Fix sh block execution in session

Hi,

When evaluating shell code blocks in org-babel, the execution seems to hang
indefinitely. The following patch is trying to fix this problem by modifying
the way shell code is send to comint and the way the end-of-evaluation
indicator is looking for.

As I am far from an emacs lisp expert and as the patch modifies the widely use
org-babel-comint-with-output function, it certainly needs some testing. I've
made some tests with shell and R code blocks, but I'm not sure it's enough.

Thanks !

Julien

Fix sh block execution in a session

* lisp/ob-sh.el (org-babel-sh-evaluate) : when sending input to comint, wait
until previous line execution is finished
* lisp/ob-comint.el (org-babel-comint-with-output) : when looking for
end-of-evaluation indicator, search forward for the indicator before searching
forward for the prompt

lisp/ob-comint.el

@@ -93,9 +93,9 @@ or user `keyboard-quit' during execution of body."
 			  (goto-char comint-last-input-end)
 			  (not (save-excursion
 				 (and (re-search-forward
-				       comint-prompt-regexp nil t)
+				       (regexp-quote ,eoe-indicator) nil t)
 				      (re-search-forward
-				       (regexp-quote ,eoe-indicator) nil t)))))
+				       comint-prompt-regexp nil t)))))
 		   (accept-process-output (get-buffer-process (current-buffer)))
 		   ;; thought the following this would allow async
 		   ;; background running, but I was wrong...

lisp/ob-sh.el

@@ -170,7 +170,13 @@ return the value of the last statement in BODY."
 	    (session org-babel-sh-eoe-output t body)
 	  (mapc
 	   (lambda (line)
-	     (insert line) (comint-send-input nil t) (sleep-for 0.25))
+	     (insert line)
+	     (comint-send-input nil t)
+	     (while (save-excursion
+		      (goto-char comint-last-input-end)
+		      (not (re-search-forward
+			    comint-prompt-regexp nil t)))
+	       (accept-process-output (get-buffer-process (current-buffer)))))
 	   (append
 	    (split-string (org-babel-trim body) "\n")
 	    (list org-babel-sh-eoe-indicator))))