darklands installer

--  Installer for NitrogenFingers' RPG Darklands: Tales from Transylvania

local function centerPrint(text, y)
    if type(text) == "table" then for _, v in pairs(text) do centerPrint(v) end
    else
        local x, y = term.getCursorPos()
        local w, h = term.getSize()
        term.setCursorPos(w/2 - text:len()/2, ny or y)
        print(text)
    end
end

local function download(url, path)
    for i = 1, 3 do
        local response = http.get(url)
        if response then
            local data = response.readAll()
            response.close()
            if path then
                local f = io.open(path, "w")
                f:write(data)
                f:close()
            end
            return true
        end
    end

    return false
end

function extractRepository(cpfDir, destDir)
    --print("Constructing project...")
    local file = io.open(cpfDir, "r")
    local cFile = nil
    local lc = 0

    for line in file:lines() do
        if lc > 0 then
            cFile:write(line.."\n")
            lc = lc-1
            if lc == 0 then
                cFile:close()
                --print("File write complete.")
            end
        elseif string.find(line, "MKDIR") == 1 then
            local newDirPath = destDir.."/"..string.sub(line, 7)
            if fs.exists(newDirPath) then fs.delete(newDirPath) end
            fs.makeDir(newDirPath)
            --print("Created dir "..newDirPath)
        elseif string.find(line, "MKFIL") == 1 then
            local newFilPath = destDir.."/"..string.sub(line, 7)
            if fs.exists(newFilPath) then fs.delete(newFilPath) end
            cFile = io.open(newFilPath, "w")
            --print("Created file "..newFilPath)
        elseif string.find(line, "WRITE") == 1 then
            lc = tonumber(string.sub(line, 7))
        end
        sleep(0)
    end
    --print("Project constructed.")
end

term.setBackgroundColor(colors.white)
term.setTextColor(colors.gray)
term.clear()
term.setCursorPos(1, 5)

centerPrint("Installing Darklands: Tales from Transylvania")
print("")
centerPrint("By NitrogenFingers")
print("\n")
centerPrint("...")

download("http://pastebin.com/raw.php?i=GvhXmvbS", "/.temp_to_extract")
extractRepository("/.temp_to_extract", shell.resolve("/"))
fs.delete("/.temp_to_extract")
fs.move("/rpg/rpg", "/rpg/game")
for k, v in pairs(fs.list("/rpg")) do
    fs.delete("/" .. v)
    fs.move("/rpg/" .. v, "/" .. v)
end
fs.delete("/rpg")
fs.move("/game", "/rpg")

local _, y = term.getCursorPos()
term.setCursorPos(1, y - 1)
centerPrint("Done!")
sleep(2)

term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)
term.clear()
term.setCursorPos(1, 1)
print("You can run the game by running /rpg.")