GNU bug report logs - #12898
24.2.50.1; Completion is not passed further on in emacs-lisp, org-mode etc.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Vitalie Spinu <spinuvit <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50.1;
	Completion is not passed further on in emacs-lisp, org-mode etc.
Date: Thu, 15 Nov 2012 18:14:30 +0100

Hi, 

If I do 

   (add-hook 'completion-at-point-functions 'comint-filename-completion)

with the hope that the filename completion will be available on C-M-i
(completion-at-point).

Unfortunately C-M-i does nothing after "/hom in emacs-lisp, octave-mode
and org-mode (the only ones that I have checked). It works in this
message buffer though :).

In elisp mode completion-at-point-functions is set to
(lisp-completion-at-point t). If I set it to (t), filename completion
works as expected. So, it's the lisp-completion-at-point that is not
handing the completion over.

How to handle this?

    Thanks,
    Vitalie

PS: BTW, would it make sense to add filename completion to global
completion list alongside tag completion?




In GNU Emacs 24.2.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.13)
 of 2012-11-15 on vitoshka-home
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
System Description:	Ubuntu 12.10

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  global-auto-complete-mode: t
  auto-complete-mode: t
  diff-auto-refine-mode: t
  helm-match-plugin-mode: t
  shell-dirtrack-mode: t
  eldoc-mode: t
  show-paren-mode: t
  savehist-mode: t
  display-time-mode: t
  ido-everywhere: t
  global-auto-revert-mode: t
  global-subword-mode: t
  subword-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  hs-minor-mode: t

Recent input:
M-x r e p o r <return>

Recent messages:

"--> loading .eORG.el"

Loading /home/vitoshka/Dropbox/.main/.eORG.el (source)...
Loading /home/vitoshka/VC/org-mode/lisp/org-loaddefs.el (source)...done
Appointment reminders enabled (no diary file found)
Loading /home/vitoshka/Dropbox/.main/.eORG.el (source)...done
Startup took: 5.320652961730957
For information about GNU Emacs and the GNU system, type C-h C-a.
Source file `/home/vitoshka/Dropbox/ELPA/smex-20120915.2041/smex.el' newer than byte-compiled file

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Message #8 received at 12898 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Vitalie Spinu <spinuvit <at> gmail.com>
Cc: 12898 <at> debbugs.gnu.org
Subject: Re: bug#12898: 24.2.50.1;
	Completion is not passed further on in emacs-lisp, org-mode etc.
Date: Thu, 15 Nov 2012 13:40:37 -0500

> In elisp mode completion-at-point-functions is set to
> (lisp-completion-at-point t).  If I set it to (t), filename completion
> works as expected.  So, it's the lisp-completion-at-point that is not
> handing the completion over.

Indeed, lisp-completion-at-point should return nil when it determines
that it cannot provide completion information for the text around point.
Problem is: how should it determine that?


        Stefan

Message #11 received at 12898 <at> debbugs.gnu.org (full text, mbox):

From: Vitalie Spinu <spinuvit <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 12898 <at> debbugs.gnu.org
Subject: Re: bug#12898: 24.2.50.1;
	Completion is not passed further on in emacs-lisp, org-mode etc.
Date: Tue, 20 Nov 2012 13:27:45 +0100

[Message part 1 (text/plain, inline)]

  >> Stefan Monnier <monnier <at> iro.umontreal.ca>
  >> on Thu, 15 Nov 2012 13:40:37 -0500 wrote:

  >> In elisp mode completion-at-point-functions is set to
  >> (lisp-completion-at-point t).  If I set it to (t), filename completion
  >> works as expected.  So, it's the lisp-completion-at-point that is not
  >> handing the completion over.

  SM> Indeed, lisp-completion-at-point should return nil when it determines
  SM> that it cannot provide completion information for the text around point.
  SM> Problem is: how should it determine that?


There is an inbuilt facility (:exclusive 'no). Why is that not the default?

This solves the problem:

[patch (text/x-diff, inline)]

diff --git a/lisp/emacs-lisp/lisp.el b/lisp/emacs-lisp/lisp.el
index bcb7fab..680673d 100644
--- a/lisp/emacs-lisp/lisp.el
+++ b/lisp/emacs-lisp/lisp.el
@@ -699,6 +699,7 @@ considered."
 	      :predicate predicate
 	      :annotation-function
 	      (unless (eq predicate 'fboundp)
-		(lambda (str) (if (fboundp (intern-soft str)) " <f>"))))))))
+		(lambda (str) (if (fboundp (intern-soft str)) " <f>")))
+              :exclusive 'no)))))
 
