arc-browser: use `xmlstartlet` for `passthru.updateScript`

  writeShellApplication,

  curl,

  common-updater-scripts,

  xmlstarlet,

}:

stdenvNoCC.mkDerivation (finalAttrs: {

    runtimeInputs = [

      curl

      common-updater-scripts

      xmlstarlet

    ];

    text = ''

      redirect_url="$(curl -s -L -f "https://releases.arc.net/release/Arc-latest.dmg" -o /dev/null -w '%{url_effective}')"

      # The url scheme is: https://releases.arc.net/release/Arc-1.23.4-56789.dmg

      # We strip everything before 'Arc-' and after '.dmg'

      version="''${redirect_url##*/Arc-}"

      version="''${version%.dmg}"

      update-source-version arc-browser "$version" --file=./pkgs/by-name/ar/arc-browser/package.nix

      latest_version_string="$(curl -s "https://releases.arc.net/updates.xml" | xmlstarlet sel -N sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" -t -v "//item[1]/sparkle:shortVersionString" -n)"

      version_part="''${latest_version_string%% (*}"

      build_part="''${latest_version_string##*\(}"

      build_part="''${build_part%\)*}"

      version="''${version_part}-''${build_part}"

      update-source-version arc-browser "$version"

    '';

  });