weechat: build with python3 by default

WeeChat also supports Python3 for scripts which should be preferred as
CPython2 is about to get EOLed soon: https://weechat.org/scripts/python3/

pkgs/applications/networking/irc/weechat/scripts/default.nix

@@ -1,4 +1,4 @@
-{ callPackage, luaPackages, pythonPackages }:
+{ callPackage, luaPackages }:
 
 {
   weechat-xmpp = callPackage ./weechat-xmpp {
@@ -9,13 +9,9 @@
     inherit (luaPackages) cjson luaffi;
   };
 
-  wee-slack = callPackage ./wee-slack {
-    inherit pythonPackages;
-  };
+  wee-slack = callPackage ./wee-slack { };
 
   weechat-autosort = callPackage ./weechat-autosort { };
 
-  weechat-otr = callPackage ./weechat-otr {
-    inherit pythonPackages;
-  };
+  weechat-otr = callPackage ./weechat-otr { };
 }

pkgs/applications/networking/irc/weechat/scripts/wee-slack/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, substituteAll, buildEnv, fetchFromGitHub, pythonPackages }:
+{ stdenv, substituteAll, buildEnv, fetchFromGitHub, python3Packages }:
 
 stdenv.mkDerivation rec {
   pname = "wee-slack";
@@ -16,8 +16,8 @@ stdenv.mkDerivation rec {
       src = ./libpath.patch;
       env = "${buildEnv {
         name = "wee-slack-env";
-        paths = with pythonPackages; [ websocket_client six ];
-      }}/${pythonPackages.python.sitePackages}";
+        paths = with python3Packages; [ websocket_client six ];
+      }}/${python3Packages.python.sitePackages}";
     })
   ];
 

pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, substituteAll, buildEnv, fetchgit, fetchFromGitHub, pythonPackages, gmp }:
+{ stdenv, substituteAll, buildEnv, fetchgit, fetchFromGitHub, python3Packages, gmp }:
 
 let
   # pure-python-otr (potr) requires an older version of pycrypto, which is
@@ -6,7 +6,7 @@ let
   # of pycrypto will be fetched from the Debian project.
   # https://security-tracker.debian.org/tracker/source-package/python-crypto
 
-  pycrypto = pythonPackages.buildPythonPackage rec {
+  pycrypto = python3Packages.buildPythonPackage rec {
     pname = "pycrypto";
     version = "2.6.1-10";
 
@@ -24,7 +24,7 @@ let
     '';
   };
 
-  potr = pythonPackages.potr.overridePythonAttrs (oldAttrs: {
+  potr = python3Packages.potr.overridePythonAttrs (oldAttrs: {
     propagatedBuildInputs = [ pycrypto ];
   });
 in stdenv.mkDerivation rec {
@@ -44,7 +44,7 @@ in stdenv.mkDerivation rec {
       env = "${buildEnv {
         name = "weechat-otr-env";
         paths = [ potr pycrypto ];
-      }}/${pythonPackages.python.sitePackages}";
+      }}/${python3Packages.python.sitePackages}";
     })
   ];