GNU bug report logs - #966
keybinding involving Ctrl and Shift and letter

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Chong Yidong <cyd <at> stupidchicken.com>
Subject: bug#966: marked as done (keybinding involving Ctrl and Shift and 
 letter)

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Your message dated Wed, 17 Sep 2008 16:08:31 -0400
with message-id <87hc8eilhc.fsf <at> cyd.mit.edu>
and subject line keybinding involving Ctrl and Shift and letter
has caused the Emacs bug report #966,
regarding keybinding involving Ctrl and Shift and letter
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact don <at> donarmstrong.com
immediately.)


-- 
966: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=966
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: xah lee <xah <at> xahlee.org>
To: bug-gnu-emacs <at> gnu.org
Subject: keybinding involving Ctrl and Shift and letter
Date: Thu, 11 Sep 2008 20:46:22 -0700

This seems to be a bug.

i'm trying to set keybindings for both Ctrl+n and Ctrl+Shift+n, by:


(global-set-key (kbd "C-N") 'f1)
(global-set-key (kbd "C-n") 'f2)

however, that doesn't work.
Emacs will take both Ctrl+Shift+n and Ctrl+Shift+n to be whichever is  
evaluated last. In this case, f2.

But the following works:

(global-set-key (kbd "C-S-n") 'f1)
(global-set-key (kbd "C-n") 'f2)

This seems to contradict with Meta's ways. That is (kbd "M-N") works  
but not (kbd "M-S-n").

  Xah
∑ http://xahlee.org/

☄

In GNU Emacs 22.2.1 (powerpc-apple-darwin8.11.0, Carbon Version 1.6.0)
 of 2008-04-05 on g5.tokyo.stp.isas.jaxa.jp
Windowing system distributor `Apple Inc.', version 10.4.11
configured using `configure  '--prefix=/Applications/Emacs.app/ 
Contents/Resources' '--with-carbon' '--without-x' '--libexecdir=/ 
Volumes/Emacs/Emacs.app/Contents/MacOS/libexec' 'CFLAGS=-Os -arch  
i386 -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -DUSE_ATSUI - 
DUSE_MAC_TSM''

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: nil
  locale-coding-system: iso-8859-1
  default-enable-multibyte-characters: t



☄

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From: Chong Yidong <cyd <at> stupidchicken.com>
To: xah lee <xah <at> xahlee.org>
Cc: 966-done <at> debbugs.gnu.org
Subject: keybinding involving Ctrl and Shift and letter
Date: Wed, 17 Sep 2008 16:08:31 -0400

> i'm trying to set keybindings for both Ctrl+n and Ctrl+Shift+n, by:
>
> (global-set-key (kbd "C-N") 'f1)
> (global-set-key (kbd "C-n") 'f2)
>
> however, that doesn't work.
> Emacs will take both Ctrl+Shift+n and Ctrl+Shift+n to be whichever is  
> evaluated last. In this case, f2.
>
> But the following works:
>
> (global-set-key (kbd "C-S-n") 'f1)
> (global-set-key (kbd "C-n") 'f2)
>
> This seems to contradict with Meta's ways.

This is a legacy of ASCII.  Taking a look at an ASCII chart, you'll see
that ^A (control-a) through ^Z (control-z) map to ASCII codes 1 through
26, and these control keys are not case sensitive: control-a is
equivalent to control-A.

Emacs extends ASCII, which allows us to define things like C-] which are
not present in ASCII.  However, (kbd "C-N") and (kbd "C-n") still both
evaluate to ^N.

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