Horrible code to convert some nested text data to json

parser.ex

text
|> String.split("\n")
|> Enum.reduce({["{"], "    "}, fn line, {output, current_indent} ->
  case Regex.run(~r/^( +)(.*): ?(.*)/, line, capture: :all_but_first) do
    [indent, key, ""] ->
      close_braces =
        if indent < current_indent do
          Enum.map_join(
            (String.length(current_indent) - 4)..String.length(indent)//-4,
            "",
            &"#{String.duplicate(" ", &1)}},\n"
          )
        else
          ""
        end

      {[~s(#{close_braces}#{indent}"#{key}": {) | output], indent}

    [indent, key, value] ->
      {[~s(#{indent}"#{key}": "#{value}",) | output], indent}

    _ ->
      {output, current_indent}
  end
end)
|> then(fn {output, current_indent} ->
          [Enum.map_join(
            (String.length(current_indent) - 4)..0//-4,
            "",
            &"#{String.duplicate(" ", &1)}}\n"
          )|output]
end)
|> Enum.reverse()
|> Enum.join("\n")
|> String.replace(~r/,(\s.*\})/, "\\1")
|> Jason.decode!(objects: :ordered_objects)