static compilation with crystal

crystal2nix.nix

{ lib, crystal, nix-prefetch-git, makeStaticLibraries, stdenv, glibc, pcre
, libyaml, boehmgc, libevent }:

let
  staticStdenv = makeStaticLibraries stdenv;
  staticGlibc = glibc.static;
  staticPcre = pcre.override { stdenv = staticStdenv; };
  staticLibyaml = libyaml.override { stdenv = staticStdenv; };
  staticBoehmgc =
    boehmgc.override { stdenv = staticStdenv // { isLinux = false; }; };
  staticLibevent = libevent.override { stdenv = staticStdenv; };

in crystal.buildCrystalPackage {
  pname = "crystal2nix";
  version = "unstable-2018-07-31";

  nixPrefetchGit = "${lib.getBin nix-prefetch-git}/bin/nix-prefetch-git";
  unpackPhase = "substituteAll ${./crystal2nix.cr} crystal2nix.cr";

  buildInputs =
    [ staticGlibc staticPcre staticLibyaml staticBoehmgc staticLibevent ];

  crystalBinaries.crystal2nix = {
    src = "crystal2nix.cr";
    options = [ "--release" "--static" "--no-debug" ];
  };

  meta = with lib; {
    description = "Utility to convert Crystal's shard.lock files to a Nix file";
    license = licenses.mit;
    maintainers = [ maintainers.manveru ];
  };
}