lcd wrote:
> Copied to vim_dev, now with 100% more content. :)
>
> /lcd
>
> ----- Forwarded message from LCD 47 <[email protected]> -----
>
> From: LCD 47 <[email protected]>
> Date: Thu, 20 Feb 2014 15:06:53 +0200
> To: [email protected]
> Subject: Re: errorformat/cexpr bug?
>
> On 19 February 2014, Aaron Bohannon <[email protected]> wrote:
> > Over the years, I have wasted many hours of my life on trying to write
> > errorformat patterns -- and many times having to give up in defeat.
> > Now, finally, I've managed to trace down a behavior that could explain
> > all those hours of frustration.
> >
> > The meaning of the errorformat option is so arcane, though, that
> > I cannot know for sure whether this is actually a bug in the
> > implementation or simply the intended behavior. If it's intentional,
> > can someone *please* explain to me why it works like this?
> >
> > :echo string(&efm)
> >
> > '%+CXXX,%+EERROR,%+IINFO,%-GYYY'
> >
> > :cgetexpr ['INFO', 'ERROR', 'XXX']
> > :echomsg string(getqflist()[0].text) string(getqflist()[1].text)
> >
> > 'INFO' 'ERROR^@XXX'
> >
> > :cgetexpr ['INFO', 'YYY', 'ERROR', 'XXX']
> > :echomsg string(getqflist()[0].text) string(getqflist()[1].text)
> >
> > 'INFO' 'ERROR'
>
> Yeah, this one looks like a bug. What seems o be going on here is
> that 'YYY' matches '%-GYYY', which sets the multiignore flag, which
> doesn't get reset until 'XXX' is seen. Which basically means 'XXX' is
> matched as '%-CXXX', thus ignored.
>
> > :cgetexpr ['INFO', 'YYY', 'ZZZ', 'ERROR', 'XXX']
> > :echomsg string(getqflist()[0].text) string(getqflist()[1].text)
> > string(getqflist()[2].text)
> >
> > 'INFO' 'ZZZ' 'ERROR^@XXX'
>
> In this case multiignore gets set at 'YYY', but then gets reset
> when 'ZZZ' is seen. Thus the subsequent 'XXX' is correctly matched as
> '%+CXXX'.
>
> The patch below seems to fix the problem for this particular case,
> but the context is pretty involved. F.i. what about O/P/Q? It would be
> a good idea to have more pairs of eyes look at it.
It would also be good to have tests. test 10 already does some, but not
much.
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The Quest for the Holy Grail (Monty Python)
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