Add CurrentProject:VcsTopLevelPath as a variable.

Change-Id: I46ed1c0711cc9cc23f82628e8e9dcd82b1112fad
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/vcsbase/vcsbaseconstants.h

@@ -51,6 +51,7 @@ const char VCS_ID_CVS[] = "Z.CVS";
 
 const char VAR_VCS_NAME[] = "CurrentProject:VcsName";
 const char VAR_VCS_TOPIC[] = "CurrentProject:VcsTopic";
+const char VAR_VCS_TOPLEVELPATH[] = "CurrentProject:VcsTopLevelPath";
 
 } // namespace Constants
 } // namespace VcsBase

src/plugins/vcsbase/vcsplugin.cpp

@@ -90,6 +90,8 @@ bool VcsPlugin::initialize(const QStringList &arguments, QString *errorMessage)
         tr("Name of the version control system in use by the current project."));
     Core::VariableManager::registerVariable(Constants::VAR_VCS_TOPIC,
         tr("The current version control topic (branch or tag) identification of the current project."));
+    Core::VariableManager::registerVariable(Constants::VAR_VCS_TOPLEVELPATH,
+        tr("The top level path to the repository the current project is in."));
 
     return true;
 }
@@ -167,6 +169,11 @@ void VcsPlugin::updateVariable(const QByteArray &variable)
             Core::VariableManager::insert(variable, cachedVc->vcsTopic(cachedTopLevel));
         else
             Core::VariableManager::remove(variable);
+    } else if (variable == Constants::VAR_VCS_TOPLEVELPATH) {
+        if (cachedVc)
+            Core::VariableManager::insert(variable, cachedTopLevel);
+        else
+            Core::VariableManager::remove(variable);
     }
 }