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{ runCommand, lib, bash, coreutils, findutils, gnused, less

  # Extra path to Home Manager. If set then this path will be tried
  # before `$HOME/.config/nixpkgs/home-manager` and
  # `$HOME/.nixpkgs/home-manager`.
, path ? null
}:

let

  pathStr = if path == null then "" else path;

in

runCommand
  "home-manager"
  {
    preferLocalBuild = true;
    allowSubstitutes = false;
    meta = with lib; {
      description = "A user environment configurator";
      maintainers = [ maintainers.rycee ];
      platforms = platforms.unix;
      license = licenses.mit;
    };
  }
  ''
    install -v -D -m755  ${./home-manager} $out/bin/home-manager

    substituteInPlace $out/bin/home-manager \
      --subst-var-by bash "${bash}" \
      --subst-var-by coreutils "${coreutils}" \
      --subst-var-by findutils "${findutils}" \
      --subst-var-by gnused "${gnused}" \
      --subst-var-by less "${less}" \
      --subst-var-by HOME_MANAGER_PATH '${pathStr}'

    install -D -m755 ${./completion.bash} \
      $out/share/bash-completion/completions/home-manager
  ''