Add support for split borders

[ihasdapie]

With https://github.com/neovim/neovim/pull/17266 being merged in it would be nice to have better highlights and drawing characters for splits.

This is what kanagawa looks like right now

As opposed to another colorscheme which implements it e.g. gruvbox or catppuccin

[rebelot]

Yup, I was playing with this today. I will add a globalStatus bool option to control the highlighting of window separator. I'll see wether it's best to also add fillchars presets or not.

It would be great to have WinSeparatorNC to complement with NormalNC tho

[rebelot]

it's now supported as of 42584e5

[kting28]

Hi I'm looking at enabling the split border but this globalStatus option is no longer there. What's the latest way of making the split separator more visible?

[rebelot]

You can use thicker 'fillchars', or change their color to your liking, e.g.

            require("kanagawa").setup({
                overrides = function(colors)
                    local theme = colors.theme
                    return {
                        WinSeparator = { fg = theme.ui.nontext }, -- brighter
                        WinSeparator = { fg = "black" }, -- darker
                    }
                end,
            })

[kting28]

Awesome thanks! Just another question - this changes the color of the active win separator. How about the inactive one? (i.e. in horizontal split when the lower is active and upper bar is inactive). Want to see where to override to make that lighter. Thanks.

[rebelot]

Awesome thanks! Just another question - this changes the color of the active win separator. How about the inactive one? (i.e. in horizontal split when the lower is active and upper bar is inactive). Want to see where to override to make that lighter. Thanks.

there's no such hlgroup. The closest thing to that would be using dimInactive, This is the default value for WinSeparator taking dimInactive option into account

        WinSeparator = { fg = theme.ui.bg_m3, bg = config.dimInactive and theme.ui.bg_dim or "NONE" },

[kting28]

For me it seems dimInactive is flipped as in the dimmed split actually got highlighted due to the higher contrast (the bg got darker while text is the same ). Will mess around to see if I can flip it.