Ocaml Nix

default.nix

with import <nixpkgs> {};

let
  ocamlPackages = pkgs.recurseIntoAttrs pkgs.ocamlPackages_4_03;
  ocamlVersion = (builtins.parseDrvName ocamlPackages.ocaml.name).version;
  findlibSiteLib = "${ocamlPackages.findlib}/lib/ocaml/${ocamlVersion}/site-lib";
  ocamlInit = pkgs.writeText "ocamlinit" ''
    let () =
      try Topdirs.dir_directory "${findlibSiteLib}"
      with Not_found -> ()
    ;;
    #use "topfind";;
    #thread;;
    #camlp4o;;
    #require "core";;
    #require "core.syntax";;
  '';
in
stdenv.mkDerivation rec {
  name = "rwo-shell";
  src = null;
  buildInputs = with ocamlPackages;
    [ ocaml
      camlp4
      core
      core_extended
      findlib
      merlin

      base
      utop
    ];
#   CAML_LD_LIBRARY_PATH="''${CAML_LD_LIBRAkRY_PATH}''${CAML_LD_LIBRARY_PATH:+:}''$1/lib/ocaml/${ocaml.version}/site-lib/${name}/";
  UTOP_SITE_LISP = "${ocamlPackages.utop}/share/emacs/site-lisp";
  OCAMLINIT = "${ocamlInit}";
  shellHook = ''
    alias utop="utop -init ${ocamlInit}"
    alias ocaml="ocaml -init ${ocamlInit}"
  '';
}