Sandbox.lua

function prn(s)
   DEFAULT_CHAT_FRAME:AddMessage(s)
end

SLASH_SANDBOX1 = '/sandbox'
SlashCmdList['SANDBOX'] = function() prn('Sandbox loaded! :)') end

SLASH_EVAL1 = '/eval'
SlashCmdList['EVAL'] = function(s)
   if s == nil or s == '' then
      prn('Need lua expression')
      return
   end
   local tmpl = [[
local res = %s
if res == nil then
  return 'nil'
else
  return tostring(res)
end
]]
   local fn = loadstring(string.format(tmpl, s))
   if fn == nil then
      prn('Bad lua expression "' .. s .. '"')
   else
      local res = fn()
      prn(res ~= nil and res or 'nil')
   end
end

function lsAddons()
   local n = GetNumAddOns()
   if n == 0 then
      prn("(No addons)")
      return
   end
   for idx = 1, n do
      prn(tostring(idx) .. ' "' .. GetAddOnInfo(idx) .. '" ' .. (IsAddOnLoaded(idx) and 'loaded' or '*not* loaded'))
   end
end

prn('Sandbox successfully executed.')