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bug#22272: 24.5; nonfunctional Emacs with a bad global mode (post-comman
From: |
brubar . cs |
Subject: |
bug#22272: 24.5; nonfunctional Emacs with a bad global mode (post-command-hook). |
Date: |
Wed, 30 Dec 2015 08:28:04 +0100 |
Hi,
This report is about a possible improvement. The "bug" arises only after
a programming mistake.
Please find attached a recipe to reproduce a stupid thing I've done.
I was trying to define a new global minor mode. I ended up placing a
function that raises an unhandled error in `post-command-hook'.
Then, I had to kill my Emacs; I found no other way to recover control.
As the `post-command-hook' documentation says, Emacs could probably
do better here by discarding my non-working code.
To reproduce and *KILL YOUR EMACS*, launch a *NEW* Emacs like that:
emacs -Q --load test-kill-your-emacs-with-global-mode.el A-NEW-FILE.txt
--eval '(insert "modified")' --funcall BAD-global-mode
I'm reporting this only to improve Emacs. I obviously fixed my code and
Emacs is awesome again!
Thanks,
Bruno.
In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.14.9)
of 2015-09-22 on tosh-laptop
Windowing system distributor `The X.Org Foundation', version 11.0.11704000
Configured using:
`configure --prefix=/usr --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --mandir=/usr/share/man
--infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
--localstatedir=/var/lib --disable-dependency-tracking
--disable-silent-rules --libdir=/usr/lib64 --program-suffix=-emacs-24
--infodir=/usr/share/info/emacs-24 --localstatedir=/var
--enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
--with-gameuser=:gamestat --without-compress-install
--with-file-notification=inotify --enable-acl --with-dbus
--without-gnutls --without-gpm --without-hesiod --without-kerberos
--without-kerberos5 --with-xml2 --without-selinux --without-wide-int
--with-zlib --with-sound=alsa --with-x --without-ns --without-gconf
--without-gsettings --without-toolkit-scroll-bars --without-gif
--with-jpeg --with-png --with-rsvg --without-tiff --with-xpm
--with-imagemagick --with-xft --without-libotf --without-m17n-flt
--with-x-toolkit=gtk3 GENTOO_PACKAGE=app-editors/emacs-24.5 'CFLAGS=-O2
-pipe -march=native' CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''
Important settings:
value of $LC_CTYPE: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Emacs-Lisp
Minor modes in effect:
tooltip-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-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
line-number-mode: t
transient-mark-mode: t
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...
Load-path shadows:
None found.
Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
help-fns mail-prsvr mail-utils help-mode easymenu time-date tooltip
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple
abbrev minibuffer 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 make-network-process
dbusbind inotify dynamic-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)
Memory information:
((conses 16 73069 6963)
(symbols 48 17625 0)
(miscs 40 44 138)
(strings 32 9420 4003)
(string-bytes 1 259885)
(vectors 16 8991)
(vector-slots 8 384143 17302)
(floats 8 64 195)
(intervals 56 372 4)
(buffers 960 13)
(heap 1024 36263 750))
===File
~/WorkingDirectory/Community/Emacs/Gnu-Emacs/test-kill-your-emacs-with-global-mode.el===
;; WARNING WARNING WARNING WARNING
;;
;; Make your Emacs *UNUSABLE*
;;
;; WARNING WARNING WARNING WARNING
;;
;; BUG report: nonfunctional Emacs with a bad global mode (post-command-hook).
;;
;; What follows is a recipe to reproduce a stupid thing I've done.
;; The problem is that I had to kill my emacs; I found no other way to
;; recover control.
;;
;; The following code reproduces the problem: it ends up placing a
;; function that raises an unhandled error in `post-command-hook'.
;;
;; As the `post-command-hook' documentation says, Emacs could probably
;; do better here by discarding my stupid code.
;;
;; Do not use like this:
;;
;; emacs -Q --load test-kill-your-emacs-with-global-mode.el A-NEW-FILE.txt
--eval '(insert "modified")' --funcall BAD-global-mode
;;
;;
;;
(define-minor-mode BAD-minor-mode
"BAD minor mode."
)
(define-globalized-minor-mode BAD-global-mode
BAD-minor-mode
identity
"BAD global mode."
)
============================================================
- bug#22272: 24.5; nonfunctional Emacs with a bad global mode (post-command-hook).,
brubar . cs <=