CustomBase allow you to make custom base conversion in Elixir.

Add {:custom_base, "~> 0.2"} to deps function in your mix.exs file.

After you are done, run mix deps.get in your shell to fetch and compile CustomBase.

Lets make Base12 module with conversion described below.

Add macro to your module:

defmodule Base12 do
  use CustomBase, '0123456789AB'
end

Now your module have 2 functions encode/1 and decode/1:

iex> Base12.encode(9)
"9"
iex> Base12.encode(10)
"A"
iex> Base12.encode(11)
"B"
iex> Base12.encode(12)
"10"
iex> Base12.decode("16")
18
iex> Base12.decode("AB")
131

All specs included by this library, if you want to provide your documentation, add it after use call, like this:

defmodule Base12 do
  use CustomBase, '0123456789AB'

  @moduledoc """
  Your module docs.
  """

  @doc """
  Documentation for encode/1.
  """
  def encode(integer)

  @doc """
  Documentation for decode/1.
  """
  def decode(binary)

  @doc """
  Documentation for decode!/1.
  """
  def decode!(binary)
end

Copyright (c) 2015 Igor Kapkov

This library is MIT licensed. See the LICENSE for details.