lonst.rb

#! /usr/bin/env ruby

require 'optparse'
require 'readline'
require 'yaml'

defname  = 'lonst_session.yml'
Readline.vi_editing_mode

OptionParser.new do |opt|
  opt.banner = "#{__FILE__} [option]"
  opt.separator ' '
  opt.on('-f', '--file=FILENAME', 'Set using data file name') {|name| fname = name }
  opt.on('-v', 'Set vim input mode [default]') {|vim| vim and Readline.vi_editing_mode }
  opt.on('-e', 'Set emacs input mode') {|emacs| emacs and Readline.emacs_editing_mode }
  opt.on('--delete_session', "Delete original session file (#{defname})") do |delete|
    if delete && File.exist?(defname)
      File.delete(defname)
    end
  end
  opt.on('-h', '--help', 'You\'re looking at it') { puts opt; exit }
  opt.parse!
end

fname ||= defname
source = Readline::HISTORY
ask = lambda do |q|
  idea = Readline.readline(q, true)
  source.pop if source[-1].empty? || source.count(idea) == 2
end

if File.exist?(fname)
  File.open(fname) do |f|
    YAML.load(f.read).each do |idea|
      source << idea
    end
  end
end

ask['seed: '] while source.size < 2

begin
  loop do
    idea, flavor = source.to_a.shuffle.take(2)
    unless idea == flavor
      puts
      puts "#{idea} x #{flavor}"
      ask['> ']
    end
  end
rescue Interrupt
  File.open(fname, 'wb') do |f|
    f.puts YAML.dump(source.to_a)
  end
end