Ext2CC Installer

--Modified Gitget
--Changes: Added installutils
--Stopped it from downloading JSON, loads the API off pastebin instead.

--[[
This is Install Utils by Geforce Fan. It's found @ BvL9rr0N , please get it from there to be sure it's up to date.
Just paste it into your installer!
]]
function pasteRun(id,aa)
  aa=aa or {}
  if not type(id)=="string" then
    return "Must has string!"
  end
  --get program off pastebin
  local a=http.get("http://www.pastebin.com/raw.php?i="..id)
  if not a then return false end
  a=a.readAll()
  if not a then return false end
  local env = {}
  a=loadstring(a)
  if not a then return false end
  --local env= setmetatable({},{__index=_G})
  local env = getfenv()
  setfenv(a,env)

  local ok,err=pcall(a,unpack(aa))
  --a()
  if (not ok) and err then
    printError("Error running "..id..": "..err)
    return false
  end
  return err,env
end
function pastePI(id,tab)
  local returned,env = pasteRun(id)
  _G[tab] = env
end

shell.run"delete start"
shell.run"delete bootstrap"


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

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

-- Edit these variables to use preset mode.
-- Whether to download the files asynchronously (huge speed benefits, will also retry failed files)
-- If false will download the files one by one and use the old output (List each file name as it's downloaded) instead of the progress bar
local async = true

-- Whether to write to the terminal as files are downloaded
-- Note that unless checked for this will not affect pre-set start/done code below
local silent = false

local preset = {
    -- The GitHub account name
    user = "AI221",
    -- The GitHub repository name
    repo = "ext2cc",

    -- The branch or commit tree to download (defaults to 'master')
    branch = nil,

    -- The local folder to save all the files to (defaults to '/')
    path = nil,

    -- Function to run before starting the download
    start = function()
        if not silent then print("Downloading files from GitHub...") end
    end,

    -- Function to run when the download completes
    done = function()
        if not silent then print("Done") end
        fs.copy("rootFS_temp", "rootFS")
        --fs.delete("json")
        print("Installed! Run 'start' to start the FS replacement. Edit 'start' and add the location of disks to the table at the top to add space to the filesystem.")
    end
}

-- Leave the rest of the program alone.
local args = {...}

args[1] = preset.user or args[1]
args[2] = preset.repo or args[2]
args[3] = preset.branch or args[3] or "master"
args[4] = preset.path or args[4] or ""

if #args < 2 then
        print("Usage:\n"..((shell and shell.getRunningProgram()) or "gitget").." <user> <repo> [branch/tree] [path]") error()
end

local function save(data,file)
    local file = shell.resolve(file:gsub("%%20"," "))
    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
    --download("http://pastebin.com/raw.php?i=4nRg9CHU","json")
    --os.loadAPI("json")
    pastePI("4nRg9CHU","json")
end

preset.start()
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:find("API rate limit exceeded") then error("Out of API calls, try again later") end
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
            end
        end
    end
    local drawProgress
    if async and not silent then
        local _, y = term.getCursorPos()
        local wide, _ = term.getSize()
        term.setCursorPos(1, y)
        term.write("[")
        term.setCursorPos(wide - 6, y)
        term.write("]")
        drawProgress = function(done, max)
            local value = done / max
            term.setCursorPos(2,y)
            term.write(("="):rep(math.floor(value * (wide - 8))))
            local percent = math.floor(value * 100) .. "%"
            term.setCursorPos(wide - percent:len(),y)
            term.write(percent)
        end
    end
    local filecount = 0
    local downloaded = 0
    local paths = {}
    local failed = {}
    for k,v in pairs(data.tree) do
        -- Send all HTTP requests (async)
        if v.type == "blob" then
            v.path = v.path:gsub("%s","%%20")
            local url = "https://raw.github.com/"..args[1].."/"..args[2].."/"..args[3].."/"..v.path,fs.combine(args[4],v.path)
            if async then
                http.request(url)
                paths[url] = fs.combine(args[4],v.path)
                filecount = filecount + 1
            else
                download(url, fs.combine(args[4], v.path))
                if not silent then print(fs.combine(args[4], v.path)) end
            end
        end
    end
    while downloaded < filecount do
        local e, a, b = os.pullEvent()
        if e == "http_success" then
            save(b.readAll(),paths[a])
            downloaded = downloaded + 1
            if not silent then drawProgress(downloaded,filecount) end
        elseif e == "http_failure" then
            -- Retry in 3 seconds
            failed[os.startTimer(3)] = a
        elseif e == "timer" and failed[a] then
            http.request(failed[a])
        end
    end
end
preset.done()