Improve python_tqt module initialization

This relates to bug 2693

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 0b2f1c4760)

configure.py

@@ -1458,14 +1458,15 @@ def main(argv):
     # Create the additional Makefiles.
     sipconfig.inform("Creating top level Makefile...")
 
-    open('__init__.py', 'a').close()
-
     sipconfig.ParentMakefile(
         configuration=sipcfg,
         subdirs=pyqt_modules + pyqt.tools(),
         installs=(pyqt.module_installs(), pyqt.module_dir())
     ).generate()
 
+    # Install module initialization script.
+    create_config("__init__.py", os.path.join(src_dir, "module-init.py"), macros)
+
     # Install the configuration module.
     create_config("pyqtconfig.py", os.path.join(src_dir, "pyqtconfig.py.in"), macros)
 

module-init.py

@@ -0,0 +1,35 @@
+
+# Trinity-specific paths
+import sys, os
+tqt_modules = []
+for m_path in sys.path:
+    if os.path.exists(os.path.join(m_path, 'sip4_tqt')):
+        m_sip_dir = os.path.join(m_path, 'sip4_tqt')
+        tqt_modules.insert(0, m_sip_dir)
+    if os.path.exists(os.path.join(m_path, 'python_tqt')):
+        m_pyqt_dir = os.path.join(m_path, 'python_tqt')
+        tqt_modules.insert(0, m_pyqt_dir)
+for m_path in tqt_modules:
+    sys.path.insert(0, m_path)
+
+# Base modules
+__all__ = [
+ 'qt',
+ 'qtcanvas',
+ 'qtnetwork',
+ 'qtsql',
+ 'qttable',
+ 'qtui',
+ 'qtxml',
+]
+
+# Optional modules
+if os.path.exists(os.path.join(m_pyqt_dir, 'qtaxcontainer.so')):
+    __all__.append('qtaxcontainer')
+if os.path.exists(os.path.join(m_pyqt_dir, 'qtext.so')):
+    __all__.append('qtext')
+if os.path.exists(os.path.join(m_pyqt_dir, 'qtgl.so')):
+    __all__.append('qtgl')
+
+# Import namespaces
+from python_tqt import *