CMake: Allow cancellation of CMake process

Allow cancellation of cmake runs in tea-leaf and fileapi modes.

At least in those modes cmake can now get stopped when it goes into
an infinite loop.

Change-Id: I4e9bd769292325b9837904cd391ff61dbc477898
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmakeprocess.cpp

@@ -38,6 +38,7 @@
 
 #include <QDir>
 #include <QObject>
+#include <QTimer>
 
 namespace CMakeProjectManager {
 namespace Internal {
@@ -57,8 +58,11 @@ static QString lineSplit(const QString &rest, const QByteArray &array, std::func
     return tmp.mid(start);
 }
 
-
-CMakeProcess::CMakeProcess() = default;
+CMakeProcess::CMakeProcess()
+{
+    connect(&m_cancelTimer, &QTimer::timeout, this, &CMakeProcess::checkForCancelled);
+    m_cancelTimer.setInterval(500);
+}
 
 CMakeProcess::~CMakeProcess()
 {
@@ -116,6 +120,10 @@ void CMakeProcess::run(const BuildDirParameters &parameters, const QStringList &
     // then we are racing against CMakeCache.txt also getting deleted.
 
     auto process = std::make_unique<Utils::QtcProcess>();
+    m_processWasCanceled = false;
+
+    m_cancelTimer.start();
+
     process->setWorkingDirectory(workDirectory.toString());
     process->setEnvironment(parameters.environment);
 
@@ -204,14 +212,21 @@ void CMakeProcess::handleProcessFinished(int code, QProcess::ExitStatus status)
 {
     QTC_ASSERT(m_process && m_future, return);
 
+    m_cancelTimer.stop();
+
     processStandardOutput();
     processStandardError();
 
     QString msg;
-    if (status != QProcess::NormalExit)
-        msg = tr("*** cmake process crashed.");
-    else if (code != 0)
+    if (status != QProcess::NormalExit) {
+        if (m_processWasCanceled) {
+            msg = tr("*** cmake process was canceled by the user.");
+        } else {
+            msg = tr("*** cmake process crashed.");
+        }
+    } else if (code != 0) {
         msg = tr("*** cmake process exited with exit code %1.").arg(code);
+    }
 
     if (!msg.isEmpty()) {
         Core::MessageManager::write(msg);
@@ -226,5 +241,17 @@ void CMakeProcess::handleProcessFinished(int code, QProcess::ExitStatus status)
     emit finished(code, status);
 }
 
+void CMakeProcess::checkForCancelled()
+{
+    if (!m_process || !m_future)
+        return;
+
+    if (m_future->isCanceled()) {
+        m_cancelTimer.stop();
+        m_processWasCanceled = true;
+        m_process->close();
+    }
+}
+
 } // namespace Internal
 } // namespace CMakeProjectManager

src/plugins/cmakeprojectmanager/cmakeprocess.h

@@ -32,6 +32,7 @@
 #include <utils/qtcprocess.h>
 
 #include <QFutureInterface>
+#include <QTimer>
 
 #include <memory>
 
@@ -67,10 +68,13 @@ signals:
 
 private:
     void handleProcessFinished(int code, QProcess::ExitStatus status);
+    void checkForCancelled();
 
     std::unique_ptr<Utils::QtcProcess> m_process;
     std::unique_ptr<ProjectExplorer::IOutputParser> m_parser;
     std::unique_ptr<QFutureInterface<void>> m_future;
+    bool m_processWasCanceled = false;
+    QTimer m_cancelTimer;
 };
 
 } // namespace Internal