mix.exs

defmodule MIDISynth.MixProject do
  use Mix.Project

  @version "0.4.1"
  @source_url "https://github.com/fhunleth/midi_synth"

  def project do
    [
      app: :midi_synth,
      version: @version,
      elixir: "~> 1.11",
      package: package(),
      compilers: [:elixir_make | Mix.compilers()],
      aliases: [format: ["format", &format_c/1]],
      make_targets: ["all"],
      make_clean: ["clean"],
      make_error_message: make_error_message(),
      docs: docs(),
      description: description(),
      start_permanent: Mix.env() == :prod,
      dialyzer: dialyzer(),
      deps: deps(),
      preferred_cli_env: %{
        docs: :docs,
        "hex.publish": :docs,
        "hex.build": :docs,
        credo: :test
      }
    ]
  end

  def application do
    [
      extra_applications: [:logger]
    ]
  end

  defp description do
    "MIDI synthesizer for Elixir"
  end

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

  defp deps do
    [
      {:elixir_make, "~> 0.6", runtime: false},
      {:ex_doc, "~> 0.22", only: :docs, runtime: false},
      {:dialyxir, "~> 1.2", only: :dev, runtime: false},
      {:credo, "~> 1.2", only: :test, runtime: false},
      {:credo_binary_patterns, "~> 0.2.6", only: :test, runtime: false}
    ]
  end

  defp dialyzer() do
    [
      flags: [:missing_return, :extra_return, :unmatched_returns, :error_handling, :underspecs]
    ]
  end

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

  defp format_c([]) do
    astyle =
      System.find_executable("astyle") ||
        Mix.raise("""
        Could not format C code since astyle is not available.
        """)

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

  defp format_c(_args), do: true

  defp make_error_message() do
    """
    This is usually due to not being able to find the fluidsynth library. Try
    installing it and then rerun the build to see if that fixes the error.

    On MacOS, run `brew install fluidsynth pkg-config`.

    On Ubuntu, try `sudo apt install libfluidsynth-dev`

    If this does not fix the issue, the C compiler error message right above
    this help text may provide a clue.
    """
  end
end