Add nix-shell to starship

home-manager/home.nix

@@ -252,7 +252,9 @@ in
           + "$kotlin"
           + "$haskell"
           + "$python"
-          + "[](fg:green bg:sapphire)"
+          + "[](fg:green bg:black)"
+          + "$nix_shell"
+          + "[](fg:black bg:sapphire)"
           + "$conda"
           + "[](fg:sapphire bg:lavender)"
           + "$time"
@@ -283,6 +285,7 @@ in
             Debian = "󰣚";
             Redhat = "󱄛";
             RedHatEnterprise = "󱄛";
+            NixOS = "";
           };
         };
         username = {
@@ -369,6 +372,11 @@ in
           format = ''[$symbol$environment ]($style)'';
           ignore_base = false;
         };
+        nix_shell = {
+          symbol = "󱄅";
+          style = "bg:black";
+          format = ''[[ $symbol( $name) ](fg:blue bg:black)]($style)'';
+        };
         time = {
           disabled = false;
           time_format = "%R";