1 files changed, 23 insertions, 0 deletions
diff --git a/lib/types.nix b/lib/types.nix
new file mode 100644
index 0000000..197633e
--- /dev/null
+++ b/lib/types.nix
@@ -0,0 +1,23 @@
+{ lib, ... }:
+with lib;
+rec {
+  # POSIX.1‐2013, 3.2 Absolute Pathname
+  absolute-pathname = mkOptionType {
+    name = "POSIX absolute pathname";
+    check = x: isString x && substring 0 1 x == "/" && pathname.check x;
+    merge = mergeOneOption;
+  };
+
+  file-mode = mkOptionType {
+    name = "file mode";
+    check = test "[0-7]{4}";
+    merge = mergeOneOption;
+  };
+
+  # POSIX.1‐2013, 3.278 Portable Filename Character Set
+  filename = mkOptionType {
+    name = "POSIX filename";
+    check = test "([0-9A-Za-z._])[0-9A-Za-z._-]*";
+    merge = mergeOneOption;
+  };
+}