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Re: [PATCH v2] prompt: support generic non-visible regions

X-seq: zsh-workers 50474
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: Felipe Contreras <felipe.contreras@xxxxxxxxx>
Cc: zsh-workers@xxxxxxx
Subject: Re: [PATCH v2] prompt: support generic non-visible regions
Date: Sun, 14 Aug 2022 12:57:31 -0700
Archived-at: <https://zsh.org/workers/50474>
In-reply-to: <20220811230901.471640-1-felipe.contreras@gmail.com>
List-id: <zsh-workers.zsh.org>
References: <20220811230901.471640-1-felipe.contreras@gmail.com>

On Thu, Aug 11, 2022 at 4:09 PM Felipe Contreras
<felipe.contreras@xxxxxxxxx> wrote:
>
> readline uses \001 (start of header) and \002 (start of text) as markers
> to delimit a non-visible character zone, which are necessary to
> calculate the width of a prompt.

How does one embed a literal ctrl-A or ctrl-B in the prompt?  I
haven't found any readline documentation that explains the use of
"start of header" or "start of text".

In zsh, should an extra digit immediately following \001 be treated as
a "glitch" width?

I'm also leaning to the opinion that \001 and \002 should only be
recognized when PROMPT_PERCENT is unset.

Follow-Ups:
- Re: [PATCH v2] prompt: support generic non-visible regions
  - From: Felipe Contreras

References:
- [PATCH v2] prompt: support generic non-visible regions
  - From: Felipe Contreras

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