CMake: Keep cmake state in a temporary directory till first build

This avoids creating lots of build directories as the user types
in something into the builddirectory line of the build settings.

Change-Id: Ib08a0f65e08bce104e4baf9e19fb01730d2f5f08
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/cmakeprojectmanager/builddirmanager.cpp

@@ -100,7 +100,7 @@ BuildDirManager::BuildDirManager(const CMakeBuildConfiguration *bc) :
 
     m_reparseTimer.setSingleShot(true);
     m_reparseTimer.setInterval(500);
-    connect(&m_reparseTimer, &QTimer::timeout, this, &BuildDirManager::forceReparse);
+    connect(&m_reparseTimer, &QTimer::timeout, this, &BuildDirManager::parse);
 
     connect(m_watcher, &QFileSystemWatcher::fileChanged, this, [this]() {
         if (!isParsing())
@@ -111,6 +111,7 @@ BuildDirManager::BuildDirManager(const CMakeBuildConfiguration *bc) :
 BuildDirManager::~BuildDirManager()
 {
     resetData();
+    delete m_tempDir;
 }
 
 const ProjectExplorer::Kit *BuildDirManager::kit() const
@@ -123,6 +124,16 @@ const Utils::FileName BuildDirManager::buildDirectory() const
     return m_buildConfiguration->buildDirectory();
 }
 
+const Utils::FileName BuildDirManager::workDirectory() const
+{
+    const Utils::FileName bdir = buildDirectory();
+    if (bdir.exists())
+        return bdir;
+    if (m_tempDir)
+        return Utils::FileName::fromString(m_tempDir->path());
+    return bdir;
+}
+
 const Utils::FileName BuildDirManager::sourceDirectory() const
 {
     return m_buildConfiguration->target()->project()->projectDirectory();
@@ -168,6 +179,21 @@ void BuildDirManager::resetData()
         m_watcher->removePaths(watchedFiles);
 }
 
+bool BuildDirManager::persistCMakeState()
+{
+    if (!m_tempDir)
+        return false;
+
+    QDir dir(buildDirectory().toString());
+    dir.mkpath(buildDirectory().toString());
+
+    delete m_tempDir;
+    m_tempDir = nullptr;
+
+    parse();
+    return true;
+}
+
 void BuildDirManager::parse()
 {
     CMakeTool *tool = CMakeKitInformation::cmakeTool(kit());
@@ -177,7 +203,7 @@ void BuildDirManager::parse()
     QTC_ASSERT(!generator.isEmpty(), return);
 
     // Pop up a dialog asking the user to rerun cmake
-    QString cbpFile = CMakeManager::findCbpFile(QDir(buildDirectory().toString()));
+    QString cbpFile = CMakeManager::findCbpFile(QDir(workDirectory().toString()));
     QFileInfo cbpFileFi(cbpFile);
 
     if (!cbpFileFi.exists()) {
@@ -234,7 +260,32 @@ CMakeConfig BuildDirManager::configuration() const
 
 void BuildDirManager::stopProcess()
 {
-    if (m_cmakeProcess) {
+    if (!m_cmakeProcess)
+        return;
+
+    m_cmakeProcess->disconnect();
+
+    if (m_cmakeProcess->state() == QProcess::Running) {
+        m_cmakeProcess->terminate();
+        if (!m_cmakeProcess->waitForFinished(500))
+            m_cmakeProcess->kill();
+    }
+
+    cleanUpProcess();
+
+    m_future->reportCanceled();
+    m_future->reportFinished();
+    delete m_future;
+    m_future = nullptr;
+}
+
+void BuildDirManager::cleanUpProcess()
+{
+    if (!m_cmakeProcess)
+        return;
+
+    QTC_ASSERT(m_cmakeProcess->state() == QProcess::NotRunning, return);
+
     m_cmakeProcess->disconnect();
 
     if (m_cmakeProcess->state() == QProcess::Running) {
@@ -250,7 +301,6 @@ void BuildDirManager::stopProcess()
     delete m_parser;
     m_parser = nullptr;
 }
-}
 
 void BuildDirManager::extractData()
 {
@@ -264,7 +314,7 @@ void BuildDirManager::extractData()
     m_watchedFiles.insert(topCMake);
 
     // Find cbp file
-    QString cbpFile = CMakeManager::findCbpFile(buildDirectory().toString());
+    QString cbpFile = CMakeManager::findCbpFile(workDirectory().toString());
     if (cbpFile.isEmpty())
         return;
 
