{ nixpkgs ? import <nixpkgs> {} }:

let
  pname = "regfish";
  version = "1";

  buildInputs = with pkgs; [
    hsEnv
  ];

  extraCmds = with pkgs; ''
    export HISTFILE="\$HOME/.history/env-${pname}"
    export MANPATH=\$MANPATH:${lftp}/share/man
    $(grep export ${hsEnv.outPath}/bin/ghc)
    ${mkExports staticPkgs}
    if test -f "\$HOME/.env-${pname}"; then
      . "\$HOME/.env-${pname}"
    fi
  '';

  hsEnv = hsPkgs.ghcWithPackagesOld (self: with self;
    [
      acidState
      cabalInstall
      tagsoup
      wreq
    ]
  );

  hsPkgs = pkgs.haskellPackages_ghc783_profiling.override {
    extension = self: super: with self; {
    };
  };

  pkgs = nixpkgs // staticPkgs;
  staticPkgs = with nixpkgs; {
  };

  #{{{ mkExports : set -> string
  # Create shell script that exports a set's attributes.
  mkExports = set: with builtins; with pkgs.lib.strings;
    let
      # XXX attribute names are not escaped, they have to be sane
      # XXX the value should not contain <newline>
      mkExport = k: "export ${k}=${escapeSh (getAttr k set)}";
      escapeSh = stringAsChars (c: "\\${c}");
    in
      concatStringsSep "\n" (map mkExport (attrNames set));
  #}}}

in pkgs.myEnvFun {
  name = "${pname}-${version}";
  inherit buildInputs extraCmds;
}
# vim: set fdm=marker :