class Utils::Grepper

def match_lines(file)
  for line in file
    if m = @pattern.match(line)
      @skip_pattern and @skip_pattern =~ line and next
      line[m.begin(0)...m.end(0)] = black on_white m[0]
      @queue and @queue << line
      case
      when @args[?l]
        @output << @filename
      when @args[?L], @args[?r], @args[?g]
        @output << "#{@filename}:#{file.lineno}"
      when @args[?e], @args[?E]
        @output << "#{@filename}:#{file.lineno}"
        break
      else
        @output << red("#{@filename}:#{file.lineno}")
        if @args[?B] or @args[?C]
          @output.concat @queue.data
        else
          @output << line
        end
        if @args[?A] or @args[?C]
          where = file.tell
          lineno = file.lineno
          @queue.max_size.times do
            file.eof? and break
            line = file.readline
            @queue << line
            @output << line
          end
          file.seek where
          file.lineno = lineno
        end
      end
    else
      @queue and @queue << line
    end
  end
end