[BUG] Delay cookies of the form "--1d" are not handled properly [9.6.15 (release_9.6.15 @ /opt/homebrew/Cellar/emacs-plus@29/29.4/share/emacs/29.4/lisp/org/)]

["Alejandro Pérez Carballo" <apc@umass.edu>]

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With point on an entry containing a scheduled timestamp like “<2025-01-22 Wed +1d --1d>”, calling `(org-entry-put nil "SCHEDULED" (org-entry-get nil "SCHEDULED"))' results in the removal of the delay cookie "--1d". This doesn’t happen if there is no repeater or if the delay cookie is of the form "-1d". 

I’m assuming this is not the intended behavior. (As long as the current VAL of PROP is not problematic in some sense, I’d expect “(org-entry-put nil PROP (org-entry-get nil PROP))” to leave VAL intact.)

As far as I can tell, the issue can be traced back to the way `org--deadline-or-schedule' parses the ‘time’ argument: the variable ‘repeater’ is set to “+1d -1d” if the TIME argument to `org--deadline-or-schedule' is “+1d -1d” but set to “+1d” if it is “+1d --1d”.

I’m guessing the wrinkle is in the regex here:

“(string-match "\\([.+-]+[0-9]+[hdwmy]\\(?:[/ ][-+]?[0-9]+[hdwmy]\\)?\\)" time)”

but I’m not sure how to modify it. (The first captured group is “+1d -1d” when the input string is e.g. “<2025-01-22 Wed +1d -1d>” but “+1d” when it is “<2025-01-22 Wed +1d --1d>”.)


Emacs  : GNU Emacs 29.4 (build 2, aarch64-apple-darwin21.6.0, NS appkit-2113.65 Version 12.7.4 (Build 21H1123))
 of 2024-08-19
Package: Org mode version 9.6.15 (release_9.6.15 @ /opt/homebrew/Cellar/emacs-plus@29/29.4/share/emacs/29.4/lisp/org/)