Re: Theme dev (Selenized) help: SpellRare and undercurl not working in Vim, works in NeoVim

On Thu, Apr 2, 2020 at 9:20 AM Christian Brabandt <cblists@256bit.org> wrote:
>
>
> On Mi, 01 Apr 2020, Daniel Gray wrote:
>
> > Hi,
> >
> > I'm currently working on a theme called Selenized https://github.com/jan-warchol/selenized/
> >
> > We're using https://github.com/lifepillar/vim-colortemplate to template
> > our theme.
> >
> > The issue I'm having is https://github.com/jan-warchol/selenized/pull/71#pullrequestreview-375757756
> >
> > We cannot seem to get SpellRare to work in Vim, yet it works in NeoVim.
> >
> > The Vim config is extremely simple:
> >
> > set t_Co=16
> > set termguicolors
> > colorscheme selenized
> > set spelllang=en_au
> > setlocal spell spelllang=en_au
> > set spell
> > set nu
> > syntax on
> >
> > My NeoVim config is the same except that it doesn't have set t_Co=16
> > because that's not supported.
> >
> > We want the theme when running in Vim to look the same as it does in
> > NeoVim.
> >
> > I included a screenshot:
> >
> > https://user-images.githubusercontent.com/48640805/76826205-c3640200-6813-11ea-859f-e6c9a3c6e0c4.png
> >
> > as well as the generated theme:
> >
> > https://github.com/jan-warchol/selenized/pull/71#discussion_r401316369
> >
> > I'm hoping someone can give us a hand as we really want to support Vim
> > too, not just NeoVim.
>
> First of all, I am not really sure what the problem is. I saw a long
> discussion, but did not find a clear problem description :/
>
> So what exactly is not working with SpellRare? Can you please provide a
> reproducible example with just the required highlighting commands?
>
> Also `:set t_Co=16` and `:set termguicolors` does not make any sense.
> Either your terminal does support only 16 colors (in which case it won't
> support rgb colors, or it supports rgb colors, so the `:set t_Co=16`
> should not be set.
>
> Them you shouldn't have to `:set t_Co=16` and rather rely on Vim for
> determining the capabilities of the terminal rather than overriding it.
> This means, you have to configure your terminal correctly (e.g. if you
> export TERM=xterm, then Vim will think your terminal is only capable of
> using 16 colors).
>
> And finally, I haven't actually seen any modern terminal, that does not
> support at least 256 colors. So you might want to decide not to support
> 16 color terminals only.
>
> Best,
> Christian

AFAIK, the Linux non-X console ($TERM == 'linux', accessed with
Ctrl-Alt-F1 to Ctrl-Alt-F6, come back with Ctrl-Alt-F7) can only do 8
background and 16 foreground colours; or maybe also 16 background
colours without the ability to blink. Of course it might be regarded
as "non-modern", but it is still in use. I occasionally use it, even
with Vim.

Best regards,
Tony.

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