fix: nushell homebrew path

modules/home/rsydn/shell/nushell.nix

@@ -1,4 +1,4 @@
-{ config, lib, ... }:
+{ config, pkgs, lib, ... }:
 let
   themeName = "capr4n.omp.json";
   themeSource = ./oh-my-posh/capr4n.omp.json;
@@ -6,20 +6,33 @@ let
   profileBin = "${config.home.profileDirectory}/bin";
   systemBin = "/run/current-system/sw/bin";
   defaultBin = "/nix/var/nix/profiles/default/bin";
+  darwinHomebrewDir = if pkgs.stdenv.hostPlatform.isAarch64 then
+    "/opt/homebrew"
+  else
+    "/usr/local";
+  homebrewBin = "${darwinHomebrewDir}/bin";
+  homebrewSbin = "${darwinHomebrewDir}/sbin";
+  homebrewPaths = if pkgs.stdenv.hostPlatform.isDarwin then
+    lib.unique [ homebrewBin homebrewSbin ]
+  else
+    [ ];
+  formatPathList = paths: lib.concatMapStrings (path: "      \"${path}\"\n") paths;
 in {
   programs.nushell.enable = lib.mkDefault true;
 
   programs.nushell.envFile.text = ''
     let nix_paths = [
-      "${profileBin}"
-      "${systemBin}"
-      "${defaultBin}"
-    ]
+${formatPathList [ profileBin systemBin defaultBin ]}    ]
+
+    let homebrew_paths = [
+${formatPathList homebrewPaths}    ]
+
+    let path_candidates = ($nix_paths | append $homebrew_paths | flatten)
 
     if ($env.PATH? == null) {
-      $env.PATH = $nix_paths
+      $env.PATH = $path_candidates
     } else {
-      for path in $nix_paths {
+      for path in $path_candidates {
         if not ($env.PATH | any {|it| $it == $path}) {
           $env.PATH = ($env.PATH | append $path)
         }