Add the possiblility to enable debug logging categories

Add a checkbox in the log window as well as a --logdebug command-line
option that should have the same effect.

Issue #5647

src/gui/application.cpp

@@ -73,6 +73,7 @@ static const char optionsC[] =
         "  --logexpire <hours>  : removes logs older than <hours> hours.\n"
         "                         (to be used with --logdir)\n"
         "  --logflush           : flush the log file after every write.\n"
+        "  --logdebug           : also output debug-level messages in the log (equivalent to setting the env var QT_LOGGING_RULES=\"qt.*=true;*.debug=true\").\n"
         "  --confdir <dirname>  : Use the given configuration folder.\n"
         ;
 
@@ -105,6 +106,7 @@ Application::Application(int &argc, char **argv) :
     _showLogWindow(false),
     _logExpire(0),
     _logFlush(false),
+    _logDebug(false),
     _userTriggeredConnect(false),
     _debugMode(false)
 {
@@ -358,6 +360,7 @@ void Application::setupLogging()
     Logger::instance()->setLogDir(_logDir);
     Logger::instance()->setLogExpire(_logExpire);
     Logger::instance()->setLogFlush(_logFlush);
+    Logger::instance()->setLogDebug(_logDebug);
 
     Logger::instance()->enterNextLogFile();
 
@@ -426,6 +429,8 @@ void Application::parseOptions(const QStringList &options)
             }
         } else if (option == QLatin1String("--logflush")) {
             _logFlush = true;
+        } else if (option == QLatin1String("--logdebug")) {
+            _logDebug = true;
         } else if (option == QLatin1String("--confdir")) {
             if (it.hasNext() && !it.peekNext().startsWith(QLatin1String("--"))) {
                 QString confDir = it.next();

src/gui/application.h

@@ -111,6 +111,7 @@ private:
     QString _logDir;
     int     _logExpire;
     bool    _logFlush;
+    bool    _logDebug;
     bool    _userTriggeredConnect;
     bool    _debugMode;
 

src/gui/logbrowser.cpp

@@ -85,6 +85,11 @@ LogBrowser::LogBrowser(QWidget *parent) :
     toolLayout->addWidget( _statusLabel );
     toolLayout->addStretch(5);
 
+    // Debug logging
+    _logDebugCheckBox = new QCheckBox(tr("&Capture debug messages") + " ");
+    connect(_logDebugCheckBox, SIGNAL(stateChanged(int)), SLOT(slotDebugCheckStateChanged(int)));
+    toolLayout->addWidget( _logDebugCheckBox );
+
     QDialogButtonBox *btnbox = new QDialogButtonBox;
     QPushButton *closeBtn = btnbox->addButton( QDialogButtonBox::Close );
     connect(closeBtn,SIGNAL(clicked()),this,SLOT(close()));
@@ -129,6 +134,12 @@ LogBrowser::~LogBrowser()
 {
 }
 
+void LogBrowser::showEvent(QShowEvent *)
+{
+    // This could have been changed through the --logdebug argument passed through the single application.
+    _logDebugCheckBox->setCheckState(Logger::instance()->logDebug() ? Qt::Checked : Qt::Unchecked);
+}
+
 void LogBrowser::closeEvent(QCloseEvent *)
 {
     ConfigFile cfg;
@@ -153,6 +164,11 @@ void LogBrowser::slotFind()
     search( searchText );
 }
 
+void LogBrowser::slotDebugCheckStateChanged(int checkState)
+{
+    Logger::instance()->setLogDebug(checkState == Qt::Checked);
+}
+
 void LogBrowser::search( const QString& str )
 {
     QList<QTextEdit::ExtraSelection> extraSelections;

src/gui/logbrowser.h

@@ -15,6 +15,7 @@
 #ifndef LOGBROWSER_H
 #define LOGBROWSER_H
 
+#include <QCheckBox>
 #include <QPlainTextEdit>
 #include <QTextStream>
 #include <QFile>
@@ -56,11 +57,13 @@ public:
     void setLogFile(const QString& , bool );
 
 protected:
+    void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
     void closeEvent(QCloseEvent *) Q_DECL_OVERRIDE;
 
 protected slots:
     void slotNewLog( const QString &msg );
     void slotFind();
+    void slotDebugCheckStateChanged(int);
     void search( const QString& );
     void slotSave();
     void slotClearLog();
@@ -68,6 +71,7 @@ protected slots:
 private:
     LogWidget *_logWidget;
     QLineEdit *_findTermEdit;
+    QCheckBox *_logDebugCheckBox;
     QPushButton *_saveBtn;
     QPushButton *_clearBtn;
     QLabel      *_statusLabel;

src/libsync/logger.cpp

@@ -81,7 +81,7 @@ Logger *Logger::instance()
 }
 
 Logger::Logger( QObject* parent) : QObject(parent),
-  _showTime(true), _logWindowActivated(false), _doFileFlush(false), _logExpire(0)
+  _showTime(true), _logWindowActivated(false), _doFileFlush(false), _logExpire(0), _logDebug(false)
 {
 #if QT_VERSION >= QT_VERSION_CHECK(5, 4, 0)
     qSetMessagePattern("%{time MM-dd hh:mm:ss:zzz} [ %{type} %{category} ]%{if-debug}\t[ %{function} ]%{endif}:\t%{message}");
@@ -235,6 +235,12 @@ void Logger::setLogFlush( bool flush )
     _doFileFlush = flush;
 }
 
+void Logger::setLogDebug( bool debug )
+{
+    QLoggingCategory::setFilterRules(debug ? QStringLiteral("qt.*=true\n*.debug=true") : QString());
+    _logDebug = debug;
+}
+
 void Logger::enterNextLogFile()
 {
     if (!_logDirectory.isEmpty()) {

src/libsync/logger.h

@@ -66,6 +66,9 @@ public:
   void setLogDir( const QString& dir );
   void setLogFlush( bool flush );
 
+  bool logDebug() const { return _logDebug; }
+  void setLogDebug( bool debug );
+
 signals:
   void logWindowLog(const QString&);
 
@@ -85,6 +88,7 @@ private:
   QFile       _logFile;
   bool        _doFileFlush;
   int         _logExpire;
+  bool        _logDebug;
   QScopedPointer<QTextStream> _logstream;
   QMutex      _mutex;
   QString     _logDirectory;