New class FLogger for logging

.gitignore

@@ -38,6 +38,7 @@ examples/.deps/
 examples/.libs/
 examples/calculator
 examples/dialog
+examples/event-log
 examples/string-operations
 examples/background-color
 examples/opti-move

.travis.yml

@@ -75,12 +75,12 @@ matrix:
       - whoami
       - echo -n | openssl s_client -CApath /etc/ssl/certs/ -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-certificates.crt
     script:
-      - cat /home/travis/build/gansm/finalcut/cov-int/scm_log.txt
+      - cat /home/travis/build/gansm/finalcut/cov-int/scm_log.txt || echo
       - autoreconf -v --install --force
       - ./configure --prefix=/usr CPPFLAGS="-DDEBUG" CXXFLAGS="-g -O0 -DDEBUG -DUNIT_TEST" --with-unit-test
       - make V=1 -j10
       - make check
-      - cat test/*.log
+      - cat test/*.log || echo
 
   #
   # Coveralls + Codecov

ChangeLog

@@ -1,3 +1,8 @@
+2020-05-13  Markus Gans  <guru.mail@muenster.de>
+	* The new class FLogger for logging, which can be redirected 
+	  to different I/O channels
+	* Adding the event-log example to show the logging functionality 
+
 2020-05-02  Markus Gans  <guru.mail@muenster.de>
 	* Transfer of all termcap functions into the FTermcap class
 

examples/Makefile.am

@@ -11,6 +11,7 @@ noinst_PROGRAMS = \
 	hello \
 	dialog \
 	input-dialog \
+	event-log \
 	fullwidth-character \
 	7segment \
 	choice \
@@ -39,6 +40,7 @@ noinst_PROGRAMS = \
 hello_SOURCES = hello.cpp
 dialog_SOURCES = dialog.cpp
 input_dialog_SOURCES = input-dialog.cpp
+event_log_SOURCES = event-log.cpp
 fullwidth_character_SOURCES = fullwidth-character.cpp
 7segment_SOURCES = 7segment.cpp
 choice_SOURCES = choice.cpp

examples/background-color.cpp

@@ -211,7 +211,6 @@ void Background::cb_choice (const finalcut::FWidget*, const FDataPtr)
   updateTerminal();
 }
 
-
 //----------------------------------------------------------------------
 //                               main part
 //----------------------------------------------------------------------
@@ -226,6 +225,20 @@ int main (int argc, char* argv[])
   Background dialog(&app);
   finalcut::FWidget::setMainWidget(&dialog);
   dialog.show();
+//-------------------------------------------------
+  std::cout << "\r\n" << std::flush;
+  finalcut::FLog& log = *finalcut::FApplication::getLog();
+
+  //std::ofstream file_stream("test.log", std::ofstream::out | std::ofstream::app);
+  //log.setLineEnding (finalcut::FLog::LF);
+  //log.setOutputStream(file_stream);
+
+  log.info("test1");
+  log.warn("test2");
+  log << finalcut::FLog::Error << "streaming " << "test 1" << std::flush;
+  log.enableTimestamp();
+  log << finalcut::FLog::Debug << "streaming test 2";
+//-------------------------------------------------
   return app.exec();
 }
 

