Re: [PATCH] _rl_untranslate_macro_value with meta control chars

[G. Branden Robinson]

Hi Grisha,

At 2023-08-03T06:24:25-0400, Grisha Levit wrote:
> When printing a macro, any character with the 8th bit set will be
> printed as `\M-' followed by the literal "unmetafied" character, even
> if the latter is a control character:
> 
> $ bind '"_": "\201"'; bind -s | cat -v
> "_": "\M-^A"
> 
> Or is a null byte:
> 
> $ bind '"1PI": "π"'; bind -s
> "1PI": "\M-O\M-"
> 
> $ bind '"2PI": "ππ"'; bind -s
> "2PI": "\M-O\M-"

I think the canonical way to represent a null byte (or, in this case, a
null bit septet within a byte) with this notation is ^@.  And that is in
fact what I see.

$ bash --version | head -n 1
GNU bash, version 5.1.4(1)-release (x86_64-pc-linux-gnu)
$ bind '"1PI": "π"'; bind '"2PI": "ππ"'; bind '"_": "\201"'; \
> bind -s | cat -v
"1PI": "M-OM-^@"
"2PI": "M-OM-^@M-OM-^@"
"_": "M-^A"

Regards,
Branden

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