[flake] Add some scripts

flake.nix

@@ -334,12 +334,30 @@
 
               sudo ${nixos-rebuild}/bin/nixos-rebuild $1 --flake .
             '')
+          (with pkgs;
+            writeScriptBin "all-hosts" ''
+              nix eval --json .#nixosConfigurations --apply builtins.attrNames 2>/dev/null | jq -r .[]
+            '')
+          (with pkgs;
+            writeScriptBin "option" ''
+              host=$1
+              option=$2
+              nix eval .#nixosConfigurations.$host.config.$option 2>/dev/null
+            '')
+          (with pkgs;
+            writeScriptBin "hm-option" ''
+              host=$1
+              option=$2
+              user=$3
+              if [[ -z $user ]]; then
+                user=$USER
+              fi
+              nix eval .#nixosConfigurations.$host.config.home-manager.users.$user.$option 2>/dev/null
+            '')
           (with pkgs;
             writeScriptBin "test-config" ''
               #!${stdenv.shell}
-              hosts=$(nix eval --json .#nixosConfigurations --apply builtins.attrNames | jq -r .[])
-
-              for host in $hosts; do
+              for host in $(all-hosts); do
                 echo == Checking ''${host}..
                 nixos-rebuild --flake .#$host dry-build 2> /tmp/build-output
                 if [[ $? -ne 0 ]]; then