Coda Plug-in Creator
Plug-ins appear in Coda's menu, and can be bound to specific keyboard shortcuts.
For plug-in authors who are not familiar with Cocoa, but wish to write a simple text-manipulation plug-in for Coda in a high-level scripting language, we provide the Coda Plug-in Creator.
If you're familiar with "commands" in TextMate bundles, you'll feel right at home with Coda script plug-ins.
Your script can be written in any language for which you have installed a command line interpreter, including Perl, Ruby, shell scripting languages, among others.