caldr/misc, branch master icalendar / rfc2445 handling misc: add nix-shell that provides all dependencies 2018-09-08T21:53:17+00:00 Philipp Gesang phg@phi-gamma.net 2018-09-08T21:53:17+00:00 84deebeb4d714e5f8a6cac1829fed5ec4aa63418