[PATCH 2/3] Provide customization variable `org-clone-delete-id'.

[David Maus <dmaus@ictsoc.de>]

When non-nil, clones of a subtree don't inherit the ID property.
Otherwise they do and it will be set to a new unique identifier.
---
 lisp/ChangeLog |    3 +++
 lisp/org.el    |   16 ++++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index ec2fa36..ba65761 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -4,6 +4,9 @@
 	when cache was cleared.
 	(org-clone-subtree-with-time-shift): Maybe create ID property
 	in cloned subtrees.
+	(org-clone-delete-id): New customization variable.
+	(org-clone-subtree-with-time-shift): Use customization
+	variable `org-clone-delete-id'.
 
 2010-05-17  Carsten Dominik  <carsten.dominik@gmail.com>
 
diff --git a/lisp/org.el b/lisp/org.el
index 64da60a..88d636d 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -105,6 +105,13 @@
 (require 'org-footnote)
 
 ;;;; Customization variables
+(defcustom org-clone-delete-id nil
+  "Remove ID property of clones of a subtree.
+When non-nil, clones of a subtree don't inherit the ID property.
+Otherwise they inherit the ID property with a new unique
+identifier."
+  :type 'boolean
+  :group 'org-id)
 
 ;;; Version
 
@@ -7204,13 +7211,18 @@ and still retain the repeater to cover future instances of the task."
 			   (with-temp-buffer
 			     (insert template)
 			     (org-mode)
-			     (org-id-get-create t)
+			     (goto-char (point-min))
+			     (if org-clone-delete-id
+				 (org-entry-delete nil "ID")
+			       (org-id-get-create t))
 			     (buffer-string))))
 	    (with-temp-buffer
 	      (insert template)
 	      (org-mode)
 	      (goto-char (point-min))
-	      (if idprop (org-id-get-create t))
+	      (and idprop (if org-clone-delete-id
+			      (org-entry-delete nil "ID")
+			    (org-id-get-create t)))
 	      (while (re-search-forward org-ts-regexp-both nil t)
 		(org-timestamp-change (* n shift-n) shift-what))
 	      (unless (= n n-no-remove)
-- 
1.7.1