[Freeassociation-devel] BYSETPOS

[Álvaro Manera]

Hi again,

Currently libical doesn't have the proper support of BYSETPOS. 

The problem is with "BYSETPOS=-1" (no support) and with "BYSETPOS=1" (this 
workes incorrectly when first day of month is in BYDAY, but has position differ 
from 1).

For yearly recurrences with BYSETPOS (rules like 
"FREQ=YEARLY;COUNT=6;BYDAY=SU,SA;BYMONTH=7,8,9;BYSETPOS=1,-1") there is no 
support in libical.

Here is the patch with modification in the iterators. Please check it, and if 
you think it's ok I'll commit. 

I have done some testing and it seems to work ok, but if you have more tests 
please run them   also.

Alvaro
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