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

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

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