examples/event-log.cpp

@@ -0,0 +1,353 @@
+/***********************************************************************
+* event-log.cpp - Logs events in a dialog box                          *
+*                                                                      *
+* This file is part of the Final Cut widget toolkit                    *
+*                                                                      *
+* Copyright 2020 Markus Gans                                           *
+*                                                                      *
+* The Final Cut is free software; you can redistribute it and/or       *
+* modify it under the terms of the GNU Lesser General Public License   *
+* as published by the Free Software Foundation; either version 3 of    *
+* the License, or (at your option) any later version.                  *
+*                                                                      *
+* The Final Cut is distributed in the hope that it will be useful,     *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
+* GNU Lesser General Public License for more details.                  *
+*                                                                      *
+* You should have received a copy of the GNU Lesser General Public     *
+* License along with this program.  If not, see                        *
+* <http://www.gnu.org/licenses/>.                                      *
+***********************************************************************/
+
+#include <fstream>
+#include <sstream>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+#include <final/final.h>
+
+using finalcut::FPoint;
+using finalcut::FRect;
+using finalcut::FSize;
+
+class EventLog;  // class forward declaration
+
+//----------------------------------------------------------------------
+// class EventLog::EventLog
+//----------------------------------------------------------------------
+
+class EventDialog final : public finalcut::FDialog
+{
+  public:
+    // Using-declaration
+    using FDialog::setGeometry;
+
+    // Constructor
+    explicit EventDialog (finalcut::FWidget* = nullptr);
+
+    // Disable copy constructor
+    EventDialog (const EventDialog&) = delete;
+
+    // Destructor
+    ~EventDialog();
+
+    // Disable copy assignment operator (=)
+    EventDialog& operator = (const EventDialog&) = delete;
+
+  private:
+    // Methods
+    finalcut::FString getMouseButtonName (int);
+    void logMouseEvent (finalcut::FString, finalcut::FMouseEvent&);
+
+    // Event handlers
+    void onClose (finalcut::FCloseEvent*) override;
+    void onShow (finalcut::FShowEvent*) override;
+    void onTimer (finalcut::FTimerEvent*) override;
+    void onKeyPress (finalcut::FKeyEvent*) override;
+    void onMouseDown (finalcut::FMouseEvent*) override;
+    void onMouseMove (finalcut::FMouseEvent*) override;
+    void onMouseUp (finalcut::FMouseEvent*) override;
+    void onMouseDoubleClick (finalcut::FMouseEvent* ev) override;
+    void onWindowActive (finalcut::FEvent*) override;
+    void onWindowInactive (finalcut::FEvent*) override;
+    void onWindowRaised (finalcut::FEvent*) override;
+    void onWindowLowered (finalcut::FEvent*) override;
+
+  private:
+    // Data members
+    finalcut::FLog& log{*finalcut::FApplication::getLog()};
+    finalcut::FLabel label{this};
+};
+
+//----------------------------------------------------------------------
+EventDialog::EventDialog (finalcut::FWidget* parent)
+  : FDialog(parent)
+{
+  // Dialog settings
+  //   Avoids calling a virtual function from the constructor
+  //   (CERT, OOP50-CPP)
+  FDialog::setText ("Event dialog");
+  FDialog::setGeometry (FPoint{15, 2}, FSize{53, 12});
+  setShadow();
+  label.setText("\n\nUse the keyboard or mouse\n"
+                "in this dialog to create events");
+  label.setAlignment(finalcut::fc::alignCenter);
+  label.setGeometry (FPoint(1, 1), getClientSize(), false);
+  addTimer(60000);  // Starts the timer every minute
+}
+
+//----------------------------------------------------------------------
+EventDialog::~EventDialog()  // destructor
+{ }
+
+//----------------------------------------------------------------------
+finalcut::FString EventDialog::getMouseButtonName (int btn_state)
+{
+  switch ( btn_state )
+  {
+    case finalcut::fc::LeftButton:
+      return "left";
+
+    case finalcut::fc::RightButton:
+      return "right";
+
+    case finalcut::fc::MiddleButton:
+      return "middle";
+
+    default:
+      return "unknown";
+  }
+
+  return "unknown";
+}
+
+//----------------------------------------------------------------------
+void EventDialog::logMouseEvent ( finalcut::FString state
+                                , finalcut::FMouseEvent& ev )
+{
+  const int mouse_x = ev.getX();
+  const int mouse_y = ev.getY();
+
+  log << finalcut::FLog::Info
+      << getMouseButtonName(ev.getButton())
+      << " mouse button " << state << " at ("
+      << mouse_x << ", " << mouse_y << ")" << std::flush;
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onClose (finalcut::FCloseEvent* ev)
+{
+  log.info("The event dialog was closed");
+  ev->accept();
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onShow (finalcut::FShowEvent*)
+{
+  log.info("The event dialog is now displayed");
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onTimer (finalcut::FTimerEvent*)
+{
+  log.info("-- minute marker --");
+}
+
+
+//----------------------------------------------------------------------
+void EventDialog::onKeyPress (finalcut::FKeyEvent* ev)
+{
+  const FKey key_id = ev->key();
+  finalcut::FString key_name = getKeyName(key_id);
+
+  if ( key_name.isEmpty() )
+    key_name = wchar_t(key_id);
+
+  log << finalcut::FLog::Info
+      << "Key " << key_name << " (id " << key_id << ")" << std::flush;
+
+  finalcut::FDialog::onKeyPress(ev);
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onMouseDown (finalcut::FMouseEvent* ev)
+{
+  logMouseEvent("down", *ev);
+  finalcut::FDialog::onMouseDown(ev);
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onMouseMove (finalcut::FMouseEvent* ev)
+{
+  logMouseEvent("move", *ev);
+  finalcut::FDialog::onMouseMove(ev);
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onMouseUp (finalcut::FMouseEvent* ev)
+{
+  logMouseEvent("up", *ev);
+  finalcut::FDialog::onMouseUp(ev);
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onMouseDoubleClick (finalcut::FMouseEvent* ev)
+{
+  logMouseEvent("double click", *ev);
+  finalcut::FDialog::onMouseDoubleClick(ev);
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onWindowActive (finalcut::FEvent* ev)
+{
+  log.info("The Event dialog is now active");
+  finalcut::FDialog::onWindowActive(ev);
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onWindowInactive (finalcut::FEvent* ev)
+{
+  log.info("The Event dialog is now inactive");
+  finalcut::FDialog::onWindowInactive(ev);
+}
+
+
+//----------------------------------------------------------------------
+void EventDialog::onWindowRaised (finalcut::FEvent* ev)
+{
+  log.info("The dialog was raised");
+  finalcut::FDialog::onWindowRaised(ev);
+}
+
+//----------------------------------------------------------------------
+void EventDialog::onWindowLowered (finalcut::FEvent* ev)
+{
+  log.info("The dialog was lowered");
+  finalcut::FDialog::onWindowLowered(ev);
+}
+
+
+//----------------------------------------------------------------------
+// class EventLog
+//----------------------------------------------------------------------
+
+class EventLog final : public finalcut::FDialog, public std::ostringstream
+{
+  public:
+    // Using-declaration
+    using FDialog::setGeometry;
+
+    // Constructor
+    explicit EventLog (finalcut::FWidget* = nullptr);
+
+    // Disable copy constructor
+    EventLog (const EventLog&) = delete;
+
+    // Destructor
+    ~EventLog();
+
+    // Disable copy assignment operator (=)
+    EventLog& operator = (const EventLog&) = delete;
+
+    // Event handlers
+    void onTimer (finalcut::FTimerEvent*) override;
+    void onClose (finalcut::FCloseEvent*) override;
+
+  private:
+    // Method
+    void adjustSize() override;
+
+    // Data members
+    finalcut::FTextView scrollText{this};
+    EventDialog* event_dialog{new EventDialog(this)};
+};
+
+//----------------------------------------------------------------------
+EventLog::EventLog (finalcut::FWidget* parent)
+  : FDialog(parent)
+{
+  // Dialog settings
+  //   Avoids calling a virtual function from the constructor
+  //   (CERT, OOP50-CPP)
+  FDialog::setText ("Event log");
+  FDialog::setGeometry (FPoint{4, 16}, FSize{75, 8});
+  setMinimumSize (FSize{75, 5});
+  setResizeable();
+  setShadow();
+  scrollText.ignorePadding();
+  scrollText.setGeometry (FPoint{1, 2}, FSize{getWidth(), getHeight() - 1});
+  event_dialog->setFocus();
+  addTimer(250);  // Starts the timer every 250 milliseconds
+}
+
+//----------------------------------------------------------------------
+EventLog::~EventLog()  // destructor
+{ }
+
+//----------------------------------------------------------------------
+void EventLog::onTimer (finalcut::FTimerEvent*)
+{
+  if ( ! str().empty() )
+  {
+    scrollText.append(str());
+    str("");
+    scrollText.scrollToEnd();
+    redraw();
+    updateTerminal();
+  }
+}
+
+//----------------------------------------------------------------------
+void EventLog::onClose (finalcut::FCloseEvent* ev)
+{
+  finalcut::FApplication::closeConfirmationDialog (this, ev);
+}
+
+//----------------------------------------------------------------------
+void EventLog::adjustSize()
+{
+  finalcut::FDialog::adjustSize();
+  scrollText.setGeometry (FPoint{1, 2}, FSize(getWidth(), getHeight() - 1));
+}
+
+
+//----------------------------------------------------------------------
+//                               main part
+//----------------------------------------------------------------------
+
+int main (int argc, char* argv[])
+{
+  finalcut::FApplication app(argc, argv);
+  EventLog dialog(&app);
+
+  // Get the global logger object
+  finalcut::FLog& log = *finalcut::FApplication::getLog();
+
+  // Set the line endings (default = CRLF)
+  log.setLineEnding (finalcut::FLog::LF);
+
+  // Write a timestamp before each output line
+  log.enableTimestamp();
+
+  // Set the dialog object as output stream
+  log.setOutputStream(dialog);
+
+  // ----------------------------------------------
+  // Remove the comment characters in the following
+  // two lines to log the output to a file.
+  // ----------------------------------------------
+  //std::ofstream file_stream("test.log", std::ofstream::out | std::ofstream::app);
+  //log.setOutputStream(file_stream);
+
+  // Sets the dialog as main widget
+  finalcut::FWidget::setMainWidget(&dialog);
+
+  // Show the dialog
+  dialog.show();
+
+  // Run the application
+  return app.exec();
+}
+

examples/string-operations.cpp

@@ -226,15 +226,15 @@ void streamToInterger()
   }
   catch (const std::underflow_error& ex)
   {
-    std::cerr << "underflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Underflow");
   }
   catch (const std::overflow_error& ex)
   {
-    std::cerr << "overflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Overflow");
   }
   catch (const std::invalid_argument& ex)
   {
-    std::cerr << "Arithmetic error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Arithmetic error");
   }
 }
 
@@ -250,15 +250,15 @@ void streamToUnsignedInterger()
   }
   catch (const std::underflow_error& ex)
   {
-    std::cerr << "underflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Underflow");
   }
   catch (const std::overflow_error& ex)
   {
-    std::cerr << "overflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Overflow");
   }
   catch (const std::invalid_argument& ex)
   {
-    std::cerr << "Arithmetic error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Arithmetic error");
   }
 }
 
