Re: Read Prompt Width Miscalculation (Non-Printing Characters)

[Greg Wooledge]

On Wed, Dec 28, 2022 at 01:09:02PM -0600, The Administrator wrote:
> Hello and happy holiday hacking.  Does the read builtin stand to benefit
> from \[ and \] denotation ala $PS1 and friends?  Here is a quick example:
> 
> > read -erp "$( tput setaf 2 )NEW:$( tput sgr0 ) "
> 
> Fill the line with “0123456789ABCDEFGH” and try deleting some of it.  I have
> attached a small demonstration.

There's a (secret?) feature of readline that lets you do \[ \] type
stuff using 001 and 002 bytes instead.

x01=$'\x01' x02=$'\x02'
read -erp "$x01$(tput setaf 2)${x02}NEW:$x01$(tput sgr0)$x02 "

Not pretty, but it works.