openslide: Initial packaging (includes python interface)

* Add upstream commit 4ea9211 for Pillow issue 2259

openslide/python.nix

@@ -0,0 +1,39 @@
+with import <nixpkgs> {};
+
+let
+
+  openslide = import ./default.nix;
+
+in
+
+  python27Packages.buildPythonPackage rec {
+    version = "1.1.1";
+    name = "openslide-python-${version}";
+
+    src = fetchFromGitHub {
+      owner = "openslide";
+      repo = "openslide-python";
+      rev = "v${version}";
+      sha256 = "1is8g8vy8s1xgfw8q76gdx8ygwvj56cl0vxfd3lx0iys15wzs7a4";
+    };
+
+    patches = [ ./zero-size-test-skip.patch ];
+
+    postPatch = ''
+      sed -i 's|LoadLibrary('\'''libopenslide.so.0'\''')|LoadLibrary('\'''${openslide}/lib/libopenslide.so.0'\''')|' openslide/lowlevel.py
+    '';
+
+    buildInputs = [
+      openslide
+    ];
+
+    propagatedBuildInputs = [
+      python27Packages.pillow
+    ];
+
+    meta = {
+      homepage = "http://openslide.org";
+      description = "Python bindings for OpenSlide.";
+      license = licenses.lgpl2;
+    };
+  }