gamemode.lua

local shell=require("shell")

local component = require("component")
local debug = component.debug

local args, options = shell.parse(...)


-------------- Functions --------------

local function setGamemode(player, gamemode)
  if player ~= nil and gamemode ~= nil then
    if gamemode == "survival" or gamemode == "creative" or gamemode == "adventure" or gamemode == "spectator" then
      local p1 = debug.getPlayer(player)
      local players = debug.getPlayers()
      local f1 = false, false

      for i, v in ipairs(players) do
        if v == player then f1 = true end
      end

      if f1 then
        p1.setGameType(gamemode)
      else
        print("Player not found!")
      end
    else
      print("Invalid gamemode!")
    end
  else
    print("Player or gamemode can't be nil!")
  end
end

local function getGamemode(player)
  if player ~= nil then
    local p1 = debug.getPlayer(player)
    local players = debug.getPlayers()
    local f1 = false, false

    for i, v in ipairs(players) do
      if v == player then f1 = true end
    end

    if f1 then
      return p1.getGameType()
    else
      print("Player not found!")
      return nil
    end
  else
    print("Player can't be nil!")
    return nil
  end
end

-------------- Main Code --------------

if #args == 1 then
  local gm = getGamemode(args[1])
  if gm ~= nil then
    print(gm)
  end
elseif #args == 2 then
  if args[2] == "0" then
    args[2] = "survival"
  elseif args[2] == "1" then
    args[2] = "creative"
  elseif args[2] == "2" then
    args[2] = "adventure"
  elseif args[2] == "3" then
    args[2] = "spectator"
  end
  setGamemode(args[1], args[2])
else
  print("Usage:")
  print("gamemode <username> [gamemode]")
  return 1
end