Neovim can be themed using the Noctalia via the base16 colorscheme.

Setup

1. Enable User Templates in Noctalia:
   • Open Settings → Color Scheme → Templates → Advanced → Enable User Templates
2. Add a user template for neovim
   • Copy this into /.config/noctalia/user-templates.toml

    [templates.nvim-base16]
    input_path = "~/.config/nvim/lua/matugen-template.lua"
    output_path = "~/.config/nvim/lua/matugen.lua"
    post_hook = 'pkill -SIGUSR1 nvim'
   

3. Install the base16 colorscheme by RRethy, using your package manager of choice. e.g. with Lazy:

    return { 'RRethy/base16-nvim',
      config = function()
        require('matugen').setup()
      end,
    }
   

4. Add the template to your neovim configuration: Add the following file to you neovim configuration (in ~/.config/nvim/lua/matugen-template.lua, as above):

    local M = {}
   
    function M.setup()
      require('base16-colorscheme').setup {
        -- Background tones
        base00 = '', -- Default Background
        base01 = '', -- Lighter Background (status bars)
        base02 = '', -- Selection Background
        base03 = '', -- Comments, Invisibles
        -- Foreground tones
        base04 = '', -- Dark Foreground (status bars)
        base05 = '', -- Default Foreground
        base06 = '', -- Light Foreground
        base07 = '', -- Lightest Foreground
        -- Accent colors
        base08 = '', -- Variables, XML Tags, Errors
        base09 = '', -- Integers, Constants
        base0A = '', -- Classes, Search Background
        base0B = '', -- Strings, Diff Inserted
        base0C = '', -- Regex, Escape Chars
        base0D = '', -- Functions, Methods
        base0E = '', -- Keywords, Storage
        base0F = '', -- Deprecated, Embedded Tags
      }
    end
   
    -- Register a signal handler for SIGUSR1 (matugen updates)
    local signal = vim.uv.new_signal()
    signal:start(
      'sigusr1',
      vim.schedule_wrap(function()
        package.loaded['matugen'] = nil
        require('matugen').setup()
      end)
    )
   
    return M
   

   The setup function applies the theme, while the signal handler clears the old theme module out of the lua cache, then applies the new theme, whenever nvim is signalled with SIGUSR1.

5. Setup base16 in your init.lua

    require('matugen').setup()
   

   When you restart neovim, it should use your noctalia theme.