ToDo List example from Reddit thread:http://www.reddit.com/r/ruby/comments/udrkh/benchmarking_proficiency_in_ruby/

todo.rb

class ToDoList
  
  def initialize  
    puts "What's your name, good sir?"
    name = gets.strip
    puts greeting(name) #this uses the greeting below
  
    puts "1.) Make A To-Do List \n2.) Load A To-Do List\n"
    while do_action = gets.chomp
      case do_action
      when "1"
        make_list #this should optionally take params, like name.
      when "2"
        get_list #This should ask for a file name that gets passed as a param to the 'get_list' method like get_list('grocery')
      else
        puts "I'm sorry, I don't understand. You can only enter from the options! :)"
      end
    end
  end
  
  def greeting(name)
    unless name.nil?
      case Time.now.hour
        when (6...12) 
          time_phase = "morning"
        when (12...16) 
          time_phase = "afternoon"
        when (16...20) 
          time_phase = "evening"
        when (20..24) || (1...6) 
          time_phase = "night"
      end
      return "\nGood #{time_phase}, Master #{name}! What would you like me to do?"
    end
  end
  
  #OK...so these methods are terrible. I don't have time to refactor them and they should be broken up into multiple methods, one for each 'concern' or action
  #Also, the if/case statements are a terrible mess. I'll finish the refactor later so you can see a better way to do this.
  def make_list
    puts "Okay! What name would you like to name the list?"
    topic_header = gets.chomp.upcase 
    file = File.new("#{topic_header}.txt", 'w') 
    file << "//////////////////////////     #{topic_header}     ////////////////////////// \n"
    puts "\nAlright, #{name}! \nTemme the list items!"
    i = 0
    i2 = 0
    i3 = 0
    while input = gets
     i += 1
     if input =~ /^END/
       # if i == 1 
       # 	num_tasks = "task"
       # elsif i == 2
       # 	num_tasks = "task"
       # else
       # 	num_tasks = "tasks"
       # end
       file << "\n----------------------------------------------------------------------------------------------------------------------"
       file << "\n #{"#"*i} Main Tasks: \t Total: #{i - 1}     Fin: 0     left: #{i - 1}"
       file << "\n #{"#"*i} Sub Tasks: \t\t Total:#{i2}     Fin:0     left:#{i2}"
       file << "\n----------------------------------------------------------------------------------------------------------------------"
       break
     end
       puts ">> " + input
       file << "\n#{i}.) " + input.strip + " [_] \n"
       puts "Would you like any other items under this? Please answer in yes or no."
       do_action2 = gets.chomp
       case do_action2.downcase
         when 'yes'
           i2 -= 1
           #i3 -= 1
           puts "Okay! Tell me then!"
           while input2 = gets
             i2 += 1
             #i3 += 1
             if input2 =~ /^END/
               #file << "\n\t#{i3} tasks, 0 finished, #{i3} left.\n"
               #i3 = 0
               break 
             end
             puts ">> \t" + input2
             file << "\t #{i2 + 1}-> " + input2.strip + " ||\n"
           end
           puts "Enter the next list item!"	
         when 'no'
           puts "Okay, as you wish!"
           puts "Enter the next list item then!"
         else
           puts "Awwwwhhh man...you shouldn't have done that. Program terminating in 3..2..1"
           return
       end
     end
     puts "Alrighto, #{name}o! Your to-do list has been prepared using Ruby magic. Goodbye for now! :D"
     file.close
     break 
 
  end 
  
  def get_list
    puts "Which file would you like to read, bro?"
      #1) you could even use the Ruby "File" lib here (in place of IO) to list files in 
      #   the current dir and choose one.
      #2) This is extremely error-prone. What if they enter a non-existent file? An integer? etc.
      commnd = gets.strip 
      filelines = IO.readlines("#{commnd}.txt") 
      puts "\nYour file has been loaded, good sir. What would you like to do with it?\n\n"