@@ -274,15 +274,15 @@ void streamToDouble()
   }
   catch (const std::underflow_error& ex)
   {
-    std::cerr << "underflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Underflow");
   }
   catch (const std::overflow_error& ex)
   {
-    std::cerr << "overflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Overflow");
   }
   catch (const std::invalid_argument& ex)
   {
-    std::cerr << "Arithmetic error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Arithmetic error");
   }
 }
 
@@ -298,15 +298,15 @@ void streamToFloat()
   }
   catch (const std::underflow_error& ex)
   {
-    std::cerr << "underflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Underflow");
   }
   catch (const std::overflow_error& ex)
   {
-    std::cerr << "overflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Overflow");
   }
   catch (const std::invalid_argument& ex)
   {
-    std::cerr << "Arithmetic error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Arithmetic error");
   }
 }
 
@@ -498,15 +498,15 @@ void convertToNumberExample()
   }
   catch (const std::underflow_error& ex)
   {
-    std::cerr << "underflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Underflow");
   }
   catch (const std::overflow_error& ex)
   {
-    std::cerr << "overflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Overflow");
   }
   catch (const std::invalid_argument& ex)
   {
-    std::cerr << "Arithmetic error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Arithmetic error");
   }
 
   // Test: convert a string to a signed long interger
@@ -517,15 +517,15 @@ void convertToNumberExample()
   }
   catch (const std::underflow_error& ex)
   {
-    std::cerr << "underflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Underflow");
   }
   catch (const std::overflow_error& ex)
   {
-    std::cerr << "overflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Overflow");
   }
   catch (const std::invalid_argument& ex)
   {
-    std::cerr << "Arithmetic error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Arithmetic error");
   }
 
   // Test: convert a string to a double value
@@ -542,15 +542,15 @@ void convertToNumberExample()
   }
   catch (const std::underflow_error& ex)
   {
-    std::cerr << "underflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Underflow");
   }
   catch (const std::overflow_error& ex)
   {
-    std::cerr << "overflow: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Overflow");
   }
   catch (const std::invalid_argument& ex)
   {
-    std::cerr << "Arithmetic error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Arithmetic error");
   }
 }
 
@@ -640,9 +640,9 @@ void insertExample()
     std::cout << "   insert: "
               << insert_str.insert("changed ", 7) << std::endl;
   }
-  catch (const std::out_of_range& ex)
+  catch (const std::out_of_range&)
   {
-    std::cerr << "Out of Range error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Out of Range");
   }
 }
 
@@ -655,14 +655,14 @@ void indexExample()
 
   try
   {
-    index[0] = L'I';  // write a wide character at position 0
+    index[0] = L'I';  // Write a wide character at position 0
     printf ( "    index: [0] = %c ; [4] = %c\n"
            , char(index[0])
            , char(index[4]) );
   }
   catch (const std::out_of_range& ex)
   {
-    std::cerr << "Out of Range error: " << ex.what() << std::endl;
+    finalcut::FApplication::getLog()->error("Out of Range");
   }
 }
 

examples/ui.cpp

@@ -981,7 +981,7 @@ void MyDialog::cb_view (const finalcut::FWidget*, FDataPtr data)
                                int(getRootWidget()->getHeight() / 6) }
                     , FSize{60, getRootWidget()->getHeight() * 3 / 4} );
   view->setResizeable();
-  std::string line = "";
+  std::string line{""};
   std::ifstream infile;
   infile.open(file);
 
@@ -1028,7 +1028,7 @@ int main (int argc, char* argv[])
   //app.setEncoding(finalcut::fc::VT100);
 
   // Sets the terminal size to 94×30
-  //app.setTermSize(94,30);
+  //finalcut::FTerm::setTermSize(FSize{94, 30});
 
   // Enable the final cut graphical font
   //app.setNewFont();

src/Makefile.am

@@ -25,6 +25,8 @@ libfinal_la_SOURCES = \
 	flabel.cpp \
 	flistbox.cpp \
 	flistview.cpp \
+	flog.cpp \
+	flogger.cpp \
 	fmenu.cpp \
 	fmouse.cpp \
 	fsystem.cpp \
@@ -98,6 +100,8 @@ finalcutinclude_HEADERS = \
 	include/final/flineedit.h \
 	include/final/flistbox.h \
 	include/final/flistview.h \
+	include/final/flog.h \
+	include/final/flogger.h \
 	include/final/fmenu.h \
 	include/final/fmouse.h \
 	include/final/fkeyboard.h \

src/Makefile.clang

@@ -25,6 +25,8 @@ INCLUDE_HEADERS = \
 	flineedit.h \
 	flistbox.h \
 	flistview.h \
+	flog.h \
+	flogger.h \
 	fmenu.h \
 	fdialoglistmenu.h \
 	fmenubar.h \
@@ -98,6 +100,8 @@ OBJS = \
 	flabel.o \
 	flistbox.o \
 	flistview.o \
+	flog.o \
+	flogger.o \
 	fmenu.o \
 	fdialoglistmenu.o \
 	fmenubar.o \

src/Makefile.gcc

@@ -25,6 +25,8 @@ INCLUDE_HEADERS = \
 	flineedit.h \
 	flistbox.h \
 	flistview.h \
+	flog.h \
+	flogger.h \
 	fmenu.h \
 	fdialoglistmenu.h \
 	fmenubar.h \
@@ -98,6 +100,8 @@ OBJS = \
 	flabel.o \
 	flistbox.o \
 	flistview.o \
+	flog.o \
+	flogger.o \
 	fmenu.o \
 	fdialoglistmenu.o \
 	fmenubar.o \

src/fapplication.cpp

@@ -25,6 +25,8 @@
 
 #include "final/fapplication.h"
 #include "final/fevent.h"
+#include "final/flog.h"
+#include "final/flogger.h"
 #include "final/fmenu.h"
 #include "final/fmenubar.h"
 #include "final/fmessagebox.h"
@@ -108,6 +110,20 @@ FApplication* FApplication::getApplicationObject()
   return app_object;
 }
 
+//----------------------------------------------------------------------
+std::shared_ptr<FLog>& FApplication::getLog()
+{
+  // Global logger object
+  static std::shared_ptr<FLog> logger = std::make_shared<FLogger>();
+  return logger;
+}
+
+//----------------------------------------------------------------------
+void FApplication::setLog (const std::shared_ptr<FLog>& logger)
+{
+  getLog() = logger;
+}
+
 //----------------------------------------------------------------------
 bool FApplication::isQuit()
 {
@@ -349,6 +365,9 @@ void FApplication::init (uInt64 key_time, uInt64 dblclick_time)
   // Set the default double click interval
   if ( mouse )
     mouse->setDblclickInterval (dblclick_time);
+
+  // Initialize logging
+  getLog()->setLineEnding(FLog::CRLF);
 }
 
 //----------------------------------------------------------------------
@@ -1094,6 +1113,17 @@ void FApplication::processCloseWidget()
   setTerminalUpdates (FVTerm::start_terminal_updates);
 }
 
