Show launcher log also before opening settings dialog

tray/gui/trayicon.cpp

@@ -105,8 +105,8 @@ TrayIcon::TrayIcon(const QString &connectionConfig, QObject *parent)
 #endif
 
     // apply settings, this also establishes the connection to Syncthing (according to settings)
-    // note: It is important to apply settings only after all Signals & Slots have been connected (eg. to handle SyncthingConnection::error()).
-    // note: This weirdly call updateStatusIconAndText(). So there is not need to call it again within this constructor.
+    // note: It is important to apply settings only after all Signals & Slots have been connected (e.g. to handle SyncthingConnection::error()).
+    // note: This weirdly calls updateStatusIconAndText(). So there is not need to call it again within this constructor.
     trayMenu().widget().applySettings(connectionConfig);
 }
 

widgets/misc/syncthinglauncher.cpp

@@ -30,6 +30,7 @@ SyncthingLauncher *SyncthingLauncher::s_mainInstance = nullptr;
 SyncthingLauncher::SyncthingLauncher(QObject *parent)
     : QObject(parent)
     , m_manuallyStopped(true)
+    , m_emittingOutput(false)
 {
     connect(&m_process, &SyncthingProcess::readyRead, this, &SyncthingLauncher::handleProcessReadyRead);
     connect(&m_process, static_cast<void (SyncthingProcess::*)(int exitCode, QProcess::ExitStatus exitStatus)>(&SyncthingProcess::finished), this,
@@ -39,6 +40,19 @@ SyncthingLauncher::SyncthingLauncher(QObject *parent)
     connect(&m_process, &SyncthingProcess::confirmKill, this, &SyncthingLauncher::confirmKill);
 }
 
+/*!
+ * \brief Sets whether the output/log should be emitted via outputAvailable() signal.
+ */
+void SyncthingLauncher::setEmittingOutput(bool emittingOutput)
+{
+    if (m_emittingOutput == emittingOutput || !(m_emittingOutput = emittingOutput) || m_outputBuffer.isEmpty()) {
+        return;
+    }
+    QByteArray data;
+    m_outputBuffer.swap(data);
+    emit outputAvailable(move(data));
+}
+
 /*!
  * \brief Returns whether the built-in Syncthing library is available.
  */
@@ -156,7 +170,7 @@ void SyncthingLauncher::tearDownLibSyncthing()
 
 void SyncthingLauncher::handleProcessReadyRead()
 {
-    emit outputAvailable(m_process.readAll());
+    handleOutputAvailable(m_process.readAll());
 }
 
 void SyncthingLauncher::handleProcessStateChanged(QProcess::ProcessState newState)
@@ -200,7 +214,7 @@ void SyncthingLauncher::handleLoggingCallback(LibSyncthing::LogLevel level, cons
     messageData.append(message, static_cast<int>(messageSize));
     messageData.append('\n');
 
-    emit outputAvailable(move(messageData));
+    handleOutputAvailable(move(messageData));
 #else
     CPP_UTILITIES_UNUSED(level)
     CPP_UTILITIES_UNUSED(message)
@@ -208,6 +222,15 @@ void SyncthingLauncher::handleLoggingCallback(LibSyncthing::LogLevel level, cons
 #endif
 }
 
+void SyncthingLauncher::handleOutputAvailable(QByteArray &&data)
+{
+    if (isEmittingOutput()) {
+        emit outputAvailable(data);
+    } else {
+        m_outputBuffer += data;
+    }
+}
+
 void SyncthingLauncher::runLibSyncthing(const LibSyncthing::RuntimeOptions &runtimeOptions)
 {
 #ifdef SYNCTHINGWIDGETS_USE_LIBSYNCTHING
@@ -218,7 +241,7 @@ void SyncthingLauncher::runLibSyncthing(const LibSyncthing::RuntimeOptions &runt
     emit runningChanged(false);
 #else
     CPP_UTILITIES_UNUSED(runtimeOptions)
-    emit outputAvailable("libsyncthing support not enabled");
+    handleOutputAvailable(QByteArray("libsyncthing support not enabled"));
     emit exited(-1, QProcess::CrashExit);
 #endif
 }

widgets/misc/syncthinglauncher.h

@@ -6,6 +6,7 @@
 #include "../../connector/syncthingprocess.h"
 #include "../../libsyncthing/interface.h"
 
+#include <QByteArray>
 #include <QFuture>
 
 namespace LibSyncthing {
@@ -23,6 +24,7 @@ class SYNCTHINGWIDGETS_EXPORT SyncthingLauncher : public QObject {
     Q_PROPERTY(bool running READ isRunning NOTIFY runningChanged)
     Q_PROPERTY(CppUtilities::DateTime activeSince READ activeSince)
     Q_PROPERTY(bool manuallyStopped READ isManuallyStopped)
+    Q_PROPERTY(bool emittingOutput READ isEmittingOutput WRITE setEmittingOutput)
 
 public:
     explicit SyncthingLauncher(QObject *parent = nullptr);
@@ -31,6 +33,8 @@ public:
     CppUtilities::DateTime activeSince() const;
     bool isActiveFor(unsigned int atLeastSeconds) const;
     bool isManuallyStopped() const;
+    bool isEmittingOutput() const;
+    void setEmittingOutput(bool emittingOutput);
     static bool isLibSyncthingAvailable();
     static SyncthingLauncher *mainInstance();
     static void setMainInstance(SyncthingLauncher *mainInstance);
@@ -60,10 +64,14 @@ private Q_SLOTS:
     void stopLibSyncthing();
 
 private:
+    void handleOutputAvailable(QByteArray &&data);
+
     SyncthingProcess m_process;
     QFuture<void> m_future;
+    QByteArray m_outputBuffer;
     CppUtilities::DateTime m_futureStarted;
     bool m_manuallyStopped;
+    bool m_emittingOutput;
     bool m_useLibSyncthing;
     static SyncthingLauncher *s_mainInstance;
 };
@@ -100,6 +108,12 @@ inline bool SyncthingLauncher::isManuallyStopped() const
     return m_manuallyStopped;
 }
 
+/// \brief Returns whether the output/log should be emitted via outputAvailable() signal.
+inline bool SyncthingLauncher::isEmittingOutput() const
+{
+    return m_emittingOutput;
+}
+
 /// \brief Returns the SyncthingLauncher instance previously assigned via SyncthingLauncher::setMainInstance().
 inline SyncthingLauncher *SyncthingLauncher::mainInstance()
 {

widgets/settings/settingsdialog.cpp

@@ -891,6 +891,7 @@ QWidget *LauncherOptionPage::setupWidget()
         connect(m_launcher, &SyncthingLauncher::outputAvailable, this, &LauncherOptionPage::handleSyncthingOutputAvailable, Qt::QueuedConnection);
         connect(m_launcher, &SyncthingLauncher::exited, this, &LauncherOptionPage::handleSyncthingExited, Qt::QueuedConnection);
         connect(m_launcher, &SyncthingLauncher::errorOccurred, this, &LauncherOptionPage::handleSyncthingError, Qt::QueuedConnection);
+        m_launcher->setEmittingOutput(true);
     }
     connect(ui()->launchNowPushButton, &QPushButton::clicked, this, &LauncherOptionPage::launch);
     connect(ui()->stopPushButton, &QPushButton::clicked, this, &LauncherOptionPage::stop);