DeltaOS-unstable installer for fork

--[[ /gitget
GitHub downloading utility for CC.
Developed by apemanzilla.

If you want to use this as an automated installer, please see lines 13 and 23.

This requires ElvishJerricco's JSON parsing API.
Direct link: http://pastebin.com/raw.php?i=4nRg9CHU
]]--

local args = {...}


--Remove the line above this and change the lines below to use automated mode.
local automated = true                                                  -- Don't touch!
local hide_progress = true                                              -- If true, will not list out files as they are downloaded
args[1] = "FNCxPro"                                                 -- Github username
args[2] = "deltaOS-unstable"                                                               -- Github repo name
args[3] = nil                                                                   -- Branch - defaults to "master"
args[4] = nil                                                                   -- Path - defaults to root ("/")
local pre_dl = "print('Starting download...')"  -- Command(s) to run before download starts.
local post_dl = "os.reboot()"   -- Command(s) to run after download completes.
--Remove the line below this and change the lines below to use automated mode.

args[3] = args[3] or "master"
args[4] = args[4] or ""

if not automated and #args < 2 then
        print("Usage:\n"..shell.getRunningProgram().." <user> <repo> [branch=master] [path=/]") error()
end

local function save(data,file)
        local file = shell.resolve(file)
        if not (fs.exists(string.sub(file,1,#file - #fs.getName(file))) and fs.isDir(string.sub(file,1,#file - #fs.getName(file)))) then
                if fs.exists(string.sub(file,1,#file - #fs.getName(file))) then fs.delete(string.sub(file,1,#file - #fs.getName(file))) end
                fs.makeDir(string.sub(file,1,#file - #fs.getName(file)))
        end
        local f = fs.open(file,"w")
        f.write(data)
        f.close()
end

local function download(url, file)
        save(http.get(url).readAll(),file)
end

if not json then
        --print("Downloading JSON api...\n(Credits to ElvishJerricco!)")
        download("http://pastebin.com/raw.php?i=4nRg9CHU","json")
        os.loadAPI("json")
end

if pre_dl then loadstring(pre_dl)() else print("Downloading files from github....") end
local data = json.decode(http.get("https://api.github.com/repos/"..args[1].."/"..args[2].."/git/trees/"..args[3].."?recursive=1").readAll())
if data.message and data.message == "Not found" then error("Invalid repository",2) else
        for k,v in pairs(data.tree) do
                -- Make directories
                if v.type == "tree" then
                        fs.makeDir(fs.combine(args[4],v.path))
                        if not hide_progress then
                                print(v.path)
                        end
                end
        end
        for k,v in pairs(data.tree) do
                -- Download files
                if v.type == "blob" then
                        download("https://raw.github.com/"..args[1].."/"..args[2].."/"..args[3].."/"..v.path,fs.combine(args[4],v.path))
                        if not hide_progress then
                                print(v.path)
                        end
                end
        end
end
if post_dl then loadstring(post_dl)() end