@@ -301,14 +351,20 @@ void BuildDirManager::startCMake(CMakeTool *tool, const QString &generator,
                                  const CMakeConfig &config)
 {
     QTC_ASSERT(tool && tool->isValid(), return);
+
     QTC_ASSERT(!m_cmakeProcess, return);
     QTC_ASSERT(!m_parser, return);
     QTC_ASSERT(!m_future, return);
 
-    // Make sure m_buildDir exists:
-    const QString buildDirStr = buildDirectory().toString();
-    QDir bDir = QDir(buildDirStr);
-    bDir.mkpath(buildDirStr);
+    // Find a directory to set up into:
+    if (!buildDirectory().exists()) {
+        if (!m_tempDir)
+            m_tempDir = new QTemporaryDir(QDir::tempPath() + QLatin1String("/qtc-cmake-XXXXXX"));
+        QTC_ASSERT(m_tempDir->isValid(), return);
+    }
+
+    // Make sure work directory exists:
+    QTC_ASSERT(workDirectory().exists(), return);
 
     m_parser = new CMakeParser;
     QDir source = QDir(sourceDirectory().toString());
@@ -328,7 +384,7 @@ void BuildDirManager::startCMake(CMakeTool *tool, const QString &generator,
     const QString srcDir = sourceDirectory().toString();
 
     m_cmakeProcess = new Utils::QtcProcess(this);
-    m_cmakeProcess->setWorkingDirectory(buildDirStr);
+    m_cmakeProcess->setWorkingDirectory(workDirectory().toString());
     m_cmakeProcess->setEnvironment(m_buildConfiguration->environment());
 
     connect(m_cmakeProcess, &QProcess::readyReadStandardOutput,
@@ -349,7 +405,7 @@ void BuildDirManager::startCMake(CMakeTool *tool, const QString &generator,
     Core::MessageManager::write(tr("Running '%1 %2' in %3.")
                                 .arg(tool->cmakeExecutable().toUserOutput())
                                 .arg(args)
-                                .arg(buildDirectory().toUserOutput()));
+                                .arg(workDirectory().toUserOutput()));
 
     m_future = new QFutureInterface<void>();
     m_future->setProgressRange(0, 1);
@@ -370,7 +426,7 @@ void BuildDirManager::cmakeFinished(int code, QProcess::ExitStatus status)
     processCMakeOutput();
     processCMakeError();
 
-    stopProcess();
+    cleanUpProcess();
 
     extractData(); // try even if cmake failed...
 
@@ -391,7 +447,7 @@ void BuildDirManager::cmakeFinished(int code, QProcess::ExitStatus status)
 
     m_future->reportFinished();
     delete m_future;
-    m_future = 0;
+    m_future = nullptr;
 
     m_hasData = true;
     emit dataAvailable();
@@ -464,7 +520,7 @@ static CMakeConfigItem::Type fromByteArray(const QByteArray &type) {
 CMakeConfig BuildDirManager::parseConfiguration() const
 {
     CMakeConfig result;
-    const QString cacheFile = QDir(buildDirectory().toString()).absoluteFilePath(QLatin1String("CMakeCache.txt"));
+    const QString cacheFile = QDir(workDirectory().toString()).absoluteFilePath(QLatin1String("CMakeCache.txt"));
     QFile cache(cacheFile);
     if (!cache.open(QIODevice::ReadOnly | QIODevice::Text))
         return CMakeConfig();

src/plugins/cmakeprojectmanager/builddirmanager.h

@@ -69,6 +69,7 @@ public:
 
     const ProjectExplorer::Kit *kit() const;
     const Utils::FileName buildDirectory() const;
+    const Utils::FileName workDirectory() const;
     const Utils::FileName sourceDirectory() const;
     const CMakeConfig cmakeConfiguration() const;
     bool isParsing() const;
@@ -76,6 +77,7 @@ public:
     void parse();
     void forceReparse();
     void resetData();
+    bool persistCMakeState();
 
     bool isProjectFile(const Utils::FileName &fileName) const;
     QString projectName() const;
@@ -91,6 +93,7 @@ signals:
 
 private:
     void stopProcess();
+    void cleanUpProcess();
     void extractData();
 
     void startCMake(CMakeTool *tool, const QString &generator, const CMakeConfig &config);
@@ -105,6 +108,7 @@ private:
 
     const CMakeBuildConfiguration *m_buildConfiguration = nullptr;
     Utils::QtcProcess *m_cmakeProcess = nullptr;
+    QTemporaryDir *m_tempDir = nullptr;
 
