Add Go version guard into shell.nix

.nix/default.nix

@@ -11,10 +11,14 @@ let
  gotk4-nix = systemPkgs.fetchFromGitHub {
  owner = "diamondburned";
  repo = "gotk4-nix";
- rev = "ad91dabf706946c4380d0a105f0937e4e8ffd75f";
- sha256 = "0rkw9k98qy7ifwypkh2fqhdn7y2qphy2f8xjisj0cyp5pjja62im";
+ rev = "4eab6a0";
+ sha256 = "sha256-WsJ2Cf1hvKT3BUYYVxQ5rNMYi6z7NWccbSsw39lgqO8=";
  };
 
+ minGoVersion = 
+ with builtins;
+ elemAt (elemAt (split "go ([0-9][^\n]*)" (readFile ../go.mod)) 1) 0;
+
 in import "${gotk4-nix}/${action}.nix" rec {
  base = {
  pname = "gotk4";
@@ -39,8 +43,14 @@ in import "${gotk4-nix}/${action}.nix" rec {
  go =
  let
  upstreamPkgs = import "${gotk4-nix}/pkgs.nix" {};
+ go = upstreamPkgs.go;
  in
- upstreamPkgs.go;
+ with systemPkgs.lib;
+ assert assertMsg
+ (versionAtLeast go.version minGoVersion)
+ "go version ${go.version} is too old, need at least ${minGoVersion}";
+
+ go;
  })
  ];
  };

shell.nix

@@ -1,30 +1,8 @@
 { }:
 
 let
- cPackages = [
- "gtk4"
- "gtk3"
- ];
-
  shell = import ./.nix { action = "shell"; };
  pkgs = shell.pkgs;
 in
 
-shell.overrideAttrs (old: {
- shellHook = ''
- ${old.shellHook or ""}
-
- for pkg in ${pkgs.lib.concatStringsSep " " cPackages}; do
- __cpath=$(pkg-config $pkg --cflags-only-I | sed 's/ -I/:/g' | sed 's/^-I//')
- if [[ $__cpath == "" ]]; then
- continue
- fi
-
- if [[ -z $CPATH ]]; then
- export CPATH=$__cpath
- else
- export CPATH=$CPATH:$__cpath
- fi
- done
- '';
-})
+shell