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Re: Bug: bind -u shell-backward-word does not unbind the binding

From: Chet Ramey
Subject: Re: Bug: bind -u shell-backward-word does not unbind the binding
Date: Thu, 27 Feb 2020 14:19:51 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 2/27/20 8:40 AM, address@hidden wrote:
> --text follows this line--
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Description:
>       It is possible to bind shell-backward-word, but not possible to unbind.
>  Bash Version: 5.0
>  Patch Level: 16
>  Release Status: release
> Repeat-By:
>         1) bind '"\e\C-b": shell-backward-word' # make binding
>         2) bind -P # to check that the binding appeared
>         3) bind -u shell-backward-word # to unbind the binding
>         4) bind -P # to check that unbinding didn't work
> Fix:
>       I don't know how to fix the problem.

Well, it's maybe non-obvious. The binding string begins with ESC, which
is by default the meta-prefix for emacs mode. That means you do the key
binding in the `emacs-meta' keymap.

The `-u' option to bind operates on the default keymap, which in emacs
mode is `emacs'.

If you add the `-m emacs-meta' option to your `bind -u' command, you'll
get the results you want.

It might be better if the underlying readline function descended into
keymaps such as emacs-meta rather than operating on a single keymap, but
it doesn't do that right now.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/

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