Re: Macro aborts even though regexp instance exists - Serious Bug

[gnuist007@hotmail.com]

On Oct 23, 8:54 pm, Kevin Rodgers <kevin.d.rodg...@gmail.com> wrote:
> On 10/22/12 2:40 PM, Swami Tota Ram Shankar wrote:
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> > Hi emacs users,
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> > I write a simple macro which works, however, it fails in a particular
> > case.
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> > C-s
> > M-r
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> > to get into isearch-forward-regexp
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> > and give a regexp like
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> > ONE\|TWO
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> > It works for every TWO and ONE as long as there is a ONE ahead of TWO.
> > In the last instance, no ONE exists after TWO and it fails.
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> > \|<=>  OR or disjunction.
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> > Any solutions?
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> > This is such a fundamental issue that I think its a bug. When the C-s
> > M-r  is used outside the macro definition, the cursor gladly returns
> > to the original position when OR is entered and proceeds forward from
> > there, but perhaps, the macro aborts.
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> It is not a bug: when ONE fails to match the buffer, C-s (which is designed
> for interactive use, obviously) signals an error, which terminates the macro
> execution.
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> That's because there is no way for C-s to know that you _might_ type \|TWO
> after ONE.
>
> So the solution is to make sure that the regexp is not complete after ONE:
> C-s \(ONE\|TWO\)
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> > I guess, this can lead to a lot of confusion and time wastage, if the
> > user is unaware of this and most likely to neglect it because its
> > contrary to normal usage.
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> Yes, there is a lot of confusion and wasted time when a user is not aware
> of how to use a program.
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> > I include more newsgroups because of the seriousness of this bug.
>
> Whatever :-)
>
> --
> Kevin Rodgers
> Denver, Colorado, USA

thanks