up

term.clear()
term.setCursorPos(1,1)
term.write("Would you like to download the code or the updater? \n  code or up")
local mode = term.read()

term.clear()
term.setCursorPos(1,1)
term.write("Which program would you like to use? \n  Farm \n  Quarry \n  Furnace \n")
local program = term.read()
term.clear()
term.setCursorPos(1,1)

if mode == "code" then
    local FILENAME = '/'..program..'.lua'
    local cacheBreak = tostring(math.random(0, 99999))

    if program == "farm" then
        res, err = http.get('https://gist.githubusercontent.com/posLop/88141bcd6989689d5eb12d33287bc287/raw/carrot.lua?breaker=' .. cacheBreak)

    elseif program == "quarry" then
        res, err = http.get('https://gist.githubusercontent.com/posLop/5902d8ff5154abeef01221faae3f061e/raw/quarry.lua?breaker=' .. cacheBreak)

    elseif program == "furnace" then
        res, err = http.get('https://gist.githubusercontent.com/posLop/79a81458ae396e5c3b464a01349df60f/raw/funnel.lua?breaker=' .. cacheBreak)

    else
        term.write("invalid name")
        return
    end

    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()

elseif mode == "up" then
    if program == "quarry" then
        shell.run("pastebin", "get", "RxebTRQQ", "quarryUp")

    elseif program == "farm" then
        shell.run("pastebin", "get", "vPjt5XQ8", "farmUp")

    elseif program == "furnace" then
        shell.run("pastebin", "get", "5s1uvhv4", "furnaceUp")
    else
        term.write("invalid name")
    end
else
    term.write("invalid name")
end