Kroman is ultimate Korean hangul romanization tool. It has a lot of implementations.
This is the TextMate bundle.
Download this bundle and move to your bundle folder.
Since TextMate follows strong unix philosophy, in order to use this bundle, you should have kroman command line tool installed. See http://github.com/cheunghy/kroman for how to install it on a mac.
Romanize File
Romanize Region
Bug reports and pull requests are welcome on Github at http://github.com/cheunghy/kroman-tm.
Kroman is available as open source under the terms of the MIT License.