From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Vitalie Spinu <spinuvit@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Completion with (:exclusive 'no) is called twice, and doesn't pass over on sole completion.
Date: Fri, 16 Mar 2012 13:20:19 -0400 [thread overview]
Message-ID: <jwv7gyklb5a.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87haxoyff9.fsf@gmail.com> (Vitalie Spinu's message of "Fri, 16 Mar 2012 12:05:14 +0100")
> The completion in Emacs 24 is called twice. For example
> (defun foo-completion ()
> (when (save-excursion (re-search-backward "\\<\\w*" (point-at-bol) t))
> (let ((token (match-string-no-properties 0))
> (beg (match-beginning 0))
> (end (match-end 0)))
> (message "%s:" token)
> (when (= end (point))
> (list beg end (list "aaaa" "aaaaaaa" "bbbb" "truncat") :exclusive 'no)))))
> (add-to-list 'completion-at-point-functions 'foo-completion)
> ;; it is now (foo-completion lisp-completion-at-point t)
> Place your point at the end of 'aaaa and you try to complete. I am
> getting
> aaa:
> aaaa:
> in my message buffer. Which means the completion is called twice.
Not sure why, but not terribly problematic either.
> I hope this is not an intended behavior, as it might seriously
> interfere with custom completion. For example I might want to have
> a different behavior on the second consequent invocation of the
> completion (give a message, modify the candidates etc).
No, completion-at-point-functions should return completion data and
can't know what that data will be used for. Could be for TAB
completion, for on-the-fly popup completion à la auto-complete, for
display of the *Completions* buffer, or to decide whether we're still in
the same completion field (so as to pop-down the *Completions* buffer
when we leave that field), ...
> Second problem is that if the completion is sole, the handling is not
> passed over.
That's expected: completion is only passed over if the text doesn't
match any candidate.
Stefan
next prev parent reply other threads:[~2012-03-16 17:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-16 11:05 Completion with (:exclusive 'no) is called twice, and doesn't pass over on sole completion Vitalie Spinu
2012-03-16 12:18 ` Vitalie Spinu
2012-03-16 17:20 ` Stefan Monnier [this message]
2012-03-16 19:33 ` Vitalie Spinu
2012-03-17 22:34 ` Stefan Monnier
2012-03-17 22:43 ` Lennart Borgman
2012-03-17 23:33 ` Vitalie Spinu
2012-03-18 2:03 ` Stefan Monnier
2012-03-18 9:35 ` Vitalie Spinu
2012-03-18 15:42 ` Stefan Monnier
2012-03-18 19:18 ` Vitalie Spinu
2012-03-19 0:53 ` Stefan Monnier
2012-03-19 8:35 ` Vitalie Spinu
2012-03-19 12:49 ` Stefan Monnier
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