QmakeProjectManager: Restore incremental re-parsing

This was broken in commit 37aecdd112, where we overlooked that a special
type of IDocument was used that triggers a re-parse of only the affected
part of the project tree. As a result, all changes to a .pri or .pro file
would trigger a re-parse of the entire project.

Fixes: QTCREATORBUG-24572
Change-Id: I480cff4e53cf86a17e1eaac0eb9b32901bc87051
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/project.cpp

@@ -64,7 +64,6 @@
 #include <QFileDialog>
 
 #include <limits>
-#include <memory>
 
 /*!
     \class ProjectExplorer::Project
@@ -357,7 +356,8 @@ void Project::setNeedsInitialExpansion(bool needsExpansion)
     d->m_needsInitialExpansion = needsExpansion;
 }
 
-void Project::setExtraProjectFiles(const QSet<Utils::FilePath> &projectDocumentPaths)
+void Project::setExtraProjectFiles(const QSet<Utils::FilePath> &projectDocumentPaths,
+                                   const DocGenerator docGenerator)
 {
     QSet<Utils::FilePath> uniqueNewFiles = projectDocumentPaths;
     uniqueNewFiles.remove(projectFilePath()); // Make sure to never add the main project file!
@@ -372,8 +372,14 @@ void Project::setExtraProjectFiles(const QSet<Utils::FilePath> &projectDocumentP
         return toRemove.contains(d->filePath());
     });
     for (const Utils::FilePath &p : toAdd) {
-        d->m_extraProjectDocuments.emplace_back(
-            std::make_unique<ProjectDocument>(d->m_document->mimeType(), p, this));
+        if (docGenerator) {
+            std::unique_ptr<Core::IDocument> doc = docGenerator(p);
+            QTC_ASSERT(doc, continue);
+            d->m_extraProjectDocuments.push_back(std::move(doc));
+        } else {
+            d->m_extraProjectDocuments.emplace_back(std::make_unique<ProjectDocument>(
+                                                        d->m_document->mimeType(), p, this));
+        }
     }
 }
 
@@ -802,6 +808,19 @@ bool Project::isKnownFile(const Utils::FilePath &filename) const
                               &element, nodeLessThan);
 }
 
+const Node *Project::nodeForFilePath(const Utils::FilePath &filePath,
+                                     const Project::NodeMatcher &extraMatcher)
+{
+    const FileNode dummy(filePath, FileType::Unknown);
+    const auto range = std::equal_range(d->m_sortedNodeList.cbegin(), d->m_sortedNodeList.cend(),
+            &dummy, &nodeLessThan);
+    for (auto it = range.first; it != range.second; ++it) {
+        if ((*it)->filePath() == filePath && (!extraMatcher || extraMatcher(*it)))
+            return *it;
+    }
+    return nullptr;
+}
+
 void Project::setProjectLanguages(Core::Context language)
 {
     if (d->m_projectLanguages == language)

src/plugins/projectexplorer/project.h

@@ -39,6 +39,7 @@
 #include <QFileSystemModel>
 
 #include <functional>
+#include <memory>
 
 namespace Core { class Context; }
 namespace Utils {
@@ -123,6 +124,8 @@ public:
 
     Utils::FilePaths files(const NodeMatcher &matcher) const;
     bool isKnownFile(const Utils::FilePath &filename) const;
+    const Node *nodeForFilePath(const Utils::FilePath &filePath,
+                                const NodeMatcher &extraMatcher = {});
 
     virtual QVariantMap toMap() const;
 
@@ -159,9 +162,11 @@ public:
 
     void setRootProjectNode(std::unique_ptr<ProjectNode> &&root);
 
-    // Set project files that will be watched and trigger the same callback
+    // Set project files that will be watched and by default trigger the same callback
     // as the main project file.
-    void setExtraProjectFiles(const QSet<Utils::FilePath> &projectDocumentPaths);
+    using DocGenerator = std::function<std::unique_ptr<Core::IDocument>(const Utils::FilePath &)>;
+    void setExtraProjectFiles(const QSet<Utils::FilePath> &projectDocumentPaths,
+                              const DocGenerator docGenerator = {});
 
     void setDisplayName(const QString &name);
     void setProjectLanguage(Utils::Id id, bool enabled);

src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp

@@ -63,41 +63,6 @@ using namespace QmakeProjectManager::Internal;
 using namespace QMakeInternal;
 using namespace Utils;
 
