Added initial cut at plugin query code

applications/osgconv/PluginQuery.cpp

@@ -0,0 +1,41 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2008 Robert Osfield 
+ *
+ * This application is open source and may be redistributed and/or modified   
+ * freely and without restriction, both in commericial and non commericial applications,
+ * as long as this copyright notice is maintained.
+ * 
+ * This application is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+*/
+
+#include <osgDB/FileUtils>
+#include <osg/Version>
+
+#include "PluginQuery.h"
+
+using namespace osgDB;
+
+FileNameList osgDB::listAllAvailablePlugins()
+{
+    FileNameList pluginFiles;
+
+    std::string pluginDirectoryName = std::string("osgPlugins-")+std::string(osgGetVersion());
+    std::string fullPath = osgDB::findLibraryFile(pluginDirectoryName);
+    if (!fullPath.empty())
+    {
+        osgDB::DirectoryContents contents = getDirectoryContents(fullPath);
+        for(DirectoryContents::iterator itr = contents.begin();
+            itr != contents.end();
+            ++itr)
+        {
+            std::string::size_type pos = itr->find("osgdb_");
+            if (pos!=std::string::npos)
+            {
+                pluginFiles.push_back(fullPath + std::string("/")+*itr);
+            }
+        }
+    }
+    
+    return pluginFiles;
+}