WIP

.gitignore

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+/_build
+/cover
+/deps
+erl_crash.dump
+*.ez

README.md

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+Isn
+===
+
+** TODO: Add description **

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for third-
+# party users, it should be done in your mix.exs file.
+
+# Sample configuration:
+#
+#     config :logger,
+#       level: :info
+#
+#     config :logger, :console,
+#       format: "$date $time [$level] $metadata$message\n",
+#       metadata: [:user_id]
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env}.exs"

lib/isn/base.ex

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+defmodule Isn.Base do
+  defmacro __using__(type) do
+    quote bind_quoted: [type: type] do
+      # @behaviour Ecto.Type
+      #
+      @moduledoc """
+      Definition for the #{@type} module.
+      """
+
+      def type,
+        do: type
+
+      defdelegate blank?, to: Ecto.Type
+
+      def cast(isn), do: {:ok, to_string(isn)}
+      def load(isn), do: {:ok, to_string(isn)}
+      def dump(isn), do: {:ok, to_string(isn)}
+    end
+  end
+end

lib/isn/extension.ex

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+defmodule Isn.Extension do
+  alias Postgrex.TypeInfo
+
+  @behaviour Postgrex.Extension
+  @isn ~w(ean13 isbn13 ismn13 issn13 isbn ismn issn upc)
+
+  def init(parameters, _opts),
+    do: parameters
+
+  def matching(_library),
+    do: Enum.reduce(@isn, [], fn(t, ack) -> ack ++ [type: t] end)
+
+  def format(_),
+    do: :string
+
+  def encode(%TypeInfo{type: type}, binary, _types, _opts) when type in @isn,
+    do: binary
+
+  def decode(%TypeInfo{type: type}, binary, _types, _opts) when type in @isn,
+    do: binary
+end

lib/isn/isbn13.ex

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+defmodule Isn.ISBN13 do
+  use Isn.Base, :isbn13
+end

mix.exs

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+defmodule Isn.Mixfile do
+  use Mix.Project
+
+  @version "0.0.1"
+
+  def project do
+    [app: :isn,
+     version: @version,
+     elixir: "~> 1.0",
+     deps: deps,
+     test_paths: ["test"],
+     # Hex
+     description: description,
+     package: package,
+     # Docs
+     name: "Isn",
+     docs: [source_ref: "v#{@version}",
+            source_url: "https://github.com/Frost/isn"]
+   ]
+  end
+
+  # Configuration for the OTP application
+  #
+  # Type `mix help compile.app` for more information
+  def application do
+    []
+  end
+
+  defp description do
+    """
+    Ecto types for the postgreSQL isn extension.
+    """
+  end
+
+  defp package do
+    [contributors: ["Martin Frost"],
+     licences: ["MIT"],
+     links: %{"GitHub" => "https://github.com/Frost/isn"}]
+  end
+
+  defp deps do
+    [{:postgrex, "~> 0.8.1"},
+     {:ecto, "~> 0.11.0"}]
+  end
+end

mix.lock

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+%{"decimal": {:hex, :decimal, "1.1.0"},
+  "ecto": {:hex, :ecto, "0.11.0"},
+  "poolboy": {:hex, :poolboy, "1.5.1"},
+  "postgrex": {:hex, :postgrex, "0.8.1"}}

test/isn_test.exs

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+defmodule IsnTest do
+  use ExUnit.Case
+  doctest Isn
+
+  test "the truth" do
+    assert 1 + 1 == 2
+  end
+end

test/test_helper.exs

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+ExUnit.start()