[PATCH] org-agenda-list (from git) giving "args-out-of-range error"

[Karl Fogel <kfogel@red-bean.com>]

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Nick Dokos <nicholas.dokos@hp.com> writes:
>There have been a couple of recent reports on this problem (headlines
>with just a timestamp cause this error) in addition to the ones you
>found:
>
>    http://thread.gmane.org/gmane.emacs.orgmode/52621
>    http://thread.gmane.org/gmane.emacs.orgmode/52786
>
>The first one contains a diagnosis and a (possibly wrong) suggested fix.

Thank you, Nick.  I eventually found the same cause, by doing a
binary-search reduction of the problematic .org file until I knew
exactly which headline was the source of the problem.  It was a
second-level headline with a date but no content...

  ** <2012-02-27 Mon>

...as described in James Atwood's mail (the second one you list above).

It's relevant that the line ends immediately after the ">".  If there is
even one space after the ">", then the bug does not reproduce.  This
makes sense, given the code.  I have a tentative patch, which is
attached.  What's the typical way to submit such things for review?


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From 8a4c65479b2f62cbffe32735c4afac5dd6a1ecae Mon Sep 17 00:00:00 2001
From: Karl Fogel <kfogel@red-bean.com>
Date: Wed, 29 Feb 2012 13:06:06 -0600
Subject: [PATCH] * lisp/org-agenda.el (org-agenda-highlight-todo): Handle the
 case of a heading that has a date but no todo keyword. 
 This is a fix for the args-out-of-range bug discussed in
 these threads

  http://thread.gmane.org/gmane.emacs.orgmode/52621
  http://thread.gmane.org/gmane.emacs.orgmode/52793
  http://thread.gmane.org/gmane.emacs.orgmode/52786
  http://thread.gmane.org/gmane.emacs.orgmode/52810

among Ilya Shlyakhter, James Atwood, Nick Dokos, and myself.  The subject headers are:

  bug report: agenda timeline crashes
  Bug report: weekly agenda and blank, timestamped headers
  org-agenda-list (from git) giving "args-out-of-range error"
---
 lisp/org-agenda.el |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index 98a2cc0..ac1b5b1 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -5889,8 +5889,18 @@ could bind the variable in the options section of a custom command.")
       (let ((pl (text-property-any 0 (length x) 'org-heading t x)))
 	(setq re (get-text-property 0 'org-todo-regexp x))
 	(when (and re
+		   ;; Test `pl' because if there's no heading content,
+		   ;; there's no point matching to highlight.  Note
+		   ;; that if we didn't test `pl' first, and there
+		   ;; happened to be no keyword from `org-todo-regexp'
+		   ;; on this heading line, then the `equal' comparison
+		   ;; afterwards would spuriously succeed in the case
+		   ;; where `pl' is nil -- causing an args-out-of-range
+		   ;; error when we try to add text properties to text
+		   ;; that isn't there.
+		   pl
 		   (equal (string-match (concat "\\(\\.*\\)" re "\\( +\\)")
-					x (or pl 0)) pl))
+					x pl) pl))
 	  (add-text-properties
 	   (or (match-end 1) (match-end 0)) (match-end 0)
 	   (list 'face (org-get-todo-face (match-string 2 x)))
-- 
1.7.9