+//----------------------------------------------------------------------
+void FApplication::processLogger()
+{
+  // Synchronizing the stream buffer with the logging output
+
+  auto logger = getLog();
+
+  if ( ! logger->str().empty() )
+    logger->pubsync();
+}
+
 //----------------------------------------------------------------------
 bool FApplication::processNextEvent()
 {
@@ -1104,6 +1134,7 @@ bool FApplication::processNextEvent()
   processResizeEvent();
   processTerminalUpdate();
   processCloseWidget();
+  processLogger();
 
   sendQueuedEvents();
   num_events += processTimerEvent();

src/fcombobox.cpp

@@ -27,6 +27,7 @@
 #include "final/flabel.h"
 #include "final/flineedit.h"
 #include "final/flistbox.h"
+#include "final/flog.h"
 #include "final/fmouse.h"
 #include "final/fpoint.h"
 #include "final/fsize.h"
@@ -605,9 +606,9 @@ void FComboBox::passEventToListWindow (FMouseEvent* const& ev)
     list_window.list.setFocus();
     list_window.list.onMouseMove(_ev.get());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMouseEvent");
   }
 }
 
@@ -631,6 +632,7 @@ void FComboBox::cb_setInputField (const FWidget*, const FDataPtr)
   input_field = list.getItem(index).getText();
   input_field.redraw();
   processChanged();
+  std::cout << "\r\n";
 }
 
 //----------------------------------------------------------------------
@@ -692,9 +694,9 @@ void FComboBox::cb_inputFieldHandOver (const FWidget*, const FDataPtr)
     list_window.list.setFocus();
     list_window.list.onMouseMove(_ev.get());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMouseEvent");
   }
 }
 

src/fdialog.cpp

@@ -824,9 +824,9 @@ void FDialog::initDialogMenu()
   {
     dialog_menu = new FMenu ("-", this);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMenu");
     return;
   }
 
@@ -854,9 +854,9 @@ void FDialog::initMoveSizeMenuItem (FMenu* menu)
   {
     move_size_item = new FMenuItem (menu);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMenuItem");
     return;
   }
 
@@ -877,9 +877,9 @@ void FDialog::initZoomMenuItem (FMenu* menu)
   {
     zoom_item = new FMenuItem (menu);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMenuItem");
     return;
   }
 
@@ -900,9 +900,9 @@ void FDialog::initCloseMenuItem (FMenu* menu)
   {
     close_item = new FMenuItem ("&Close", menu);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMenuItem");
     return;
   }
 
@@ -1358,9 +1358,9 @@ inline void FDialog::passEventToSubMenu ( const mouseStates& ms
     setClickedWidget(dialog_menu);
     dialog_menu->onMouseMove(_ev.get());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMouseEvent");
     return;
   }
 }
@@ -1646,9 +1646,9 @@ void FDialog::cb_move (const FWidget*, const FDataPtr)
   {
     tooltip = new FToolTip(this);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FToolTip");
     return;
   }
 

src/flabel.cpp

@@ -27,6 +27,7 @@
 #include "final/fcolorpair.h"
 #include "final/fevent.h"
 #include "final/flabel.h"
+#include "final/flog.h"
 #include "final/fstatusbar.h"
 
 namespace finalcut
@@ -173,9 +174,9 @@ void FLabel::onMouseDown (FMouseEvent* ev)
             std::make_shared<FMouseEvent>(fc::MouseDown_Event, p, tp, b);
         FApplication::sendEvent (parent, _ev.get());
       }
-      catch (const std::bad_alloc& ex)
+      catch (const std::bad_alloc&)
       {
-        std::cerr << bad_alloc_str << ex.what() << std::endl;
+        badAllocOutput ("FMouseEvent");
         return;
       }
     }

src/flineedit.cpp

@@ -25,6 +25,7 @@
 #include "final/fapplication.h"
 #include "final/fevent.h"
 #include "final/flabel.h"
+#include "final/flog.h"
 #include "final/flineedit.h"
 #include "final/fpoint.h"
 #include "final/fsize.h"
@@ -860,7 +861,8 @@ inline FLineEdit::offsetPair FLineEdit::endPosToOffset (std::size_t pos)
     }
     catch (const std::out_of_range& ex)
     {
-      std::cerr << "Out of Range error: " << ex.what() << std::endl;
+      *FApplication::getLog() << FLog::Error
+          << "Out of Range error: " << ex.what() << std::endl;
     }
 
     if ( input_width >= char_width )
@@ -883,7 +885,8 @@ inline FLineEdit::offsetPair FLineEdit::endPosToOffset (std::size_t pos)
         }
         catch (const std::out_of_range& ex)
         {
-          std::cerr << "Out of Range error: " << ex.what() << std::endl;
+          *FApplication::getLog() << FLog::Error
+              << "Out of Range error: " << ex.what() << std::endl;
         }
       }
 
@@ -918,7 +921,8 @@ std::size_t FLineEdit::clickPosToCursorPos (std::size_t pos)
     }
     catch (const std::out_of_range& ex)
     {
-      std::cerr << "Out of Range error: " << ex.what() << std::endl;
+      *FApplication::getLog() << FLog::Error
+          << "Out of Range error: " << ex.what() << std::endl;
     }
 
     idx++;
@@ -951,7 +955,8 @@ void FLineEdit::adjustTextOffset()
     }
     catch (const std::out_of_range& ex)
     {
-      std::cerr << "Out of Range error: " << ex.what() << std::endl;
+      *FApplication::getLog() << FLog::Error
+          << "Out of Range error: " << ex.what() << std::endl;
     }
   }
 
@@ -963,7 +968,8 @@ void FLineEdit::adjustTextOffset()
     }
     catch (const std::out_of_range& ex)
     {
-      std::cerr << "Out of Range error: " << ex.what() << std::endl;
+      *FApplication::getLog() << FLog::Error
+          << "Out of Range error: " << ex.what() << std::endl;
     }
   }
 

src/flistview.cpp

@@ -910,9 +910,9 @@ FObject::iterator FListView::insert ( const FStringList& cols
   {
     item = new FListViewItem (cols, d, getNullIterator());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FListViewItem");
     return getNullIterator();
   }
 

src/flog.cpp

@@ -0,0 +1,87 @@
+/***********************************************************************
+* flog.cpp - Interface of the FINAL CUT logger                         *
+*                                                                      *
+* This file is part of the Final Cut widget toolkit                    *
+*                                                                      *
+* Copyright 2020 Markus Gans                                           *
+*                                                                      *
+* The Final Cut is free software; you can redistribute it and/or       *
+* modify it under the terms of the GNU Lesser General Public License   *
+* as published by the Free Software Foundation; either version 3 of    *
+* the License, or (at your option) any later version.                  *
+*                                                                      *
+* The Final Cut is distributed in the hope that it will be useful,     *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
+* GNU Lesser General Public License for more details.                  *
+*                                                                      *
+* You should have received a copy of the GNU Lesser General Public     *
+* License along with this program.  If not, see                        *
+* <http://www.gnu.org/licenses/>.                                      *
+***********************************************************************/
+
+#include "final/flog.h"
+
+namespace finalcut
+{
+
+//----------------------------------------------------------------------
+// class FLog
+//----------------------------------------------------------------------
+
+// constructors and destructor
+//----------------------------------------------------------------------
+FLog::FLog()
+{ }
+
+//----------------------------------------------------------------------
+FLog::~FLog()  // destructor
+{
+  sync();
+}
+
+
+// public methods of FLog
+//----------------------------------------------------------------------
+FLog& FLog::operator << (LogLevel l)
+{
+  sync();
+
+  switch ( l )
+  {
+    case Info:
+      current_log = std::bind(&FLog::info, this, _1);
+      break;
+
+    case Warn:
+      current_log = std::bind(&FLog::warn, this, _1);
+      break;
+
+    case Error:
+      current_log = std::bind(&FLog::error, this, _1);
+      break;
+
+    case Debug:
+      current_log = std::bind(&FLog::debug, this, _1);
+      break;
+  }
+
+  return *this;
+}
+
+
+// protected methods of FLog
+//----------------------------------------------------------------------
+int FLog::sync()
+{
+  if ( ! str().empty() )
+  {
+    current_log (str());
+    str("");
+  }
+
+  return 0;
+}
+
+}  // namespace finalcut
+

