Case sensitive matching

[Ola Olsson]

Would it be possible to support case sensitive matching using style dispatchers? As far as I can tell, it's not currently possible, but such a solution would be more flexible than toggling completion-ignore-case manually.

I am aware of orderless-smart-case but as all "smart case" solutions it doesn't work when the thing you're interested in is all lower case.

[Omar Antolín Camarena]

You could do something like this

(defun case-dispatcher (target _index _total)
  (when (equal "&&" target)
    (setq-local orderless-smart-case nil completion-ignore-case nil)
    '(orderless-literal . "")))

(add-to-list 'orderless-style-dispatchers #'case-dispatcher)

Then, whenever you toss in a component that is && the matching turns case sensitive (even if you delete the &&) for the rest of the current minibuffer session.

[Daniel Mendler]

As a better alternative to your example above one can probably define a custom pattern compiler which either sets or unsets completion-ignore-case depending on the presence of &&, such that it won't affect the session forever?

[Omar Antolín Camarena]

Yes, one could. But you can also make that same style dispatcher turn off case sensistivity when given a single &. That way to turn it off again you just delete a & (or both).

[Ola Olsson]

It appears style dispatching is more flexible than I thought. This'll work fine for my needs. Thank you!