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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How to execute code after start-process completion?
Date: Sat, 26 Sep 2020 17:21:30 +0300
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To: Pankaj Jangid <pankaj@codeisgreat.org>
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In-Reply-To: <m2k0wg63jq.fsf@codeisgreat.org> (message from Pankaj Jangid on
 Sat, 26 Sep 2020 19:30:41 +0530)
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> From: Pankaj Jangid <pankaj@codeisgreat.org>
> Date: Sat, 26 Sep 2020 19:30:41 +0530
> 
> #+BEGIN_SRC emacs-lisp
> (add-hook 'gnus-after-getting-new-news-hook
> 	  (lambda ()
> 	    (start-process "notmuch" "*Notmuch*" "notmuch" "new")
> 	    ;; (print (current-time-string) (get-buffer "*Notmuch*"))
> 	    ))
> #+END_SRC
> 
> After completion of the process (`notmuch new`), I want to execute some
> code. As you can see above, I want to put the timestamp in the *Notmuch*
> buffer. I know that `start-process` returns the process object. But I
> couldn't find how to use it. Please share any pointers/code-snippet on
> how to use that object accomplish what I want to do? Or may be there is
> a different way to do the task. Please advise.

The usual way of doing that is to set up a process-sentinel function.
It will be called when the process finishes.