GNU bug report logs - #42045
27.0.91; display-format-alist for X11 does not recognize DISPLAY with IPv6 literal

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

From: Valtteri Vuorikoski <vuori <at> notcom.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.91; display-format-alist for X11 does not recognize DISPLAY
 with IPv6 literal
Date: Thu, 25 Jun 2020 22:20:05 +0300

If the DISPLAY environment variable is to an IPv6 literal such as
[::1]:1, the regexp that x-win.el adds to the display-format-alist to
recognize X11 does not match, which results in breakage.

x-win.el should probably add a second regexp to the alist, such as:
(add-to-list 'display-format-alist '("\\`\\[[^]]*\\]:[0-9]+\\(\\.[0-9]+\\)?\\'" . x))

Steps to repeat:

1. Run (window-system-for-display "[::1]:1").
2. Note that it returns nil instead of 'x.



In GNU Emacs 27.0.91 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo version 1.15.10)
 of 2020-06-24 built on workbuntu2
Repository revision: 632b0119e1ac0b907af41e4e4b7b5ab7557a5d90
Repository branch: emacs-27
Windowing system distributor 'HC-Consult', version 11.0.12008001
System Description: Ubuntu 18.04.4 LTS

Recent messages:
Loading /home/vuori/.emacs.local.d/local-init.el (source)...done
Battery status not available
Waiting for git... [2 times]
uncompressing x-win.el.gz...done
uncompressing frame.el.gz...done
Can’t guess python-indent-offset, using defaults: 4
Error during redisplay: (jit-lock-function 525) signaled (end-of-buffer)
Wrote /home/vuori/.emacs.local.d/desktop/.emacs.desktop.lock
Desktop: 2 frames, 20 buffers restored.
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --prefix=/usr/local/emacs --with-modules --with-cairo
 --with-imagemagick --with-x-toolkit=athena
 --without-toolkit-scroll-bars'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG CAIRO IMAGEMAGICK SOUND GPM DBUS
GSETTINGS GLIB NOTIFY INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ
M17N_FLT LIBOTF ZLIB LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

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/home/vuori/.emacs.d/elpa/org-20200615/org-loaddefs hides /usr/local/emacs/share/emacs/27.0.91/lisp/org/org-loaddefs
/home/vuori/.emacs.d/elpa/org-20200615/org-version hides /usr/local/emacs/share/emacs/27.0.91/lisp/org/org-version
/home/vuori/.emacs.d/elpa/org-20200615/org-install hides /usr/local/emacs/share/emacs/27.0.91/lisp/org/org-install
/home/vuori/.emacs.d/elpa/eldoc-1.0.0/eldoc hides /usr/local/emacs/share/emacs/27.0.91/lisp/emacs-lisp/eldoc

Features:
(shadow sort mail-extr emacsbug message rmc puny rfc822 mml mml-sec epa
derived epg epg-config gnus-util rmail rmail-loaddefs
text-property-search mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils winner helm-command helm-elisp helm-eval
edebug backtrace helm-info vc vc-dispatcher ccc prism face-remap
company-oddmuse company-keywords company-etags company-gtags
company-dabbrev-code company-dabbrev company-files company-cmake
company-xcode company-clang company-eclim company-template company-bbdb
flycheck-mypy flycheck jka-compr hi-lock vc-git diff-mode smartparens
highlight-thing thingatpt server hcl-mode windmove framemove which-key
narrow-indirect yasnippet highlight-indentation company-capf help-fns
radix-tree elpy elpy-rpc elpy-shell elpy-profile elpy-django
elpy-refactor python tramp-sh tramp tramp-loaddefs trampver
tramp-integration tramp-compat shell parse-time iso8601 ls-lisp ido grep
compile files-x etags fileloop generator xref project cus-edit pyvenv
eshell esh-cmd esh-ext esh-opt esh-proc esh-io esh-arg esh-module
esh-groups esh-util ws-butler dired+ image-dired image-mode exif
image-file dired-x dired-aux dired dired-loaddefs helm-org-rifle
org-clipper org-eww ob-python org ob ob-tangle ob-ref ob-lob ob-table
ob-exp org-macro org-footnote org-src ob-comint org-pcomplete pcomplete
comint ansi-color org-list org-faces org-entities time-date noutline
outline org-version ob-emacs-lisp ob-core ob-eval org-table ol org-keys
org-compat org-macs org-loaddefs find-func cal-menu calendar
cal-loaddefs tab-line ibuffer-vc ibuf-ext ibuffer ibuffer-loaddefs ivy
ring ivy-faces ivy-overlay colir color helm-mode helm-files helm-buffers
helm-occur helm-tags helm-locate helm-grep helm-regexp format-spec
helm-utils helm-help helm-types helm helm-source eieio-compat
helm-multi-match helm-lib helm-config helm-easymenu async-bytecomp async
company pcase delsel edmacro kmacro iso-transl
smart-mode-line-light-theme smart-mode-line rich-minority diminish
autorevert filenotify savehist desktop frameset memoize f dash s
cl-extra help-mode paren recentf tree-widget wid-edit battery cus-start
cus-load use-package use-package-ensure use-package-delight
use-package-diminish use-package-bind-key bind-key easy-mmode
use-package-core finder-inf advice rx info package easymenu browse-url
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json subr-x map url-vars seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting cairo x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 470751 146121)
 (symbols 48 36788 9)
 (strings 32 151488 20190)
 (string-bytes 1 4824461)
 (vectors 16 56962)
 (vector-slots 8 668767 98414)
 (floats 8 386 657)
 (intervals 56 2955 290)
 (buffers 1000 33))

