Re: obtain current visual selection

On Wednesday, February 11, 2015 at 11:58:24 AM UTC-6, Enno wrote:
> > Actually, the problem has nothing to do with the 'secure' option. Setting nosecure gives the same result, if I correct your mapping:
> >
> > xnoremap <expr> * "\<Esc>/".GetVis()."\<CR>"
> >
> > The problem is not 'secure' but rather the fact that you're using :normal inside an <expr> mapping. :help :map-<expr> says:
> >
> > > Be very careful about side effects! The expression is evaluated while
> > > obtaining characters, you may very well make the command dysfunctional.
> > > For this reason the following is blocked:
> > > - Changing the buffer text |textlock|.
> > > - Editing another buffer.
> > > - The |:normal| command.
> >
> > This alternate mapping works fine (although it is admittedly not as elegant):
> >
> > xnoremap * <Esc>/<C-R>=GetVis()<CR><CR>
>
> Yeah,
>
> I thought that too, almost. That's where the deleted message above comes from.
>
> However, then I found out that it is rather the place of definition of GetVis().
>
> The mapping
>
> xnoremap <expr> * '/'.grep#GetVis() . '<CR>'
>
> still gives, once `viw*` is hit the error message
>
> Error detected while processing function grep#GetVis:
> line 2:
> E523: Not allowed here
>
> as long as you use grep#GetVis() defined in ~/.vim/autoload/grep.vim
> and NOT a global function GetVis().

Yes, because as I said, ":normal" is not allowed in any <expr> mapping.

In what way does it depend on using an autoload function?

Using :normal in an expression mapping should *always* fail, regardless of the 'secure' setting or function definition.

Use the expression-register method instead, and it should work fine.

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