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Re: bug with multiline strings parsing and single-quoted !


From: Piotr Grzybowski
Subject: Re: bug with multiline strings parsing and single-quoted !
Date: Wed, 3 Dec 2014 10:47:22 +0100

On Wed, Dec 3, 2014 at 10:19 AM, Eduardo A. Bustamante López
<address@hidden> wrote:
> On Wed, Dec 03, 2014 at 08:57:26AM +0100, Piotr Grzybowski wrote:
>>  I think in this case, history_expand lib/readline/histexpand.c:905 is
>> invoked with hstring="b\" | echo '!'", and goes wrongly into history
>> expansion. [..]

> Yes, the issue is tricky, because you don't have access to the whole buffer
> there (shell_getc), just to the current line (shell_input_line), but the
> current line is a fragment of the whole command.
>
> What I don't understand is why bash does history expansion inside shell_getc,
> shouldn't it be easier to do it once you have the whole thing?
>
> It seems hard to change that, though.

 Yeah. This is probably due to the fact that bash returns to the prompt.
 And I agree, that changing that would probably be more of a design
modification than just a bug fix.
 Fixing the loop in history_expand could also get tricky, which
probably can be done with more or less dirty hacks, involving passing
and checking a flag indicating that it is a continuation of the
command.

cheers,
pg



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