boring

defmodule Boring.Util.StringUtil do
  @spec to_snake_case(value :: atom | String.t()) :: String.t()
  def to_snake_case(atom) when is_atom(atom) do
    atom
    |> Atom.to_string()
    |> to_snake_case()
  end

  def to_snake_case(string) when is_binary(string) do
    string
    |> String.replace(~r/([A-Z]+)([A-Z][a-z])/, "\\1_\\2")
    |> String.replace(~r/([a-z\d])([A-Z])/, "\\1_\\2")
    |> String.replace(~r/-/, "_")
    |> String.downcase()
  end
end