You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: help_mode.rb
    path of file: ./repos/textbringer/lib/textbringer/modes
    
    the code of the file until where you have to start completion: module Textbringer
  class HelpMode < Mode
    define
    
    def jump_to_link
      @buffer.save_excursion do
        @buffer.skip_re_backward(/[_a-zA-Z0-9]/)
        if @buffer.char_before == ?[ &&
            @buffer.looking_at?(/([_a-zA-Z][_a-zA-Z0-9]*)\]/)
          describe_command(match_string(1))
        else
          @buffer.beginning_of_line
          if @buffer.looking_at?(/^(\S*?):(\d+)$/)
            file_name = @buffer.match_string(1)
            line_number = @buffer.match_string(2).to_i
            find_file(file_name)
            goto_line(line_number)
          end
        end