Re: Thoughts on Refactoring In-Buffer Completion In message.el

[Stefan Monnier <monnier@iro.umontreal.ca>]

> - figure out, and implement how to add completion category metadata to
>   completion tables;

We really should provide a `completion-table-with-metadata` function to
do that, but basically it can start with something like:

    (defun completion-table-with-metadata (table metadata)
      (lambda (string pred action)
        (if (eq action 'metadata)
            metadata
          (complete-with-action action table string pred))))

[ You may want to make spice it up in case you want to handle the case
  where `table` already provides some metadata which you'd then want
  to augment. ]


        Stefan