Re: Clone tree backwards in time

[Yasushi SHOJI <yasushi.shoji@gmail.com>]

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Hi,

On Thu, Jan 10, 2019 at 1:28 PM Scott Randby <srandby@gmail.com> wrote:
> On occasion, I need to clone a tree backwards in time. I tried using something like -2d (instead of the usual +2d) without success. Is there a way to clone backwards in time?

How about this?
-- 
            yashi

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From 5d421e09f80dde295bbd4541059f5d432dce2c59 Mon Sep 17 00:00:00 2001
From: Yasushi SHOJI <yasushi.shoji@gmail.com>
Date: Mon, 14 Jan 2019 10:19:50 +0900
Subject: [PATCH] clone: Allow time shift in backward

Make org-clone-subtree-with-time-shift accept a negative value to
shift the timestamp in backward.
---
 lisp/org.el              |  2 +-
 testing/lisp/test-org.el | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lisp/org.el b/lisp/org.el
index 0b090ee39..19b1946a0 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -8451,7 +8451,7 @@ with the original repeater."
 		"")))			;No time shift
 	 (doshift
 	  (and (org-string-nw-p shift)
-	       (or (string-match "\\`[ \t]*\\+?\\([0-9]+\\)\\([dwmy]\\)[ \t]*\\'"
+	       (or (string-match "\\`[ \t]*\\([\\+\\-]?[0-9]+\\)\\([dwmy]\\)[ \t]*\\'"
 				 shift)
 		   (user-error "Invalid shift specification %s" shift)))))
     (goto-char end-of-tree)
diff --git a/testing/lisp/test-org.el b/testing/lisp/test-org.el
index 976b7d8d6..db34a03c2 100644
--- a/testing/lisp/test-org.el
+++ b/testing/lisp/test-org.el
@@ -1496,6 +1496,18 @@
 	    (replace-regexp-in-string
 	     "\\( [.A-Za-z]+\\)\\( \\+[0-9][hdmwy]\\)?>" "" (buffer-string)
 	     nil nil 1))))
+  ;; Clone repeating once in backward.
+  (should
+   (equal "\
+* H1\n<2015-06-21>
+* H1\n<2015-06-19>
+* H1\n<2015-06-17 +1w>
+"
+	  (org-test-with-temp-text "* H1\n<2015-06-21 Sun +1w>"
+	    (org-clone-subtree-with-time-shift 1 "-2d")
+	    (replace-regexp-in-string
+	     "\\( [.A-Za-z]+\\)\\( \\+[0-9][hdmwy]\\)?>" "" (buffer-string)
+	     nil nil 1))))
   ;; Clone non-repeating zero times.
   (should
    (equal "\
-- 
2.20.1