Detect files with methods that may modify string

string_modifier.rb

# frozen_string_literal: true

files_path = `git diff --name-only origin/master..`
files_path = files_path.split("\n").select { |f| f.end_with?('.rb') }

METHODS = %w(
  <<
  .push
  .gsub!
  .concat
  .tr!
  .delete
  .clear
  .map!
  .slice!
).freeze

def detect_method(path)
  clean = true
  File.read(path).each_line.with_index do |line, number|
    METHODS.each do |m|
      if line.include?(m)
        clean = false
        puts "check: #{path}:#{number + 1} - #{line.gsub(m, "** #{m} **")}"
      end
    end
  end
  clean
end

clean = []
files_path.each do |path|
  clean << path if detect_method(path)
end

puts 'vvvvvv-clean-vvvvvvv'
puts clean