Fix up some issues compiling QT layouts.

Older versions of uic.exe don't support Python, so use pyside2uic if it's available.
Fix creating qt_generated when it doesn't exist.

scripts/zMayaTools/qt_helpers.py

@@ -1,6 +1,6 @@
 import fnmatch, os, maya, sys, subprocess
 from fnmatch import fnmatch
-from zMayaTools import maya_logging, Qt
+from zMayaTools import maya_logging, Qt, util
 import xml.etree.cElementTree as ET
 try:
     from StringIO import StringIO
@@ -9,6 +9,11 @@
 
 log = maya_logging.get_log()
 
+try:
+    import pyside2uic
+except ImportError:
+    pyside2uic = None
+
 def mtime(path):
     try:
         return os.stat(path).st_mtime
@@ -43,6 +48,12 @@ def compile_layout(filename, input_data, output_file):
     QT used to include a module to do this, which for some reason was removed, leaving
     us having to shell out for each file individually and no proper API.
     """
+    # If pyside2uic is available, use it.  Older versions of uic.exe don't support Python.
+    if pyside2uic is not None:
+        with open(output_file, 'w') as output:
+            pyside2uic.compileUi(StringIO(input_data), output)
+        return
+
     # Run uic to compile the file.  Since we modify the file before compiling it, we
     # pass the data through stdin.
     bin_path = '%s/bin/uic' % os.environ['MAYA_LOCATION']
@@ -77,6 +88,9 @@ def compile_all_layouts_in_path(path):
     qt_path = path + '/qt/'
     qt_generated_path = path + '/qt_generated/'
 
+    # Make sure the qt_generated directory exists.
+    util.mkdir_p(qt_generated_path)
+
     # If qt_generated/__init__.py doesn't exist, create it so the directory is treated
     # as a module.  This isn't checked into the source tree so that all of the files in
     # that directory can be safely deleted.