meta-complete-list

meta-complete-list is a variable defined in `meta-mode.el'.
Its value is

nil

Documentation:
List of ways to perform completion in Metafont or MetaPost mode.

Each entry is a list with the following elements:
1. Regexp matching the preceding text.
2. A number indicating the subgroup in the regexp containing the text.
3. A function returning an alist of possible completions.
4. Text to append after a successful completion (if any).

Or alternatively:
1. Regexp matching the preceding text.
2. Function to do the actual completion.