Set-up:
Once Textpad (http://www.textpad.com) is installed, add the hugo.syn file to the system folder in the directory where TextPad has been installed. Open the program, go to Configure, select New Document Class, and make a class for Hugo with the proper extensions and select the Hugo syntax file when you get the chance. I think there's an option to turn on line numbering around there, too. After that, you'd probably want to go to the document classes tab in preferences, find Hugo, and change the keyword colors to whatever you want.