Refactoring excercise. Make this thrashing leviathan of code into something a bit more understandable, before it devours us all.

adventure.rb

# I'm so, so sorry.

class Adventure

  def run
    @location = :north
    puts "You are in a maze of twisty little passages, all alike"
    puts "What do you do?"

    result = gets.chomp
    if result == "HELP"
      puts "Here are the accepted commands:"
      puts "NORTH to go NORTH"
      puts "SOUTH to go SOUTH"
      puts "EAST to go EAST"
      puts "WEST to go WEST"
      puts "INVENTORY to see what you are carrying"
      puts "LOOK to see what you can see"
      puts "PICK UP to pick something up"
    elsif result == "NORTH" || result == "EAST" || result == "WEST"
      puts "You can't go that way!"
    elsif result == "SOUTH"
      @location = :south
      puts "It is dark here. You are likely to be eaten by a grue."
    elsif result == "INVENTORY"
      puts "You have a lantern. It has no oil in it."
      if @hat_on_head
        puts "A jaunty hat rests upon your head."
      end
    elsif result == "LOOK" && !@hat_on_head
      puts "You can see a hat on the ground."
    else
      puts "I don't understand that."
    end

    puts "What do you do?"
    result = gets.chomp
    if result == "HELP"
      puts "Here are the accepted commands:"
      puts "NORTH to go NORTH"
      puts "SOUTH to go SOUTH"
      puts "EAST to go EAST"
      puts "WEST to go WEST"
      puts "INVENTORY to see what you are carrying"
      puts "LOOK to see what you can see"
      puts "PICK UP to pick something up"
    elsif result == "SOUTH" && @location == :south
      puts "You can't go that way!"
    elsif result == "SOUTH"
      @location = :south
      puts "It is dark here. You are likely to be eaten by a grue."
    elsif result == "NORTH" && @location == :south
      @location = :north
      puts "You are in a maze of twisty little passages, all alike"
    elsif result == "EAST" && @location == :south
      puts "You have been eaten by a grue."
      return false
    elsif result == "EAST" || result == "WEST"
      puts "You can't go that way!"
    elsif result == "INVENTORY"
      puts "You have a lantern. It has no oil in it."
      if @hat_on_head
        puts "A jaunty hat rests upon your head."
      end
    elsif result == "LOOK" && !@hat_on_head
      puts "You can see a hat on the ground."
    elsif result == "PICK UP"
      @hat_on_head = true
      puts "You pick up the hat."
    else
      puts "I don't understand that."
    end

    puts "What do you do?"
    result = gets.chomp
    if result == "HELP"
      puts "Here are the accepted commands:"
      puts "NORTH to go NORTH"
      puts "SOUTH to go SOUTH"
      puts "EAST to go EAST"
      puts "WEST to go WEST"
      puts "INVENTORY to see what you are carrying"
      puts "LOOK to see what you can see"
      puts "PICK UP to pick something up"
    elsif result == "SOUTH" && @location == :south
      puts "You can't go that way!"
    elsif result == "SOUTH"
      @location = :south
      puts "It is dark here. You are likely to be eaten by a grue."
    elsif result == "NORTH" && @location == :south
      @location = :north
      puts "You are in a maze of twisty little passages, all alike"
    elsif result == "EAST" && @location == :south
      puts "You have been eaten by a grue."
      return false
    elsif result == "EAST" || result == "WEST"
      puts "You can't go that way!"
    elsif result == "INVENTORY"
      puts "You have a lantern. It has no oil in it."
      if @hat_on_head
        puts "A jaunty hat rests upon your head."
      end
    elsif result == "LOOK" && !@hat_on_head
      puts "You can see a hat on the ground."
    elsif result == "LOOK"
      puts "You can't see anything around here."
    elsif result == "PICK UP"
      @hat_on_head = true
      puts "You pick up the hat."
    else
      puts "I don't understand that."
    end

