nixvim/config/plugins/cmp/cmp.nix

{
  plugins = {
    cmp-emoji = {
      enable = true;
    };
    cmp = {
      enable = true;
      settings = {
        autoEnableSources = true;
        experimental = {
          ghost_text = false;
        };
        performance = {
          debounce = 60;
          fetchingTimeout = 200;
          maxViewEntries = 30;
        };
        snippet = {
          expand = "luasnip";
        };
        formatting = {
          fields = [
            "kind"
            "abbr"
            "menu"
          ];
        };
        sources = [
          { name = "git"; }
          { name = "nvim_lsp"; }
          { name = "emoji"; }
          {
            name = "buffer"; # text within current buffer
            option.get_bufnrs.__raw = "vim.api.nvim_list_bufs";
            keywordLength = 3;
          }
          {
            name = "path"; # file system paths
            keywordLength = 3;
          }
          {
            name = "luasnip"; # snippets
            keywordLength = 3;
          }
        ];

        window = {
          completion = {
            border = "solid";
          };
          documentation = {
            border = "solid";
          };
        };

        mapping = {
          "<C-Tab>" = "cmp.mapping(cmp.mapping.select_next_item(), {'i', 's'})";
          "<C-j>" = "cmp.mapping.select_next_item()";
          "<C-k>" = "cmp.mapping.select_prev_item()";
          "<C-e>" = "cmp.mapping.abort()";
          "<C-b>" = "cmp.mapping.scroll_docs(-4)";
          "<C-f>" = "cmp.mapping.scroll_docs(4)";
          "<C-Space>" = "cmp.mapping.complete()";
          "<C-CR>" = "cmp.mapping.confirm({ select = true })";
          "<S-CR>" = "cmp.mapping.confirm({ behavior = cmp.ConfirmBehavior.Replace, 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 = false;
    }; # autocomplete for cmdline
  };
  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({'/', "?" }, {
       sources = {
         { name = 'buffer' }
       }
     })

    -- Set configuration for specific filetype.
     cmp.setup.filetype('gitcommit', {
       sources = cmp.config.sources({
         { name = 'cmp_git' }, -- You can specify the `cmp_git` source if you were installed it.
       }, {
         { name = 'buffer' },
       })
     })

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