From 516a7f72a881c9dbd9d7711731195cb2a714143b Mon Sep 17 00:00:00 2001
From: Frederik Rietdijk <fridh@fridh.nl>
Date: Wed, 24 Mar 2021 11:54:42 +0100
Subject: [PATCH] python2Packages.chardet: keep 3.0.4

---
 pkgs/development/python-modules/chardet/2.nix | 29 +++++++++++++++++++
 pkgs/top-level/python-packages.nix            |  5 +++-
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/development/python-modules/chardet/2.nix

diff --git a/pkgs/development/python-modules/chardet/2.nix b/pkgs/development/python-modules/chardet/2.nix
new file mode 100644
index 000000000000..65381d40268f
--- /dev/null
+++ b/pkgs/development/python-modules/chardet/2.nix
@@ -0,0 +1,29 @@
+{ lib, buildPythonPackage, fetchPypi, fetchpatch
+, pytest, pytestrunner, hypothesis }:
+
+buildPythonPackage rec {
+  pname = "chardet";
+  version = "3.0.4";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1bpalpia6r5x1kknbk11p1fzph56fmmnp405ds8icksd3knr5aw4";
+  };
+
+  patches = [
+    # Add pytest 4 support. See: https://github.com/chardet/chardet/pull/174
+    (fetchpatch {
+      url = "https://github.com/chardet/chardet/commit/0561ddcedcd12ea1f98b7ddedb93686ed8a5ffa4.patch";
+      sha256 = "1y1xhjf32rdhq9sfz58pghwv794f3w2f2qcn8p6hp4pc8jsdrn2q";
+    })
+  ];
+
+  checkInputs = [ pytest pytestrunner hypothesis ];
+
+  meta = with lib; {
+    homepage = "https://github.com/chardet/chardet";
+    description = "Universal encoding detector";
+    license = licenses.lgpl2;
+    maintainers = with maintainers; [ domenkozar ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 80e9b27fc118..be95234ecf1c 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1318,7 +1318,10 @@ in {
 
   characteristic = callPackage ../development/python-modules/characteristic { };
 
-  chardet = callPackage ../development/python-modules/chardet { };
+  chardet = if isPy3k then
+    callPackage ../development/python-modules/chardet { }
+  else
+    callPackage ../development/python-modules/chardet/2.nix { };
 
   chart-studio = callPackage ../development/python-modules/chart-studio { };