On tor, 2012-09-27 at 15:26 +0200, Patrick Ohly wrote:
Instead of one single iCalendar file, perhaps you can write and update
individual items in a directory, where each file is a VALENDAR with a
VTODO inside? That is something that the existing file backend in
SyncEvolution can read and write. The file backend uses file
modifications to detect changes, so you would have to make sure not to
rewrite files unless they really changed.

That's certainly doable. I'll probably make a single-file or multi-file option choice available as a command-line option.

Ole Wolf
Rødhættevej 4 • 9400 Nørresundby
Telefon: 9632-0108 • Mobil: 2467-5526 • Skype: ole.wolf