default.nix

{ reflex-platform ? import ./reflex-platform.nix
, compiler   ? "ghcjs"
} :
let
  pkgs = reflex-platform.nixpkgs.pkgs;

  haskellPackages = reflex-platform.${compiler}.override {
                      overrides = self: super: {
                        wai-middleware-static = pkgs.haskell.lib.dontCheck (super.wai-middleware-static); }; };

  adjust-for-ghcjs = drv: {
    executableToolDepends = [pkgs.closurecompiler pkgs.zopfli];
    doHaddock = false;
    doCheck = false;
    postInstall = ''
      mkdir -p $out

      mkdir -p $out/css/reflex/basics-exercises
      cp -r ./css/exercises $out/css/reflex/basics-exercises/
      cp -r ./css/solutions $out/css/reflex/basics-exercises/

      mkdir -p $out/js/reflex/basics-exercises
      cp $out/bin/solutions.jsexe/all.js $out/js/reflex/basics-exercises/solutions.js

      cd $out/bin/solutions.jsexe
      closure-compiler all.js --compilation_level=ADVANCED_OPTIMIZATIONS --isolation_mode=IIFE --assume_function_wrapper --jscomp_off="*" --externs=all.js.externs > $out/js/reflex/basics-exercises/solutions.min.js
      rm -Rf $out/bin/solutions.jsexe
      rm -Rf $out/bin

      cd $out/js/reflex/basics-exercises
      zopfli -i1000 solutions.min.js

      rm -Rf $out/lib
      rm -Rf $out/nix-support
      rm -Rf $out/share
    '';
  };

  adjust = drv:
    if compiler == "ghcjs"
    then adjust-for-ghcjs drv
    else adjust-for-ghcjs drv;

  exercises = pkgs.haskell.lib.overrideCabal (haskellPackages.callPackage ./exercises.nix {}) adjust;
in
  exercises