conditional mapping of <C-d>, <C-u> depending on whether plugin exists

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conditional mapping of <C-d>, <C-u> depending on whether plugin exists

Bok Woon Chua
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?

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Re: conditional mapping of <C-d>, <C-u> depending on whether plugin exists

Luc Hermitte
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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Re: conditional mapping of <C-d>, <C-u> depending on whether plugin exists

Bok Woon Chua
On Wednesday, 30 May 2018 22:02:53 UTC+8, Luc Hermitte  wrote:

> 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
Many thanks, it works now with the file check method.

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