types.nix: Add ‘either’ type

2014-08-19 18:24:37 +02:00
parent e51ae0ecd3
commit f932910323
1 changed files with 6 additions and 0 deletions
@@ -200,6 +200,12 @@ rec {
      merge = mergeOneOption;
    };

+    either = t1: t2: mkOptionType {
+      name = "${t1.name} or ${t2.name}";
+      check = x: t1.check x || t2.check x;
+      merge = mergeOneOption;
+    };
+
    # Obsolete alternative to configOf.  It takes its option
    # declarations from the ‘options’ attribute of containing option
    # declaration.