defmodule GenLoop.Mixfile do
  use Mix.Project

  def project do
    [
      app: :gen_loop,
      description: """
      A supervised free-form loop function. Elixir adapter for plain_fsm, with
      receive / sync-call macros and GenServer-like starting, stopping and name
      registration.
      """,
      version: "2.1.0",
      elixir: "~> 1.4",
      build_embedded: Mix.env() == :prod,
      deps: deps(),
      name: "GenLoop",
      source_url: "https://github.com/lud/gen_loop",
      package: package(),
      dialyzer: dialyzer(),
      versioning: versioning()
    ]
  end

  # Configuration for the OTP application
  #
  # Type "mix help compile.app" for more information
  def application do
    # Specify extra applications you'll use from Erlang/Elixir
    [extra_applications: [:logger]]
  end

  defp deps do
    [
      {:plain_fsm, "~> 1.4"},
      # Dev
      {:libdev, ">= 0.0.0", only: [:dev, :test], runtime: false},
      {:readmix, "~> 0.6", only: [:dev, :test], runtime: false}
    ]
  end

  defp package() do
    [
      licenses: ["MIT"],
      maintainers: ["Ludovic Demblans <ludovic@demblans.com>"],
      links: %{"Github" => "https://github.com/lud/gen_loop"}
    ]
  end

  defp dialyzer do
    [
      flags: [:unmatched_returns, :error_handling, :unknown, :extra_return],
      list_unused_filters: true,
      plt_add_deps: :app_tree,
      plt_add_apps: [:ex_unit, :mix],
      plt_local_path: "_build/plts"
    ]
  end

  def cli do
    [
      preferred_envs: [
        dialyzer: :test
      ]
    ]
  end

  defp versioning do
    [
      annotate: true,
      before_commit: [
        &readmix/1,
        {:add, "README.md"},
        &gen_changelog/1,
        {:add, "CHANGELOG.md"}
      ]
    ]
  end

  def readmix(vsn) do
    rdmx = Readmix.new(vars: %{app_vsn: vsn})
    :ok = Readmix.update_file(rdmx, "README.md")
  end

  defp gen_changelog(vsn) do
    case System.cmd("git", ["cliff", "--tag", vsn, "-o", "CHANGELOG.md"], stderr_to_stdout: true) do
      {_, 0} -> IO.puts("Updated CHANGELOG.md with #{vsn}")
      {out, _} -> {:error, "Could not update CHANGELOG.md:\n\n #{out}"}
    end
  end
end