babel question: how to detect the REPL has finished replying

[Alan Schmitt <alan.schmitt@polytechnique.org>]

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Hello,

I’m tweaking ob-coq and I’m trying to make it more robust. I have
a question about the way the code detects that the toplevel has finished
replying. Here is the current code (the function name has changed, but
the code is the same):

#+begin_src emacs-lisp
(defun org-babel-coq-run-one-phrase (phrase session)
  (let ((pt (lambda ()
	      (marker-position
	       (process-mark (get-buffer-process (current-buffer)))))))
    (org-babel-coq-clean-prompt
     (org-babel-comint-in-buffer session
       (let ((start (funcall pt)))
	 (with-temp-buffer
	   (insert phrase)
	   (comint-send-region (coq-proc) (point-min) (point-max))
	   (comint-send-string (coq-proc)
	    (if (string= (buffer-substring (- (point-max) 1) (point-max)) ".")
		"\n"
	      ".\n")))
	 (while (equal start (funcall pt)) (sleep-for 0.1))
	 (buffer-substring start (funcall pt)))))))
#+end_src

If I read this correctly, this code waits until the REPL has sent
something, and then it returns it. Unfortunately, Coq’s replies may be
on several lines, and I have seen some of the output not being captured
sometimes.

I’m wondering if it is possible to make this more robust, for instance
by detecting the prompt.

Here is an example of an interaction with the toplevel (the square
denotes the position of the cursor after the interaction):
#+begin_example
Coq < Check S.
S
     : nat -> nat

Coq < ■
#+end example

Could one try to match "Coq < $" on the buffer-substring, and only
return when it matches?

Thanks,

Alan

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