GantMate allows you to run Gant tasks for your project from within TextMate. It is currently available from here for testing purposes but will be integrated into the Groovy bundle eventually.
Grap the two zips from above. Unzip GantMate.zip and place in
~/Library/Application Support/TextMate/Bundles/Groovy.tmbundle/Support/. Unzip Run Gant Task.tmCommand.zip and double click to install. It should install itself in the Groovy bundle.
The default key mapping is control+shift+g and is scoped to Groovy source files.
This text is a replication of material found at http://groovy.codehaus.org/TextMate.