Re: [Help-bash] `read -e -p`, colors, and invisible chars

[Mike Frysinger]

On 26 Aug 2015 22:04, Chet Ramey wrote:
> On 8/26/15 9:01 PM, Mike Frysinger wrote:
> > my desire is simple:
> >   show a custom colorized prompt when reading input and leverage readline
> >   (for editing & history)
> > 
> > the `read` builtin almost gets me there:
> >  - the -p flag allows you to specify a custom prompt
> >  - the -e flag uses readline for input
> > 
> > however, the -p flag does not parse escape sequences.  np, just expand
> > that myself ahead of time using `printf %b`.  simple example:
> >   prompt=$(printf '%bfoo>%b ' '\033[1;33m' '\033[0m')
> >   read -e -p "${prompt}"
> > 
> > now i hit the classic invisible char problem when readline tries to
> > redraw the prompt (just hold up on the arrow key to draw many lines
> > from your history).  normally i'd leverage \[ and \], but bash does
> > not seem to support that w/the read builtin -- they get rendered in
> > the output directly instead of being consumed.
> >   $ prompt=$(printf '%bfoo>%b ' '\[\033[1;33m\]' '\[\033[0m\]')
> >   $ read -e -p "${prompt}"
> >   \[\]foo>\[\] 
> > (yes, moving the \[ and \] to the printf string yields same behavior)
> 
> https://lists.gnu.org/archive/html/bug-bash/2015-08/msg00025.html

so no interest in making -p easier to use ?

can we at least extend the read -p section in the man page ?
and add tips in the PROMPTING section ?
-mike

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