defmodule Circuits.GPIO.MixProject do
  use Mix.Project

  @version "1.0.1"
  @source_url "https://github.com/elixir-circuits/circuits_gpio"

  {:ok, system_version} = Version.parse(System.version())
  @elixir_version {system_version.major, system_version.minor, system_version.patch}

  def project do
    [
      app: :circuits_gpio,
      version: @version,
      elixir: "~> 1.6",
      description: description(),
      package: package(),
      source_url: @source_url,
      compilers: [:elixir_make | Mix.compilers()],
      make_targets: ["all"],
      make_clean: ["clean"],
      docs: docs(),
      aliases: [format: [&format_c/1, "format"]],
      start_permanent: Mix.env() == :prod,
      build_embedded: true,
      dialyzer: dialyzer(),
      deps: deps(@elixir_version),
      preferred_cli_env: %{
        docs: :docs,
        "hex.publish": :docs,
        "hex.build": :docs
      }
    ]
  end

  def application, do: []

  defp description do
    "Use GPIOs in Elixir"
  end

  defp package do
    %{
      files: [
        "lib",
        "src/*.[ch]",
        "src/*.sh",
        "mix.exs",
        "README.md",
        "PORTING.md",
        "LICENSE",
        "CHANGELOG.md",
        "Makefile"
      ],
      licenses: ["Apache-2.0"],
      links: %{"GitHub" => @source_url}
    }
  end

  defp deps(elixir_version) when elixir_version >= {1, 7, 0} do
    [
      {:ex_doc, "~> 0.22", only: :docs, runtime: false},
      {:credo, "~> 1.6", only: :dev, runtime: false},
      {:dialyxir, "~> 1.2", only: :dev, runtime: false}
      | deps()
    ]
  end

  defp deps(_), do: deps()

  defp deps() do
    [
      {:elixir_make, "~> 0.6", runtime: false}
    ]
  end

  defp dialyzer() do
    [
      flags: [:missing_return, :extra_return, :unmatched_returns, :error_handling, :underspecs],
      list_unused_filters: true,
      plt_file: {:no_warn, "_build/plts/dialyzer.plt"}
    ]
  end

  defp docs do
    [
      assets: "assets",
      extras: ["README.md", "PORTING.md", "CHANGELOG.md"],
      main: "readme",
      source_ref: "v#{@version}",
      source_url: @source_url
    ]
  end

  defp format_c([]) do
    case System.find_executable("astyle") do
      nil ->
        Mix.Shell.IO.info("Install astyle to format C code.")

      astyle ->
        System.cmd(astyle, ["-n", "src/*.c"], into: IO.stream(:stdio, :line))
    end
  end

  defp format_c(_args), do: true
end