GNU bug report logs - #32555
26.1; Async command buffer navigation bug

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

From: Live System User <nyc4bos <at> aol.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; Async command buffer navigation bug
Date: Tue, 28 Aug 2018 04:27:23 -0400

Hi,

        After an `async-shell-command' finished, I tried to
        navigate its buffer with the arrow-keys and got the
        following:

Debugger entered--Lisp error: (wrong-type-argument processp nil)
  process-mark(nil)
  comint-after-pmark-p()
  (if (comint-after-pmark-p) (comint-previous-input 1) (previous-line 1))
  (lambda nil (interactive) (if (comint-after-pmark-p) (comint-previous-input 1) (previous-line 1)))()
  funcall-interactively((lambda nil (interactive) (if (comint-after-pmark-p) (comint-previous-input 1) (previous-line 1))))
  call-interactively((lambda nil (interactive) (if (comint-after-pmark-p) (comint-previous-input 1) (previous-line 1))) nil nil)
  command-execute((lambda nil (interactive) (if (comint-after-pmark-p) (comint-previous-input 1) (previous-line 1))))


  Thanks.




In GNU Emacs 26.1 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.20.6)
 of 2018-06-26 built on localhost.localdomain
Windowing system distributor 'Fedora Project', version 11.0.11803000
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...

Configured using:
 'configure 'CFLAGS=-DMAIL_USE_LOCKF -O0 -ggdb3 -pipe -Wall
 -Werror=format-security -fexceptions -fstack-protector-strong
 --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic'
 LDFLAGS=-Wl,-z,relro
 --prefix=/tmp/emacs-26.1 --with-dbus
 --with-gif --with-jpeg --with-png --with-rsvg --with-lcms2 --with-tiff
 --with-xft --with-xpm --with-x-toolkit=gtk3 --with-gpm=yes
 --with-xwidgets --with-modules'

Configured features:
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ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
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Major mode: Lisp Interaction

Minor modes in effect:
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Load-path shadows:
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Message #8 received at 32555 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Live System User <nyc4bos <at> aol.com>
Cc: 32555 <at> debbugs.gnu.org
Subject: Re: bug#32555: 26.1; Async command buffer navigation bug
Date: Tue, 28 Aug 2018 08:29:18 -0400

tags 32555 + unreproducible
quit

Live System User <nyc4bos <at> aol.com> writes:

>         After an `async-shell-command' finished, I tried to
>         navigate its buffer with the arrow-keys and got the
>         following:
>
> Debugger entered--Lisp error: (wrong-type-argument processp nil)
[...]
>   command-execute((lambda nil (interactive) (if (comint-after-pmark-p) (comint-previous-input 1) (previous-line 1))))

It looks like you've bound the arrow-keys to some command which causes
this error.  I don't see any similar command in Emacs sources (and I
don't get such an error in 'emacs -Q' with the normal arrow-key
commands).

Message #13 received at 32555 <at> debbugs.gnu.org (full text, mbox):

From: Live System User <nyc4bos <at> aol.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32555 <at> debbugs.gnu.org
Subject: Re: bug#32555: 26.1; Async command buffer navigation bug
Date: Tue, 28 Aug 2018 16:25:10 -0400

Noam Postavsky <npostavs <at> gmail.com> writes:

> tags 32555 + unreproducible
> quit
>
> Live System User <nyc4bos <at> aol.com> writes:
>
>>         After an `async-shell-command' finished, I tried to
>>         navigate its buffer with the arrow-keys and got the
>>         following:
>>
>> Debugger entered--Lisp error: (wrong-type-argument processp nil)
> [...]
>>   command-execute((lambda nil (interactive) (if (comint-after-pmark-p) (comint-previous-input 1) (previous-line 1))))
>
> It looks like you've bound the arrow-keys to some command which causes
> this error.  I don't see any similar command in Emacs sources (and I
> don't get such an error in 'emacs -Q' with the normal arrow-key
> commands).

   Sorry, there was a shell-mode-hook:

(add-hook 'shell-mode-hook
          '(lambda ()
             (local-set-key [home]        ; move to beginning of line, after pro
mpt
                            'comint-bol)
             (local-set-key [up]          ; cycle backward through command histo
ry
                            '(lambda () (interactive)
                               (if (comint-after-pmark-p)
                                   (comint-previous-input 1)
                                 (previous-line 1))))
             (local-set-key [down]        ; cycle forward through command histor
y
                            '(lambda () (interactive)
                               (if (comint-after-pmark-p)
                                   (comint-next-input 1)
                                 (forward-line 1))))
             ))



    Is tnere a way to acnieve the navigation I seek?

    I've never had issues with this code before.

    Thanks.

Message #16 received at 32555 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Live System User <nyc4bos <at> aol.com>
Cc: 32555 <at> debbugs.gnu.org
Subject: Re: bug#32555: 26.1; Async command buffer navigation bug
Date: Tue, 28 Aug 2018 18:44:10 -0400

tags 32555 = fixed
merge 32555 11224
close 32555 27.1
quit

Live System User <nyc4bos <at> aol.com> writes:

> (add-hook 'shell-mode-hook

>              (local-set-key [up]          ; cycle backward through command history
>                             '(lambda () (interactive)
>                                (if (comint-after-pmark-p)
>                                    (comint-previous-input 1)
>                                  (previous-line 1))))

>     I've never had issues with this code before.

That seems surprising since this problem is only fixed on the master
branch since February.

[1: aaeb101d89]: 2018-02-10 23:46:13 +0200
  * lisp/comint.el (comint-after-pmark-p): Check if buffer has a live process.
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=aaeb101d899a09e18630466c348041a172cd5d91

Message #25 received at 32555 <at> debbugs.gnu.org (full text, mbox):

From: Live System User <nyc4bos <at> aol.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32555 <at> debbugs.gnu.org
Subject: Re: bug#32555: 26.1; Async command buffer navigation bug
Date: Wed, 29 Aug 2018 13:00:41 -0400

Noam Postavsky <npostavs <at> gmail.com> writes:

> tags 32555 = fixed
> merge 32555 11224
> close 32555 27.1
> quit
>
> Live System User <nyc4bos <at> aol.com> writes:
>
>> (add-hook 'shell-mode-hook
>
>>              (local-set-key [up]          ; cycle backward through command history
>>                             '(lambda () (interactive)
>>                                (if (comint-after-pmark-p)
>>                                    (comint-previous-input 1)
>>                                  (previous-line 1))))
>
>>     I've never had issues with this code before.
>
> That seems surprising since this problem is only fixed on the master
> branch since February.
>
> [1: aaeb101d89]: 2018-02-10 23:46:13 +0200
>   * lisp/comint.el (comint-after-pmark-p): Check if buffer has a live process.
>   https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=aaeb101d899a09e18630466c348041a172cd5d91

    Thanks for your  research.

    I have been switching back and forth between Emacs versions
    and it is possinle I got this error when not running master.

    I no longer have that session running so I can't double-check.

    I do see that it is working in a new Emacs session running
    master that was built today...

   Its mode-line contains:

          (Shell:no process Shell-Compile)

    Thanks.

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