 ;;; lisp.el ends here
diff --git a/lisp/progmodes/octave-mod.el b/lisp/progmodes/octave-mod.el
index ab5a19f..04bad8e 100644
--- a/lisp/progmodes/octave-mod.el
+++ b/lisp/progmodes/octave-mod.el
@@ -975,7 +975,8 @@ otherwise."
         ;; Extend region past point, if applicable.
         (save-excursion (skip-syntax-forward "w_")
                         (setq end (point))))
-    (list beg end octave-completion-alist)))
+    (list beg end octave-completion-alist
+          :exclusive 'no)))
 
 (define-obsolete-function-alias 'octave-complete-symbol
   'completion-at-point "24.1")

[Message part 3 (text/plain, inline)]

Vitalie

Message #14 received at 12898 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Vitalie Spinu <spinuvit <at> gmail.com>
Cc: 12898 <at> debbugs.gnu.org
Subject: Re: bug#12898: 24.2.50.1;
	Completion is not passed further on in emacs-lisp, org-mode etc.
Date: Tue, 20 Nov 2012 08:42:56 -0500

>>> In elisp mode completion-at-point-functions is set to
>>> (lisp-completion-at-point t).  If I set it to (t), filename completion
>>> works as expected.  So, it's the lisp-completion-at-point that is not
>>> handing the completion over.
SM> Indeed, lisp-completion-at-point should return nil when it determines
SM> that it cannot provide completion information for the text around point.
SM> Problem is: how should it determine that?
> There is an inbuilt facility (:exclusive 'no).  Why is that not the default?

Because it only works for prefix-completion, so it's a crutch.
The right way to do it is for lisp-completion-at-point function to
determine whether the data at point should/can be a Lisp name or a file
name or both (if it's both, it could use the :exclusive crutch, or it
could combine the completion tables with completion-table-in-turn).


        Stefan

Message #17 received at 12898 <at> debbugs.gnu.org (full text, mbox):

From: Vitalie Spinu <spinuvit <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 12898 <at> debbugs.gnu.org
Subject: Re: bug#12898: 24.2.50.1;
	Completion is not passed further on in emacs-lisp, org-mode etc.
Date: Tue, 20 Nov 2012 15:47:30 +0100

  >> Stefan Monnier <monnier <at> iro.umontreal.ca>
  >> on Tue, 20 Nov 2012 08:42:56 -0500 wrote:

  >>>> In elisp mode completion-at-point-functions is set to
  >>>> (lisp-completion-at-point t).  If I set it to (t), filename completion
  >>>> works as expected.  So, it's the lisp-completion-at-point that is not
  >>>> handing the completion over.
  SM> Indeed, lisp-completion-at-point should return nil when it determines
  SM> that it cannot provide completion information for the text around point.
  SM> Problem is: how should it determine that?
  >> There is an inbuilt facility (:exclusive 'no).  Why is that not the default?

  SM> Because it only works for prefix-completion, so it's a crutch.

This completely defeats the idea of completion-at-point-functions, and
is makes the completion in emacs-24 pretty much useless at this point.



  SM> The right way to do it is for lisp-completion-at-point function to
  SM> determine whether the data at point should/can be a Lisp name or a file
  SM> name or both (if it's both, it could use the :exclusive crutch, or it
  SM> could combine the completion tables with completion-table-in-turn).

Are you suggesting that every single xxx-mode-completion-function should
do that? That is, check for all possible combination that a symbol at
point might represent? That doesn't look right to me.



Why the final completion is done in completion-at-point and not in
completion--capf-wrapper? This split across two functions asks for
trouble. Wouldn't it be possible to handle everything in
completion--capf-wrapper and call completion-in-region instead of
try-completion in the handling of (:exclusive 'no) part?

    Vitalie

Message #20 received at 12898 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Vitalie Spinu <spinuvit <at> gmail.com>
Cc: 12898 <at> debbugs.gnu.org
Subject: Re: bug#12898: 24.2.50.1;
	Completion is not passed further on in emacs-lisp, org-mode etc.
Date: Tue, 20 Nov 2012 13:22:29 -0500

> Are you suggesting that every single xxx-mode-completion-function should
> do that?

Depends what you mean by "do that".  If you mean "be careful to only
return non-nil when you positively know that point is in a place where
this completion-table is a good choice", then yes.

> That is, check for all possible combination that a symbol at
> point might represent?

No, indeed, this is a rare need.

> Why the final completion is done in completion-at-point and not in
> completion--capf-wrapper?

Because the completion data returned by completion-at-point-functions
might not even be used to perform completion.  E.g. it might be used to
decide whether we're leaving the current completion field (and hence
can hide the *Completions* buffer).


        Stefan

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