Bugfix: db_plugin modules were not loaded for python modules

* Added unit test for this
* Provided an option for easier debugging such issues:
  Setting env var KLAYOUT_VERBOSITY will enable debug levels on Python
  modules (and all other binaries). Plugin loading issues can
  be debugged by setting KLAYOUT_VERBOSITY=21.

src/pymod/db/dbMain.cc

@@ -22,7 +22,15 @@
 
 #include "../pymodHelper.h"
 
+#include "../../db/db/dbInit.h"
+
 //  to force linking of the db module
 #include "../../db/db/dbForceLink.h"
 
-DEFINE_PYMOD(db, "db", "KLayout core module 'db'")
+static PyObject *db_module_init (const char *mod_name, const char *mod_description)
+{
+  db::init ();
+  return module_init (mod_name, mod_description);
+}
+
+DEFINE_PYMOD_WITH_INIT(db, "db", "KLayout core module 'db'", db_module_init)

src/pymod/pymodHelper.h

@@ -70,6 +70,14 @@ module_init (const char *mod_name, const char *mod_description)
     module_init (__name_str__, __description__); \
   } \
 
+#define DEFINE_PYMOD_WITH_INIT(__name__, __name_str__, __description__, __init__) \
+  extern "C" \
+  DEF_INSIDE_PUBLIC \
+  void init##__name__ () \
+  { \
+    __init__ (__name_str__, __description__); \
+  } \
+
 #else
 
 #define DEFINE_PYMOD(__name__, __name_str__, __description__) \
@@ -80,5 +88,13 @@ module_init (const char *mod_name, const char *mod_description)
     return module_init (__name_str__, __description__); \
   } \
 
+#define DEFINE_PYMOD_WITH_INIT(__name__, __name_str__, __description__, __init__) \
+  extern "C" \
+  DEF_INSIDE_PUBLIC \
+  PyObject *PyInit_##__name__ () \
+  { \
+    return __init__ (__name_str__, __description__); \
+  } \
+
 #endif
 

src/tl/tl/tlLog.cc

@@ -21,19 +21,48 @@
 */
 
 
-#include <stdio.h>
-
 #include "tlLog.h"
+#include "tlString.h"
 
+#include <stdio.h>
 #include <unistd.h>
 
+#if defined(_WIN32)
+#  include <windows.h>
+#endif
+
 namespace tl
 {
 
 // ------------------------------------------------
 //  Verbosity implementation
 
-static int m_verbosity_level = 0;
+static int default_verbosity ()
+{
+  const char *verbosity_str = 0;
+
+#if defined(_WIN32)
+  const wchar_t *verbosity_wstr = _wgetenv (L"KLAYOUT_VERBOSITY"));
+  std::string vs;
+  if (verbosity_wstr) {
+    vs = tl::to_string (std::wstring (verbosity_wstr));
+    verbosity_str = vs.c_str ();
+  }
+#else
+  verbosity_str = getenv ("KLAYOUT_VERBOSITY");
+#endif
+
+  int verbosity = 0;
+  if (verbosity_str) {
+    try {
+      tl::from_string (verbosity_str, verbosity);
+    } catch (...) {
+    }
+  }
+  return verbosity;
+}
+
+static int m_verbosity_level = default_verbosity ();
 
 void 
 verbosity (int level)

testdata/pymod/import_db.py

@@ -19,6 +19,7 @@
 import klayout.db as db
 import unittest
 import sys
+import os
 
 # Tests the basic abilities of the module
 
@@ -34,6 +35,12 @@ class BasicTest(unittest.TestCase):
     v = db.Box(1, 2, 3, 4)
     self.assertEqual(str(v), "(1,2;3,4)")
 
+  def test_3(self):
+    # db plugins loaded?
+    v = db.Layout()
+    v.read(os.path.join(os.path.dirname(__file__), "..", "gds", "t10.gds"))
+    self.assertEqual(v.top_cell().name, "RINGO")
+
 # run unit tests
 if __name__ == '__main__':
   suite = unittest.TestSuite()