From 7e6e87e7eb79437c4d12877d620fb7ee043fd58f Mon Sep 17 00:00:00 2001
From: Jonathan Ringer <jonringer117@gmail.com>
Date: Sat, 4 Jul 2020 08:03:58 -0700
Subject: [PATCH] python3Packages.pipdate: fix dependency management

---
 pkgs/development/python-modules/pipdate/default.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pkgs/development/python-modules/pipdate/default.nix b/pkgs/development/python-modules/pipdate/default.nix
index 4e730df1c91..5cc5789144f 100644
--- a/pkgs/development/python-modules/pipdate/default.nix
+++ b/pkgs/development/python-modules/pipdate/default.nix
@@ -1,8 +1,10 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, pythonOlder
 , isPy27
 , appdirs
+, importlib-metadata
 , requests
 , pytest
 }:
@@ -20,8 +22,16 @@ buildPythonPackage rec {
   propagatedBuildInputs = [
     appdirs
     requests
+  ] ++ lib.optionals (pythonOlder "3.8") [
+    importlib-metadata
   ];
 
+  # can be removed when https://github.com/nschloe/pipdate/pull/41 gets merged
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace "importlib_metadata" "importlib_metadata; python_version < \"3.8\""
+  '';
+
   checkInputs = [
     pytest
   ];