package.nix

{ lib
, stdenv
, cmake
, boost
, catch2
, enableTests ? true
}:

stdenv.mkDerivation {
  name = "cpp-nix";

  # good source filtering is important for caching of builds.
  # It's easier when subprojects have their own distinct subfolders.
  src = lib.sourceByRegex ./. [
    "^src.*"
    "^test.*"
    "CMakeLists.txt"
  ];

  # Distinguishing between native build inputs (runnable on the host
  # at compile time) and normal build inputs (runnable on target
  # platform at run time) is important for cross compilation.
  nativeBuildInputs = [ cmake ];
  buildInputs = [ boost ];
  checkInputs = [ catch2 ];

  doCheck = enableTests;
  cmakeFlags = lib.optional (!enableTests) "-DTESTING=off";
}