project init

mix.exs

@@ -0,0 +1,70 @@
+defmodule Chromaprint.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :chromaprint,
+      version: "0.1.0",
+      elixir: "~> 1.20-rc",
+      start_permanent: Mix.env() == :prod,
+      deps: deps(),
+      compilers: [:elixir_make] ++ Mix.compilers(),
+      make_targets: ["all"],
+      make_clean: ["clean"],
+      make_env: &make_env/0
+    ]
+  end
+
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  defp deps do
+    [
+      {:elixir_make, "~> 0.9", runtime: false},
+    ]
+  end
+
+  defp make_env do
+    verify_chromaprint_source!()
+
+    %{
+      "ERTS_INCLUDE_DIR" => erts_include_dir(),
+      "CHROMAPRINT_USE_SYSTEM" =>
+        if(System.get_env("CHROMAPRINT_USE_SYSTEM") in ~w(1 true on ON YES yes),
+          do: "ON",
+          else: "OFF"
+        )
+    }
+  end
+
+  defp erts_include_dir do
+    Path.join([
+      :code.root_dir() |> to_string(),
+      "erts-#{:erlang.system_info(:version)}",
+      "include"
+    ])
+  end
+
+  defp verify_chromaprint_source! do
+    use_system = System.get_env("CHROMAPRINT_USE_SYSTEM") in ~w(1 true on ON YES yes)
+    submodule_cmake = Path.join([__DIR__, "c_src", "chromaprint", "CMakeLists.txt"])
+
+    if not use_system and not File.exists?(submodule_cmake) do
+      Mix.raise("""
+      The chromaprint source submodule is missing at c_src/chromaprint/.
+
+      Either initialise it:
+
+          git submodule update --init c_src/chromaprint
+
+      Or, to link against a system-provided libchromaprint (recommended for
+      Nix and other sandboxed builds), set CHROMAPRINT_USE_SYSTEM=1 and ensure
+      chromaprint.h and libchromaprint can be found via the compiler's default
+      paths (or CHROMAPRINT_INCLUDE_DIR / CHROMAPRINT_LIB_DIR if not).
+      """)
+    end
+  end
+end