src/flogger.cpp

@@ -0,0 +1,124 @@
+/***********************************************************************
+* flogger.cpp - The FINAL CUT text logger                              *
+*                                                                      *
+* This file is part of the Final Cut widget toolkit                    *
+*                                                                      *
+* Copyright 2020 Markus Gans                                           *
+*                                                                      *
+* The Final Cut is free software; you can redistribute it and/or       *
+* modify it under the terms of the GNU Lesser General Public License   *
+* as published by the Free Software Foundation; either version 3 of    *
+* the License, or (at your option) any later version.                  *
+*                                                                      *
+* The Final Cut is distributed in the hope that it will be useful,     *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
+* GNU Lesser General Public License for more details.                  *
+*                                                                      *
+* You should have received a copy of the GNU Lesser General Public     *
+* License along with this program.  If not, see                        *
+* <http://www.gnu.org/licenses/>.                                      *
+***********************************************************************/
+
+#include "final/flogger.h"
+
+namespace finalcut
+{
+
+//----------------------------------------------------------------------
+// class FLogger
+//----------------------------------------------------------------------
+
+// constructors and destructor
+//----------------------------------------------------------------------
+FLogger::FLogger()
+{ }
+
+//----------------------------------------------------------------------
+FLogger::~FLogger()  // destructor
+{ }
+
+
+// private methods of FLogger
+//----------------------------------------------------------------------
+void FLogger::newlineReplace ( std::string& str
+                             , const std::string& replace_str )
+{
+  std::size_t pos{0};
+  std::size_t npos{std::string::npos};
+
+  while ( (pos = str.find("\n", pos)) != npos
+       && pos + 1 < str.length() )
+  {
+    str.replace(pos, 1, replace_str);
+    pos += replace_str.length();
+  }
+}
+
+//----------------------------------------------------------------------
+const std::string FLogger::getTimeString()
+{
+  char str[100];
+  const auto& now = std::chrono::system_clock::now();
+  const auto& t = std::chrono::system_clock::to_time_t(now);
+  std::stringstream str_stream;
+  // Print RFC 2822 date
+  const auto& tm = std::localtime(&t);
+  std::strftime(str, sizeof(str), "%a, %d %b %Y %T %z", tm);
+  return std::string(str);
+}
+
+//----------------------------------------------------------------------
+const std::string FLogger::getEOL()
+{
+  if ( end_of_line == FLog::LF )
+    return "\n";
+  else if ( end_of_line == FLog::CR )
+    return "\r";
+  else if ( end_of_line == FLog::CRLF )
+    return "\r\n";
+
+  return "";
+}
+
+//----------------------------------------------------------------------
+void FLogger::printLogLine (const std::string& msg)
+{
+  const std::string& log_level = [this] ()
+  {
+    switch ( level )
+    {
+      case Info:
+        return "INFO";
+
+      case Warn:
+        return "WARNING";
+
+      case Error:
+        return "ERROR";
+
+      case Debug:
+        return "DEBUG";
+    }
+
+    return "";
+  }();
+
+  const std::string prefix = [this, &log_level] ()
+  {
+    if ( timestamp )
+      return getTimeString() + " [" + log_level + "] ";
+    else
+      return "[" + log_level + "] ";
+  }();
+
+  std::string message{msg};
+  const std::string& eol = getEOL();
+  const std::string replace_str = eol + prefix;
+  newlineReplace (message, replace_str);
+  output << prefix << message << eol;
+}
+
+}  // namespace finalcut
+
+

src/fmenu.cpp

@@ -28,6 +28,7 @@
 #include "final/fcolorpair.h"
 #include "final/fdialog.h"
 #include "final/fevent.h"
+#include "final/flog.h"
 #include "final/fmenu.h"
 #include "final/fmenubar.h"
 #include "final/fmenuitem.h"
@@ -941,9 +942,9 @@ void FMenu::passEventToSubMenu (FMouseEvent* const& ev)
     setClickedWidget(opened_sub_menu);
     opened_sub_menu->onMouseMove(_ev.get());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMouseEvent");
   }
 }
 
@@ -965,9 +966,9 @@ void FMenu::passEventToSuperMenu (FMouseEvent* const& ev)
     setClickedWidget(smenu);
     smenu->onMouseMove(_ev.get());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMouseEvent");
   }
 }
 
@@ -990,9 +991,9 @@ void FMenu::passEventToMenuBar (FMouseEvent* const& ev)
     mbar.mouse_down = true;
     mbar.onMouseMove(_ev.get());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMouseEvent");
   }
 }
 

src/fmenubar.cpp

@@ -25,6 +25,7 @@
 
 #include "final/fapplication.h"
 #include "final/fevent.h"
+#include "final/flog.h"
 #include "final/fmenu.h"
 #include "final/fmenubar.h"
 #include "final/fmenuitem.h"
@@ -944,9 +945,9 @@ void FMenuBar::passEventToMenu (const FMouseEvent* const& ev)
       setClickedWidget(menu);
       menu->onMouseMove(_ev.get());
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FMouseEvent");
     }
   }
 }

src/fmenuitem.cpp

@@ -25,6 +25,7 @@
 #include "final/fapplication.h"
 #include "final/fdialog.h"
 #include "final/fevent.h"
+#include "final/flog.h"
 #include "final/fmenu.h"
 #include "final/fmenubar.h"
 #include "final/fmenulist.h"
@@ -614,9 +615,9 @@ void FMenuItem::createDialogList (FMenu* winmenu)
           // create a new dialog list item
           win_item = new FMenuItem (name, winmenu);
         }
-        catch (const std::bad_alloc& ex)
+        catch (const std::bad_alloc&)
         {
-          std::cerr << bad_alloc_str << ex.what() << std::endl;
+          badAllocOutput ("FMenuItem");
           return;
         }
 
@@ -663,9 +664,9 @@ void FMenuItem::passMouseEvent ( T widget, const FMouseEvent* ev
   {
     _ev = std::make_shared<FMouseEvent>(ev_type, p2, t, b);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FMouseEvent");
     return;
   }
 

src/fmessagebox.cpp

@@ -24,6 +24,7 @@
 
 #include "final/fapplication.h"
 #include "final/fbutton.h"
+#include "final/flog.h"
 #include "final/fmessagebox.h"
 
 namespace finalcut
@@ -256,9 +257,9 @@ inline void FMessageBox::allocation (int button0, int button1, int button2)
       button[2]->setHeight(1, false);
     }
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FButton");
     return;
   }
 }

src/fobject.cpp

@@ -60,9 +60,9 @@ FObject::FObject (FObject* parent)
       {
         timer_list = new FTimerList;
       }
-      catch (const std::bad_alloc& ex)
+      catch (const std::bad_alloc&)
       {
-        std::cerr << bad_alloc_str << ex.what() << std::endl;
+        badAllocOutput ("FTimerList");
         return;
       }
     }

src/fstartoptions.cpp

@@ -20,6 +20,8 @@
 * <http://www.gnu.org/licenses/>.                                      *
 ***********************************************************************/
 
