1 files changed, 26 insertions, 0 deletions
diff --git a/apps/strongswan/options/lib.nix b/apps/strongswan/options/lib.nix
new file mode 100644
index 0000000..5b0808f
--- /dev/null
+++ b/apps/strongswan/options/lib.nix
@@ -0,0 +1,26 @@
+lib:
+
+let
+  inherit (lib) mkOption mkOptionType mergeOneOption elem flip concatStringsSep;
+  inherit (lib.types) nullOr submodule bool either;
+
+in rec {
+  default = v: type: mkOption { type = type; default = v; };
+  optional = type: mkOption { type = nullOr type; default = null; };
+  set = opts: mkOption { type = nullOr (submodule { options = opts; }); default = null; };
+
+  # XXX https://github.com/NixOS/nixpkgs/issues/9826
+  enum' = values:
+    let show = v: let t = builtins.typeOf v;
+            in if t == "string" then ''"${v}"''
+          else if t == "int" then builtins.toString v
+          else ''<${t}>'';
+    in mkOptionType {
+      name = "one of ${concatStringsSep ", " (map show values)}";
+      check = flip elem values;
+      merge = mergeOneOption;
+    };
+
+  boolean = either bool (enum' [ "yes" "no" ]);
+  boolOr = l: either bool (enum' ([ "yes" "no" ] ++ l));
+}