Re: obtain current visual selection

Le mercredi 11 février 2015 17:13:12 UTC+1, Ben Fritz a écrit :
> On Wednesday, February 11, 2015 at 3:26:14 AM UTC-6, Enno wrote:
> > Le mardi 10 février 2015 09:22:35 UTC+1, Enno a écrit :
> > > Hello,
> > >
> > > There is a thread on StackOverflow labelled
> > >
> > > "How to get visually selected text in VimScript"
> > >
> > > The naive and stable approach would be
> > >
> > > let old_reg = @v
> > > normal! gv"vy
> > > let raw_search = @v
> > > let @v = old_reg
> > > return raw_search
> > >
> > > but that only works if `set nosecure`. If `set secure` then
> > > the functions become involved. I posted my own take at
> > >
> > > http://stackoverflow.com/questions/1533565/how-to-get-visually-selected-text-in-vimscript/28398359#28398359
> > >
> > > but it handles neither block-wise selections nor multibyte columns. A function that supports both is for example given at
> > >
> > > https://github.com/haya14busa/vim-asterisk/blob/4fda3a4d90926512fbb10eda8b7b0491c650eb5e/autoload/asterisk.vim#L163
> > >
> > > Is there a simple solution at all?
> > >
> > > Enno
> >
> > Hello Ben,
> >
> > The function throws an error E523 that, by :help E523, appears only if &secure.
> >
> > To reproduce, put
> >
> > set secure
> > fun! grep#GetVis()
> > let old_reg = @v
> > normal! gv"vy
> > let raw_search = @v
> > let @v = old_reg
> > return raw_search
> > endfun
> >
> > in ~/.vim/autoload/grep.vim
> >
> > and source
> >
> > set secure
> > xnoremap <expr> * '/' . grep#GetVis() . '<CR>'
> >
> > Then hitting viw* throws
> >
> > Error detected while processing function grep#GetVis:
> > line 2:
> > E523: Not allowed here
> >
> > instead of searching for the selected text.
>
> 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().

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