+#include "final/fapplication.h"
+#include "final/flog.h"
 #include "final/fstartoptions.h"
 
 namespace finalcut
@@ -65,9 +67,9 @@ FStartOptions& FStartOptions::getFStartOptions()
     {
       start_options = new FStartOptions;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FStartOptions");
       std::abort();
     }
   }

src/fstring.cpp

@@ -25,6 +25,8 @@
 #include <utility>
 #include <vector>
 
+#include "final/fapplication.h"
+#include "final/flog.h"
 #include "final/fstring.h"
 
 namespace finalcut
@@ -1232,9 +1234,9 @@ inline void FString::initLength (std::size_t len)
     string = new wchar_t[bufsize]();
     std::wmemset (string, L'\0', bufsize);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("wchar_t[bufsize]");
   }
 }
 
@@ -1263,9 +1265,9 @@ void FString::_assign (const wchar_t s[])
     {
       string = new wchar_t[bufsize]();
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("wchar_t[bufsize]");
       return;
     }
   }
@@ -1291,9 +1293,9 @@ void FString::_insert (std::size_t len, const wchar_t s[])
   {
     string = new wchar_t[bufsize]();
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << " " << ex.what() << std::endl;
+    badAllocOutput ("wchar_t[bufsize]");
     return;
   }
 
@@ -1338,9 +1340,9 @@ void FString::_insert ( std::size_t pos
       {
         sptr = new wchar_t[bufsize]();  // generate new string
       }
-      catch (const std::bad_alloc& ex)
+      catch (const std::bad_alloc&)
       {
-        std::cerr << bad_alloc_str << " " << ex.what() << std::endl;
+        badAllocOutput ("wchar_t[bufsize]");
         return;
       }
 
@@ -1382,9 +1384,9 @@ void FString::_remove (std::size_t pos, std::size_t len)
     {
       sptr = new wchar_t[bufsize]();    // generate new string
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << " " << ex.what() << std::endl;
+      badAllocOutput ("wchar_t[bufsize]");
       return;
     }
 
@@ -1416,9 +1418,9 @@ inline char* FString::wc_to_c_str (const wchar_t s[]) const
       // Generate a empty string ("")
       c_string = new char[1]();
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << " " << ex.what() << std::endl;
+      badAllocOutput ("char[1]");
       return nullptr;
     }
 
@@ -1441,9 +1443,9 @@ inline char* FString::wc_to_c_str (const wchar_t s[]) const
     // pre-initialiaze the whole string with '\0'
     std::memset (c_string, '\0', std::size_t(dest_size));
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << " " << ex.what() << std::endl;
+    badAllocOutput ("char[std::size_t(dest_size)]");
     return nullptr;
   }
 
@@ -1473,9 +1475,9 @@ inline wchar_t* FString::c_to_wc_str (const char s[]) const
       // Generate a empty wide string (L"")
       return new wchar_t[1]();
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << " " << ex.what() << std::endl;
+      badAllocOutput ("wchar_t[1]");
       return nullptr;
     }
   }
@@ -1493,9 +1495,9 @@ inline wchar_t* FString::c_to_wc_str (const char s[]) const
     // pre-initialiaze the whole string with '\0'
     std::wmemset (dest, L'\0', std::size_t(size));
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << " " << ex.what() << std::endl;
+    badAllocOutput ("wchar_t[std::size_t(size)]");
     return nullptr;
   }
 

src/fsystemimpl.cpp

@@ -3,7 +3,7 @@
 *                                                                      *
 * This file is part of the Final Cut widget toolkit                    *
 *                                                                      *
-* Copyright 2019 Markus Gans                                           *
+* Copyright 2019-2020 Markus Gans                                      *
 *                                                                      *
 * The Final Cut is free software; you can redistribute it and/or       *
 * modify it under the terms of the GNU Lesser General Public License   *
@@ -42,6 +42,7 @@ FSystemImpl::FSystemImpl()
 FSystemImpl::~FSystemImpl()  // destructor
 { }
 
+// public methods of FSystemImpl
 //----------------------------------------------------------------------
 int FSystemImpl::getpwuid_r ( uid_t uid, struct passwd* pwd
                             , char* buf, size_t buflen

src/fterm.cpp

@@ -31,6 +31,7 @@
 #include "final/fcolorpalette.h"
 #include "final/fkey_map.h"
 #include "final/fkeyboard.h"
+#include "final/flog.h"
 #include "final/fmouse.h"
 #include "final/foptiattr.h"
 #include "final/foptimove.h"
@@ -189,9 +190,9 @@ FTermData* FTerm::getFTermData()
     {
       data = new FTermData;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermData");
       std::abort();
     }
   }
@@ -208,9 +209,9 @@ FSystem* FTerm::getFSystem()
     {
       fsys = new FSystemImpl;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermData");
       std::abort();
     }
   }
@@ -227,9 +228,9 @@ FOptiMove* FTerm::getFOptiMove()
     {
       opti_move = new FOptiMove;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FOptiMove");
       std::abort();
     }
   }
@@ -246,9 +247,9 @@ FOptiAttr* FTerm::getFOptiAttr()
     {
       opti_attr = new FOptiAttr;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FOptiAttr");
       std::abort();
     }
   }
@@ -265,9 +266,9 @@ FTermDetection* FTerm::getFTermDetection()
     {
       term_detection = new FTermDetection;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermDetection");
       std::abort();
     }
   }
@@ -284,9 +285,9 @@ FTermXTerminal* FTerm::getFTermXTerminal()
     {
       xterm = new FTermXTerminal;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermXTerminal");
       std::abort();
     }
   }
@@ -303,9 +304,9 @@ FKeyboard* FTerm::getFKeyboard()
     {
       keyboard = new FKeyboard;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FKeyboard");
       std::abort();
     }
   }
@@ -322,9 +323,9 @@ FMouseControl* FTerm::getFMouseControl()
     {
       mouse = new FMouseControl;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FMouseControl");
       std::abort();
     }
   }
@@ -342,9 +343,9 @@ FTermLinux* FTerm::getFTermLinux()
     {
       linux = new FTermLinux;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermLinux");
       std::abort();
     }
   }
@@ -362,9 +363,9 @@ FTermFreeBSD* FTerm::getFTermFreeBSD()
     {
       freebsd = new FTermFreeBSD;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermFreeBSD");
       std::abort();
     }
   }
@@ -382,9 +383,9 @@ FTermOpenBSD* FTerm::getFTermOpenBSD()
     {
       openbsd = new FTermOpenBSD;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermOpenBSD");
       std::abort();
     }
   }
@@ -403,9 +404,9 @@ FTermDebugData& FTerm::getFTermDebugData()
     {
       debug_data = new FTermDebugData;
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FTermDebugData");
       std::abort();
     }
   }
@@ -624,7 +625,7 @@ void FTerm::redefineDefaultColors (bool enable)
   if ( isNewFont() )  // NewFont need the reverse-video attribute
     return;
 
