defmodule Panty.String do

  @moduledoc """
  String utilities
  """

  @doc """
  Return camel-case from a given string.

  ## Examples
      iex> String.camel_case("ha noi")
      "haNoi"
      iex> String.camel_case("Ha noi")
      "haNoi"
      iex> String.camel_case("ha-noi")
      "haNoi"

  """

  @spec camel_case(String.t) :: String.t

  def camel_case(string) do
    string
    |> String.split(~r"[^a-zA-Z]", trim: true)
    |> Enum.with_index()
    |> Enum.map(
      fn
        {el, 0} -> String.downcase(el)

        {el, _idx} -> String.capitalize(el)
      end
    )
    |> Enum.join("")
  end

  @doc """
  Return kebab-case from a given string.

  ## Examples
      iex> String.keybab_case("ha noi")
      "ha-noi"
      iex> String.kebab_case("Panty Utilities")
      "panty-utilities"

  """

  @spec kebab_case(String.t) :: String.t

  def kebab_case(string) do
    string
    |> String.split()
    |> Enum.join("-")
    |> String.downcase
  end
end