--[[
  Function to loop in batches.
  Just a bit of warning, some commands as ZREM
  could receive a maximum of 7000 parameters per call.
]]

local function batches(n, batchSize)
  local i = 0

  return function()
    local from = i * batchSize + 1
    i = i + 1
    if (from <= n) then
      local to = math.min(from + batchSize - 1, n)
      return from, to
    end
  end
end