Xcode 4 plugin development

As far as I know there is no official way to create Xcode 4 plugins (just like there wasn't one for v3.x).

Here is an openradar on Xcode's lack of plugin support:

Please support the ability for 3rd parties to extend Xcode via a public plugin API. Aperture, Visual Studio, Eclipse, TextMate and other applications benefit from this ability. I would like to see more advanced refactorings, code analysis (think Resharper by Jetbrains) and modeling.

Provide plugin API for Xcode 4 (rdar://8622025)

Please dupe this if you want plugins!

Edit: Just stumbled upon this:

Cédric Luthi: "Xcode 4 does support user-defined plugins, see CLITool-InfoPlist for an example of a working Xcode 4 plugin. You just have to add XC4Compatible (true) in the Info.plist."

https://github.com/0xced/CLITool-InfoPlist

That being said these GitHub repos might be handy, too:

• Xcode4 Plugin-API Documentation (link dead)

• Xcode Plugin Template (link updated)

Further more mogenerator's Xmod plugin might be a good starting point.
(Wasn't Xcode-4 compatible yet, last time I checked, though)