- Add copyright notices to existing builtin python policies

- Implement system to dinamically pass plugins and policies search paths to
the sgpemv2 binary and tests (class GlobalSettings)
- Drastically reduce usage of hardcoded paths in code except as 
default overridable values


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@514 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/pyloader/python_policy_manager.cc

@@ -19,25 +19,50 @@
 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 #include "python_policy_manager.hh"
+#include "../global_settings.hh"
 
 #include <Python.h>
+#include <glibmm/ustring.h>
 #include <glibmm/timer.h>
 
-#include <string>
+#include <algorithm>
 #include <cassert>
+#include <functional>
 #include <iostream>
+#include <string>
 #include <unistd.h>
 using namespace sgpem;
 
+
+
+// Concatenate a string with all the policies directories
+struct pol_dirs_concat : public std::unary_function<void, const Glib::ustring&>
+{
+public:
+    pol_dirs_concat(Glib::ustring& cat) : _cat(cat) {}
+    void operator()(const Glib::ustring& add) 
+	{
+	    // Please note that this string will end finishing with
+	    // and additional ","!
+	    _cat += "'" + add + "', ";
+	}
+private:
+    Glib::ustring& _cat;
+};
+
+
+
 //static object
 PythonPolicyManager* PythonPolicyManager::_instance = NULL;
 
+
 PythonPolicyManager::PythonPolicyManager()
   : _initialized(false)
 {
   PyEval_InitThreads();
 }
 
+
 PythonPolicyManager* const
 PythonPolicyManager::get_instance()
 {
@@ -46,6 +71,7 @@ PythonPolicyManager::get_instance()
   return _instance;
 }
 
+
 Policy&
 PythonPolicyManager::get_policy()
 {
@@ -53,6 +79,7 @@ PythonPolicyManager::get_policy()
     return *_python_policy;
 }
 
+
 void
 PythonPolicyManager::init()
 {
@@ -63,14 +90,20 @@ PythonPolicyManager::init()
   Py_Initialize();
   _initialized = true;
   
-  // The following line is ugly, but necessary if we use 
+  // The following lines are ugly, but necessary if we use 
   // non-standard installation directories. Theoretically,
   // it should be up to the user to set correct 
   // environment variables. 
   // FIXME: find better way to achieve this.
   
-  PyRun_SimpleString("import sys\n"
-		     "sys.path[:0] = [ '" MODDIR "', '" POLDIR "' ]\n");
+  Glib::ustring importdirs = "import sys\n" 
+      "sys.path[:0] = [ ";
+  for_each(GlobalSettings::instance().policies_dir_begin(),
+	   GlobalSettings::instance().policies_dir_end(),
+	   pol_dirs_concat(importdirs));
+  importdirs += " '" MODDIR "' ]\n";
+
+  PyRun_SimpleString(importdirs.c_str());
 
   // Okay, here we go.
   // Black magic at work.