Add suppor for nvim-navic

[xeluxee]

https://github.com/SmiteshP/nvim-navic is a Neovim plugin to show current code context in winbar or statusline. Its highlight groups are similar to CmpItemKind* ones, e.g. NavicIconsMethod and NavicIconsConstant. They can be found in its README.

[sainnhe]

Sorry but I'm too busy recently, I'll look into it when I have time.

And your can also add support for it by yourself, PR is always welcome :)

[antoineco]

I use navic too[^1]:

I agree with the suggestion, adding colors would be a nice touch. It's also not a big risk (i.e. won't disturb users) because navic's highlights are off by default.

You can experiment with different settings in your own Neovim config by declaring an augroup like below, then submit a proposal once you're happy with the result:

-- Apply custom highlights on colorscheme change.
-- Must be declared before executing ':colorscheme'.
grpid = vim.api.nvim_create_augroup('custom_highlights_gruvboxmaterial', {})
vim.api.nvim_create_autocmd('ColorScheme', {
  group = grpid,
  pattern = 'gruvbox-material',
  command = -- navic icon colors
            'hi NavicIconsMethod   guifg=#c35e0a |' ..
            'hi NavicIconsConstant guifg=#b47109'
})

Ideally we should align on the colors used in LSP autocompletions:

[^1]: Here shown with Everforest, a sister colorscheme from sainnhe originally adapted from gruvbox-material.

[xeluxee]

Since nvim-cmp, nvim-navic and aerial.nvim require highlights for LSP item kinds, we could define a color for each kind and assign (or link) highlight groups accordingly, as onedark.nvim does