updater-client

local gistID = 'f404711feaaa8328f7f7110f40c6136b'

local FILENAME = '/test.lua'

local cacheBreak = tostring(math.random(0, 99999))

local link = 'https://gist.githubusercontent.com/PatrickScharberg/' .. gistID .. '/raw/' .. cacheBreak


res, err = http.get(link)
if not res then error(err) end

local code = res.readAll()


if not(fs.exists(FILENAME))
then
    local newHarvest = fs.open(FILENAME, 'w')
    newHarvest.close()
end

local readFile = fs.open(FILENAME, 'r')
local oldCode = readFile.readAll()
readFile.close()

local file = fs.open(FILENAME, 'w')

if oldCode == code
then
    file.write(oldCode)
    print('NO CHANGES MADE - Same Code')
else
    file.write(code)
    print('WRITING UPDATE')
    byteDiff = string.len(code) - string.len(oldCode)

    if byteDiff >= 0
    then
        print(tostring(math.abs(byteDiff)) .. ' bytes added')
    else
        print(tostring(math.abs(byteDiff)) .. ' bytes removed')
    end
end

file.close()
res.close()

shell.run(FILENAME)