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Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=
From: |
Thomas Dickey |
Subject: |
Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I. |
Date: |
Sun, 8 May 2022 12:05:14 -0400 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
On Sun, May 08, 2022 at 12:09:53PM +0000, Alan Mackenzie wrote:
> Hello again, Thomas.
>
> On Thu, May 05, 2022 at 20:01:02 -0400, Thomas Dickey wrote:
> > On Thu, May 05, 2022 at 06:18:00PM +0000, Alan Mackenzie wrote:
> > > Hello, ncurses!
>
> > > I'm writing as a member of the Emacs development team.
>
> > > In the recent change from ncurses-6.2 to ncurses-6.3, the following
> > > change was make in the linux console terminfo:
>
> > > --- Infocmp-linux-6.2 2022-05-04 20:16:01.609557894 +0000
> > > +++ infocmp-linux-6.3 2022-05-04 20:09:02.046581014 +0000
> > > @@ -14,7 +14,7 @@
> > > home=\E[H, hpa=\E[%i%p1%dG, ht=^I, hts=\EH, ich=\E[%p1%d@,
> > > ich1=\E[@, il=\E[%p1%dL, il1=\E[L, ind=\n,
> > >
> > > initc=\E]P%p1%x%p2%{255}%*%{1000}%/%02x%p3%{255}%*%{1000}%/%02x%p4%{255}%*%{1000}%/%02x,
> > > - kb2=\E[G, kbs=^?, kcbt=\E[Z, kcub1=\E[D, kcud1=\E[B,
> > > + kb2=\E[G, kbs=^?, kcbt=\E^I, kcub1=\E[D, kcud1=\E[B,
> > > kcuf1=\E[C, kcuu1=\E[A, kdch1=\E[3~, kend=\E[4~, kf1=\E[[A,
> > > kf10=\E[21~, kf11=\E[23~, kf12=\E[24~, kf13=\E[25~,
> > > kf14=\E[26~, kf15=\E[28~, kf16=\E[29~, kf17=\E[31~,
>
> > > We now have kcbt=\E^I.
>
> > A bug report got me to verify this, and
> > shift-tab on the console appeared to send that sequence,
> > so I documented it in the terminal description.
>
> > Tracing changes to default keyboard configuration in Linux isn't
> > as "simple" as control-sequences, but see below (it's "kbd").
>
> > I don't see any that send \E[Z. Having the terminal description
> > list a key definition that no one uses isn't very useful.
> > (I'll allow for some keyboard differences -- who has a "clear" key? --
> > but shift-tab has been used for a long time).
>
> > Just to check:
> > Debian, Fedora, Mageia, OpenSUSE do this (send \E^I)
> > Arch, Slackware don't do this (I get just ^I)
>
> > I have a few others that I could check, but (CentOS and Scientific Linux)
> > those are either obsolete or derived from the ones that I listed.
>
> Just to say that fixing Emacs to work with kcbt=\E^I wasn't actually very
> difficult at all, and I've committed a patch to the Emacs repository with
> this fix.
>
> I think it's a shame that there has been this confusion between
> <shift>TAB and <alt>TAB over the decades. This has made things difficult
> for applications like Emacs, which use both of these.
>
> So my position now is that I no longer have a view on what the best
> setting for kcbt in the linux console terminfo entry is.
>
> [ .... ]
>
> > I suppose you could tell Emacs to ignore kcbt (termcap kB) for Linux.
>
> This is in effect what has been done.
sounds good - no better solution came to mind
> > non-Emacs users probably would like to use the key.
>
> Yes. ;-(
>
> Thank you very much for your time, and the additional background
> information, over the last few days.
no problem (report bugs)
--
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net
ftp://ftp.invisible-island.net
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- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., (continued)
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Alan Mackenzie, 2022/05/06
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Eli Zaretskii, 2022/05/06
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Alan Mackenzie, 2022/05/07
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Eli Zaretskii, 2022/05/07
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Alan Mackenzie, 2022/05/07
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Eli Zaretskii, 2022/05/07
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Alan Mackenzie, 2022/05/07
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Eli Zaretskii, 2022/05/07
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Richard Stallman, 2022/05/08
Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I., Alan Mackenzie, 2022/05/08
- Re: Emacs difficulties in linux console with ncurses-6.3 caused by kcbt=\E^I.,
Thomas Dickey <=