This is a fork of this bzr repository http://wilmer.gaa.st/selphy/ from Wilmer van der Gaast (@Wilmer in twitter).
It's basically a Go program to send pictures to a Canon Selphy CP900 printer connected via wifi. This at least lets you print from OSX because Canon does not provide drivers for latest versions the Apple OS.
Check the original README for more info about it.
I added the binary for Yosemite in case you don't want to build it yourself.
I tried to print a picture checking the printer IP from the router info page like this:
./selphy -printer_ip="192.168.1.133" ~/Pictures/print-01.jpg
And worked great, so thanks Wilmer! ;-)