Re: Question about xref and adding "find all references" button to built-in help

[Dmitry Gutov <dgutov@yandex.ru>]

On 20.09.2021 23:52, Arthur Miller wrote:

>> That's just 'M-x xref-find-references'. Try it in an Elisp buffer.
>>
>> The implementation is fairly simple: see 'xref-backend-references' in xref.el
>> and elisp-load-path-roots.
> 
> Thank you that was what I needed. I have tried it, will have to test and look
> around a bit more.
> 
>> For your own backend, you will probably not dispatch through project.el method,
>> and use load-path directly combined with package-user-dir. Maybe after pruning
>> it for entries that reside inside other entries.
> 
> Yes probably. I thought I could skip writing a backend; but i'll see.

I think it might be easier to defined a separate backend (say, called 
'elisp-help), but go ahead and experiment.

>>>> But you probably want this to work in installed Emacs as well?
>>> What do you mean by "installed Emacs"? Emacs without sources? Sorry, I just
>>> woke
>>> up, have to get that coffein going up :).
>>
>> Without sources or with compressed sources.
> 
> Yes. Maybe it would be possible to search in elc files? I mean some functions
> have opcodes, but more are called by name. But I meant just when sources are
> avialable, when 'source-directory' is not nil.

I don't know. Searching compressed sources (after the user installs 
them) might be a closer goal.

Or perhaps this feature will be mostly used by people who already have 
an Emacs sources checked out anyway.

>>> What about to just have a keyboard shortcuts; say 'R', instead of link. With
>>> source code displayed it already looks a bit crouded. I think helpfuls buffer
>>> looks a bit busy with all the links.
>>> I could imagine living with just a shortcut and maybe a context menu item.
>>
>> I don't really have an opinion on the UI part of this. It can be a button,
>> command, whatever.
>>
>>> I attached a screeshots of helpful and built-in help with my yserdays patch both
>>> showing source code for the comparison.
>>
>> UI for references and definitions will probably need to be different, no?
> 
> A whole ui? :) I just meant a key, like for sources of info view. Helpful has a
> link, but I would like to skip the link.

Ah, I see it now. You wanted to show the "Find all references" button 
printed by Helpful.