[O] [PATCH 01/10] Fix org-babel-R-initiate-session

[Aaron Ecay]

* lisp/ob-R.el (org-babel-R-initiate-session): handle case where the
  session buffer exists, but does not have a live process

If the session buffer exists, but the user has exited the R process
manually, then the (R) command will create a new buffer, then try to
rename it over the old buffer, causing an error.  The right thing to do
is to start R within the existing buffer.
---
 lisp/ob-R.el | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/lisp/ob-R.el b/lisp/ob-R.el
index 9875f81..de9ec5b 100644
--- a/lisp/ob-R.el
+++ b/lisp/ob-R.el
@@ -209,14 +209,18 @@ This function is called by `org-babel-execute-src-block'."
       (if (org-babel-comint-buffer-livep session)
          session
        (save-window-excursion
-         (require 'ess) (R)
-         (rename-buffer
-          (if (bufferp session)
-              (buffer-name session)
-            (if (stringp session)
-                session
-              (buffer-name))))
-         (current-buffer))))))
+         (save-excursion
+           (when (get-buffer session)
+             ;; Session buffer exists, but with dead process
+             (set-buffer session))
+           (require 'ess) (R)
+           (rename-buffer
+            (if (bufferp session)
+                (buffer-name session)
+              (if (stringp session)
+                  session
+                (buffer-name))))
+           (current-buffer)))))))
 
 (defun org-babel-R-associate-session (session)
   "Associate R code buffer with an R session.
-- 
1.8.2