[FEATURE] Applied patch #2541 - initial implementing the canBeUninstalled python plugin method

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@13050 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: borysiasty

python/utils.py

@@ -161,6 +161,22 @@ def startPlugin(packageName):
   return True
 
 
+def canUninstallPlugin(packageName):
+  """ confirm that the plugin can be uninstalled """
+  global plugins, active_plugins
+
+  if not plugins.has_key(packageName): return False
+  if packageName not in active_plugins: return False
+
+  try:
+    metadata = plugins[packageName]
+    if "canBeUninstalled" not in dir(metadata):
+      return True
+    return bool(metadata.canBeUninstalled())
+  except:
+    return False
+
+
 def unloadPlugin(packageName):
   """ unload and delete plugin! """
   global plugins, active_plugins

src/app/qgspluginmanager.cpp

@@ -407,9 +407,12 @@ void QgsPluginManager::unload()
       {
         if ( mPythonUtils && mPythonUtils->isEnabled() )
         {
-          mPythonUtils->unloadPlugin( baseName );
-          //disable it to the qsettings file
-          settings.setValue( "/PythonPlugins/" + baseName, false );
+          if( mPythonUtils->canUninstallPlugin( baseName ) )
+          {
+            mPythonUtils->unloadPlugin( baseName );
+            //disable it to the qsettings file
+            settings.setValue( "/PythonPlugins/" + baseName, false );
+          }
         }
       }
       else // C++ plugin

src/python/qgspythonutils.h

@@ -81,6 +81,9 @@ class PYTHON_EXPORT QgsPythonUtils
     //! @param function one of these strings: name, tpye, version, description
     virtual QString getPluginMetadata( QString pluginName, QString function ) = 0;
 
+    //! confirm that the plugin can be uninstalled
+    virtual bool canUninstallPlugin( QString packageName ) = 0;
+
     //! unload plugin
     virtual bool unloadPlugin( QString packageName ) = 0;
 };

src/python/qgspythonutilsimpl.cpp

@@ -406,22 +406,26 @@ QString QgsPythonUtilsImpl::getPluginMetadata( QString pluginName, QString funct
   return res;
 }
 
-
 bool QgsPythonUtilsImpl::loadPlugin( QString packageName )
 {
   QString output;
   evalString( "qgis.utils.loadPlugin('" + packageName + "')", output );
   return ( output == "True" );
 }
 
-
 bool QgsPythonUtilsImpl::startPlugin( QString packageName )
 {
   QString output;
   evalString( "qgis.utils.startPlugin('" + packageName + "')", output );
   return ( output == "True" );
 }
 
+bool QgsPythonUtilsImpl::canUninstallPlugin( QString packageName )
+{
+  QString output;
+  evalString( "qgis.utils.canUninstallPlugin('" + packageName + "')", output );
+  return ( output == "True" );
+}
 
 bool QgsPythonUtilsImpl::unloadPlugin( QString packageName )
 {

src/python/qgspythonutilsimpl.h

@@ -98,6 +98,9 @@ class QgsPythonUtilsImpl : public QgsPythonUtils
     //! @param function one of these strings: name, tpye, version, description
     QString getPluginMetadata( QString pluginName, QString function );
 
+    //! confirm it is safe to uninstall the plugin
+    bool canUninstallPlugin( QString packageName );    
+
     //! unload plugin
     bool unloadPlugin( QString packageName );