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Re: [feature request] parameter transformation to safely add strings to

From: Chet Ramey
Subject: Re: [feature request] parameter transformation to safely add strings to PS1, &c.
Date: Mon, 23 Aug 2021 11:51:41 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 8/22/21 5:11 PM, Emanuele Torre wrote:
> It would be nice to have a parameter transformation (e.g. "${par@p}")
> that expands $par to a string that will not be expanded by PS1, PS2, &c.

So you want it to be expanded at some point, but its value not subject to
any of the prompt string expansions (\a, \d, \t, and so on)?

> example:
>   tmp_var=$(blabla) # this variable will not exist when PS1 is expanded

This seemns to be the key requirement. Otherwise, you would be able to
simply write PS1="blabla \${tmp_var} blabla" as others have suggested.

I'm not sure that requires a new transformation (which would have to be
much more completely specified than it has been so far).

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

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