Re: [QUIZ] Befunge (#184)

My take on it (in ruby 1.8.6 on leopard), please tell me of unrubyesqe  
(that a word?) idioms I've used.

It's less terse than it could have been but I like how it let me  
define the operations (see below) and it's fun to watch in debug mode!

My definitions:
   Directions = {
     ?^ => :up,
     ?> => :right,
     ?< => :left,
     ?v => :down
   }

   [?+, ?-, ?*, ?/, ?%].each do |ch|
     mk_i(ch) { push arg2.send(ch.chr.to_sym, arg1) }
   end

   Directions.each do |ch, dir|
     mk_i(ch) { turn dir }
   end

   (?0..?9).each do |i|
     mk_i(i) { push i.chr.to_i }
   end

   mk_i(?!)  { push arg1.zero? ? 1 : 0 }
   mk_i(??)  { turn Directions.values[rand(4)] }
   mk_i(?_)  { turn(arg1 == 0 ? :right : :left) }
   mk_i(?|)  { turn(arg1 == 0 ? :down : :up) }
   mk_i(?")  { toggle_stringmode }
   mk_i(?:)  { push arg1, arg1 }
   mk_i(?\\) { push arg1, arg2 }
   mk_i(?$)  { arg1 } # discard
   mk_i(?.)  { output arg1.to_s + " " }
   mk_i(?,)  { output arg1.chr }
   mk_i(?#)  { step }
   mk_i(?g)  { push instruction_get(arg2, arg1) }
   mk_i(?p)  { instruction_set(arg2, arg1, arg3) }
   mk_i(?&)  { push get_int }
   mk_i(?~)  { push get_chr }
   mk_i(?@)  { stop }
   mk_i(?\ ) {  } #nop
   mk_i(?`)  { push(arg2 > arg1 ? 1 : 0) }


Full solution attached, run with `ruby -d befunge2.rb [input_file]` to  
see what's going on, `ruby befunge.rb [input_file]` to just run  
normally.
Requires the highline gem, `sudo install highline`. That was the only  
way I found to get characters from STDIN without the user having to  
press enter after. The paging I use is very primitive though, is there  
a way to make a console-app more usable, like non-blocking input  
without manual threads, and printing at specific co-ordinates of the  
terminal without having to send weird control sequences? How would you  
write `less` in ruby? is there an example somewhere?

Having an exception signal normal halt is not very nice, I agree, but  
this is a hack.






einarmagnus