6.2.5.4 Functions for finding which project a file is in

Lisp variable: determine-project-hook

Type: Hook

Default value: nil

Functions to find which project and project group a file belongs in.

Functions on this list should return

1. a list of (group project) if matched,
2. a list of (nil nil) if they want to say this file's comments should be ignored
3. nil if they do not recognize the filename

The first one to answer gets it.

If none of these functions answers, sidebrain-file-projects are tried.