rbbupdater

-- ccGUI-API Updater by DerKoch AKA RoyalBingBong
-- Original idea for updater by Henness's "Advanced Updater"

-- Config
local author = "RoyalBingBong"
local project = "ccGUI-API"
local branch = "master"
local files = {"guiElements", "helper", "screen", "config"}
local dir = "RBB/"

--~ ##### Original Henness code START #####
function getLink(file)
    return "https://raw.github.com/" .. author .. "/" .. project .. "/" .. branch .. "/" .. file
end

function download(fname, name)
    write("Downloading: " .. fname)
    local data = http.get(getLink(fname))
    if data then
        write("\t\tDone\n")
        local file = fs.open(name,"w")
        file.write(data.readAll())
        file.close()
        return true
    end
    return false
end
--~ ##### Original Henness code END #####

-- Checks if newfile is newer than oldfile
-- Opens each files reads the first line and does some string operations
-- to get the version number of each
function isNewer(oldfile, newfile)
    -- I don't want to kill your settings ;)
    if oldfile == dir.."config" then
        return false
    end
    fold = fs.open(oldfile, "r")
    fnew = fs.open(newfile, "r")
    if not fold then
        return true
    end
    foldversion = fold.readLine()
    fnewversion = fnew.readLine()
    fold.close()
    fnew.close()
    local splitpos = string.find (foldversion, "=") + 2
    foldversion = string.sub (foldversion, splitpos)
    local splitpos = string.find (fnewversion, "=") + 2
    fnewversion = string.sub (fnewversion, splitpos)
    return tonumber(foldversion) < tonumber(fnewversion)
end

-- Downloads all files
function downloadAll()
    for _, fname in pairs(files) do
        download(fname, dir .. fname .. "tmp")
    end
end

-- Deletes or renames files according to their version number
function checkAll()
    for _,fname in pairs(files) do
        if fs.exists(dir..fname) then
            if isNewer(dir..fname, dir..fname.."tmp") then
                print("Deleting old " .. fname)
                fs.delete(dir..fname)
                sleep(0.5)
                print("Renaming " .. fname.."tmp" .. " to " .. fname)
                fs.move(dir..fname.."tmp", dir..fname)
            else
                print(fname .. " is newest version")
                fs.delete(dir..fname.."tmp")
            end
        else
            print("Renaming " .. fname.."tmp" .. " to " .. fname)
            fs.move(dir..fname.."tmp", dir..fname)
        end
    end
end

-- Just creates the subdirectory for my API
function setup()
    if not fs.exists(dir) then
        fs.makeDir(dir)
    end
end

setup()
downloadAll()
checkAll()