From 38e449aceb611661e899b4dec0babf166ddd5f09 Mon Sep 17 00:00:00 2001
From: Itamar Turner-Trauring <itamar@itamarst.org>
Date: Mon, 27 Sep 2021 16:44:43 -0400
Subject: [PATCH] Add collections-extended.

---
 nix/collections-extended.nix | 19 +++++++++++++++++++
 nix/overlays.nix             |  3 +++
 2 files changed, 22 insertions(+)
 create mode 100644 nix/collections-extended.nix

diff --git a/nix/collections-extended.nix b/nix/collections-extended.nix
new file mode 100644
index 000000000..3f1ad165a
--- /dev/null
+++ b/nix/collections-extended.nix
@@ -0,0 +1,19 @@
+{ lib, buildPythonPackage, fetchPypi }:
+buildPythonPackage rec {
+  pname = "collections-extended";
+  version = "1.0.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0lb69x23asd68n0dgw6lzxfclavrp2764xsnh45jm97njdplznkw";
+  };
+
+  # Tests aren't in tarball, for 1.0.3 at least.
+  doCheck = false;
+
+  meta = with lib; {
+    homepage = https://github.com/mlenzen/collections-extended;
+    description = "Extra Python Collections - bags (multisets), setlists (unique list / indexed set), RangeMap and IndexedDict";
+    license = licenses.asl20;
+  };
+}
diff --git a/nix/overlays.nix b/nix/overlays.nix
index 2bf58575e..aae808131 100644
--- a/nix/overlays.nix
+++ b/nix/overlays.nix
@@ -18,6 +18,9 @@ self: super: {
 
       # Need a newer version of Twisted, too.
       twisted = python-super.callPackage ./twisted.nix { };
+
+      # collections-extended is not part of nixpkgs at this time.
+      collections-extended = python-super.callPackage ./collections-extended.nix
     };
   };
 }