NoteBlockCheckUpdate

local repoOwner = "DaikiKaminari"
local repoName = "NoteBlock"
local workingTree = "master"
local downloadDir = "downloads/" .. repoName
local repoLink = "https://github.com/" .. repoOwner .."/" .. repoName .. "/blob/dev"
local versionFileName = "version.json"

if not fs.exists("github") then
    error("[github] does not exist.")
end

if not fs.exists("lib/objectJSON") or not fs.exists("lib/json") then
    error("objectJSON or json does not exist.")
end
os.loadAPI("lib/objectJSON")
objectJSON.init()

local function split(inputstr, sep)
    if sep == nil then sep = "%s" end
    local t={}
    for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
            table.insert(t, str)
    end
    return t
end

local function rename(path)
    for _,f in pairs(fs.list(path)) do
        if fs.isDir(f) then
            rename(path .. "/" .. f)
        else
            local prog = split(f, ".")[1]
            local ext = split(f, ".")[2]
            if ext ~= nil then
                shell.run("mv " .. path .. "/" .. f .. " " .. path .. "/" .. prog)
            end
        end
    end
end

local function delete(where_to_delete, what_to_delete)
    for _,f in pairs(fs.list(what_to_delete)) do
        if fs.isDir(f) then
            delete(where_to_delete .. "/" .. f, what_to_delete .. "/" .. f)
        else
            shell.run("rm " .. where_to_delete .. "/" .. f)
        end
    end
end

local function copy(what_to_copy, where_to_copy)
    for _,f in pairs(fs.list(what_to_copy)) do
        if fs.isDir(f) then
            copy(what_to_copy .. "/" .. f, where_to_copy .. "/" .. f)
        else
            if fs.exists(where_to_copy .. "/" .. f) then
                print("[" ..where_to_copy .. "/" .. f .. "] already exist.")
            else
                shell.run("cp "  .. what_to_copy .. "/" .. f .. " ".. where_to_copy .. "/" .. f)
            end
        end
    end
end

local version = fs.exists("version") and objectJSON.decodeFromFile("version").version or -1
--local version = objectJSON.decodeFromFile("version").version
print("Actual version : " .. tostring(version))
local newVersion
while true do
    newVersion = objectJSON.decodeHTTP("https://raw.githubusercontent.com/" .. repoOwner .. "/"  .. repoName .. "/"
    .. workingTree .."/" .. versionFileName).version
    -- wait for a new version
    if not fs.exists("version") or newVersion ~= nil and version ~= newVersion then
        print("New version : " .. tostring(newVersion))
        -- delete old filed and then old download files
        if fs.exists(downloadDir) then
            delete(".", downloadDir)
            shell.run("rm " .. downloadDir)
        end
        sleep(1)
        shell.run("github " .. repoOwner .. " " .. repoName)
        -- remove extensions
        rename(downloadDir)
        copy(downloadDir, ".")
        return
    end
    sleep(1)
end