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Re: Suggestion for terminal package maintainers
On Jun 2 17:47, Corinna Vinschen wrote:
> On Jun 2 11:39, Christopher Faylor wrote:
> > On Tue, Jun 02, 2009 at 05:33:27PM +0200, Corinna Vinschen wrote:
> > >Maybe it is, that's why I'm asking. But, if we do that, shouldn't
> > >Ctrl-Backspace return ^H as in xterm? So far the Cygwin console
> > >returned ^H without and ^? with Ctrl, now it returns ^? in both
> > >variations.
> >
> > IMO, cygwin's console == linux console. On two of my systems (Fedora
> > and Gentoo) CTRL-Backspace returns Backspace on the console. Now that
> > I'm at work, I see that CTRL-Backspace returns ^H on my Ubuntu system.
> > But, so far, the CTRL-Backspace == Backspace contingent is winning.
>
> Uh, oh, hmm. I was always under the impression we try to be as xterm
> compatible as possible, rather than the Linux console.
I found a problem with this change. Tcsh's default keybinding for
^? is backward-delete-word, while ^H is bound to backward-delete-char.
So far it was possible to use Alt-Backspace to delete a word. This
doesn't work anymore since ^? is now mapped to backward-delete-char
due to the tty erase being set to ^?, and Alt-Backspace only returning
a NUL byte.
Using Alt-Backspace to delete a word works fine in the Linux console.
This means, the keymapping for Alt-Backspace does not return ^? but one
of the other character sequences bound to backward-delete-word:
tcsh$ bindkey | grep backward-delete-word
"^W" -> backward-delete-word
"\210" -> backward-delete-word
"\377" -> backward-delete-word
"^[^H" -> backward-delete-word
"^[^?" -> backward-delete-word
The problem is, for some reason the sequence generated by Alt-Backspace
is not visible in od output. Neither for the Linux console, nor in
xterm. Does anybody know the sequence? I failed to figure that out via
google.
Even not knowing the sequence returned by Alt-Backspace, AFAICS, the
right thing to do is to send either ^[^? or \377, dependent on the
setting of dev_state->metabit. That's how the META key is usually
defined and it brings back the old Alt-Backspace functionality to tcsh.
I checked my change in for now. If somebody thinks it's wrong and has
another solution, just speak up.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat