Re: `M-.' can't skip to the corresponding DEFUN from within the Apropos buffer.

[Daniel Martín]

Hongyi Zhao <hongyi.zhao@gmail.com> writes:

>>
>> - Create a buffer-local binding for xref-backend-functions in Apropos
>>   buffers where you prepend elisp--xref-backend to the list.
>>
>
> I've read some relevant document [1], but still can't figure out how
> to set this feature in my initialization file.
>
> [1] 
> https://www.gnu.org/software/emacs/manual/html_node/elisp/Creating-Buffer_002dLocal.html
>

You could add something like

(add-hook 'apropos-mode-hook
          (lambda ()
            (add-hook 'xref-backend-functions
                      #'elisp--xref-backend nil t)))

apropos-mode-hook is the hook that is invoked when apropos-mode is
turned on.  Notice that I pass t as the fourth argument to add-hook;
that says to modify the buffer-local value of xref-backend-functions,
not the global value.  As the code is evaluated when apropos-mode is
turned on, the current buffer will be the Apropos buffer and the change
will only have an effect on that buffer.