bottle

defmodule Bottle.Map do
  @moduledoc """
  Provides custom guards for maps
  """

  @doc """
  Guard that passes for an empty map

  ## Examples
    iex> is_empty_map(%{})
    true
    
    iex> is_empty_map(%{"foo" => :bar})
    false
    
    iex> is_empty_map(%{foo: "bar"})
    false

    iex> is_empty_map({"anything", "else"})
    false
  """
  defguard is_empty_map(term) when is_map(term) and term == %{}

  @doc """
  Guard that passes for an map containing at least 1 element

  ## Examples
    iex> is_non_empty_map(%{"foo" => :bar})
    true
    
    iex> is_non_empty_map(%{foo: "bar"})
    true
    
    iex> is_non_empty_map(%{})
    false
    
    iex> is_non_empty_map({"anything", "else"})
    false
  """
  defguard is_non_empty_map(term) when is_map(term) and term != %{}
end