Hi,

----- Mail original -----
> I use https://github.com/terryma/vim-smooth-scroll and so I bind
> <C-d> & <C-u> to ":call smooth_scroll#down(&scroll, 5, 2)<CR>" &
> ":call smooth_scroll#up(&scroll, 5, 2)<CR>" respectively. However I
> would like <C-d> & <C-u> to default to their original behaviour if
> the smooth scroll plugin isn't loaded.
> 
> I've tried this:
> 
> if exists('g:loaded_smoothscroll')
>   noremap <silent> <C-u> :call smooth_scroll#up(&scroll, 5, 2)<CR>
>   noremap <silent> <C-d> :call smooth_scroll#down(&scroll, 5, 2)<CR>
> endif
> 
> but strangely it ignores the mapping if I load it like that. That
> means the exists('g:loaded_smoothscroll') check failed, but doing an
> :echo exists('g:loaded_smoothscroll') does indeed return 1. I'm
> guessing at the moment of sourcing the vimrc g:loaded_smoothscroll
> was 0, then it got set to 1 after after the mapping got read. How do
> I get around that?
> 
> If it helps I actually put the variable let g:loaded_smoothscroll = 1
> into the plugin/smooth_scroll.vim file (which did not exist in the
> author's original version, I had to fork it myself). Is that the
> correct place to put the g:loaded_smoothscroll variable?

No, it's not.
Autoload plugins aren't expected to have an anti-inclusion guard. Beside, plain 
plugins are loaded **after** the .vimrc file has been sourced.

What you can do instead is to check whether the file exists with 

if !empty(globpath(&rtp, 'autoload/smooth_scroll.vim'))
    nnoremap ...


This needs to be done **after** your plugin manager has kicked in to fill the 
`&rtp` option.


HTH,

-- 
Luc Hermitte

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