Lightspeed Alpha installer

local width, height = term.getSize()

local totalDownloaded = 0

local function update(text)
    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.white)
    term.setCursorPos(1, 9)
    term.clearLine()
    term.setCursorPos(math.floor(width/2 - string.len(text)/2 + 0.5), 9)
    write(text)
end

local function bar(ratio)
    term.setBackgroundColor(colors.gray)
    term.setTextColor(colors.lime)
    term.setCursorPos(1, 11)

    for i = 1, width do
        if (i/width < ratio) then
            write("]")
        else
            write(" ")
        end
    end
end

local function download(path, attempt)
    local rawData = http.get("https://raw.githubusercontent.com/Xella37/LightspeedAlpha/master/"..path)
    update("Downloaded " .. path .. "!")
    if not rawData then
        if attempt == 3 then
            error("Failed to download " .. path .. " after 3 attempts!")
        end
        update("Failed to download " .. path .. ". Trying again (attempt " .. (attempt+1) .. "/3)")
        return download(path, attempt+1)
    end
    local data = rawData.readAll()
    local file = fs.open(path, "w")
    file.write(data)
    file.close()
end

local function downloadAll(downloads, total)
    local nextFile = table.remove(downloads, 1)
    if nextFile then
        sleep(0.1)
        parallel.waitForAll(function()
            downloadAll(downloads, total)
        end, function()
            download(nextFile, 1)
            totalDownloaded = totalDownloaded + 1
            bar(totalDownloaded / total)
        end)
    end
end

function install()
    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.yellow)
    term.clear()

    local str = "Lightspeed Alpha Installer"
    term.setCursorPos(math.floor(width/2 - #str / 2 + 0.5), 2)
    write(str)

    update("Installing...")
    bar(0)

    local total = 36

    local folders = {
    }

    local downloads = {
        "Lightspeed",
        "README.md",
        "eShip1.img",
        "eShip1_broken.img",
        "eShip2.img",
        "eShip2_broken.img",
        "eShip3.img",
        "eShip3_broken.img",
        "eShip4.img",
        "eShip4_broken.img",
        "eShip5.img",
        "eShip5_broken.img",
        "eShip6.img",
        "eShip6_broken.img",
        "eShip7.img",
        "eShip7_broken.img",
        "eShip8.img",
        "eShip8_broken.img",
        "eShip9.img",
        "eShip9_broken.img",
        "eShip10.img",
        "eShip10_broken.img",
        "eShip11.img",
        "eShip11_broken.img",
        "eShip12.img",
        "eShip12_broken.img",
        "pShip1.img",
        "pShip2.img",
        "ui",
    }

    local total = #folders + #downloads

    for i = 1, #folders do
        local folder = folders[i]
        update("Creating " .. folder .. " folder...")
        fs.makeDir(folder)
        bar(i/total)
    end

    totalDownloaded = #folders
    downloadAll(downloads, total)

    update("Installation finished!")

    sleep(1)

    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.white)
    term.clear()

    term.setCursorPos(1, 1)
    write("Finished installation!\nPress any key to close...")

    os.pullEventRaw()

    term.clear()
    term.setCursorPos(1, 1)
end

install()