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

[Chet Ramey]

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On 8/26/15 10:16 PM, Mike Frysinger wrote:
> 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 readli
ne
>>>   (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 ?

Sure, at some point I'll look at doing something, but the solution Dennis
and I provided will work today.

- -- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/
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