export function deployCoreAsync()

in editor/deploy.ts [258:338]
66 lines of code
10 McCabe index (conditional complexity)

export function deployCoreAsync(resp: pxtc.CompileResult) {
    let filename = resp.downloadFileBaseName || "pxt"
    filename = filename.replace(/^lego-/, "")

    let elfPath = fspath + filename + ".elf"
    let rbfPath = fspath + filename + ".rbf"

    let rbfHex = rbfTemplate
        .replace(/\s+/g, "")
        .replace("XX", pxt.U.toHex(pxt.U.stringToUint8Array(elfPath)))
    let rbfBIN = pxt.U.fromHex(rbfHex)
    pxt.HF2.write16(rbfBIN, 4, rbfBIN.length)

    let origElfUF2 = UF2.parseFile(pxt.U.stringToUint8Array(ts.pxtc.decodeBase64(resp.outfiles[pxt.outputName()])))

    let mkFile = (ext: string, data: Uint8Array = null) => {
        let f = UF2.newBlockFile()
        f.filename = "Projects/" + filename + ext
        if (data)
            UF2.writeBytes(f, 0, data)
        return f
    }

    let elfUF2 = mkFile(".elf")
    for (let b of origElfUF2) {
        UF2.writeBytes(elfUF2, b.targetAddr, b.data)
    }

    let r = UF2.concatFiles([elfUF2, mkFile(".rbf", rbfBIN)])
    let data = UF2.serializeFile(r)

    resp.outfiles[pxtc.BINARY_UF2] = btoa(data)

    let saveUF2Async = () => {
        if (pxt.commands && pxt.commands.electronDeployAsync) {
            return pxt.commands.electronDeployAsync(resp);
        }
        if (pxt.commands && pxt.commands.saveOnlyAsync) {
            return pxt.commands.saveOnlyAsync(resp);
        }
        return Promise.resolve();
    }

    if (!useHID) return saveUF2Async()

    pxt.tickEvent("webserial.flash");
    let w: Ev3Wrapper;
    return initHidAsync()
        .then(w_ => {
            w = w_
            if (w.isStreaming)
                pxt.U.userError("please stop the program first")
            return w.reconnectAsync(false)
                .catch(e => {
                    // user easily forgets to stop robot
                    bluetoothTryAgainAsync().then(() => w.disconnectAsync())
                        .then(() => pxt.U.delay(1000))
                        .then(() => w.reconnectAsync());

                    // nothing we can do
                    return Promise.reject(e);
                })
        })
        .then(() => w.stopAsync())
        .then(() => w.rmAsync(elfPath))
        .then(() => w.flashAsync(elfPath, UF2.readBytes(origElfUF2, 0, origElfUF2.length * 256)))
        .then(() => w.flashAsync(rbfPath, rbfBIN))
        .then(() => w.runAsync(rbfPath))
        .then(() => pxt.U.delay(500))
        .then(() => {
            pxt.tickEvent("webserial.success");
            return w.disconnectAsync()
            //return Promise.delay(1000).then(() => w.dmesgAsync())
        }).catch(e => {
            pxt.tickEvent("webserial.fail");
            useHID = false;
            useWebSerial = false;
            // if we failed to initalize, tell the user to retry
            return Promise.reject(e)
        })
}