View difference between Paste ID: DtdK4fHF and jTywfKtC

 print('Choose mode (debug, prod) : ')
 choice = read()
 
 if choice == "debug" then
     screen = peripheral.wrap("left")
     debug = peripheral.wrap("bottom")
 else
     screen = peripheral.wrap("monitor_0")
     debug = peripheral.wrap("monitor_1")
 end
 width, height = screen.getSize()
 symbols = {"x", "+", "*"}
 max_star = 5
 
 tail_length = 3
 
 function draw_tail(base_pos, dir)
     local tail_char = ""
     local side = 0
     if dir == "W" then
         tail_char = "/"
         side = 1
     else
         tail_char = "\\"
         side = -1
     end
     for l=1,tail_length,1 do
         local m_x = base_pos.x + (side * l)
         local m_y = base_pos.y - (1 * l)
         screen.setCursorPos(m_x, m_y)
         screen.write(tail_char)
     end
 end
 
 borne = {min=-4, max=width+4}
 borne.middle = borne.max / 2
 
 function generate_meteor(speed)
     x_pos = math.random(borne.min, borne.max)
     n_dir = ""
     if x_pos < borne.middle  then n_dir="E" else n_dir="W" end
     meteor = {pos={x=x_pos,y=-3}, speed=speed, direction=n_dir}
     debug.setCursorPos(1,1)
     debug.write(meteor.direction)
     debug.setCursorPos(1,2)
     debug.write("X : "..meteor.pos.x.."/ Y : "..meteor.pos.y)
     return meteor
 end
 
 function update_meteor(meteor)
     if meteor.direction == "W" then
         meteor.pos.x = meteor.pos.x - meteor.speed
     else
         meteor.pos.x = meteor.pos.x + meteor.speed
     end
     meteor.pos.y = meteor.pos.y + meteor.speed
     screen.setCursorPos(meteor.pos.x, meteor.pos.y)
     screen.write("O")
     draw_tail(meteor.pos, meteor.direction)
    	-- print(meteor.pos.x, meteor.pos.y)
     -- sleep(0.1)
 end
 
 m1 = generate_meteor(1)
 
 function init_star_tab(star_count)
     tab = {index=1, list={}}
     for i=1, star_count,1 do
         rand_x = math.random(1, width)
         rand_y = math.random(1, height)
         tab.list[i] = {rand_x, rand_y}
     end
     return tab
 end
 
 start_char = {"/", "|", "\\"}
 end_char = {"\\", "|", "/"}
 
 function draw_cadre(text_pos, text_w)
     start_height = text_pos.y - 1
     for h=0,2,1 do
         new_line = ""
         new_line = start_char[h+1]..new_line
         for w=1,text_w,1 do
             new_line = new_line.."-"
         end
         new_line = new_line..end_char[h+1]
         screen.setCursorPos(text_pos.x-1, start_height+h)
         screen.write(new_line)
     end
 end
 
 function text_middle_screen(text)
     t_w = #text / 2
     s_w = (width / 2) - (t_w)
     s_h = (height / 2) - 1
     -- screen.setCursorPos(s_w, s_h)
     draw_cadre({x=s_w,y=s_h}, #text )
     screen.setCursorPos(s_w, s_h)
     screen.write(text)
 end
 
 
 function addStar(star_arr)
     for i=1, #star_arr.list, 1 do
         if i == star_arr.index then
             pos_x = math.random(1,width)
             pos_y = math.random(1,height)
             star_arr.list[i] = {pos_x, pos_y}
         end
         next_x = star_arr.list[i][1]
         next_y = star_arr.list[i][2]
         screen.setCursorPos(next_x, next_y)
         random_symbol = symbols[math.random(1, #symbols)]
         screen.write(random_symbol)
     end
 
     star_arr.index = star_arr.index + 1
     if star_arr.index > #star_arr.list then
         star_arr.index = 1
     end
 end
 
 test = init_star_tab(50)
 
 function meteor_management()
 	update_meteor( m1)
 	if meteor.pos.y > height+3 or
         meteor.pos.x > width+3 or
         meteor.pos.x < -3 then
         m1 = generate_meteor(math.random(1,3))
     end
 end
 
 while true do
     screen.clear()
     addStar(test)
     meteor_management()
     text_middle_screen("Salut les p'tits amis ! ")
     sleep(0.2)
 end