salut-a-toi: Move pythonPackages dependencies not required by other packages into salut-a-toi derivation

pkgs/applications/networking/instant-messengers/salut-a-toi/default.nix

@@ -1,7 +1,12 @@
-{stdenv, fetchurl, python27Packages, file }:
+{ stdenv, fetchurl, python27Packages, file }:
 
 let
   inherit (python27Packages) python;
+  requirements = (import ./requirements.nix {
+    inherit stdenv fetchurl;
+    pythonPackages = python27Packages;
+  });
+
 in
   stdenv.mkDerivation rec {
     name = "salut-a-toi";
@@ -16,9 +21,12 @@ in
     buildInputs = with python27Packages;
     [
       python twisted urwid wxPython pygobject2
-      wokkel dbus-python pyfeed wrapPython setuptools file 
+      dbus-python wrapPython setuptools file
       pycrypto pyxdg
-    ];
+    ] ++  (with requirements; [
+      pyfeed
+      wokkel
+    ]);
 
     configurePhase = ''
       sed -i "/use_setuptools/d" setup.py

pkgs/applications/networking/instant-messengers/salut-a-toi/requirements.nix

@@ -0,0 +1,67 @@
+{ fetchurl
+, stdenv
+, pythonPackages
+}:
+
+let
+  buildPythonPackage = pythonPackages.buildPythonPackage;
+
+  xe = buildPythonPackage rec {
+    url = "http://www.blarg.net/%7Esteveha/xe-0.7.4.tar.gz";
+    name = stdenv.lib.nameFromURL url ".tar";
+    src = fetchurl {
+      inherit url;
+      sha256 = "0v9878cl0y9cczdsr6xjy8v9l139lc23h4m5f86p4kpf2wlnpi42";
+    };
+
+    # error: invalid command 'test'
+    doCheck = false;
+
+    meta = {
+      homepage = "http://home.blarg.net/~steveha/xe.html";
+      description = "XML elements";
+    };
+  };
+
+in {
+
+  pyfeed = (buildPythonPackage rec {
+    url = "http://www.blarg.net/%7Esteveha/pyfeed-0.7.4.tar.gz";
+
+    name = stdenv.lib.nameFromURL url ".tar";
+
+    src = fetchurl {
+      inherit url;
+      sha256 = "1h4msq573m7wm46h3cqlx4rsn99f0l11rhdqgf50lv17j8a8vvy1";
+    };
+
+    propagatedBuildInputs = [ xe ];
+
+    # error: invalid command 'test'
+    doCheck = false;
+
+    meta = with stdenv.lib; {
+      homepage = "http://home.blarg.net/~steveha/pyfeed.html";
+      description = "Tools for syndication feeds";
+    };
+
+  });
+
+  wokkel = buildPythonPackage (rec {
+    url = "http://wokkel.ik.nu/releases/0.7.0/wokkel-0.7.0.tar.gz";
+    name = stdenv.lib.nameFromURL url ".tar";
+    src = fetchurl {
+      inherit url;
+      sha256 = "0rnshrzw8605x05mpd8ndrx3ri8h6cx713mp8sl4f04f4gcrz8ml";
+    };
+
+    propagatedBuildInputs = with pythonPackages; [twisted dateutil];
+
+    meta = with stdenv.lib; {
+      description = "Some (mainly XMPP-related) additions to twisted";
+      homepage = "http://wokkel.ik.nu/";
+      license = licenses.mit;
+    };
+  });
+
+}

pkgs/development/python-modules/pyfeed/default.nix

@@ -1,23 +0,0 @@
-{ stdenv, buildPythonPackage, fetchurl
-, xe }:
-
-buildPythonPackage rec {
-  url = "http://www.blarg.net/%7Esteveha/pyfeed-0.7.4.tar.gz";
-
-  name = stdenv.lib.nameFromURL url ".tar";
-
-  src = fetchurl {
-    inherit url;
-    sha256 = "1h4msq573m7wm46h3cqlx4rsn99f0l11rhdqgf50lv17j8a8vvy1";
-  };
-
-  propagatedBuildInputs = [ xe ];
-
-  # error: invalid command 'test'
-  doCheck = false;
-
-  meta = with stdenv.lib; {
-    homepage = "http://home.blarg.net/~steveha/pyfeed.html";
-    description = "Tools for syndication feeds";
-  };
-}

pkgs/top-level/python-packages.nix

@@ -16258,8 +16258,6 @@ in {
      };
    };
 
-  pyfeed = callPackage ../development/python-modules/pyfeed { };
-
   pyfftw = callPackage ../development/python-modules/pyfftw { };
 
   pyfiglet = callPackage ../development/python-modules/pyfiglet { };
@@ -21547,26 +21545,6 @@ EOF
 
   widgetsnbextension = callPackage ../development/python-modules/widgetsnbextension { };
 
-
-  wokkel = buildPythonPackage (rec {
-    url = "http://wokkel.ik.nu/releases/0.7.0/wokkel-0.7.0.tar.gz";
-    name = nameFromURL url ".tar";
-    src = pkgs.fetchurl {
-      inherit url;
-      sha256 = "0rnshrzw8605x05mpd8ndrx3ri8h6cx713mp8sl4f04f4gcrz8ml";
-    };
-
-    disabled = isPy3k;
-
-    propagatedBuildInputs = with self; [twisted dateutil];
-
-    meta = {
-      description = "Some (mainly XMPP-related) additions to twisted";
-      homepage = "http://wokkel.ik.nu/";
-      license = licenses.mit;
-    };
-  });
-
   magic-wormhole = callPackage ../development/python-modules/magic-wormhole { };
 
   wsgiproxy2 = buildPythonPackage rec {
@@ -21607,23 +21585,6 @@ EOF
     propagatedBuildInputs = with self; [ eventlib application ];
   };
 
-  xe = buildPythonPackage rec {
-    url = "http://www.blarg.net/%7Esteveha/xe-0.7.4.tar.gz";
-    name = stdenv.lib.nameFromURL url ".tar";
-    src = pkgs.fetchurl {
-      inherit url;
-      sha256 = "0v9878cl0y9cczdsr6xjy8v9l139lc23h4m5f86p4kpf2wlnpi42";
-    };
-
-    # error: invalid command 'test'
-    doCheck = false;
-
-    meta = {
-      homepage = "http://home.blarg.net/~steveha/xe.html";
-      description = "XML elements";
-    };
-  };
-
   xlib = buildPythonPackage (rec {
     name = "xlib-${version}";
     version = "0.17";