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bug#19468: 25.0.50; UI inconveniences with M-.

From: Dmitry Gutov
Subject: bug#19468: 25.0.50; UI inconveniences with M-.
Date: Tue, 28 Apr 2015 01:25:14 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Thunderbird/36.0

On 04/27/2015 08:21 PM, Stefan Monnier wrote:

The different ways to call xref-find-function are to distinguish
jumping to the definition or to "all uses", and currently few backends
support those features, I don't think we have a clear idea yet of how
they should be presented to the user, and there are too many variants to
collapse them all into C-u.  So they'd probably be provided via
different commands instead of all being accessed via M-.

M-x xref-find-references, for starters.

-  (setq-local xref-find-function #'elisp-xref-find)
-  (setq-local xref-identifier-completion-table-function
-              #'elisp--xref-identifier-completion-table)
+  (add-function :before-until (local 'xref-find-function) #'elisp-xref-find)
+  (add-function :before-until (local 
+                #'elisp--xref-identifier-completion-table)

This doesn't look right:

- When I try to jump to a symbol, and there isn't one with that name, I want to see the message "no definitions found", not a "Visit tags table" prompt.

- If I do have a tags table loaded, it's likely for a different project than Emacs. This is most likely true for the majority of our users.

I think Eli (and everyone like-minded) should advise elisp-xref-find and xref-identifier-completion-table-function instead, inside their init script, like suggested by Daniel in another thread.

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