export async function performLaunch(
  ctx: Context,
  logger: RecordingLogger,
  cave: Cave,
  game: Game
) {
  ctx.emitProgress({ progress: -1, stage: "configure" });

  const { store } = ctx;
  const taskId = ctx.getTaskId();
  store.dispatch(
    actions.taskProgress({
      id: taskId,
      progress: -1,
      stage: "prepare",
    })
  );

  // TODO: have butler check morphing and queue a heal if needed
  const { appVersion } = store.getState().system;
  logger.info(`itch ${appVersion} launching '${game.title}' (#${game.id})`);

  const { preferences } = store.getState();
  const prereqsDir = paths.prereqsPath();

  // TODO: extract that to another module
  let prereqsModal: TypedModal<any, any>;
  let prereqsStateParams: PrereqsStateParams;

  function closePrereqsModal() {
    if (!prereqsModal) {
      return;
    }

    store.dispatch(
      actions.closeModal({
        wind: "root",
        id: prereqsModal.id,
      })
    );
    prereqsModal = null;
  }

  let powerSaveBlockerId: number = null;

  let cancelled = false;
  let launchConvo: Conversation;
  await ctx.withStopper({
    work: async () => {
      try {
        await mcall(
          messages.Launch,
          {
            caveId: cave.id,
            prereqsDir,
            sandbox: preferences.isolateApps,
          },
          convo => {
            launchConvo = convo;
            hookLogging(convo, logger);

            convo.on(messages.PickManifestAction, async ({ actions }) => {
              const index = await pickManifestAction(store, actions, game);
              return { index };
            });

            convo.on(messages.AcceptLicense, async ({ text }) => {
              const res = await promisedModal(
                store,
                modals.naked.make({
                  wind: "root",
                  title: ["prompt.sla.title"],
                  message: ["prompt.sla.message"],
                  detail: text,
                  widgetParams: {} as any,
                  buttons: [
                    {
                      label: ["prompt.sla.accept"],
                      action: actions.modalResponse({}),
                    },
                    "cancel",
                  ],
                })
              );

              if (res) {
                return { accept: true };
              }
              return { accept: false };
            });

            convo.on(messages.HTMLLaunch, async params => {
              return await performHTMLLaunch({
                ctx,
                logger,
                game,
                params,
              });
            });

//.........这里部分代码省略.........

 stop: async () => {
   logger.debug(`Asked to stop, cancelling butler process`);
   cancelled = true;
   if (launchConvo) {
     await launchConvo.cancel();
   }
 },