GNU bug report logs - #15012
23.3; read-char inappropriate echo area content

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

From: Bob Newell <bobnewell <at> bobnewell.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.3; read-char inappropriate echo area content
Date: Thu, 01 Aug 2013 21:12:41 -1000

If you run this minimal code:

(defun minimal-function ()
  (interactive)
    (while t
      (read-char-exclusive " ")
    )
)

everything works as expected, that is typed characters are simply
absorbed until C-g exits the loop. But notice the " " as the prompt arg
in read-char-exclusive. Why is it there?

Because if you run this:

(defun minimal-function ()
  (interactive)
    (while t
      (read-char-exclusive)
    )
)

everything you've typed since you've invoked the function shows up in
the echo area, like this:

ESC x m i n i m a l - f u n c t i o n RET a b c d e f g    (etc.)

I thought this might have something to do with minibuffer history, but I
can't verify that, and I've dived into EMACS source code without luck
(maybe without skill, too). I'm deep into keyboard.c and wondering...

Using "" instead of " " as a prompt does not work; the echoing still
happens.

read-char exhibits the exact same behavior.

I'm on 23.3.1 but I was told on gnus.emacs.help that the latest 24.x
builds show the same behavior (I can't verify personally.)




In GNU Emacs 23.3.1 (i686-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2013-05-16 on komainu, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
configured using `configure  '--build' 'i686-linux-gnu' '--build' 'i686-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.3/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.3/leim' '--with-crt-dir=/usr/lib/i386-linux-gnu' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i686-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Article

Minor modes in effect:
  iswitchb-mode: t
  anything-dired-mode: Enable anything completion in Dired functions.
Bindings affected are C, R, S, H.
This is deprecated for Emacs24+ users, use `ac-mode' instead.
  shell-dirtrack-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<escape> x r e p o r t - <return> e m a c s - b u g 
<return> C-g C-x C-f d a t a / e l i s p / m i n i 
m a l . e l <return> <left> <left> <escape> <backspace> 
<backspace> C-x C-s <escape> ` l B <escape> x m i n 
i m a l - f u n c t i o n <return> a a a a a C-g <right> 
<right> SPC C-x C-s <escape> ` l B <escape> x <up> 
<return> d d d d d d C-g C-x b * G <return> <return> 
<return> q <return> 2 0 0 <return> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <up> <up> 
<up> <return> C-x o <down> C-SPC <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <escape> w <escape> x r e p o r t - e m a c 
s - b u g <return>

Recent messages:
Compiling /home/bnewell/data/elisp/minimal.el...done
Wrote /home/bnewell/data/elisp/minimal.elc
Loading /home/bnewell/data/elisp/minimal.elc...done
Quit
Parsing BBDB... (frobnicating...done)
name mismatch: "chipschap" changed to "Bob Newell"
Mark set
Saved text from "If you run this minimal code:

(defun mi"

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/usr/share/emacs/23.3/site-lisp/auctex/latex hides /usr/share/emacs/site-lisp/auctex/latex
/usr/share/emacs/23.3/site-lisp/auctex/tex hides /usr/share/emacs/site-lisp/auctex/tex
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~/data/elisp/message-x hides /usr/share/emacs/23.3/site-lisp/gnus-bonus-el/message-x
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/usr/share/emacs/23.3/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup
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/usr/share/emacs/23.3/lisp/gnus/sasl hides /usr/share/emacs/23.3/lisp/net/sasl
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/usr/share/emacs/23.3/lisp/gnus/tls hides /usr/share/emacs/23.3/lisp/net/tls
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/usr/share/emacs/23.3/lisp/gnus/sasl-digest hides /usr/share/emacs/23.3/lisp/net/sasl-digest
/usr/share/emacs/23.3/lisp/gnus/hashcash hides /usr/share/emacs/23.3/lisp/mail/hashcash
/usr/share/emacs/23.3/lisp/gnus/uudecode hides /usr/share/emacs/23.3/lisp/mail/uudecode
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~/data/elisp/unsafep hides /usr/share/emacs/23.3/lisp/emacs-lisp/unsafep
/usr/share/emacs23/site-lisp/emms/tq hides /usr/share/emacs/23.3/lisp/emacs-lisp/tq
/usr/share/emacs/23.3/lisp/gnus/parse-time hides /usr/share/emacs/23.3/lisp/calendar/parse-time
~/data/elisp/icalendar hides /usr/share/emacs/23.3/lisp/calendar/icalendar
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Features:
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anything-complete anything-show-completion anything-obsolete
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url-privacy url-expand url-methods url-history url-cookie mailcap grep
compile tramp-imap assoc tramp-gw tramp-gvfs zeroconf url-util url-parse
url-vars dbus xml tramp-fish tramp-smb tramp-cache tramp-ftp tramp-cmds
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w3m-load mailcrypt-init emms-auto emacs-goodies-el emacs-goodies-custom
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auto-loads tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win
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page menu-bar rfn-eshadow timer select scroll-bar mldrag mouse jit-lock
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minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind system-font-setting
font-render-setting gtk x-toolkit x multi-tty emacs)

Message #8 received at 15012 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Bob Newell <bobnewell <at> bobnewell.net>
Cc: 15012 <at> debbugs.gnu.org
Subject: Re: bug#15012: 23.3; read-char inappropriate echo area content
Date: Wed, 14 Aug 2019 20:57:42 -0700

Bob Newell <bobnewell <at> bobnewell.net> writes:

> Because if you run this:
>
> (defun minimal-function ()
>   (interactive)
>     (while t
>       (read-char-exclusive)
>     )
> )
>
> everything you've typed since you've invoked the function shows up in
> the echo area, like this:
>
> ESC x m i n i m a l - f u n c t i o n RET a b c d e f g    (etc.)

