fix(frappe): premailer dep

src/overlays/python/default.nix

@@ -5,6 +5,7 @@ pyFinal: pyPrev: {
   traceback-with-variables = pyFinal.callPackage ./traceback-with-variables {};
   uuid-utils = pyFinal.callPackage ./uuid-utils.nix {};
   sql_metadata = pyFinal.callPackage ./sql_metadata.nix {};
+  premailer = pyFinal.callPackage ./premailer.nix {}; # not anymore in nixpkgs, see: https://github.com/NixOS/nixpkgs/pull/348580
 
   # erpnext dependencies
   plaid-python = pyFinal.callPackage ./plaid-python.nix {}; # old version

src/overlays/python/premailer.nix

@@ -0,0 +1,42 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchPypi,
+  isPy27,
+  cssselect,
+  cssutils,
+  lxml,
+  mock,
+  nose,
+  requests,
+  cachetools,
+}:
+buildPythonPackage rec {
+  pname = "premailer";
+  version = "3.10.0";
+  format = "setuptools";
+  disabled = isPy27; # no longer compatible with urllib
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "d1875a8411f5dc92b53ef9f193db6c0f879dc378d618e0ad292723e388bfe4c2";
+  };
+
+  buildInputs = [
+    mock
+    nose
+  ];
+  propagatedBuildInputs = [
+    cachetools
+    cssselect
+    cssutils
+    lxml
+    requests
+  ];
+
+  meta = {
+    description = "Turns CSS blocks into style attributes";
+    homepage = "https://github.com/peterbe/premailer";
+    license = lib.licenses.bsd3;
+  };
+}