I have been seeing persistent errors of "Cannot restart clock because task does not contain unfinished 
clock" when auto-resuming a saved (persistent) clock.  I believe I've tracked the error down to an 
extraneous space in a regexp ("^[ \t]* " when it should be "^[ \t]*").

This patch fixes the issue for me (in `org-clock-in'), and it makes the same 
change in `org-clock-find-position'.  I've tested this briefly and it works for 
me; nothing about clocking-in behavior seems to break, and persistent clocks 
work now.

I've also wrapped `regexp-quote' around instances where org-clock-string is 
used to build a regexp, in case someone puts funny characters in their 
org-clock-string.

Hopefully, the patch is attached correctly and Thunderbird didn't mangle it.

Cheers!
Joe V.


From c9d76b191d665e51aa3cea42b86befdc2fe4390c Mon Sep 17 00:00:00 2001
From: Joe Vornehm Jr <vorn...@optics.rochester.edu>
Date: Sat, 31 Dec 2011 02:05:55 -0500
Subject: [PATCH] Fix regexps in org-clock.el

* org-clock.el (org-clock-in): Remove extraneous space from regexp
used to find dangling clock lines when resuming a clock.  Also apply
`regexp-quote' where org-clock-string is used in a regexp.
(org-clock-find-position): Remove extraneous space from regexp used to
find dangling clock lines when resuming a clock.  Also apply
`regexp-quote' where org-clock-string is used in a regexp.

I have been seeing errors of "Cannot restart clock because task does
not contain unfinished clock" when auto-resuming a saved (persistent)
clock.  Deleting the extra space (in `org-clock-in' at least) puts an
end to these errors.

TINYCHANGE
---
 lisp/org-clock.el |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lisp/org-clock.el b/lisp/org-clock.el
index b29f47b..7ad76d5 100644
--- a/lisp/org-clock.el
+++ b/lisp/org-clock.el
@@ -1115,7 +1115,7 @@ the clocking selection, associated with the letter `d'."
            (cond
             ((and org-clock-in-resume
                   (looking-at
-                   (concat "^[ \t]* " org-clock-string
+                   (concat "^[ \t]*" (regexp-quote org-clock-string)
                            " \\[\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\}"
                            " *\\sw+\.? +[012][0-9]:[0-5][0-9]\\)\\][ \t]*$")))
              (message "Matched %s" (match-string 1))
@@ -1239,7 +1239,7 @@ line and position cursor in that line."
                  (or (bolp) (newline))
                  (point)))
           (end (progn (outline-next-heading) (point)))
-          (re (concat "^[ \t]*" org-clock-string))
+          (re (concat "^[ \t]*" (regexp-quote org-clock-string)))
           (cnt 0)
           (drawer (if (stringp org-clock-into-drawer)
                       org-clock-into-drawer "LOGBOOK"))
@@ -1247,7 +1247,7 @@ line and position cursor in that line."
       (goto-char beg)
       (when (and find-unclosed
                 (re-search-forward
-                 (concat "^[ \t]* " org-clock-string
+                 (concat "^[ \t]*" (regexp-quote org-clock-string)
                          " \\[\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\}"
                          " *\\sw+ +[012][0-9]:[0-5][0-9]\\)\\][ \t]*$")
                  end t))
-- 
1.7.5.1

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