convenience sort function

convenience sort function

[Christian Wittern]

Dear org users,

I would like to define a convenience sort function to sort on a certain 
property (e.g PRE), which I can assign to a key, so that I can avoid having 
to type

C-^ r PRE <RET>

It seems that I want to call org-sort-entries, which has the following 
signature:

(defun org-sort-entries
   (&optional with-case sorting-type getkey-func compare-func property)

 From the docstring, I learn that I have to use ?r to sort on properties and 
the last parameter is the property to sort on, "PRE" in this case.  However, 
what I do not understand is what I should give for getkey-func and 
compare-func.
Something like this
(org-sort-entries t ?r t t "PRE")
or this
(org-sort-entries t ?r nil nil "PRE")
does not work, and reading the source does not give me any clues (probably 
because I do not understand what is going on....)

Any help would be apprectiated,

Christian


-- 
Christian Wittern, Kyoto