Re: make project--find-in-file generic, add interactive filename to project-find-file

[Dmitry Gutov]

On 01/28/2016 04:14 PM, Stefan Monnier wrote:

> Details of whether completing-read checks the validity of DEFAULT
> against the completion table shouldn't determine whether we use DEFAULT
> or INITIAL-INPUT.  After all, if we want it to be checked, we can
> perform that check manually.

But in the current use case, the "filename at point" will almost always 
_not_ be in the completion table. And it may even have several 
expansions, not just one. Because it's only a part of the file name: 
maybe it's the base name, or maybe it doesn't even have an extension.

Oh! Should we use minibuffer-default-add-function instead?

> This would also allow users to replace this function with one which
> handles DEFAULT differently (e.g. inserting it as initial-input but
> pre-selected so that delete-selection-mode deletes it in many cases).

I'm not sure that delete-selection-mode is the answer: the user might 
have to type some additional characters, to disambiguate the initial-input.