    puts "What do you do?"
    result = gets.chomp
    if result == "HELP"
      puts "Here are the accepted commands:"
      puts "NORTH to go NORTH"
      puts "SOUTH to go SOUTH"
      puts "EAST to go EAST"
      puts "WEST to go WEST"
      puts "INVENTORY to see what you are carrying"
      puts "LOOK to see what you can see"
      puts "PICK UP to pick something up"
    elsif result == "SOUTH" && @location == :south
      puts "You can't go that way!"
    elsif result == "SOUTH"
      @location = :south
      puts "It is dark here. You are likely to be eaten by a grue."
    elsif result == "NORTH" && @location == :south
      @location = :north
      puts "You are in a maze of twisty little passages, all alike"
    elsif result == "EAST" && @location == :south
      puts "You have been eaten by a grue."
      return false
    elsif result == "EAST" || result == "WEST"
      puts "You can't go that way!"
    elsif result == "INVENTORY"
      puts "You have a lantern. It has no oil in it."
      if @hat_on_head
        puts "A jaunty hat rests upon your head."
      end
    elsif result == "LOOK" && !@hat_on_head
      puts "You can see a hat on the ground."
    elsif result == "LOOK"
      puts "You can't see anything around here."
    elsif result == "PICK UP"
      @hat_on_head = true
      puts "You pick up the hat."
    else
      puts "I don't understand that."
    end

    puts "What do you do?"
    result = gets.chomp
    if result == "HELP"
      puts "Here are the accepted commands:"
      puts "NORTH to go NORTH"
      puts "SOUTH to go SOUTH"
      puts "EAST to go EAST"
      puts "WEST to go WEST"
      puts "INVENTORY to see what you are carrying"
      puts "LOOK to see what you can see"
      puts "PICK UP to pick something up"
    elsif result == "SOUTH" && @location == :south
      puts "You can't go that way!"
    elsif result == "SOUTH"
      @location = :south
      puts "It is dark here. You are likely to be eaten by a grue."
    elsif result == "NORTH" && @location == :south
      @location = :north
      puts "You are in a maze of twisty little passages, all alike"
    elsif result == "EAST" && @location == :south
      puts "You have been eaten by a grue."
      return false
    elsif result == "EAST" || result == "WEST"
      puts "You can't go that way!"
    elsif result == "INVENTORY"
      puts "You have a lantern. It has no oil in it."
      if @hat_on_head
        puts "A jaunty hat rests upon your head."
      end
    elsif result == "LOOK" && !@hat_on_head
      puts "You can see a hat on the ground."
    elsif result == "LOOK"
      puts "You can't see anything around here."
    elsif result == "PICK UP"
      @hat_on_head = true
      puts "You pick up the hat."
    else
      puts "I don't understand that."
    end

    puts "What do you do?"
    result = gets.chomp
    if result == "HELP"
      puts "Here are the accepted commands:"
      puts "NORTH to go NORTH"
      puts "SOUTH to go SOUTH"
      puts "EAST to go EAST"
      puts "WEST to go WEST"
      puts "INVENTORY to see what you are carrying"
      puts "LOOK to see what you can see"
      puts "PICK UP to pick something up"
    elsif result == "SOUTH" && @location == :south
      puts "You can't go that way!"
    elsif result == "SOUTH"
      @location = :south
      puts "It is dark here. You are likely to be eaten by a grue."
    elsif result == "NORTH" && @location == :south
      @location = :north
      puts "You are in a maze of twisty little passages, all alike"
    elsif result == "EAST" && @location == :south
      puts "You have been eaten by a grue."
      return false
    elsif result == "EAST" || result == "WEST"
      puts "You can't go that way!"
    elsif result == "INVENTORY"
      puts "You have a lantern. It has no oil in it."
      if @hat_on_head
        puts "A jaunty hat rests upon your head."
      end
    elsif result == "LOOK" && !@hat_on_head
      puts "You can see a hat on the ground."
    elsif result == "LOOK"
      puts "You can't see anything around here."
    elsif result == "PICK UP"
      @hat_on_head = true
      puts "You pick up the hat."
    else
      puts "I don't understand that."
    end

    puts "You have died of starvation."
  end

end


Adventure.new.run