vim9script: <c-r>=Function()<cr> in a mapping fails to work

[Christian J. Robinson]

Source the attached script to see the error. If I prefix Function() with <SID> it does work.  Is this correct behavior?

--

Christian J. Robinson <hep...@gmail.com>

[Bram Moolenaar]

Christian J. Robinson wrote:

> Source the attached script to see the error. If I prefix Function() with
> <SID> it does work. Is this correct behavior?

I cannot see an attachment.

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[Christian J. Robinson]

Oops, here it is.

[Bram Moolenaar]

Christian J. Robinson wrote:

> > > Source the attached script to see the error. If I prefix Function() with
> > > <SID> it does work. Is this correct behavior?
> >
> > I cannot see an attachment.
>

> Oops, here it is.

Which is:

vim9script
def Foo(): string
return "bar"
enddef
vnoremap <leader>foo s<C-R>=Foo()<CR><ESC>
normal v\foo

A mapping does not keep the context of where it was defined, since
it changes typed keys into other keys, without knowing what they mean.

In Vim9 script a function is defined script-local by default.
While "<C-R>=Foo()" calls Foo() from the command line, thus it searches
for a global function.

You can either make Foo() global:
def g:Foo(): string

Or (recommended) prefix <SID> in the mapping. That will be replaced
when the mapping is defined, so that when the mapping is used the right
function can be found:
vnoremap <leader>foo s<C-R>=<SID>Foo()<CR><ESC>

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