python.pkgs.graphviz: hardcode path to graphviz's bin/

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

@@ -1,25 +1,51 @@
-{ stdenv
+{ lib
 , buildPythonPackage
-, fetchPypi
-, pkgs
+, fetchFromGitHub
+, substituteAll
+, graphviz
+, makeFontsConf
+, freefont_ttf
+, mock
+, pytest
+, pytest-mock
+, pytestcov
 }:
 
 buildPythonPackage rec {
   pname = "graphviz";
   version = "0.10.1";
 
-  src = fetchPypi {
-    inherit pname version;
-    extension = "zip";
-    sha256 = "d311be4fddfe832a56986ac5e1d6e8715d7fcb0208560da79d1bb0f72abef41f";
+  # patch does not apply to PyPI tarball due to different line endings
+  src = fetchFromGitHub {
+    owner = "xflr6";
+    repo = "graphviz";
+    rev = version;
+    sha256 = "1vqk4xy45c72la56j24z9jmjp5a0aa2k32fybnlbkzqjvvbl72d8";
   };
 
-  propagatedBuildInputs = [ pkgs.graphviz ];
+  patches = [
+    (substituteAll {
+      src = ./hardcode-graphviz-path.patch;
+      inherit graphviz;
+    })
+  ];
 
-  meta = with stdenv.lib; {
+  # Fontconfig error: Cannot load default config file 
+  FONTCONFIG_FILE = makeFontsConf { 
+    fontDirectories = [ freefont_ttf ]; 
+  };
+
+  checkInputs = [ mock pytest pytest-mock pytestcov ];
+
+  checkPhase = ''
+    pytest
+  '';
+
+  meta = with lib; {
     description = "Simple Python interface for Graphviz";
     homepage = https://github.com/xflr6/graphviz;
     license = licenses.mit;
+    maintainers = with maintainers; [ dotlambda ];
   };
 
 }