bug#67687: Feature request: automatic tags management

[Jon Eskin]

> All right, sounds like this kind of limited guarantees (tags getting out of 
> date occasionally, e.g. when switching branches) is apparently okay.
> 
> See attached the aforementioned related work, with some updates and 
> simplifications (e.g. this version of the patch doesn't require a change to 
> project.el).
> 
> Usage: 'M-x etags-regen-mode' to turn it on (or customize this variable, to 
> have it on from the beginning of each session), then as soon as you use 
> features based on tags (such as M-. or completion) the table should get 
> generated automatically for the current project, and then get updated when 
> files are edited and saved.
> 
> Some features could be added later (such as asynchronous updates or -- 
> someday -- filenotify based invalidations), but I think the current state is 
> useful already.
> 
> Feedback welcome.<etags-regen.diff>


Wow! This is excellent, worked like a charm on my end.

I’m going to get this set up on a few different machines and take some time to 
build feedback.

Thank you!