qmlproject: add convenience method to QmlMultiLanguageAspect

Change-Id: I88799aa1c5caa5c967b7c680ef9ddcbdd4b01bf5
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/qmlprojectmanager/qmlmultilanguageaspect.cpp

@@ -30,6 +30,7 @@
 
 #include <projectexplorer/project.h>
 #include <projectexplorer/projectexplorer.h>
+#include <projectexplorer/session.h>
 #include <projectexplorer/target.h>
 
 static bool isMultilanguagePresent()
@@ -125,4 +126,27 @@ void QmlMultiLanguageAspect::fromMap(const QVariantMap &map)
     setLastUsedLanguage(map.value(Constants::LAST_USED_LANGUAGE, "en").toString());
 }
 
+QmlMultiLanguageAspect *QmlMultiLanguageAspect::current()
+{
+    if (auto project = ProjectExplorer::SessionManager::startupProject())
+        return current(project);
+    return {};
+}
+
+QmlMultiLanguageAspect *QmlMultiLanguageAspect::current(ProjectExplorer::Project *project)
+{
+    if (auto target = project->activeTarget())
+        return current(target);
+    return {};
+}
+
+QmlMultiLanguageAspect *QmlMultiLanguageAspect::current(ProjectExplorer::Target *target)
+{
+    if (auto runConfiguration = target->activeRunConfiguration()) {
+        if (auto multiLanguageAspect = runConfiguration->aspect<QmlProjectManager::QmlMultiLanguageAspect>())
+            return multiLanguageAspect;
+    }
+    return {};
+}
+
 } // namespace QmlProjectManager

src/plugins/qmlprojectmanager/qmlmultilanguageaspect.h

@@ -45,6 +45,10 @@ public:
     void toMap(QVariantMap &map) const final;
     void fromMap(const QVariantMap &map) final;
 
+    static QmlMultiLanguageAspect *current();
+    static QmlMultiLanguageAspect *current(ProjectExplorer::Project *project);
+    static QmlMultiLanguageAspect *current(ProjectExplorer::Target *target);
+
 public slots:
     void setLastUsedLanguage(const QString &language);