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

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styler lib mix tasks remove_unused.ex
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lib/mix/tasks/remove_unused.ex 

# Copyright 2025 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 Mix.Tasks.Styler.RemoveUnused do

  @shortdoc "EXPERIMENTAL: uses unused import/alias/require compiler warnings to remove those lines"

  @moduledoc """

  WARNING: EXPERIMENTAL | Removes unused import/alias/require statements by compiling the app and parsing warnings, then deleting the specified lines.



  Usage:



      mix styler.remove_unused

  """

  use Mix.Task



  alias Mix.Shell.IO



  @impl Mix.Task

  def run(_) do

    # Warnings come over stderr, so gotta redirect

    {output, _} = System.cmd("mix", ~w(compile --all-warnings), stderr_to_stdout: true)



    if output =~ "warning: unused" do

      IO.info("Removing unused import/alias/require lines...\n")



      output

      |> String.split("\n\n")

      |> Stream.map(&Regex.run(~r/warning\: unused (alias|require|import).* (.*\.exs?):(\d+)\:/s, &1))

      |> Stream.filter(& &1)

      |> Stream.map(fn [_full_message, _require_or_alias, file, line] ->

        file =

          if File.exists?(file) do

            file

          else

            [umbrella_corrected] = Path.wildcard("apps/*/#{file}")

            umbrella_corrected

          end



        {file, String.to_integer(line)}

      end)

      |> Enum.group_by(fn {file, _} -> file end, fn {_, line} -> line end)

      |> Enum.sort_by(fn {file, _} -> file end)

      |> Enum.each(fn {file, lines} ->

        contents = file |> File.read!() |> String.split("\n")



        IO.info("==> #{file}")



        lines

        |> Enum.sort()

        |> Enum.each(&IO.info("#{&1}: #{Enum.at(contents, &1 - 1)}"))



        contents =

          lines

          |> Enum.sort(:desc)

          |> Enum.reduce(contents, &List.delete_at(&2, &1 - 1))

          |> Enum.join("\n")



        File.write!(file, contents)

        IO.info("")

      end)



      IO.info("Running `mix format` to remove any excess newlines.")



      Mix.Task.run("format")



      IO.info("Done.")

    else

      IO.info("No \"unused\" warnings detected, no work to do.")

    end

  end

end