{ pkgs ? import <nixpkgs> {} }:

pkgs.stdenv.mkDerivation rec {
  name = "dhall-json-simple";

  src = pkgs.fetchurl {
    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.32.0/dhall-json-1.6.4-x86_64-linux.tar.bz2";
    sha256 = "1qd2nfmwgdmffwjmvcs2cjm1jkqkv7mi8hf3lcvsx3gjcc2mv3jw";
  };

  installPhase = ''
    mkdir -p $out/bin
    DHALL_TO_JSON=$out/bin/dhall-to-json
    DHALL_TO_YAML=$out/bin/dhall-to-yaml
    JSON_TO_DHALL=$out/bin/json-to-dhall
    install -D -m555 -T dhall-to-json $DHALL_TO_JSON
    install -D -m555 -T dhall-to-yaml $DHALL_TO_YAML
    install -D -m555 -T json-to-dhall $JSON_TO_DHALL
    mkdir -p $out/etc/bash_completion.d/
    $DHALL_TO_JSON --bash-completion-script $DHALL_TO_JSON > $out/etc/bash_completion.d/dhall-to-json-completion.bash
    $DHALL_TO_YAML --bash-completion-script $DHALL_TO_YAML > $out/etc/bash_completion.d/dhall-to-yaml-completion.bash
    $JSON_TO_DHALL --bash-completion-script $JSON_TO_DHALL > $out/etc/bash_completion.d/json-to-dhall-completion.bash
  '';
}