Message #8 received at 42045 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Valtteri Vuorikoski <vuori <at> notcom.org>
Cc: 42045 <at> debbugs.gnu.org
Subject: Re: bug#42045: 27.0.91; display-format-alist for X11 does not
 recognize DISPLAY with IPv6 literal
Date: Tue, 01 Sep 2020 16:36:59 +0200

>>>>> On Thu, 25 Jun 2020 22:20:05 +0300, Valtteri Vuorikoski <vuori <at> notcom.org> said:

    Valtteri> If the DISPLAY environment variable is to an IPv6 literal such as
    Valtteri> [::1]:1, the regexp that x-win.el adds to the display-format-alist to
    Valtteri> recognize X11 does not match, which results in breakage.

    Valtteri> x-win.el should probably add a second regexp to the alist, such as:
    Valtteri> (add-to-list 'display-format-alist '("\\`\\[[^]]*\\]:[0-9]+\\(\\.[0-9]+\\)?\\'" . x))

That regexp won't work, since now youʼre requiring the '[' and ']' to
be present.

"\\`\\[?[^]]*\\]?:[0-9]+\\(\\.[0-9]+\\)?\\'" would fix that, but since
we donʼt really care what comes before the ':', so would

"\\`.*:[0-9]+\\(\\.[0-9]+\\)?\\'"

Robert

Message #11 received at 42045 <at> debbugs.gnu.org (full text, mbox):

From: Valtteri Vuorikoski <vuori <at> notcom.org>
To: 42045 <at> debbugs.gnu.org
Subject: Re: bug#42045: 27.0.91; display-format-alist for X11 does not
 recognize DISPLAY with IPv6 literal
Date: Thu, 3 Sep 2020 12:39:48 +0300

On 9/1/20 5:36 PM, Robert Pluim wrote:
>>>>>> On Thu, 25 Jun 2020 22:20:05 +0300, Valtteri Vuorikoski <vuori <at> notcom.org> said:
> 
>      Valtteri> If the DISPLAY environment variable is to an IPv6 literal such as
>      Valtteri> [::1]:1, the regexp that x-win.el adds to the display-format-alist to
>      Valtteri> recognize X11 does not match, which results in breakage.
> 
>      Valtteri> x-win.el should probably add a second regexp to the alist, such as:
>      Valtteri> (add-to-list 'display-format-alist '("\\`\\[[^]]*\\]:[0-9]+\\(\\.[0-9]+\\)?\\'" . x))
> 
> That regexp won't work, since now youʼre requiring the '[' and ']' to
> be present.
> 
> "\\`\\[?[^]]*\\]?:[0-9]+\\(\\.[0-9]+\\)?\\'" would fix that, but since
> we donʼt really care what comes before the ':', so would
> 
> "\\`.*:[0-9]+\\(\\.[0-9]+\\)?\\'"

Yes, note "second regexp": the current regexp would remain and match 
other types of hostnames/addresses. But if no one cares about the format 
of the host part, your version is simpler.

 -Valtteri

Message #14 received at 42045 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: Valtteri Vuorikoski <vuori <at> notcom.org>, 42045 <at> debbugs.gnu.org
Subject: Re: bug#42045: 27.0.91; display-format-alist for X11 does not
 recognize DISPLAY with IPv6 literal
Date: Sat, 12 Jun 2021 15:12:25 +0200

Robert Pluim <rpluim <at> gmail.com> writes:

> That regexp won't work, since now youʼre requiring the '[' and ']' to
> be present.
>
> "\\`\\[?[^]]*\\]?:[0-9]+\\(\\.[0-9]+\\)?\\'" would fix that, but since
> we donʼt really care what comes before the ':', so would
>
> "\\`.*:[0-9]+\\(\\.[0-9]+\\)?\\'"

I think that makes sense?  So I've pushed Robert's regexp to Emacs 28.

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

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