Advent of code 2016 day 1

@posx=0
@posy=0
orient="N"
step=0
part2=0
#    N
#  W   E
#    S
move={
   "N"=>lambda {|num|@posy=@posy+num},
   "S"=>lambda {|num|@posy=@posy-num},
   "E"=>lambda {|num|@posx=@posx+num},
   "W"=>lambda {|num|@posx=@posx-num}
   }
orientation={
  "N"=>{"R"=>"E","L"=>"W"},
  "S"=>{"R"=>"W","L"=>"E"},
  "E"=>{"R"=>"S","L"=>"N"},
  "W"=>{"R"=>"N","L"=>"S"}
}
visited=Hash.new
File.read("day1.input").split(', ').each {|direction|
    orient = orientation[orient][direction[0]]
    oldx,oldy=@posx,@posy
    move[orient].call(direction[1..-1].to_i)
    #Retracing steps
    ([oldx,@posx].min..[oldx,@posx].max).each {|x|
        ([oldy,@posy].min..[oldy,@posy].max).each {|y|
            if visited[x.to_s+','+y.to_s] and visited[x.to_s+','+y.to_s]<step-1 and part2==0
                puts "Hey, I was already there at step "+visited[x.to_s+','+y.to_s].to_s
                part2=(x.abs+y.abs)
                puts "That's "+part2.to_s+" blocks from where I started"
            else
                visited[x.to_s+','+y.to_s]=step
            end
        }
    }
    step=step+1
}
puts "I am now "+ (@posx.abs+@posy.abs).to_s+" blocks from where I started"