Minecraft RPG

map = {"x","x","x","x","x","x","x","x","x",
       "x","-","-","x","-","-","x","-","x",
       "x","x","-","x","x","-","x","-","x",
       "x","-","-","-","-","-","x","-","x",
       "x","-","-","-","-","-","-","-","x",
       "x","-","x","-","x","-","x","-","x",
       "x","-","-","x","-","-","-","-","x",
       "x","-","-","x","x","x","-","-","x",
       "x","x","x","x","x","x","x","x","x"}
charx = 2
chary = 2
charpos = 11
turn = 0
npcon = false
start = true
credits = {"Developer: Urumasi", "Map: Urumasi", "Textures: Urumasi"}
function drawNPC(nx,ny,npos,nchar,nmode)
  npcon = true
  npcx = nx
  npcy = ny
  npcchar = nchar
  npcmode = nmode
  npcpos = npos
  drawMap()
end
function updateNPC()
  if npcmode == "dumb" then
    turn = math.random(1,4)
    if (turn == 1) and (map[npcpos-9] == "-") then
      npcpos = npcpos-9
      npcy = npcy-1
    elseif (turn == 2) and (map[npcpos+9] == "-") then
      npcpos = npcpos+9
      npcy = npcy+1
    elseif (turn == 3) and (map[npcpos-1] == "-") then
      npcpos = npcpos-1
      npcy = npcx-1
    elseif (turn == 4) and (map[npcpos+1] == "-") then
      npcpos = npcpos+1
      npcy = npcx+1
    end
  end
end
function drawMap()
  shell.run("clear")
  print("+--+--+-+")
  print("|  |  | |")
  print("+- +- | |")
  print("|     ' |")
  print("|       |")
  print("| O O O |")
  print("|  ,    |")
  print("|  +--  |")
  print("+-------+")
  if npcon then
    term.setCursorPos(npcx,npcy)
    write(npcchar)
  end
  term.setCursorPos(charx,chary)
  print("&")
end
function move(side)
  if (side == "w") and (map[charpos-9] == "-") then
    charpos = charpos-9
    chary = chary-1
  elseif (side == "s") and (map[charpos+9] == "-") then
    charpos = charpos+9
    chary = chary+1
  elseif (side == "a") and (map[charpos-1] == "-") then
    charpos = charpos-1
    charx = charx-1
  elseif (side == "d") and (map[charpos+1] == "-") then
    charpos = charpos+1
    charx = charx+1
  end
  drawMap()
end
function drawCredits()
  shell.run("clear")
  print("\n\n\n"..credits[1])
  sleep(1)
  shell.run("clear")
  print("\n\n"..credits[1])
  print(credits[2])
  sleep(1)
  shell.run("clear")
  print("\n"..credits[1])
  print(credits[2])
  print(credits[3])
  sleep(1)
  shell.run("clear")
  print(credits[1])
  print(credits[2])
  print(credits[3])
  sleep(1)
  shell.run("clear")
  print(credits[2])
  print(credits[3])
  sleep(1)
  shell.run("clear")
  print(credits[3])
  sleep(1)
  shell.run("clear")
  sleep(1)
  drawMap()
end
function drawMenu()
  shell.run("clear")
  print("Back")
  print("Exit game")
  mc = true
  while mc do
    local event, param1, param2, param3 = os.pullEvent("mouse_click")
    if param1 == 1 then
      if (param2 > 0) and (param2 < 5) and (param3 == 1) then
        mc = false
        drawMap()
      end
      if (param2 > 0) and (param2 < 10) and (param3 == 2) then
        mc = false
        start = false
        shell.run("clear")
      end
    end
  end
end

drawMap()
while start do
  local event, param1 = os.pullEvent("char")
  if (param1 == "w") or (param1 == "a") or (param1 == "s") or (param1 == "d") then
    move(param1)
  end
  if param1 == "c" then
    drawCredits()
  end
  if param1 == "l" then
    shell.run("clear")
    print("+++ +++ ++++")
    print("+ + + + +")
    print("++  +++ + ++")
    print("+ + +   +  +")
    print("+ + +   ++++")
    print("\nVersion: 0.1")
    print("\n156 lines of code!")
    print("\nChangelog:")
    print("Initial release!")
    print("\nWIP: NPCs")
    print("\n\nPress any key to return.")
    event, param1 = os.pullEvent("char")
    drawMap()
  end
  if param1 == "m" then
    drawMenu()
  end
end