Re: How to use matcharg(2)[1] to set search register?

On Jul 9, 10:50 am, Andy Wokula <anw...@yahoo.de> wrote:
> Am 09.07.2012 03:44, schrieb Gary Johnson:
>
>
>
>
>
> >>>> 9. Last search pattern register    "/                 *quote_/* *quote/*
> >>>> ...
> >>>> "Note that the valued is restored when returning from a function"
>
> >>>> --And--
>
> >>>> *function-search-undo*
> >>>> The last used search pattern and the redo command "."
> >>>> will not be changed by the function.  This also
> >>>> implies that the effect of |:nohlsearch| is undone
> >>>> when the function returns.
>
> >>>> BUT...
>
> >      function! MyTest()
> >        let @/='world'
> >      endfunction
>
> > and after calling MyTest(), the '/' register contains "world".
>
> > However, if I change the function to this:
>
> >      function! MyTest()
> >        /match
> >        echo @/
> >      endfunction
>
> > and call it, the cursor moves to the next occurrence of "match" in
> > the file and the string "match" is echoed to the command line, but
> > executing ':echo @/' displays "hello".
>
> > So it appears that setting the '/' register indirectly alters a
> > local copy, but setting it directly with :let also alters the global
> > copy.  I think that's a bug.
>
> > The results were the same on versions 7.2.330 and 7.3.584, so it has
> > been like this for a while.
>
> ... also checked with 7.0 and 6.4 -- same results.
>
> I'd say please don't declare this a bug, rather update the help.
>
> e.g. how would you otherwise clear the last search pattern
>      :let @/ = ""
> from within a function?  (maybe not the best example)
>
> Usually, when you assign to @/, you're supposed to know what you are
> doing.  OTOH, when doing a range command :/pat/  or :substitute or :global
> etc. you might not think about side effects, that's what search-undo is for.
>
> Plugins like :LogiPat assign to @/ within a function ().
>
> Just to mention it, there is also a search-undo for autocmds.
>
> --
> Andy

I agree with Andy, I would not call it a program bug, but a need to
clarify the help.

I like the fact that it is NOT reset on leaving a function.

Bill

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