format.sh: Use isort 5 to stop fighting with Black

default.nix

@@ -37,6 +37,20 @@ let
 
         doCheck = false;
       };
+
+      isort = self.buildPythonPackage rec {
+        pname = "isort";
+        version = "5.5.4";
+
+        src = self.fetchPypi {
+          inherit pname version;
+          sha256 = "ba040c24d20aa302f78f4747df549573ae1eaf8e1084269199154da9c483f07f";
+        };
+
+        propagatedBuildInputs = [self.colorama];
+
+        doCheck = false;
+      };
     };
   };
   pythonEnv = python.withPackages (ps: runDependencies ps ++ testDependencies ps);

format.sh

 #!/bin/bash
-nix-shell -A package --run 'isort --recursive .; black setup.py cinematinator'
+nix-shell -A package --run 'isort .; black setup.py cinematinator'