeCorrected=false
    if [[ ! $nixExpressionPath == *.nix ]]; then
      nixExpressionPath="$nixExpressionPath.nix"
      pathHadToBeCorrected=true
    fi
    if [[ ! $nixExpressionPath == ./* ]] && [[ ! $nixExpressionPath == /* ]]; then
      nixExpressionPath="./$nixExpressionPath"
      pathHadToBeCorrected=true
    fi

    if $pathHadToBeCorrected; then
      echo "The path was autocorrected from '$1' to '$nixExpressionPath'"
    fi

    if [[ ! -f "$nixExpressionPath" ]]; then
      echo "WARNING: The path '$nixExpressionPath' is not a file. Please make sure you gave a valid path. Expecting \`nix-build\` to fail."
    fi
  fi


  nix-build -E "with import <nixpkgs> {}; callPackage $nixExpressionPath {}"
}