GNU bug report logs - #16327
24.3; Arrow keys not working in virtual terminal after key binding

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

From: Yi Wang <tririverwangyi <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; Arrow keys not working in virtual terminal after key binding
Date: Thu, 2 Jan 2014 16:58:28 +0000

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

In a virtual terminal (i.e. the terminal without X, the one after
pressing, say C-M-F1), if the following code is evaluated, arrow keys no
longer work correctly. The 4 arrow keys becomes ABCD.

(global-set-key (kbd "M-[") '(lambda ()   (interactive) (other-window -1) ))

Note:

(1) This bug is reproducible with emacs -nw --no-init
(2) Under a X-environment terminal, say konsole, there is no problem.

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For information about debugging Emacs, please read the file
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In GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.8.2)
 of 2013-08-06 on -mnt-storage-buildroots-staging-x86_64-eric
Windowing system distributor `The X.Org Foundation', version 11.0.11405000
System Description: Arch Linux

Configured using:
 `configure '--prefix=/usr' '--sysconfdir=/etc' '--libexecdir=/usr/lib'
 '--localstatedir=/var' '--with-x-toolkit=gtk3' '--with-xft'
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector
 --param=ssp-buffer-size=4'
 'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

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

Major mode: Org

Minor modes in effect:
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  yas-global-mode: t
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Recent input:
<next> <next> <next> <next> <next> <next> <prior> <prior>
<prior> <prior> <prior> <prior> <prior> <next> <next>
<next> <prior> <prior> <prior> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <left>
<kp-enter> M-r C-x C-c M-x e <backspace> r e p SPC
o SPC r SPC e SPC b SPC <return>

Recent messages:
Source file `/home/wangyi/.emacs.d/elpa/org-20131028/org-bbdb.el' newer
than byte-compiled file
Source file `/home/wangyi/.emacs.d/elpa/org-20131028/org-gnus.el' newer
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Source file `/home/wangyi/.emacs.d/elpa/org-20131028/org-irc.el' newer than
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Source file `/home/wangyi/.emacs.d/elpa/org-20131028/org-rmail.el' newer
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Starting new Ispell process [aspell::en] ...
scroll-up-command: End of buffer [2 times]
scroll-down-command: Beginning of buffer [3 times]
goto-line [2 times]
(No files need saving)
Making completion list... [2 times]

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[Message part 2 (text/html, inline)]

Message #8 received at 16327 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Yi Wang <tririverwangyi <at> gmail.com>
Cc: 16327 <at> debbugs.gnu.org
Subject: Re: bug#16327: 24.3;
 Arrow keys not working in virtual terminal after key binding
Date: Thu, 02 Jan 2014 15:02:00 -0500

> (global-set-key (kbd "M-[") '(lambda ()   (interactive) (other-window -1) ))

Don't quote your lambdas, please!

As for your problem: (kbd "M-[") is the same as ESC [ which is
a sequence of bytes often used by the escape sequences of arrow
keys, so your binding will indeed conflict, tho it will depend on the
specific terminal emulator used.


        Stefan

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