{ ... }: {
  programs.nixvim.plugins = {
    # Snippet engine for neovim
    luasnip.enable = true;
    cmp_luasnip.enable = true;
    # CMP  Addons
    cmp-buffer.enable = true;
    cmp-path.enable = true;
    cmp-nvim-lsp.enable = true;
    cmp-nvim-lsp-document-symbol.enable = true;
    cmp-nvim-lsp-signature-help.enable = true;

    cmp.settings = {
      sources = [
        { name = "nvim_lua"; }
        { name = "nvim_lsp"; }
        { name = "calc"; }
        { name = "path"; }
        { name = "buffer"; }
        { name = "luasnip"; }
      ];
      snippet.expand = "luasnip";
 
    };

    nvim-cmp = {
      enable = true;
      autoEnableSources = true;
      mapping = {
        "<C-Space>" = "cmp.mapping.complete()";
        "<C-d>" = "cmp.mapping.scroll_docs(-4)";
        "<C-e>" = "cmp.mapping.close()";
        "<C-f>" = "cmp.mapping.scroll_docs(4)";
        "<CR>"  = "cmp.mapping.confirm({ select = true })";
        "<S-Tab>" =  "cmp.mapping.select_prev_item()";
        "<Tab>"   = "cmp.mapping.select_next_item()";
      };
      window = {
        completion.border = "rounded"; 
        documentation.border = "rounded";
      };
      formatting = {
        fields = [ "menu" "abbr" "kind" ];
        # https://rsdlt.github.io/posts/rust-nvim-ide-guide-walkthrough-development-debug/
        format = ''
          function(entry, item)
            local menu_icon = {
              nvim_lsp = 'λ',
              luasnip = '⋗',
              buffer = 'Ω',
              path = '🖫',
            }
            item.menu = menu_icon[entry.source.name]
            return item
          end,
        '';
      };
    };
  };
}