Need help about emacs-async

[fornwall]

From @tumashu on November 22, 2017 8:12

Hello

I have faced a problem that "emacs-async package can not work well in termux's emacs.", https://github.com/jwiegley/emacs-async/issues/90#issuecomment-346260368 , and I can not verify this is a emacs-async's bug or termux-emacs's bug, so I wish the friends who have installed the emacs in termux to test the below code, and feed back its work status, thanks:

(require 'async)
(async-start
   ;; What to do in the child process
   (lambda ()
     (message "This is a test")
     (sleep-for 3)
     222)

   ;; What to do when it finishes
   (lambda (result)
     (message "Async process done, result should be 222: %s" result)))

Copied from original issue: termux/termux-app#488

[fornwall]

@tumashu Is this something you still need help with or is it solved?

[tumashu]

It is not solve at the moment, I have debug two days, but can not find the reason.

[SDRausty]

Is it possible to remove some of the startup scripts emacs uses when starting default startup in Termux? Emacs is a tremendous tool, and it appears that emacs takes excessively long to startup. This inhibits its' use. Compare with vim on device, which is tremendous too.

[Grimler91]

@tumashu could you provide some more info on how to reproduce the error (what is the actual error?).

I guess the emacs-async needs to be downloaded/cloned from github.com/jwiegley/emacs-async? Are you running the code with eval-buffer or in some other way?

[Grimler91]

@sdrausty that's a bit off-topic here. Might be better to ask in irc, or G+.

[tumashu]

@Grimler91 Please see: https://github.com/jwiegley/emacs-async/issues/90

1. Run emacs
2. install emacs-async with: "package-install emacs-async"
3. Run emacs with: "emacs -q"
4. (package-initialize)
5. (require 'emacs-async)
6. do test

[stale[bot]]

This issue/PR has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Cletip]

Same issue here, maybe not the same problem. Strange error for me, I have this message :

error in process sentinel: async-handle-result: End of file during parsing

The error is always after a certain time : for me the subprocess isn't even started (I think).

[jaeyeom]

Until termux properly handles emacs-async, I just disabled asyncronous API. In my case, I'm using spacemacs and it checks the git hash asynchronously, which I don't think it's that critical. (git is fast for me.) So I put the following code under dotspacemacs/user-init function.

  (defun my/termux-p ()
    (not (null (getenv "TERMUX_VERSION"))))

  (defvar my/termux-p (my/termux-p))

  ;; Bug patch for Termux. `async-start' does not work properly in Termux. Let's
  ;; make the function synchronous.
  (if my/termux-p
      (with-eval-after-load 'async
        (defun async-start (start-func &optional finish-func)
          "Different from the original function, this function is synchronous."
          (let ((result (funcall start-func)))
            (when finish-func
              (funcall finish-func result))
            result))))

Seems like it's working for me. I can see a proper value in spacemacs-revision--last.