Given the cool recent activity around url shortening in Opera, I thought I could also give my small contribution.
In fact, a url shortening command is missing in Ubiquity for Opera. Or rather, it was missing.
There's a new command,
shorten-url, based on bit.ly's API, that allows you, as usual with Ubiquity commands, to shorten the current open tab URL, or shorten any URL you type in the Ubiquity window. Here you can see a screenshot as example:
As usual, you can download Ubiquity for Opera,
(or the minified version), or go to the Ubiquity for Opera github repository.