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[O] Tentative patch to keep org-babel-results-keyword when calling org-b

From: Daniele Pizzolli
Subject: [O] Tentative patch to keep org-babel-results-keyword when calling org-babel-remove-result
Date: Fri, 20 Sep 2013 22:28:37 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130827 Icedove/17.0.8

Hello @ll,

this is my fist post on the list.  Thanks to everybody for posting
interesting things and keeping org-mode improving!

I am seeking help because of my limited elisp knowledge.

This is my incomplete patch to extend org-babel-remove-result to keep
the org-babel-results-keyword when removing the results.

I need to keep the org-babel-results-keyword because I want to commit
to my dvcs a clean file and easily evaluate the results at any time

Unfortunately running org-babel-remove-result on a snippet like the

#+BEGIN_SRC octave :results value file
% at the end produce an image

#+ATTR_LATEX: :width 3cm

Will output:

#+BEGIN_SRC octave :results value file
% at the end produce an image

#+ATTR_LATEX: :width 3cm

And a run of org-babel-execute-buffer will produce:

#+BEGIN_SRC octave :results value file
% at the end produce an image


#+ATTR_LATEX: :width 3cm

changing the position of the LaTeX specific attribute #+ATTR_LATEX: in
way that it becomes useless.

The patch add an optional argument to org-babel-remove-result but
relies to an hard-coded value of the length of the default
org-babel-results-keyword plus syntax elements: "#+RESULTS:".

Instead of calculating lengths I think that is better to move to next

I also skipped a deletion of the last char assuming that is always a
new line.  Is this assumption correct?  If we delete the last line
we can end with:

** some other section

That will cause problem in the next evaluation.

I will appreciate your suggestions to improve the patch myself.  It
would be great also if anybody can implement it properly and get it merged.

Thanks in advance,
Daniele Pizzolli

diff --git a/lisp/ob-core.el b/lisp/ob-core.el
index cc6b7a9..7517ebf 100644
--- a/lisp/ob-core.el
+++ b/lisp/ob-core.el
@@ -2159,15 +2159,18 @@ code ---- the results are extracted in the syntax of 
the source
          (set-marker visible-beg nil)
          (set-marker visible-end nil))))))

-(defun org-babel-remove-result (&optional info)
-  "Remove the result of the current source block."
+(defun org-babel-remove-result (&optional info keep-keyword)
+  "Remove the result of the current source block.  Optionally
+keep the result keyword."
   (let ((location (org-babel-where-is-src-block-result nil info)) start)
     (when location
-      (setq start (- location 1))
+      (setq start (if keep-keyword (+ location 10) (- location 1)))
         (goto-char location) (forward-line 1)
-        (delete-region start (org-babel-result-end))))))
+        (delete-region
+         start
+          (if keep-keyword (- (org-babel-result-end) 1) 

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