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Re: Shortened bit branch in prompt

X-seq: zsh-users 26504
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: dominik.vogt@xxxxxx, Zsh Users <zsh-users@xxxxxxx>
Subject: Re: Shortened bit branch in prompt
Date: Wed, 10 Feb 2021 17:43:08 -0800
Archived-at: <https://zsh.org/users/26504>
Archived-at: <http://www.zsh.org/sympa/arcsearch_id/zsh-users/2021-02/CAH%2Bw%3D7aKskZrDo8hFk8AM-FUWHBtgtkwQnbeCtnKv%2BsZyeFa%3Dw%40mail.gmail.com>
In-reply-to: <20210210120501.GA3727@gmx.de>
List-id: <zsh-users.zsh.org>
References: <20210210120501.GA3727@gmx.de>

On Wed, Feb 10, 2021 at 4:05 AM Dominik Vogt <dominik.vogt@xxxxxx> wrote:
>
>  * If the branch name is max. 25 characters, print it umodified.
>  * If the branch ame is loger, print
>
>      <first 17 characters>...<last five characters>

Could you do this using the %> and %< prompt expansion escapes?

x=abcdefghijklmnopqrstuvwxyz0123456789
print -r -- ${(%):-%20>...>$x%>>%5<<$x%<<}

That still needs a conditional to determine (( $#x > 25 )).  Perhaps then:

setopt extendedglob
pat="(${(l:20::?:):-})?*(${(l:5::?:):-})"
print -r -- ${x/(#b)${~pat}/${match[1]}...${match[2]}}

I don't recall whether ${(*)...} to temporarily turn on extended
globbing is very common in the wild, yet.

References:
- Shortened bit branch in prompt
  - From: Dominik Vogt

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