-  xterm->redefineDefaultColors (enable);
+  getFTermXTerminal()->redefineDefaultColors (enable);
 }
 
 //----------------------------------------------------------------------
@@ -665,7 +666,7 @@ bool FTerm::setVGAFont()
   {
     data->setVGAFont(true);
     // Set font in xterm to vga
-    xterm->setFont("vga");
+    getFTermXTerminal()->setFont("vga");
     data->setNewFont(false);
   }
 #if defined(__linux__)
@@ -700,7 +701,7 @@ bool FTerm::setNewFont()
   {
     data->setNewFont(true);
     // Set font in xterm to 8x16graph
-    xterm->setFont("8x16graph");
+    getFTermXTerminal()->setFont("8x16graph");
   }
 #if defined(__linux__)
   else if ( isLinuxTerm() )
@@ -739,12 +740,12 @@ bool FTerm::setOldFont()
     if ( font.getLength() > 2 )
     {
       // restore saved xterm font
-      xterm->setFont(font);
+      getFTermXTerminal()->setFont(font);
     }
     else
     {
       // Set font in xterm to vga
-      xterm->setFont("vga");
+      getFTermXTerminal()->setFont("vga");
     }
 
     retval = true;
@@ -914,7 +915,7 @@ void FTerm::setTermSize (const FSize& size)
 {
   // Set xterm size
 
-  xterm->setTermSize (size);
+  getFTermXTerminal()->setTermSize (size);
 }
 
 //----------------------------------------------------------------------
@@ -922,7 +923,7 @@ void FTerm::setTermTitle (const FString& title)
 {
   // Set the xterm window title
 
-  xterm->setTitle (title);
+  getFTermXTerminal()->setTitle (title);
 }
 
 //----------------------------------------------------------------------
@@ -1268,10 +1269,10 @@ void FTerm::initScreenSettings()
 #endif
 
   // set xterm underline cursor
-  xterm->setCursorStyle (fc::blinking_underline);
+  getFTermXTerminal()->setCursorStyle (fc::blinking_underline);
 
   // set xterm color settings to defaults
-  xterm->setDefaults();
+  getFTermXTerminal()->setDefaults();
 }
 
 //----------------------------------------------------------------------
@@ -1297,7 +1298,7 @@ void FTerm::exitWithMessage (const FString& message)
   std::fflush (stdout);
 
   if ( ! message.isEmpty() )
-    std::cerr << "Warning: " << message << std::endl;
+    FApplication::getLog()->warn(message.c_str());
 
   std::exit (EXIT_FAILURE);
 }
@@ -1322,7 +1323,7 @@ void FTerm::init_global_values (bool disable_alt_screen)
   data->useAlternateScreen(! disable_alt_screen);
 
   // Initialize xterm object
-  xterm->init();
+  getFTermXTerminal()->init();
 
   if ( ! getStartOptions().terminal_detection )
     term_detection->setTerminalDetection (false);
@@ -1845,9 +1846,9 @@ void FTerm::init_captureFontAndTitle()
   if ( ! FStartOptions::getFStartOptions().terminal_data_request )
     return;
 
-  xterm->captureFontAndTitle();
+  getFTermXTerminal()->captureFontAndTitle();
-  const auto& font = xterm->getFont();
+  const auto& font = getFTermXTerminal()->getFont();
-  const auto& title = xterm->getTitle();
+  const auto& title = getFTermXTerminal()->getTitle();
 
   if ( ! font.isEmpty() )
     data->setXtermFont(font);
@@ -1899,14 +1900,14 @@ void FTerm::restoreColorPalette()
   else  // 8 colors
     FColorPalette::reset8ColorPalette (FTerm::setPalette);
 
-  xterm->resetColorMap();
+  getFTermXTerminal()->resetColorMap();
   resetColorMap();
 }
 
 //----------------------------------------------------------------------
 void FTerm::setInsertCursorStyle()
 {
-  xterm->setCursorStyle (fc::blinking_underline);
+  getFTermXTerminal()->setCursorStyle (fc::blinking_underline);
   setKDECursor(fc::UnderlineCursor);
 
 #if defined(__linux__)
@@ -1916,13 +1917,13 @@ void FTerm::setInsertCursorStyle()
 #endif
 
   if ( isUrxvtTerminal() )
-    xterm->setCursorColor ("rgb:ffff/ffff/ffff");
+    getFTermXTerminal()->setCursorColor ("rgb:ffff/ffff/ffff");
 }
 
 //----------------------------------------------------------------------
 void FTerm::setOverwriteCursorStyle()
 {
-  xterm->setCursorStyle (fc::steady_block);
+  getFTermXTerminal()->setCursorStyle (fc::steady_block);
   setKDECursor(fc::BlockCursor);
 
 #if defined(__linux__)
@@ -1932,7 +1933,7 @@ void FTerm::setOverwriteCursorStyle()
 #endif
 
   if ( isUrxvtTerminal() )
-    xterm->setCursorColor ("rgb:eeee/0000/0000");
+    getFTermXTerminal()->setCursorColor ("rgb:eeee/0000/0000");
 }
 
 //----------------------------------------------------------------------
@@ -2250,7 +2251,7 @@ void FTerm::init (bool disable_alt_screen)
 
   // Activate meta key sends escape
   if ( isXTerminal() )
-    xterm->metaSendsESC(true);
+    getFTermXTerminal()->metaSendsESC(true);
 
   // switch to application escape key mode
   enableApplicationEscKey();
@@ -2429,10 +2430,10 @@ void FTerm::finish()
   }
 
   // Reset xterm color settings to default values
-  xterm->resetDefaults();
+  getFTermXTerminal()->resetDefaults();
 
   // Set xterm full block cursor
-  xterm->setCursorStyle (fc::steady_block);
+  getFTermXTerminal()->setCursorStyle (fc::steady_block);
 
   // Restore the color palette
   if ( getStartOptions().color_change )
@@ -2454,7 +2455,7 @@ void FTerm::finish()
 
   // Deactivate meta key sends escape
   if ( isXTerminal() )
-    xterm->metaSendsESC(false);
+    getFTermXTerminal()->metaSendsESC(false);
 
   // Switch to the normal screen
   useNormalScreenBuffer();
@@ -2471,7 +2472,7 @@ void FTerm::finish()
   const auto& exit_message = data->getExitMessage();
 
   if ( ! exit_message.isEmpty() )
-    std::cerr << exit_message << std::endl;
+    FApplication::getLog()->info(exit_message.c_str());
 
   deallocationValues();
 }
@@ -2546,9 +2547,11 @@ void FTerm::signal_handler (int signum)
       init_term_object->finish();
       std::fflush (stderr);
       std::fflush (stdout);
-      std::cerr << "\nProgram stopped: signal "
+      *FApplication::getLog() << FLog::Error
-                << signum
+                              << "\nProgram stopped: signal "
-                << " (" << strsignal(signum) << ")" << std::endl;
+                              << signum
+                              << " (" << strsignal(signum) << ")"
+                              << std::endl;
       std::terminate();
 
     default:

src/fterm_functions.cpp

@@ -27,7 +27,9 @@
 #include <algorithm>
 #include <numeric>
 
+#include "final/fapplication.h"
 #include "final/fcharmap.h"
+#include "final/flog.h"
 #include "final/fterm.h"
 #include "final/ftermbuffer.h"
 
