Docs feedback: Custom Git Hooks

https://docs.gitlab.com/ce/administration/custom_hooks.html

How can I know which commands are supported by the custom hooks, for instance, I want to add a pre-receive that run uncrustify on our code, is uncrustify installed on gitlab.org?

This issue is not limited to uncrustify, it would be nice to have a list with the supported commands.

Thanks!!!