GNU bug report logs - #19854
Document new behaviour of elisp at point completion wrt

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From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 19854 <at> debbugs.gnu.org, Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Subject: bug#19854: 25.0.50; completion-extra-properties in emacs-25
Date: Mon, 27 Jun 2016 00:15:06 -0400

On Sun, Jun 26, 2016 at 9:28 PM, Dmitry Gutov <dgutov <at> yandex.ru> wrote:
> To be thorough, though, AFAIK "function position" means something specific
> to a Lisp programmer: the first element of a list.
>
> Whereas we also look at whether the whole form is quoted (and if so, offer
> all kinds of symbols as completions anyway), and we can also offer
> function-only completions in a non-function position if the function
> position contains one of the known macros (such as cl-callf or
> declare-function).

Okay, maybe using the word "context" instead of "position" works
better? (trying not to get overly specific in the docstring)

(defun elisp-completion-at-point ()
  "Function used for `completion-at-point-functions' in `emacs-lisp-mode'.
If the context at point allows only a certain category of
symbols (e.g. functions, or variables) then the returned
completions are restricted to that category.  In contexts where
any symbol is possible (following a quote, for example),
functions are annotated with \"<f>\" via the
`:annotation-function' property."

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