python.pkgs.dot2tex: enable python3 and run tests

pkgs/development/python-modules/dot2tex/default.nix

@@ -1,8 +1,11 @@
 { stdenv
+, python
 , buildPythonPackage
 , fetchPypi
-, isPy3k
+, substituteAll
 , pyparsing
+, graphviz
+, texlive
 }:
 
 buildPythonPackage rec {
@@ -14,11 +17,26 @@ buildPythonPackage rec {
     sha256 = "1kp77wiv7b5qib82i3y3sn9r49rym43aaqm5aw1bwnzfbbq2m6i9";
   };
 
-  # Tests fail with 3.x. Furthermore, package is no longer maintained.
-  disabled = isPy3k;
+  patches = [
+    (substituteAll {
+      src = ./path.patch;
+      inherit graphviz;
+    })
+    ./test.patch # https://github.com/kjellmf/dot2tex/issues/5
+  ];
 
   propagatedBuildInputs = [ pyparsing ];
 
+  checkInputs = [
+    (texlive.combine {
+      inherit (texlive) scheme-small preview pstricks;
+    })
+  ];
+
+  checkPhase = ''
+    ${python.interpreter} tests/test_dot2tex.py
+  '';
+
   meta = with stdenv.lib; {
     description = "Convert graphs generated by Graphviz to LaTeX friendly formats";
     homepage = "https://github.com/kjellmf/dot2tex";

pkgs/development/python-modules/dot2tex/path.patch

@@ -0,0 +1,104 @@
+diff --git a/dot2tex/dotparsing.py b/dot2tex/dotparsing.py
+index 391b5dc..6dc77a3 100644
+--- a/dot2tex/dotparsing.py
++++ b/dot2tex/dotparsing.py
+@@ -180,18 +180,8 @@ def __find_executables(path):
+ def find_graphviz():
+     """Locate Graphviz's executables in the system.
+ 
+-    Tries three methods:
+-
+-    First: Windows Registry (Windows only)
+-    This requires Mark Hammond's pywin32 is installed.
+-
+-    Secondly: Search the path
+-    It will look for 'dot', 'twopi' and 'neato' in all the directories
+-    specified in the PATH environment variable.
+-
+-    Thirdly: Default install location (Windows only)
+-    It will look for 'dot', 'twopi' and 'neato' in the default install
+-    location under the "Program Files" directory.
++    It will look for 'dot', 'twopi' and 'neato' in
++    @graphviz@/bin.
+ 
+     It will return a dictionary containing the program names as keys
+     and their paths as values.
+@@ -199,75 +189,9 @@ def find_graphviz():
+     If this fails, it returns None.
+     """
+ 
+-    # Method 1 (Windows only)
+-    #
+-    if os.sys.platform == 'win32':
+-        try:
+-            import win32api, win32con
+-
+-            # Get the GraphViz install path from the registry
+-            #
+-            hkey = win32api.RegOpenKeyEx(win32con.HKEY_LOCAL_MACHINE,
+-                                         "SOFTWARE\AT&T Research Labs\Graphviz", 0, win32con.KEY_QUERY_VALUE)
+-
+-            path = win32api.RegQueryValueEx(hkey, "InstallPath")[0]
+-            win32api.RegCloseKey(hkey)
+-
+-            # Now append the "bin" subdirectory:
+-            #
+-            path = os.path.join(path, "bin")
+-            progs = __find_executables(path)
+-            if progs is not None:
+-                # print("Used Windows registry")
+-                return progs
+-
+-        except ImportError:
+-            # Print a messaged suggesting they install these?
+-            #
+-            log.debug('The win32api is not installed')
+-            pass
+-        except:
+-            log.debug('Failed to access the registry key')
+-
+-    # Method 2 (Linux, Windows etc)
+-    #
+-    if 'PATH' in os.environ:
+-        for path in os.environ['PATH'].split(os.pathsep):
+-            progs = __find_executables(path)
+-            if progs is not None:
+-                return progs
+-
+-    # Method 3 (Windows only)
+-    #
+-    if os.sys.platform == 'win32':
+-        # Try and work out the equivalent of "C:\Program Files" on this
+-        # machine (might be on drive D:, or in a different language)
+-        #
+-        if 'PROGRAMFILES' in os.environ:
+-            # Note, we could also use the win32api to get this
+-            # information, but win32api may not be installed.
+-
+-            path = os.path.join(os.environ['PROGRAMFILES'], 'ATT', 'GraphViz', 'bin')
+-
+-        else:
+-            # Just in case, try the default...
+-            path = r"C:\Program Files\att\Graphviz\bin"
+-
+-        progs = __find_executables(path)
+-
+-        if progs is not None:
+-            # print("Used default install location")
+-            return progs
+-
+-    for path in (
+-            '/usr/bin', '/usr/local/bin',
+-            '/opt/local/bin',
+-            '/opt/bin', '/sw/bin', '/usr/share',
+-            '/Applications/Graphviz.app/Contents/MacOS/'):
+-        progs = __find_executables(path)
+-        if progs is not None:
+-            # print("Used path")
+-            return progs
++    progs = __find_executables('@graphviz@/bin')
++    if progs is not None:
++        return progs
+ 
+     # Failed to find GraphViz
+     #

pkgs/development/python-modules/dot2tex/test.patch

@@ -0,0 +1,12 @@
+diff --git a/tests/test_dot2tex.py b/tests/test_dot2tex.py
+index 74b01ed..7be9aba 100644
+--- a/tests/test_dot2tex.py
++++ b/tests/test_dot2tex.py
+@@ -147,6 +147,7 @@ class NeedsQuotesTests(unittest.TestCase):
+ 
+ class MultipleStatements(unittest.TestCase):
+     # https://github.com/kjellmf/dot2tex/issues/5
++    @unittest.skip('fails upstream')
+     def test_semicolon(self):
+         """Test for issue 5"""
+         testgraph1 = """

pkgs/top-level/python-packages.nix

@@ -6773,7 +6773,9 @@ in {
 
   jenkins-job-builder = callPackage ../development/python-modules/jenkins-job-builder { };
 
-  dot2tex = callPackage ../development/python-modules/dot2tex { };
+  dot2tex = callPackage ../development/python-modules/dot2tex {
+    inherit (pkgs) graphviz;
+  };
 
   poezio = callPackage ../applications/networking/instant-messengers/poezio {
     inherit (pkgs) pkgconfig;