Enforce frozen string literals when possible and output a list of problematic files

freeze.rb

#!/usr/bin/env ruby

class Run
  def initialize(files)
    @files = files
  end

  def call
    @files.each(&:process)

    if system("bundle exec rspec --fail-fast")
      system("git commit -a -m 'WIP'")
    else
      @files.each(&:restore)

      if @files.count > 1
        Run.new(left).call
        Run.new(right).call
      elsif @files.count == 1
        IGNORE << @files.first.path
        puts IGNORE
      else
        raise "This shouldn't have happened."
      end
    end
  end

  def left = @files.slice(...middle)
  def right = @files.slice(middle..)
  def middle = @files.count / 2
end

class File
  def initialize(path)
    @path = path
  end

  attr_reader :path

  def process
    @original = File.read(@path)
    File.write(@path, "# frozen_string_literal: true\n\n" + @original)
  end

  def restore
    File.write(@path, @original)
  end
end

IGNORE = []

Run.new(
  Dir.glob("**/*.rb").map { |f| File.new(f) }
).call


puts IGNORE