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def history(how_many = 50) history_size = Readline::HISTORY.size # no lines, get out of here puts "No history" and return if history_size == 0 start_index = 0 # not enough lines, only show what we have if history_size <= how_many how_many = history_size - 1 end_index = how_many else end_index = history_size - 1 # -1 to adjust for array offset start_index = end_index - how_many end start_index.upto(end_index) {|i| print_line i} nil end alias :h :history # -2 because -1 is ourself def history_do(lines = (Readline::HISTORY.size - 2)) irb_eval lines end alias :h! :history_do def history_write(filename, lines) file = File.open(filename, 'w') get_lines(lines).each do |l| file << "#{l}\n" end file.close end alias :hw :history_write private def get_line(line_number) Readline::HISTORY[line_number] end def get_lines(lines = []) return [get_line(lines)] if lines.is_a? Fixnum out = [] lines = lines.to_a if lines.is_a? Range lines.each do |l| out << Readline::HISTORY[l] end return out end def print_line(line_number, show_line_numbers = true) print line_number + ": " if show_line_numbers puts get_line(line_number) end def irb_eval(lines) to_eval = get_lines(lines) to_eval.each {|l| Readline::HISTORY << l} eval to_eval.join("\n") end

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