-namespace {
-
-class QmakePriFileDocument : public Core::IDocument
-{
-public:
-    QmakePriFileDocument(QmakePriFile *qmakePriFile, const Utils::FilePath &filePath) :
-        IDocument(nullptr), m_priFile(qmakePriFile)
-    {
-        setId("Qmake.PriFile");
-        setMimeType(QLatin1String(QmakeProjectManager::Constants::PROFILE_MIMETYPE));
-        setFilePath(filePath);
-    }
-
-    ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const override
-    {
-        Q_UNUSED(state)
-        Q_UNUSED(type)
-        return BehaviorSilent;
-    }
-    bool reload(QString *errorString, ReloadFlag flag, ChangeType type) override
-    {
-        Q_UNUSED(errorString)
-        Q_UNUSED(flag)
-        if (type == TypePermissions)
-            return true;
-        m_priFile->scheduleUpdate();
-        return true;
-    }
-
-private:
-    QmakePriFile *m_priFile;
-};
-
-} // namespace
-
 namespace QmakeProjectManager {
 
 static Q_LOGGING_CATEGORY(qmakeParse, "qtc.qmake.parsing", QtWarningMsg);

src/plugins/qmakeprojectmanager/qmakeproject.cpp

@@ -33,6 +33,7 @@
 #include "qmakeprojectmanagerconstants.h"
 #include "qmakestep.h"
 
+#include <coreplugin/documentmanager.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/icontext.h>
 #include <coreplugin/icore.h>
@@ -98,6 +99,38 @@ static Q_LOGGING_CATEGORY(qmakeBuildSystemLog, "qtc.qmake.buildsystem", QtWarnin
             << msg;                                                  \
     }
 
+class QmakePriFileDocument : public Core::IDocument
+{
+public:
+    QmakePriFileDocument(QmakePriFile *qmakePriFile, const Utils::FilePath &filePath) :
+        IDocument(nullptr), m_priFile(qmakePriFile)
+    {
+        setId("Qmake.PriFile");
+        setMimeType(QLatin1String(QmakeProjectManager::Constants::PROFILE_MIMETYPE));
+        setFilePath(filePath);
+        Core::DocumentManager::addDocument(this);
+    }
+
+    ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const override
+    {
+        Q_UNUSED(state)
+        Q_UNUSED(type)
+        return BehaviorSilent;
+    }
+    bool reload(QString *errorString, ReloadFlag flag, ChangeType type) override
+    {
+        Q_UNUSED(errorString)
+        Q_UNUSED(flag)
+        if (type == TypePermissions)
+            return true;
+        m_priFile->scheduleUpdate();
+        return true;
+    }
+
+private:
+    QmakePriFile *m_priFile;
+};
+
 /// Watches folders for QmakePriFile nodes
 /// use one file system watcher to watch all folders
 /// such minimizing system ressouce usage
@@ -270,8 +303,17 @@ void QmakeBuildSystem::updateDocuments()
     QSet<FilePath> projectDocuments;
     project()->rootProjectNode()->forEachProjectNode([&projectDocuments](const ProjectNode *n) {
         projectDocuments.insert(n->filePath());
+
+    });
+    project()->setExtraProjectFiles(projectDocuments, [p = project()](const FilePath &fp)
+            -> std::unique_ptr<Core::IDocument> {
+        const Node * const n = p->nodeForFilePath(fp, [](const Node *n) {
+            return dynamic_cast<const QmakePriFileNode *>(n); });
+        QTC_ASSERT(n, return std::make_unique<Core::IDocument>());
+        QmakePriFile * const priFile = static_cast<const QmakePriFileNode *>(n)->priFile();
+        QTC_ASSERT(priFile, return std::make_unique<Core::IDocument>());
+        return std::make_unique<QmakePriFileDocument>(priFile, fp);
     });
-    project()->setExtraProjectFiles(projectDocuments);
 }
 
 void QmakeBuildSystem::updateCppCodeModel()