Doc fixes related to diary-sort-entries.

* lisp/calendar/diary-lib.el (diary-list-entries-hook, diary-sort-entries):
Doc fixes.

* doc/emacs/cal-xtra.texi (Fancy Diary Display): Emphasize that sort
should be the last hook item.

doc/emacs/ChangeLog

 2010-09-14  Glenn Morris  <rgm@gnu.org>
 
+	* cal-xtra.texi (Fancy Diary Display): Emphasize that sort should be
+	the last hook item.
+
 	* calendar.texi (Appointments): Also updated when a diary include file
 	is saved.
 

doc/emacs/cal-xtra.texi

@@ -613,7 +613,9 @@ each day's diary entries by their time of day.  Here's how:
 @noindent
 For each day, this sorts diary entries that begin with a recognizable
 time of day according to their times.  Diary entries without times come
-first within each day.
+first within each day.  Note how the sort command is placed at the end
+of the hook list, in case earlier members of the list change the order
+of the diary entries, or add items.
 
 @vindex diary-include-string
   Your main diary file can include other files.  This permits a group of

lisp/ChangeLog

 2010-09-14  Glenn Morris  <rgm@gnu.org>
 
+	* calendar/diary-lib.el (diary-list-entries-hook, diary-sort-entries):
+	Doc fixes.
+
 	* calendar/diary-lib.el (diary-included-files): New variable.
 	(diary-list-entries): Maybe initialize diary-included-files.
 	(diary-include-other-diary-files): Append to diary-included-files.

lisp/calendar/diary-lib.el

@@ -187,11 +187,12 @@ you will probably also want to add `diary-mark-included-diary-files' to
 
      (setq diary-display-function 'diary-fancy-display)
      (add-hook 'diary-list-entries-hook 'diary-include-other-diary-files)
-     (add-hook 'diary-list-entries-hook 'diary-sort-entries)
+     (add-hook 'diary-list-entries-hook 'diary-sort-entries t)
 
 in your `.emacs' file to cause the fancy diary buffer to be displayed with
 diary entries from various included files, each day's entries sorted into
-lexicographic order."
+lexicographic order.  Note how the sort function is placed last,
+so that it can sort the entries included from other files."
   :type 'hook
   :options '(diary-include-other-diary-files diary-sort-entries)
   :group 'diary)
@@ -1584,7 +1585,10 @@ be used instead of a colon (:) to separate the hour and minute parts."
                       (string-lessp ts1 ts2)))))))
 
 (defun diary-sort-entries ()
-  "Sort the list of diary entries by time of day."
+  "Sort the list of diary entries by time of day.
+If you add this function to `diary-list-entries-hook', it should
+be the last item in the hook, in case earlier items add diary
+entries, or change the order."
   (setq diary-entries-list (sort diary-entries-list 'diary-entry-compare)))
 
 (define-obsolete-function-alias 'sort-diary-entries 'diary-sort-entries "23.1")