updateConnections.lua

devices = {}
deviceFileName = "redstone.devices"

local deviceFile = io.open(deviceFileName, "r")
for line in deviceFile:lines() do
  local device = {}
  for value in line:gmatch("%S+") do
    table.insert(device, value)
  end

  devices[device[1]] = device[2]
end
deviceFile:close()
deviceFile = nil

local accessedAddresses = {}

for address, type in pairs(require("component").list()) do
  if type == "redstone" then
    table.insert(accessedAddresses, address)
    if devices[address] == nil then
      io.write(address, " is not registered.\n")
      io.write("What should its alias be?\n")
      name = io.read()
      devices[address] = name
    end
  end
end

for address, name in pairs(devices) do
  local valueExists = false
  for index, visited in pairs(accessedAddresses) do
    if visited == address then
      valueExists = true
    end
  end

  if valueExists == false then
    devices[address] = nil
  end
end

local deviceFile = io.open(deviceFileName, "w")
for address, name in pairs(devices) do
  deviceFile:write(address, " ", name, "\n")
end
deviceFile:close()