python.pkgs.discid: move to separate expression

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

@@ -0,0 +1,24 @@
+{ stdenv, libdiscid, buildPythonPackage, fetchPypi }:
+
+buildPythonPackage rec {
+  pname = "discid";
+  version = "1.1.0";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "b39d443051b26d0230be7a6c616243daae93337a8711dd5d4119bb6a0e516fa8";
+  };
+
+  patchPhase = ''
+    substituteInPlace discid/libdiscid.py \
+      --replace '_open_library(_LIB_NAME)' "_open_library('${libdiscid}/lib/libdiscid.so.0')"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Python binding of libdiscid";
+    homepage    = "https://python-discid.readthedocs.org/";
+    license     = licenses.lgpl3Plus;
+    platforms   = platforms.linux;
+  };
+}

pkgs/top-level/python-packages.nix

@@ -136,26 +136,7 @@ in {
     dbus = pkgs.dbus;
   };
 
-  discid = buildPythonPackage rec {
+  discid = callPackage ../development/python-modules/discid { };
-    name = "discid-1.1.0";
-
-    meta = {
-      description = "Python binding of libdiscid";
-      homepage    = "https://python-discid.readthedocs.org/";
-      license     = licenses.lgpl3Plus;
-      platforms   = platforms.linux;
-    };
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/d/discid/${name}.tar.gz";
-      sha256 = "b39d443051b26d0230be7a6c616243daae93337a8711dd5d4119bb6a0e516fa8";
-    };
-
-    patchPhase = ''
-      substituteInPlace discid/libdiscid.py \
-        --replace '_open_library(_LIB_NAME)' "_open_library('${pkgs.libdiscid}/lib/libdiscid.so.0')"
-    '';
-  };
 
   discordpy = callPackage ../development/python-modules/discordpy { };