Snake

local totalX = 32
local totalY = 27
local grid = {}
local snakeTail = {}
local snakeSize = 0
local snakeX = 1
local snakeY = 1
local output = ""
local fruitIcon = "•"
local snakeIcon = "@"
local clock = os.clock

function makeGrid()
   for x=1,totalY do
      grid[x] = {}
      for y=1,totalX do
         grid[x][y] = " "
      end
   end
end

function sleep(secs)
   local timePoint = clock()
   while clock() - timePoint <= secs do end
end

while true do
   fruitX = math.random(totalY)
   fruitY = math.random(totalX)
   snakeSize = snakeSize + 1

   while snakeX ~= fruitX or snakeY ~= fruitY do

      makeGrid()
      table.insert(snakeTail,1,{snakeX,snakeY})

      while snakeSize < #snakeTail do
         table.remove(snakeTail,#snakeTail)
      end

      grid[snakeX][snakeY] = snakeIcon

      for k=1,#snakeTail do
         grid[snakeTail[k][1]][snakeTail[k][2]] = snakeIcon
      end

      if totalX < totalY then

         if snakeX > fruitX and snakeY == fruitY then
            snakeX = snakeX - 1
         end

         if snakeX < fruitX and snakeY == fruitY then
            snakeX = snakeX + 1
         end

         if snakeY > fruitY then
            snakeY = snakeY - 1
         end

         if snakeY < fruitY then
            snakeY = snakeY + 1
         end
      else

         if snakeY > fruitY and snakeX == fruitX then
            snakeY = snakeY - 1
         end

         if snakeY < fruitY and snakeX == fruitX then
            snakeY = snakeY + 1
         end

         if snakeX > fruitX then
            snakeX = snakeX - 1
         end

         if snakeX < fruitX then
            snakeX = snakeX + 1
         end
      end

      grid[fruitX][fruitY] = fruitIcon

      for l=1,#snakeTail do
         if snakeTail[l][1] == snakeX and snakeTail[l][2] == snakeY then
            snakeSize = 1
         end
      end

      output = ""
      os.execute("cls")

      for i=1,totalY do
         for j=1,totalX do
            output = output .. grid[i][j]
         end

         output = output .. "\n"
      end
      print(output)
      sleep(0.3)
   end
end