      # OK.. so there are at least 2 better ways to structure this:
      # 1) Break the various actions into methods (i.e. "list_tasks","number_tasks_remaining",etc)
      #    and call them inside 'get_list'
      # 2) Keep this code below as a method, but pass the action in as a parameter (i.e. list_action(params) )
      puts "1.) List the number of tasks left. \n2.) List each task. \n3.) List completed tasks. \n4.) List incomplete tasks. \n5.) Mark a task complete."
      while do_action3 = gets.strip
        case do_action3
        when "1"
          if filelines[-3] =~ /Main Tasks/
            puts filelines[-3]
          else
            puts "Sorry, this file doesn't specify main tasks."
          end
          if filelines[-2] =~ /Sub Tasks/
            puts filelines[-2]
          else
            puts "Sorry, this file doesn't specify sub tasks."
          end
          break
        when "2"
          $task_lines = []
          def capture_task(val)
            $task_lines << val
          end
          i4 = 0
          filelines.each do |line|
            i4 += 1
            if line =~ /\.\)/ || line =~ /->/
              if line =~ /\.\)/
                puts "\n" + line
              elsif line =~ /->/
                puts line
              end
              capture_task(line)
            end
          end
          if $task_lines[0] == $task_lines[-1]
            puts "No tasks found."
          end
          break
        when "3"
          $fin_lines = []
          def capture_fin(val)
            $fin_lines << val
          end
          filelines.each do |fin_task|
            if fin_task =~ /\[X\]/ || fin_task =~ /\|X\|/ 
              puts fin_task
              capture_fin(fin_task)
            #else
              #puts "Looks like you haven't completed anything!" if fin_task == filelines[-1]
            end
          end
          if $fin_lines[0] == $fin_lines[-1] && $fin_lines[0].class != String
            puts "No completed tasks found!"
          end
          break
        when "4"
          $left_lines = []
          def capture_left(val)
            $left_lines << val
          end
          filelines.each do |left_task|
            if left_task =~ /\[_\]/ || left_task =~ /\|\|/ 
              puts left_task
              capture_left(left_task)
            #else
              #puts "Looks like you've completed everything!" if left_task == filelines[-1]
            end
          end
          if $left_lines[0] == $left_lines[-1] && $left_lines[0].class != String
            puts "No incomplete tasks found!"
          end
          break
        when "5"
          puts "Which task would you like to mark as completed?"
          filelines.each do |left_task|
            puts left_task if left_task =~ /\[_\]/ || left_task =~ /\|\|/
          end
          numenum = (total_tasks, fin_tasks, left_tasks = filelines[-3].scan(/\d+/).each)
          subnumenum = (total_subtasks, fin_subtasks, left_subtasks = filelines[-2].scan(/\d+/).each)
          total_tasks, total_subtasks = numenum.next.to_i, subnumenum.next.to_i 
          fin_tasks, fin_subtasks = numenum.next.to_i, subnumenum.next.to_i 
          left_tasks, left_subtasks = numenum.next.to_i, subnumenum.next.to_i 
          # puts total_tasks
          # puts fin_tasks
          # puts left_tasks
          while do_action4 = gets.chomp 
            if do_action4 =~ /^END/
              file2 = File.new("#{commnd}.txt", "w")
              file2.puts $capt_fin
              break
            else
              if do_action4 =~ /\.\)/
                fin_tasks += 1
                left_tasks -= 1
                total_tasks = fin_tasks + left_tasks
              elsif do_action4 =~ /->/
                fin_subtasks += 1
                left_subtasks -= 1
                total_subtasks = fin_subtasks + left_subtasks
              end
      
              puts "Do you want to mark another task as completed?"
              $capt_fin = []
            end
            if do_action4 =~ /\.\)/
              do_action4.gsub!(/\./, '\.')
              do_action4.gsub!(/\)/, '\)')
            end
            if do_action4 =~ /->/
              if do_action4.length == 3
                do_action4 = " " + do_action4
              end
            end
      
            filelines.each do |left_task|
              if left_task =~ Regexp.new(do_action4) 
                if left_task =~ /\.\)/
                  left_task.gsub!(/\[_\]/,"[X] \t\t(DONE MOFO!)")
                  puts "BTW, Congratulations for finishing a main task! :D"
                  # fin_tasks += 1
                  # left_tasks -= 1
                  # total_tasks = fin_tasks + left_tasks
                  # filelines[-3].gsub!(Regexp.new("Fin:" + (fin_tasks - 1).to_s), "Fin:#{fin_tasks}")
                  # filelines[-3].gsub!(Regexp.new("left:" + (left_tasks - 1).to_s), "#left:{left_tasks}")
                elsif left_task =~ /->/
                   left_task.gsub!(/\|\|/, "|X|")	
                   puts "BTW, you're one step ahead! :D"							
                end 
                $capt_fin << left_task
              elsif left_task =~ /Main Tasks/
                left_task.gsub!(Regexp.new("Fin: " + (fin_tasks - 1).to_s), "Fin: #{fin_tasks}")
                left_task.gsub!(Regexp.new("left: " + (left_tasks + 1).to_s), "left: #{left_tasks}")	
                $capt_fin << left_task
              elsif left_task =~ /Sub Tasks/
                left_task.gsub!(Regexp.new("Fin: " + (fin_subtasks - 1).to_s), "Fin: #{fin_subtasks}")
                left_task.gsub!(Regexp.new("left: " + (left_subtasks + 1).to_s), "left: #{left_subtasks}")
                $capt_fin << left_task
              else
                $capt_fin << left_task
              end
            end
          end
          break
        end
      end
      break  
  end
  
end