Add menu so we remember the gomod2nix commands

flake.lock

@@ -1,5 +1,28 @@
 {
   "nodes": {
+    "devshell": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1678957337,
+        "narHash": "sha256-Gw4nVbuKRdTwPngeOZQOzH/IFowmz4LryMPDiJN/ah4=",
+        "owner": "numtide",
+        "repo": "devshell",
+        "rev": "3e0e60ab37cd0bf7ab59888f5c32499d851edb47",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "devshell",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -71,6 +94,7 @@
     },
     "root": {
       "inputs": {
+        "devshell": "devshell",
         "flake-utils": "flake-utils",
         "gomod2nix": "gomod2nix",
         "nixpkgs": "nixpkgs_2"

flake.nix

@@ -5,21 +5,33 @@
     nixpkgs.url = "github:NixOS/nixpkgs/release-22.11";
     flake-utils.url = "github:numtide/flake-utils";
     gomod2nix.url = "github:nix-community/gomod2nix";
+    devshell = {
+      url = "github:numtide/devshell";
+      inputs.flake-utils.follows = "flake-utils";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils, gomod2nix }:
+  outputs = { self, nixpkgs, flake-utils, gomod2nix, devshell }:
 
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs
           {
             inherit system;
-            overlays = [ gomod2nix.overlays.default ];
+            overlays = [ gomod2nix.overlays.default devshell.overlays.default ];
           };
       in
       {
-        devShells.default = pkgs.mkShell {
+        devShells.default = pkgs.devshell.mkShell {
           packages = with pkgs; [ go gotools golangci-lint gopls gopkgs go-outline gomod2nix.packages.${system}.default ];
+          commands = [
+            {
+              name = "update-gomod2nix";
+              help = "update gomod2nix.toml";
+              command = "gomod2nix";
+            }
+	  ];
         };
         packages = rec {
           default = pkgs.buildGoApplication {