Clang: add globalFollowSymbol to RefactoringEngine

Allows to follow outside of current TU.

Change-Id: Ieea2fd72bfdf6d60a988b40efcf2f41c5a71d045
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/clangrefactoring/refactoringengine.cpp

@@ -35,6 +35,7 @@
 
 #include <clangsupport/filepathcachinginterface.h>
 
+#include <utils/algorithm.h>
 #include <utils/textutils.h>
 
 #include <QTextCursor>
@@ -115,6 +116,24 @@ void RefactoringEngine::findUsages(const CppTools::CursorInEditor &data,
     showUsagesCallback(locationsAt(data));
 }
 
+RefactoringEngine::Link RefactoringEngine::globalFollowSymbol(const CppTools::CursorInEditor &data,
+                                                              const CPlusPlus::Snapshot &,
+                                                              const CPlusPlus::Document::Ptr &,
+                                                              CppTools::SymbolFinder *,
+                                                              bool) const
+{
+    // TODO: replace that with specific followSymbol query
+    const CppTools::Usages usages = locationsAt(data);
+    CppTools::Usage usage = Utils::findOrDefault(usages, [&data](const CppTools::Usage &usage) {
+        // We've already searched in the current file, skip it.
+        if (usage.path == data.filePath().toString())
+            return false;
+        return true;
+    });
+
+    return Link(usage.path, usage.line, usage.column);
+}
+
 bool RefactoringEngine::isRefactoringEngineAvailable() const
 {
     return m_server.isAvailable();