rec {
  buildSiteTo = prefix: site:
    builtins.toString (builtins.attrValues (builtins.mapAttrs (name: content:
      if builtins.isString content
      then ''
        cp ${builtins.toFile name content} ${prefix}/${name}
      ''
      else if builtins.isPath content
      then ''
        cp -r ${content} ${prefix}/${name}
      ''
      else if builtins.isAttrs content && content ? "__toString"
      then ''
        cp ${builtins.toFile name (toString content)} ${prefix}/${name}
      ''
      else if builtins.isAttrs content
      then ''
        mkdir -p ${prefix}/${name}
        ${buildSiteTo "${prefix}/${name}" content}
      ''
      else
        throw "Site page must be string, path or attrset, but got ${
          builtins.typeOf content
        }: [${toString content}]")
    site));
}