feat(nvim): make golang a devshell

homeManagerModules/neovim/langs/golang/default.nix

@@ -1,27 +1,42 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }: let
   inherit (lib) mkIf;
 
   cfg = config.programs.neovim;
+  flakeEnv = config.programs.bash.sessionVariables.FLAKE;
 in {
-  config = mkIf (cfg.enable && cfg.ideConfig.enableGolang) {
+  config = mkIf cfg.enable {
     programs = {
       neovim = {
-        extraPackages = with pkgs; [go gopls];
-
         extraLuaConfig =
           # lua
           ''
+            --
             local lsp = require('lspconfig');
             local default_capabilities = require('cmp_nvim_lsp').default_capabilities();
 
             lsp.gopls.setup({
-                cmd = { '${pkgs.gopls}/bin/gopls' },
                 capabilities = default_capabilities,
+                autostart = false,
+            });
+
+            vim.api.nvim_create_autocmd({ 'FileType', 'BufEnter' }, {
+                pattern = { 'go', 'gomod', 'gowork', 'gotmpl' },
+
+                callback = function()
+                    vim.cmd[[setlocal ts=4 sw=4 sts=0 expandtab]];
+
+                    if (devShells['golang'] == nil) then
+                        devShells['golang'] = 1;
+
+                        require('nix-develop').nix_develop_extend({'${flakeEnv}#golang'}, function()
+                            vim.cmd[[LspStart]];
+                        end);
+                    end
+                end,
             });
           '';
       };