Great! When are you going to start working on it?

Without the individuals willing to put in the work then directions like this are pointless, however well intentioned. Since no-one attached to the development of Textmate has expressed any interest in porting over to Linux, or any other platform, I find it unlikely that the situation will change in the near future.

It would probably be easier to write a new editor (in a different language) from scratch with a compatibility layer for TextMate bundles.

Check Sublime Text 2, it runs on Linux, Mac and Windows ... It also works with TextMate bundles.

Redcar is compatible with TextMate bundles

Or bring the GNUstep framework on par with Cocoa. Would be many years of work in either case.

I don't see the need to port TextMate to Linux. We already have Vim/Emac/Gedit.

I agree however you forgot to mention the excellent Geany, which looks more comparable, and I think it be better for a developer to spend time improving that rather than porting a heavily MacOS based editor.

Indeed, we already have things like Emacs, Vim, etc. But this is not Windows, not Mac. This is SPARTAA^W GNU/Linux and there people should have freedom of choice.

And Sublime Text 2.

Exactly. For those who dont't like the learning curves of these editors, there are easy to learn and well designed editors like Sublime Text, Bluefish, Geany.