nixos/home/common/core/nixvim/plugins/cmp.nix

{
  programs.nixvim.plugins = {
    cmp-emoji = { enable = true; };
    cmp = {
      enable = true;
      cmdline = {};
      settings = {
        autoEnableSources = true;
        experimental = { ghost_text = true; };
        performance = {
          debounce = 60;
          fetchingTimeout = 200;
          maxViewEntries = 30;
        };
        snippet = { expand = "function(args) require('luasnip').lsp_expand(args.body) end"; };
        formatting = {
          fields = [ "kind" "abbr" "menu" ];
          format = ''
            function(entry, vim_item)
                  vim_item.kind = string.format('%s %s', kind_icons[vim_item.kind], vim_item.kind)
                  vim_item.menu = ({
                    nvim_lsp = "[LSP]",
                    nvim_lua = "[Lua]",
                    luasnip = "[Snippet]",
                    buffer = "[Buffer]",
                    path = "[Path]",
                    ["vim-dadbod-completion"] = "[SQL-dadbod]"
                  })[entry.source.name]
                  return vim_item
                end,
          '';
        };
        sources = [
          { name = "nvim_lsp"; }
          { name = "nvim_lua"; }
          { name = "luasnip"; }
          { name = "buffer"; }
          { name = "path"; }
          { name = "vim-dadbod-completion"; }
        ];
        window = {
          completion = { border = "solid"; };
          documentation = { border = "solid"; };
        };
        mapping = {
          "<Tab>" = "cmp.mapping(cmp.mapping.select_next_item(), {'i', 's'})";
          "<S-Tab>" = "cmp.mapping.select_prev_item()";
          "<C-b>" = "cmp.mapping.scroll_docs(-4)";
          "<C-f>" = "cmp.mapping.scroll_docs(4)";
          "<CR>" = "cmp.mapping.confirm({ select = true })";
        };
      };
    };
    cmp-nvim-lsp = { enable = true; }; # lsp
    cmp-buffer = { enable = true; };
    cmp-path = { enable = true; }; # file system paths
    cmp_luasnip = { enable = true; }; # snippets
    cmp-cmdline = { enable = true; }; # autocomplete for cmdline
  };
  programs.nixvim.extraConfigLua = ''
        luasnip = require("luasnip")
        kind_icons = {
          Text = "󰊄",
          Method = "",
          Function = "󰡱",
          Constructor = "",
          Field = "",
          Variable = "󱀍",
          Class = "",
          Interface = "",
          Module = "󰕳",
          Property = "",
          Unit = "",
          Value = "",
          Enum = "",
          Keyword = "",
          Snippet = "",
          Color = "",
          File = "",
          Reference = "",
          Folder = "",
          EnumMember = "",
          Constant = "",
          Struct = "",
          Event = "",
          Operator = "",
          TypeParameter = "",
        } 

         local cmp = require'cmp'

     -- Use buffer source for `/` (if you enabled `native_menu`, this won't work anymore).
     cmp.setup.cmdline({'/', "?" }, {
       mapping = cmp.mapping.preset.cmdline(),
       sources = {
         { name = 'buffer' }
       }
     })

     -- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
     cmp.setup.cmdline(':', {
       mapping = cmp.mapping.preset.cmdline(),
       sources = cmp.config.sources({
         { name = 'path' }
       }, {
         { name = 'cmdline' }
       }),
     })  '';
}