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

On Do, 02 Apr 2020, Tony Mechelynck wrote:

> 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.

I believe even the linux console (since v3.16) can detect and use the
rgb ansi terminal color codes, but rounds them back to 16 color codes.

Best,
Christian
--
DAU: Ich habe ein Makro geschrieben, das testet ob der Benutzer anwesend ist.
EDV: Wie das denn?
DAU: Naja, es fragt eben danach.

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