add multiple envs for packages

fish/conf.d/functions.fish

@@ -77,8 +77,71 @@ function gur
 end
 
 function nix_upgrade
-    sudo nix flake update --flake /home/catalin/.dotfiles/nix/
-    sudo nixos-rebuild switch --flake /home/catalin/.dotfiles/nix/ --upgrade
+    # Upgrade this system based on hostname matching the flake host.
+    # Works on both NixOS (nixos-rebuild) and non-NixOS (Home Manager).
+    # Usage: nix_upgrade [host-override]
+
+    set -l flake_path /home/catalin/.dotfiles/nix
+
+    # Determine host either from arg or from the machine hostname
+    if set -q argv[1]
+        set -l host $argv[1]
+    else
+        set -l host (hostname -s)
+        if test $status -ne 0 -o -z "$host"
+            set host (hostname)
+        end
+    end
+
+    if not test -f $flake_path/flake.nix
+        echo "Error: flake not found at $flake_path/flake.nix"
+        return 1
+    end
+
+    # Detect if we are on NixOS
+    set -l is_nixos 0
+    if test -f /etc/NIXOS
+        set is_nixos 1
+    else if type -q nixos-version
+        set is_nixos 1
+    end
+
+    echo "Updating inputs for flake: $flake_path"
+    # On non-NixOS this usually doesn't require sudo; on NixOS it might.
+    if test $is_nixos -eq 1
+        sudo nix flake update --flake $flake_path
+    else
+        nix flake update --flake $flake_path
+    end
+
+    if test $is_nixos -eq 1
+        # NixOS path: verify host exists under nixosConfigurations (heuristic)
+        if not grep -Eq "^[[:space:]]*$host[[:space:]]*=[[:space:]]*lib\\.nixosSystem" $flake_path/flake.nix
+            echo "Error: host '$host' not found in nixosConfigurations in $flake_path/flake.nix."
+            echo "       Pass an explicit host: nix_upgrade <host>"
+            return 1
+        end
+        echo "Rebuilding NixOS for host: $host"
+        sudo nixos-rebuild switch --flake $flake_path#$host --upgrade
+    else
+        # non-NixOS path: try Home Manager via flake's homeConfigurations
+        if not grep -q "homeConfigurations" $flake_path/flake.nix
+            echo "Error: no homeConfigurations found in flake; cannot upgrade on non-NixOS."
+            return 1
+        end
+        # Best-effort heuristic that the host exists as a home configuration
+        if not grep -Eq "^[[:space:]]*$host[[:space:]]*=" $flake_path/flake.nix
+            echo "Warning: host '$host' not explicitly found; attempting Home Manager switch anyway."
+        end
+
+        echo "Rebuilding Home Manager for host: $host"
+        if type -q home-manager
+            home-manager switch --flake $flake_path#$host
+        else
+            # Fallback: use nix to run HM
+            nix run github:nix-community/home-manager -- switch --flake $flake_path#$host
+        end
+    end
 end
 
 function delete_line