     QSet<Utils::FileName> m_watchedFiles;
     QString m_projectName;

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp

@@ -92,7 +92,7 @@ CMakeBuildConfiguration::CMakeBuildConfiguration(ProjectExplorer::Target *parent
     connect(this, &CMakeBuildConfiguration::environmentChanged,
             m_buildDirManager, &BuildDirManager::forceReparse);
     connect(this, &CMakeBuildConfiguration::buildDirectoryChanged,
-            m_buildDirManager, &BuildDirManager::parse);
+            m_buildDirManager, &BuildDirManager::forceReparse);
     connect(target(), &Target::kitChanged, m_buildDirManager, &BuildDirManager::forceReparse);
 
     connect(this, &CMakeBuildConfiguration::parsingStarted, project, &CMakeProject::handleParsingStarted);
@@ -182,6 +182,11 @@ void CMakeBuildConfiguration::resetData()
     m_buildDirManager->resetData();
 }
 
+bool CMakeBuildConfiguration::persistCMakeState()
+{
+    return m_buildDirManager->persistCMakeState();
+}
+
 QList<ConfigModel::DataItem> CMakeBuildConfiguration::completeCMakeConfiguration() const
 {
     if (m_buildDirManager->isParsing())

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.h

@@ -75,6 +75,7 @@ public:
 
     void parse();
     void resetData();
+    bool persistCMakeState();
 
 signals:
     void errorOccured(const QString &message);

src/plugins/cmakeprojectmanager/cmakebuildstep.cpp

@@ -222,6 +222,37 @@ bool CMakeBuildStep::init(QList<const BuildStep *> &earlierSteps)
     return AbstractProcessStep::init(earlierSteps);
 }
 
+void CMakeBuildStep::run(QFutureInterface<bool> &fi)
+{
+    // Make sure CMake state was written to disk before trying to build:
+    CMakeBuildConfiguration *bc = cmakeBuildConfiguration();
+    if (!bc)
+        bc = qobject_cast<CMakeBuildConfiguration *>(target()->activeBuildConfiguration());
+    QTC_ASSERT(bc, return);
+
+    if (bc->persistCMakeState()) {
+        emit addOutput(tr("Persisting CMake state..."), BuildStep::MessageOutput);
+
+        m_runTrigger = connect(bc, &CMakeBuildConfiguration::dataAvailable,
+                               this, [this, &fi]() { runImpl(fi); });
+        m_errorTrigger = connect(bc, &CMakeBuildConfiguration::errorOccured,
+                                 this, [this, &fi]() {
+            fi.reportResult(false);
+        });
+    } else {
+        runImpl(fi);
+    }
+}
+
+void CMakeBuildStep::runImpl(QFutureInterface<bool> &fi)
+{
+    // Do the actual build:
+    disconnect(m_runTrigger);
+    disconnect(m_errorTrigger);
+
+    AbstractProcessStep::run(fi);
+}
+
 BuildStepConfigWidget *CMakeBuildStep::createConfigWidget()
 {
     return new CMakeBuildStepConfigWidget(this);

src/plugins/cmakeprojectmanager/cmakebuildstep.h

@@ -56,6 +56,7 @@ public:
     CMakeBuildConfiguration *targetsActiveBuildConfiguration() const;
 
     bool init(QList<const BuildStep *> &earlierSteps) override;
+    void run(QFutureInterface<bool> &fi) override;
 
     ProjectExplorer::BuildStepConfigWidget *createConfigWidget() override;
     bool immutable() const override;
@@ -100,9 +101,14 @@ protected:
 private:
     void ctor(ProjectExplorer::BuildStepList *bsl);
 
+    void runImpl(QFutureInterface<bool> &fi);
+
     void handleBuildTargetChanges();
     CMakeRunConfiguration *targetsActiveRunConfiguration() const;
 
+    QMetaObject::Connection m_runTrigger;
+    QMetaObject::Connection m_errorTrigger;
+
     QRegExp m_percentProgress;
     QRegExp m_ninjaProgress;
     QString m_ninjaProgressString;