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A code-style enforcer that will just FIFY instead of complaining

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styler lib style simple.ex
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lib/style/simple.ex 

# Copyright 2023 Adobe. All rights reserved.

# This file is licensed to you under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License. You may obtain a copy

# of the License at http://www.apache.org/licenses/LICENSE-2.0



# Unless required by applicable law or agreed to in writing, software distributed under

# the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS

# OF ANY KIND, either express or implied. See the License for the specific language

# governing permissions and limitations under the License.



defmodule Styler.Style.Simple do

  @moduledoc """

  Simple 1-1 rewrites all crammed into one module to make for more efficient traversals



  Credo Rules addressed:



  * Credo.Check.Readability.LargeNumbers

      Formatter handles large number (>5 digits) rewrites, but doesn't rewrite typos like `100_000_0`, so it's worthwhile to have styler do this

  """



  @behaviour Styler.Style



  alias Styler.Zipper



  # `?-` isn't part of the number node - it's its parent - so all numbers are positive at this point

  def run({{:__block__, meta, [number]}, _} = zipper) when is_number(number) and number >= 10_000 do

    # Checking here rather than in the anon function due to compiler bug https://github.com/elixir-lang/elixir/issues/10485

    integer? = is_integer(number)



    meta =

      Keyword.update!(meta, :token, fn

        "0x" <> _ = token ->

          token



        "0b" <> _ = token ->

          token



        "0o" <> _ = token ->

          token



        token when integer? ->

          delimit(token)



        # is float

        token ->

          [int_token, decimals] = String.split(token, ".")

          "#{delimit(int_token)}.#{decimals}"

      end)



    Zipper.replace(zipper, {:__block__, meta, [number]})

  end



  def run(zipper), do: zipper



  defp delimit(token), do: token |> String.to_charlist() |> remove_underscores([]) |> add_underscores([])



  defp remove_underscores([?_ | rest], acc), do: remove_underscores(rest, acc)

  defp remove_underscores([digit | rest], acc), do: remove_underscores(rest, [digit | acc])

  defp remove_underscores([], reversed_list), do: reversed_list



  defp add_underscores([a, b, c, d | rest], acc), do: add_underscores([d | rest], [?_, c, b, a | acc])

  defp add_underscores(reversed_list, acc), do: reversed_list |> Enum.reverse(acc) |> to_string()

end