ProjectExplorer: Reduce qmake specific logic

- add a QString FileNode::buildKey(), returning the build key
  for a build represented by that node, if any.

     * for QmakeProFileNodes the build key is traditionally equal
       to the file name, so use that.

     * for QbsProductNode use the uniqueProductName()

- add a Project::findNodeForBuildKey(QString buildKey) convenience
  function searching a Project(!)Node matching that build key.
  That's the only use case there is right now, and I see no reason
  yet to travers all files (yet).

Change-Id: I388c0e06c03111e12d630899d762448e974a5737
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/projectexplorer/project.cpp

@@ -872,6 +872,15 @@ bool Project::hasParsingData() const
     return d->m_hasParsingData;
 }
 
+const ProjectNode *Project::findNodeForBuildKey(const QString &buildKey) const
+{
+    const ProjectNode *result = nullptr;
+    d->m_rootProjectNode->forEachProjectNode([buildKey](const ProjectNode *node) {
+        return node->buildKey() == buildKey;
+    });
+    return result;
+}
+
 ProjectImporter *Project::projectImporter() const
 {
     return nullptr;

src/plugins/projectexplorer/project.h

@@ -171,6 +171,8 @@ public:
     bool isParsing() const;
     bool hasParsingData() const;
 
+    const ProjectNode *findNodeForBuildKey(const QString &buildKey) const;
+
     template<typename S, typename R, typename T, typename ...Args1, typename ...Args2>
     void subscribeSignal(void (S::*sig)(Args1...), R*recv, T (R::*sl)(Args2...)) {
         new Internal::ProjectSubscription([sig, recv, sl, this](ProjectConfiguration *pc) {

src/plugins/projectexplorer/projectnodes.h

@@ -145,6 +145,8 @@ public:
     virtual ContainerNode *asContainerNode() { return nullptr; }
     virtual const ContainerNode *asContainerNode() const { return nullptr; }
 
+    virtual QString buildKey() const { return QString(); }
+
     static bool sortByPath(const Node *a, const Node *b);
     void setParentFolderNode(FolderNode *parentFolder);
 

src/plugins/qbsprojectmanager/qbsnodes.cpp

@@ -438,6 +438,11 @@ bool QbsProductNode::renameFile(const QString &filePath, const QString &newFileP
     return prjNode->project()->renameFileInProduct(filePath, newFilePath, m_qbsProductData, grp);
 }
 
+QString QbsProductNode::buildKey() const
+{
+    return QbsProject::uniqueProductName(m_qbsProductData);
+}
+
 // --------------------------------------------------------------------
 // QbsProjectNode:
 // --------------------------------------------------------------------

src/plugins/qbsprojectmanager/qbsnodes.h

@@ -110,6 +110,8 @@ public:
     bool removeFiles(const QStringList &filePaths, QStringList *notRemoved = nullptr) override;
     bool renameFile(const QString &filePath, const QString &newFilePath) override;
 
+    QString buildKey() const override;
+
     const qbs::ProductData qbsProductData() const { return m_qbsProductData; }
 
 private:

src/plugins/qbsprojectmanager/qbsrunconfiguration.cpp

@@ -165,10 +165,8 @@ void QbsRunConfiguration::updateTargetInformation()
 
 bool QbsRunConfiguration::canRunForNode(const Node *node) const
 {
-    if (auto pn = dynamic_cast<const QbsProductNode *>(node)) {
-        const QString uniqueProductName = buildKey();
-        return uniqueProductName == QbsProject::uniqueProductName(pn->qbsProductData());
-    }
+    if (auto pn = dynamic_cast<const QbsProductNode *>(node))
+        return buildKey() == pn->buildKey();
 
     return false;
 }

src/plugins/qmakeprojectmanager/qmakenodes.cpp

@@ -223,6 +223,11 @@ bool QmakeProFileNode::showInSimpleTree() const
     return showInSimpleTree(projectType()) || m_project->rootProjectNode() == this;
 }
 
+QString QmakeProFileNode::buildKey() const
+{
+    return filePath().toString();
+}
+
 QmakeProFile *QmakeProFileNode::proFile() const
 {
     return static_cast<QmakeProFile*>(QmakePriFileNode::priFile());

src/plugins/qmakeprojectmanager/qmakenodes.h

@@ -91,6 +91,8 @@ public:
 
     bool showInSimpleTree() const override;
 
+    QString buildKey() const override;
+
     AddNewInformation addNewInformation(const QStringList &files, Node *context) const override;
 
     QmakeProjectManager::ProjectType projectType() const;