oh-my-posh: build-time nushell config generation

tests/modules/programs/oh-my-posh/nushell.nix

@@ -1,4 +1,4 @@
-{ pkgs, config, ... }:
+{ lib, pkgs, realPkgs, config, ... }:
 
 {
   programs = {
@@ -10,25 +10,17 @@
     };
   };
 
+  _module.args.pkgs = lib.mkForce realPkgs;
+
   nmt.script = let
     configFile = if pkgs.stdenv.isDarwin && !config.xdg.enable then
       "home-files/Library/Application Support/nushell/config.nu"
     else
       "home-files/.config/nushell/config.nu";
-
-    envFile = if pkgs.stdenv.isDarwin && !config.xdg.enable then
-      "home-files/Library/Application Support/nushell/env.nu"
-    else
-      "home-files/.config/nushell/env.nu";
   in ''
-    assertFileExists "${envFile}"
-    assertFileRegex \
-      "${envFile}" \
-      '/bin/oh-my-posh init nu --config .*--print \| save --force /.*/home-files/\.cache/oh-my-posh/init\.nu'
-
     assertFileExists "${configFile}"
     assertFileRegex \
       "${configFile}" \
-      'source /.*/\.cache/oh-my-posh/init\.nu'
+      'source /nix/store/[^/]*-oh-my-posh-nushell-config'
   '';
 }