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viper-mode: viper-replace-char-subr


From: Olaf Dietrich
Subject: viper-mode: viper-replace-char-subr
Date: Mon, 02 May 2005 09:36:57 +0200

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In GNU Emacs 21.4.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2005-04-20 on gracvn
configured using `configure  --prefix=/var/autofs/misc/apps/DIR/emacs-21.4'
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: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


This may be a bug of viper-mode:

Inserting a new line break in an existing line by "r <Return>"
(more exactly: replacing the current character by a newline)
does not work; instead, '^M' appears as replacement text.

(The alternative "r C-j" _does_ work, but is not what my fingers
are used to do in vi.)

It seems that the function

| (defun viper-replace-char-subr (com arg)
|   (let ((inhibit-quit t)
|         char)
|     (viper-set-complex-command-for-undo)
|     (or (eq viper-intermediate-command 'viper-repeat)
|         (viper-special-read-and-insert-char))
|
|       (if (eq char ?\C-m) (setq char ?\n))
|
|       (delete-char 1 t)
|
|       (setq char (if com viper-d-char (viper-char-at-pos 'backward)))
|       (if com (insert char))
|
|       (setq viper-d-char char)
|
|       (viper-loop (1- (if (> arg 0) arg (- arg)))
|                   (delete-char 1 t)
|                   (insert char))
|
|       (viper-adjust-undo)
|       (backward-char arg)
|       ))

should avoid this, see in particular the line

|       (if (eq char ?\C-m) (setq char ?\n))

but this doesn't work. In a Usenet discussion
(e.g., Message-ID: <address@hidden>
and <address@hidden>)
in gnu.emacs.help, Kevin Rodgers remarked about this:

: The first problem is that the (if (eq char ?\C-m) (setq char ?\n)) form
: occurs before char has been set.  The second problem is that when that
: form is evaluated and char is reset, it has already been inserted; but
: no attempt is made to undo that and re-insert the proper newline
: character.

Olaf


Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <menu-bar> <help-menu> <report-emacs-bug>

Recent messages:
(emacs 
/var/autofs/misc/apps/DIR/emacs-21.4/share/emacs/21.4/lisp/emulation/viper-cmd.el)
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