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Re: Parameter operator P should probably strip \[ and \] characters

From: Torka Noda
Subject: Re: Parameter operator P should probably strip \[ and \] characters
Date: Mon, 27 Mar 2017 13:49:24 +0200

On Sat, 25 Mar 2017 15:16:31 -0400, Chet Ramey wrote:
> On 3/24/17 11:57 PM, Torka Noda wrote:
> > From what I understand, \[ and \] characters are only
> > useful for the prompts, right?  
> Yes, but one of the primary motivations for including the @P
> modifier was requests to be able to use prompt expansions
> when using `read -e -p'. In this case, you have to have the
> escape sequences preserved.

Oh, ok.

> > If so, then the parameter operator P should probably strip
> > them.  
> In general, you want the \[ and \] sequences expanded in all
> cases where the result will eventually be fed to readline,
> and stripped when it is not. It's not feasible for bash to
> figure that out for itself, so you have to tell it.  Since
> those escape sequences get stripped when bash isn't going to
> be doing line editing, you can put `set +o emacs +o vi' (or
> whichever one is relevant for you) before expanding a string
> using the @P modifier and get the results you want.

@p would strip \[ and \] characters, @P would not strip them? :)

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