Adding a timer to my Lua program -

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i'm new lua , i'm coding program. program letter going around , collecting other letters (kinda worm program). however, want timed. (i'm on computercraft mod minecraft still uses lua, don't think matters) i'm using os.pullevent( "key" ) can move letter, os.pullevent() pause program until it's satisfied. problem want timer ticking @ same time. ideas how this? thanks!

term.clear() w = 1 h = 1 score = 0 function topline()   term.settextcolor(colors.orange)   term.setcursorpos(5,1)   print("score: ", score) end   function randloc()   w,h = math.random(2,50) , math.random(3,17)   term.setcursorpos(w,h)   term.settextcolor(colors.red)   print"o" end   function drawborder()   term.settextcolor(colors.blue)   term.setcursorpos(1,2)   print"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"x                                                 x"   print"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" end function checktouch()   if x ~= w or y ~= h     term.setcursorpos(w,h)     term.settextcolor(colors.red)     print"o"     elseif x == w , y == h     w,h = math.random(2,50) , math.random(3,17)     term.setcursorpos(w,h)     term.settextcolor(colors.red)     print"o"     score=score+1   end end                 x = 2 y = 3 randloc() while true   topline()    drawborder()   checktouch()   term.setcursorpos(x,y)   term.settextcolor(colors.lime)   print"t"   local e,move = os.pullevent( "key" )     if move == 30 or move == 203     x=x-1     if x <= 1       x = 2     end   end   if move == 32 or move == 205     x=x+1     if x >= 51       x = 50     end   end   if move == 31 or move == 208     y=y+1     if y >= 18       y = 17     end   end   if move == 17 or move == 200     y=y-1     if y <= 2       y = 3     end   end     term.clear() end

you can use os.starttimer() generate "timer" event call os.pullevent()

see computercraft os api documentation


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