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

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styler lib mix tasks inline_attributes.ex
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lib/mix/tasks/inline_attributes.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.InlineAttrs do

  @shortdoc "EXPERIMENTAL: inlines module attributes with literal values that are only referenced once"

  @moduledoc """

  WARNING: EXPERIMENTAL | Inlines module attributes that are only referenced once in their module.



  **This is known to create invalid code.** It's far from perfect.

  It can still be a helpful first step in refactoring though.



  Formats the file with a currently hard-coded length of 122.



  **Usage**:



      mix styler.inline_attrs path/to/my/file.ex



  ## Example:



    # This ...

    defmodule A do

      @non_literal_attr Application.compile_env(...)

      @literal_value_one_time_use :my_key



      def foo(), do: Application.get_env(:my_app, @literal_value_one_time_use)

    end



    # Becomes this

    defmodule A do

      @non_literal_attr Application.compile_env(...)



      def foo(), do: Application.get_env(:my_app, :my_key)

    end

  """

  use Mix.Task



  alias Styler.Zipper



  @impl Mix.Task

  def run([file]) do

    {ast, comments} = file |> File.read!() |> Styler.string_to_ast(file)

    {{ast, _}, _} = ast |> Zipper.zip() |> Zipper.traverse_while(nil, &Styler.Style.InlineAttrs.run/2)

    File.write!(file, Styler.ast_to_string(ast, comments))

  end

end