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weirdness with no-break space, fset and defun
From: |
Toomas Rosin |
Subject: |
weirdness with no-break space, fset and defun |
Date: |
Sun, 02 Aug 2015 13:10:39 +0300 |
Good <insert your local time of day here>!
I have a text file in which I want to occasionally overwrite regular
spaces (<U0020>, #x20) with UTF-8 no-break spaces (<U00A0>). Trying to
define a shortcut key for this (C-c SPC, which is a lot easier to type
frequently than C-x 8 SPC), I ran into a bit of trouble. I got it right
finally, but am still puzzled about why my first attempts failed.
When I do
M-: (fset SPC 'insert-no-break-space SPC " C-x 8 SPC ") RET
M-x insert-no-break-space RET
, the result depends on where the point is located. After a regular
space (#0x20), this command has absolutely no effect; elsewhere it
inserts a *regular* (instead of no-break) space, *without overwriting
the next character* in overwrite mode!
When I do, instead,
M-: (defun SPC insert-no-break-space SPC () SPC (interactive) SPC (insert
SPC " C-x 8 SPC ")) RET
M-x insert-no-break-space RET
, the command inserts a no-break space all right, but still does not
overwrite the next character in overwrite mode.
(I did these experiments first in a regular Emacs session, but the same
happened with "LANG=C emacs --no-init". I have Emacs 24.4.1, a fairly
regular build: "--prefix=/usr --with-gif=no --localstatedir=/var", with
X libraries.)
The method I arrived at at last is the following:
M-: (fset SPC 'insert-no-break-space SPC " C-q C-x 8 SPC ") RET
(i.e. with C-q before C-x). This does exactly what I need.
I am confused. What's going on? Am I missing something I should know?
With best wishes,
T.
- weirdness with no-break space, fset and defun,
Toomas Rosin <=