(I'm going through old bug reports that have unfortunately gotten no
responses yet.)

I tried reproducing this bug in Emacs 27, but was unable to, so I'm
assuming it's fixed and is closing this bug report.  If you're still
seeing this, please reopen.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 15012 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: bobnewell <at> bobnewell.net, 15012 <at> debbugs.gnu.org
Subject: Re: bug#15012: 23.3; read-char inappropriate echo area content
Date: Thu, 15 Aug 2019 17:42:32 +0300

reopen 15012
thanks

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date: Wed, 14 Aug 2019 20:57:42 -0700
> Cc: 15012 <at> debbugs.gnu.org
> 
> Bob Newell <bobnewell <at> bobnewell.net> writes:
> 
> > Because if you run this:
> >
> > (defun minimal-function ()
> >   (interactive)
> >     (while t
> >       (read-char-exclusive)
> >     )
> > )
> >
> > everything you've typed since you've invoked the function shows up in
> > the echo area, like this:
> >
> > ESC x m i n i m a l - f u n c t i o n RET a b c d e f g    (etc.)
> 
> (I'm going through old bug reports that have unfortunately gotten no
> responses yet.)
> 
> I tried reproducing this bug in Emacs 27, but was unable to, so I'm
> assuming it's fixed and is closing this bug report.  If you're still
> seeing this, please reopen.

I can reproduce it very easily, both in Emacs 26 and 27.  I wonder how
come you couldn't.

I don't think it's a bug, though: that's how character echoing works
in Emacs.  It is even kinda-documented in the ELisp manual, under
read-event.

I've reopened the bug, but if people agree this is established and
documented (albeit perhaps surprising) behavior, I think it should be
closed as wontfix.

Thanks.

Message #18 received at 15012 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: bobnewell <at> bobnewell.net, 15012 <at> debbugs.gnu.org
Subject: Re: bug#15012: 23.3; read-char inappropriate echo area content
Date: Thu, 15 Aug 2019 09:01:26 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

> I can reproduce it very easily, both in Emacs 26 and 27.  I wonder how
> come you couldn't.

Me too.  If I do M-: (read-char) in this Emacs, the echo area remains
empty.  If I start a new Emacs and do the same, the echo area says
"M-:-", so... something I have eval-ed in this session has changed the
behaviour?  `read-char' still points to the built-in function...

> I don't think it's a bug, though: that's how character echoing works
> in Emacs.  It is even kinda-documented in the ELisp manual, under
> read-event.
>
> I've reopened the bug, but if people agree this is established and
> documented (albeit perhaps surprising) behavior, I think it should be
> closed as wontfix.

I think this behaviour should be noted in the doc string, at least.  The
only thing it says about PROMPT is

--
If the optional argument PROMPT is non-nil, display that as a prompt.
--

and noting the nil/"" behaviour should be simple enough.  (I guess the
changes should be to the doc strings of
read-event/read-char/read-char-exclusive.)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #21 received at 15012 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> suse.de>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: bobnewell <at> bobnewell.net, 15012 <at> debbugs.gnu.org,
 Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#15012: 23.3; read-char inappropriate echo area content
Date: Thu, 15 Aug 2019 18:11:23 +0200

On Aug 15 2019, Lars Ingebrigtsen <larsi <at> gnus.org> wrote:

> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>> I can reproduce it very easily, both in Emacs 26 and 27.  I wonder how
>> come you couldn't.
>
> Me too.  If I do M-: (read-char) in this Emacs, the echo area remains
> empty.  If I start a new Emacs and do the same, the echo area says
> "M-:-", so... something I have eval-ed in this session has changed the
> behaviour?  `read-char' still points to the built-in function...

Did you modify echo-keystrokes?

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab <at> suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

Message #24 received at 15012 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Andreas Schwab <schwab <at> suse.de>
Cc: bobnewell <at> bobnewell.net, 15012 <at> debbugs.gnu.org,
 Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#15012: 23.3; read-char inappropriate echo area content
Date: Thu, 15 Aug 2019 09:14:27 -0700

Andreas Schwab <schwab <at> suse.de> writes:

> Did you modify echo-keystrokes?

Doesn't seem like it:

echo-keystrokes is a variable defined in ‘keyboard.c’.
Its value is 1

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #27 received at 15012 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: bobnewell <at> bobnewell.net, 15012 <at> debbugs.gnu.org
Subject: Re: bug#15012: 23.3; read-char inappropriate echo area content
Date: Thu, 15 Aug 2019 19:24:39 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: bobnewell <at> bobnewell.net,  15012 <at> debbugs.gnu.org
> Date: Thu, 15 Aug 2019 09:01:26 -0700
> 
> I think this behaviour should be noted in the doc string, at least.

Fine with me.

Message #32 received at 15012-done <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: bobnewell <at> bobnewell.net, 15012-done <at> debbugs.gnu.org
Subject: Re: bug#15012: 23.3; read-char inappropriate echo area content
Date: Thu, 15 Aug 2019 15:12:45 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Lars Ingebrigtsen <larsi <at> gnus.org>
>> Cc: bobnewell <at> bobnewell.net,  15012 <at> debbugs.gnu.org
>> Date: Thu, 15 Aug 2019 09:01:26 -0700
>> 
>> I think this behaviour should be noted in the doc string, at least.
>
> Fine with me.

OK; done.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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