Tetris computer craft

term.clear()
sleep(0.1)
wt = 0
width, height = term.getSize()
width = width/2
height = height/2
os.pullEvent = os.pullEventRaw
function blockstart()
 -- Telling it to draw the shape
 term.setCursorPos(spw1, sph1)
 write("#")
 term.setCursorPos(spw2, sph2)
 write("#")
 term.setCursorPos(spw3, sph3)
 write("#")
 term.setCursorPos(spw4, sph4)
 write("#")
 end
function newblock()
 --Setting Rotation to 1
 rot = 1
 -- Shape
 local bshape = math.ceil(math.random(0,3))
 if bshape == 0 then
  shape = "square"
  end
 if bshape == 1 then
  shape = "line"
  end
 if bshape == 2 then
  shape = "l"
  end
 if bshape == 3 then
  shape="hill"
  end
 startposw = width/2
 startposh = 1
 -- setting what shapes look like
 if shape == "hill" then
  spw1 = startposw
  spw2 = spw1 -1
  spw3 = spw1 +1
  spw4 = spw1
  sph1 = startposh
  sph2 = sph1 -1
  sph3 = sph1 -1
  sph4 = sph1 -1
  blockstart()
  end
 if shape == "l" then
  spw1 = startposw
  spw2 = spw1
  spw3 = spw1
  spw4 = spw3 +1
  sph1 = startposh
  sph2 = sph1 -1
  sph3 = sph2 -1
  sph4 = sph3
  blockstart()
  end
 if shape == "line" then
  spw1 = startposw
  spw2 = spw1
  spw3 = spw1
  spw4 = spw1
  sph1 = startposh
  sph2 = sph1 -1
  sph3 = sph2 -1
  sph4 = sph3 -1
  blockstart()
  end
 if shape == "square" then
  spw1 = startposw
  spw2 = spw1 +1
  spw3 = spw1
  spw4 = spw2
  sph1 = startposh
  sph2 = sph1
  sph3 = sph1 -1
  sph4 = sph1 -1
  blockstart()
  end
 end
function updateblock()
 if wt ~= 4 then
  wt = wt +1
  end
 if wt == 4 then
  sph1 = sph1 -1
  sph2 = sph2 -1
  sph3 = sph3 -1
  sph4 = sph4 -1
  blockstart()
  end
 end
function rotl()
 if rot == 1 then
  rot = 4
  if shape == "hill" then
  spw3 = spw1
  spw1 = spw2
  spw4 = spw4
  spw2 = spw4
  sph3 = sph1
  sph1 = sph2
  sph4 = sph4
  sph2 = sph4 -1
  end
 if shape == "square" then
  end
 if shape == "line" then
  spw3 = spw4 -1
  spw2 = spw3 -1
  spw1 = spw2 -1
  spw4 = spw4
  sph1 = sph4
  sph2 = sph4
  sph3 = sph4
  sph4 = sph4
  end
 if shape == "l" then
  sph4 = sph2
  sph2 = sph3
  sph1 = sph3
  sph3 = sph3
  spw2 = spw3 -1
  spw1 = spw2 -1
  spw4 = spw3
  spw3 = spw3
  end
 end
 if rot == 4 then
  rot = 3
  if shape == "hill" then
  spw3 = spw1
  spw1 = spw2
  spw4 = spw4
  spw2 = spw4 +1
  sph3 = sph1
  sph1 = sph2
  sph2 = sph4
  sph4 = sph4
  end
 if shape == "square" then
  end
 if shape == "line" then
  spw1 = spw4
  spw2 = spw4
  spw3 = spw4
  spw4 = spw4
  sph3 = sph4 -1
  sph2 = sph3 -1
  sph1 = sph2 -1
  sph4 = sph4
  end
 if shape == "l" then
  spw4 = spw4
  spw3 = spw4 +1
 spw2 = spw3
 spw1 = spw3
 sph4 = sph4
 sph3 = sph4
 sph2 = sph4 -1
 sph1 = sph2 -1
 end
end
 if rot == 3 then
  rot = 2
 if shape == "l" then
  sph4 = sph2
  sph2 = sph3
  sph1 = sph3
  sph3 = sph3
  spw2 = spw3 +1
  spw1 = spw2 +1
  spw4 = spw4
  spw3 = spw3
  end
 if shape == "square" then
  end
 if shape == "line" then
  spw3 = spw4 +1
  spw2 = spw3 +1
  spw1 = spw2 +1
  spw4 = spw4
  sph3 = sph4
  sph2 = sph4
  sph1 = sph4
  sph4 = sph4
  end
 if shape == "hill" then
  spw3 = spw1
  spw1 = spw2
  spw2 = spw4
  spw4 = spw4
  sph3 = sph1
  sph1 = sph4
  sph2 = sph4 +1
  sph4 = sph4
  end
 end
 if rot == 2 then
  rot = 1
 if shape == "square" then
  end
 if shape == "line" then
  spw1 = spw4
  spw2 = spw4
  spw3 = spw4
  spw4 = spw4
  spw3 = spw4 +1
  spw2 = spw3 +1
  spw1 = spw2 +1
  end
 if shape == "hill" then
  spw3 = spw1
  spw1 = spw2
  spw2 = spw4 -1
  spw4 = spw4
  sph3 = sph4
  sph2 = sph4
  sph1 = sph4 +1
  end
 if shape == "l" then
  end
 end
end
function update()
 updateblock()
 os.startTimer(.1)
 end
newblock()
timer1 = os.startTimer(.1)
while true do
 event , varx = os.pullEvent()
 if event == "timer" then
  if varx == "timer1" then
   update()
   end
  end
 if event == "char" then
  if varx == "a" then
   rotl()
   end
 if varx == "e" then
  break
  end
 end
end