Can you develop for Sailfish on Sailfish?

One of my biggest frustrations with tablets and phones today is that you can't develop an app for the device on the device itself (aside from some third party tools on Android) - you have to use a bloated IDE on a desktop OS. I think this does a great disservice to children and others who want to learn development. So is it possible to develop an app for Sailfish on a device running Sailfish? Edit: It appears this is possible, so what tools and languages exist for doing this now? Can QT Creator run on Sailfish?