Making ocropus-hocr run (matplotlib + gdk backend)

I added the gtk backend to matplotlib; if these added dependencies are
too much, we can make this optional.

pkgs/applications/misc/ocropus/default.nix

@@ -44,6 +44,8 @@ pythonPackages.buildPythonPackage rec {
     sha256 = "1s0v0gd6psfjp6lghwl2dj49h18mgf2n2z8hqzw8430nzhglnlvr";
   };
 
+  patches = [ ./display.patch ];
+
   propagatedBuildInputs = with pythonPackages; [ curl numpy scipy pillow
     matplotlib beautifulsoup4 pygtk ];
 
@@ -51,6 +53,9 @@ pythonPackages.buildPythonPackage rec {
   
   preConfigure = with stdenv.lib; ''
     ${concatStrings (map (x: "ln -s ${x.src} models/${x.name};") models)}
+
+    sed -i 's|/usr/local|'$out'|' ocrolib/common.py
+    sed -i 's|/usr/local|'$out'|' ocrolib/default.py
     ${pythonPackages.python}/bin/${pythonPackages.python.executable} setup.py download_models
   '';
 

pkgs/applications/misc/ocropus/display.patch

@@ -0,0 +1,17 @@
+http://code.google.com/p/ocropus/issues/detail?id=365
+
+diff --git a/setup.py b/setup.py
+index c6ade25..a2ad6bf 100644
+--- a/setup.py
++++ b/setup.py
+@@ -8,7 +8,10 @@ assert sys.version_info[0]==2 and sys.version_info[1]>=7,\
+ from distutils.core import setup, Extension, Command
+ from distutils.command.install_data import install_data
+ 
++import matplotlib
++matplotlib.use('Agg')
+ from ocrolib import default
++
+ modeldir = "models/"
+ modelfiles = default.installable
+ modelprefix = "http://iupr1.cs.uni-kl.de/~tmb/ocropus-models/"

pkgs/top-level/python-packages.nix

@@ -3963,7 +3963,8 @@ rec {
         (if stdenv.isDarwin then [ pkgs.clangStdenv ] else [ pkgs.stdenv ]);
 
     propagatedBuildInputs =
-      [ dateutil nose numpy pyparsing tornado pkgs.freetype pkgs.libpng pkgs.pkgconfig ];
+      [ dateutil nose numpy pyparsing tornado pkgs.freetype pkgs.libpng pkgs.pkgconfig
+        pygtk ];
 
     meta = with stdenv.lib; {
       description = "python plotting library, making publication quality plots";