A small ruby script that checks if all the .rb files in the given project starts with "# encoding: utf-8"

check_header_utf8.rb

# encoding: utf-8
class String
  def starts_with?(prefix)
    prefix = prefix.to_s
    self[0, prefix.length] == prefix
  end
end
all_files = Dir["./**/*.rb"]

all_files.each do |file|
  begin
    first_line = File.open file, &:readline
    if !first_line.starts_with? "# encoding: utf-8"
      puts file
      content = File.readlines(file)
      content.insert(0, "# encoding: utf-8\n")
      File.open(file, "w") { |f| 
        content.each { |line|
          f << line
        }   
      }
      # return 0
    end
  rescue
    puts "Erro ao ler file: #{file}"
    raise $!
  end
end