enderStaller

--[[Settings]]--
enderCeiver = "NQ3dvfFi"
enderSender = "Ud31mJ72"

--[[Variables & peripherals]]--
local width, height = term.getSize()
local list = {"Install enderSender", "Install enderCeiver", "Quit"}

--[[Functions]]--
local function round(number)
    return math.floor(number + 0.5)
end

local function spaces(number)
    for i = 1, number do
        write(" ")
    end
end

function menu(list, selector)
    local selector = selector or {"[", "]"}
    local longestItem = 0
    local width, height = term.getSize()
    for i, item in pairs(list) do
        if #item > longestItem then
            longestItem = #item
        end
    end
    local selected = 1
    local startX = round((width / 2) - (longestItem / 2)) - 2
    local startY = round((height / 2) - (#list / 2))
    for i, j in pairs(list) do
        if #j > longestItem then
            longestItem = #j
        end
    end
    local running = true
    while running do
        curX = startX
        curY = startY
        for i, item in pairs(list) do
            term.setCursorPos(curX, curY)
            if i == selected then
                write(selector[1].." "..item)
                spaces(longestItem - #item + 1)
                write(selector[2])
            else
                spaces(2)
                write(item)
                spaces(longestItem - #item + 2)
            end
            curY = curY + 1
        end
        event, key = os.pullEvent("key")
        if key == keys.up and selected > 1 then
            selected =  selected - 1
        elseif key == keys.down and selected < #list then
            selected =  selected + 1
        elseif key == keys.enter then
            return list[selected]
        elseif key == keys.q then
            return "quit"
        end
    end
end

local function modifyStartup(programName, redstoneSide, chestSide)
    if fs.exists("startup") then
        print("Backing up old startup file to /backupStartup...")
        fs.delete("backupStartup")
        fs.copy("startup", "backupStartup")
    end
    print('"Creating new startup file to run file "'..programName..'"')
    startup = fs.open("startup", "w")
    startup.writeLine("shell.run('"..programName.." "..redstoneSide.." "..chestSide.."')")
    startup.close()
end

function askSettings()
    print("Redstone side:")
    redstoneSide = read()
    print("Ender chest side:")
    chestSide = read()
    return redstoneSide, chestSide
end

--[[Main program]]--
shell.run("clear")
option = menu(list)
shell.run("clear")

if option == list[1] then
    if fs.exists("enderSender") then
        print("Deleting old enderSender file...")
        fs.delete("enderSender")
    end
    shell.run("pastebin get "..enderSender.." enderSender")
    modifyStartup("enderSender", askSettings())
elseif option == list[2] then
    if fs.exists("enderCeiver") then
        print("Deleting old enderCeiver file...")
        fs.delete("enderCeiver")
    end
    shell.run("pastebin get "..enderCeiver.." enderCeiver")
    modifyStartup("enderCeiver", askSettings())
end

os.reboot()