health.lua

local shell=require("shell")

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

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


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

local function setHealth(player, health)
  if player ~= nil and health ~= 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
      if health <= p1.getMaxHealth() and health >= 0 then
        p1.setHealth(health)
      else
        print("Invalid health (has to be between 0 and " .. p1.getMaxHealth() .. ")!")
      end
    else
      print("Player not found!")
    end
  else
    print("Player or health can't be nil!")
  end
end

local function getHealth(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.getHealth()
    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 = getHealth(args[1])
  if gm ~= nil then
    print(gm)
  end
elseif #args == 2 then
  setHealth(args[1], tonumber(args[2]))
else
  print("Usage:")
  print("health <username> [health]")
  return 1
end