@@ -451,7 +453,8 @@ std::size_t getColumnWidth (const FString& s, std::size_t pos)
     }
     catch (const std::out_of_range& ex)
     {
-      std::cerr << "Out of Range error: " << ex.what() << std::endl;
+      *FApplication::getLog() << FLog::Error
+          << "Out of Range error: " << ex.what() << std::endl;
     }
   }
 

src/ftermcap.cpp

@@ -83,7 +83,7 @@ void FTermcap::termcap()
   std::vector<std::string> terminals{};
   static constexpr int success = 1;
   static constexpr int uninitialized = -2;
-  static char term_buffer[2048]{};
+  static char term_buffer[BUF_SIZE]{};
   int status = uninitialized;
   const bool color256 = term_detection->canDisplay256Colors();
 
@@ -116,9 +116,6 @@ void FTermcap::termcap()
     ++iter;
   }
 
-  if ( std::strncmp(termtype, "ansi", 4) == 0 )
-    term_detection->setAnsiTerminal (true);
-
   termcapError (status);
   termcapVariables();
 }
@@ -129,19 +126,21 @@ void FTermcap::termcapError (int status)
   static constexpr int no_entry = 0;
   static constexpr int db_not_found = -1;
   static constexpr int uninitialized = -2;
+  finalcut::FLog& log = *FApplication::getLog();
 
   if ( status == no_entry || status == uninitialized )
   {
     const char* termtype = fterm_data->getTermType();
-    std::cerr << "Unknown terminal: "  << termtype << "\n"
+    log << FLog::Error
-              << "Check the TERM environment variable\n"
+        << "Unknown terminal: "  << termtype << "\n"
-              << "Also make sure that the terminal\n"
+        << "Check the TERM environment variable\n"
-              << "is defined in the termcap/terminfo database.\n";
+        << "Also make sure that the terminal\n"
+        << "is defined in the termcap/terminfo database.\n";
     std::abort();
   }
   else if ( status == db_not_found )
   {
-    std::cerr << "The termcap/terminfo database could not be found.\n";
+    log << "The termcap/terminfo database could not be found.\n";
     std::abort();
   }
 }

src/ftermdetection.cpp

@@ -25,7 +25,9 @@
 #endif
 
 #include "final/emptyfstring.h"
+#include "final/fapplication.h"
 #include "final/fc.h"
+#include "final/flog.h"
 #include "final/fsystem.h"
 #include "final/fterm.h"
 #include "final/ftermdata.h"
@@ -377,6 +379,8 @@ void FTermDetection::detectTerminal()
     if ( ! new_termtype && std::strlen(termtype) == 5 )
       new_termtype = "xterm-16color";
   }
+  else if ( std::strncmp(termtype, "ansi", 4) == 0 )  // ANSI detection
+    terminal_type.ansi = true;
 
   // set the new environment variable TERM
   if ( new_termtype )
@@ -587,9 +591,9 @@ const char* FTermDetection::parseAnswerbackMsg (const char current_termtype[])
   {
     answer_back = new FString(getAnswerbackMsg());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FString");
     return nullptr;
   }
 
@@ -657,9 +661,9 @@ const char* FTermDetection::parseSecDA (const char current_termtype[])
     // Secondary device attributes (SEC_DA) <- decTerminalID string
     sec_da = new FString(getSecDA());
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FString");
     return current_termtype;
   }
 

src/ftermlinux.cpp

@@ -22,8 +22,10 @@
 
 #include <vector>
 
+#include "final/fapplication.h"
 #include "final/fc.h"
 #include "final/fcharmap.h"
+#include "final/flog.h"
 #include "final/fsystem.h"
 #include "final/fterm.h"
 #include "final/ftermcap.h"
@@ -200,7 +202,7 @@ void FTermLinux::init()
   }
   else
   {
-    std::cerr << "can not open the console.\n";
+    FApplication::getLog()->error("Can not open the console.");
     std::abort();
   }
 }
@@ -553,9 +555,9 @@ bool FTermLinux::getScreenFont()
     static constexpr std::size_t data_size = 4 * 32 * 512;
     font.data = new uChar[data_size]();
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FString");
     return false;
   }
 
@@ -605,9 +607,9 @@ bool FTermLinux::getUnicodeMap()
     {
       screen_unicode_map.entries = new struct unipair[count]();
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("unipair[count]");
       return false;
     }
 
@@ -683,9 +685,9 @@ int FTermLinux::setScreenFont ( uChar fontdata[], uInt count
     {
       font.data = new uChar[data_size]();  // Initialize with 0
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("uChar[data_size]");
       return -1;
     }
 

src/ftextview.cpp

@@ -178,6 +178,18 @@ void FTextView::scrollTo (int x, int y)
   updateTerminal();
 }
 
+//----------------------------------------------------------------------
+void FTextView::scrollToBegin()
+{
+  scrollToY (0);
+}
+
+//----------------------------------------------------------------------
+void FTextView::scrollToEnd()
+{
+  scrollToY (int(getRows() - getTextHeight()));
+}
+
 //----------------------------------------------------------------------
 void FTextView::hide()
 {
@@ -363,9 +375,9 @@ void FTextView::onMouseDown (FMouseEvent* ev)
          std::make_shared<FMouseEvent>(fc::MouseDown_Event, p, tp, b);
       FApplication::sendEvent (parent, _ev.get());
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FMouseEvent");
     }
   }
 }
@@ -392,9 +404,9 @@ void FTextView::onMouseUp (FMouseEvent* ev)
             std::make_shared<FMouseEvent>(fc::MouseUp_Event, p, tp, b);
         FApplication::sendEvent (parent, _ev.get());
       }
-      catch (const std::bad_alloc& ex)
+      catch (const std::bad_alloc&)
       {
-        std::cerr << bad_alloc_str << ex.what() << std::endl;
+        badAllocOutput ("FMouseEvent");
       }
     }
   }
@@ -425,9 +437,9 @@ void FTextView::onMouseMove (FMouseEvent* ev)
             std::make_shared<FMouseEvent>(fc::MouseMove_Event, p, tp, b);
         FApplication::sendEvent (parent, _ev.get());
       }
-      catch (const std::bad_alloc& ex)
+      catch (const std::bad_alloc&)
       {
-        std::cerr << bad_alloc_str << ex.what() << std::endl;
+        badAllocOutput ("FMouseEvent");
       }
     }
   }
@@ -577,8 +589,8 @@ inline void FTextView::mapKeyFunctions()
   key_map[fc::Fkey_right] = [this] { scrollBy (1, 0); };
   key_map[fc::Fkey_ppage] = [this] { scrollBy (0, -int(getTextHeight())); };
   key_map[fc::Fkey_npage] = [this] { scrollBy (0, int(getTextHeight())); };
-  key_map[fc::Fkey_home]  = [this] { scrollToY (0); };
+  key_map[fc::Fkey_home]  = [this] { scrollToBegin(); };
-  key_map[fc::Fkey_end]   = [this] { scrollToY (int(getRows() - getTextHeight())); };
+  key_map[fc::Fkey_end]   = [this] { scrollToEnd(); };
 }
 
 //----------------------------------------------------------------------

src/fvterm.cpp

@@ -29,6 +29,7 @@
 #include "final/fcharmap.h"
 #include "final/fcolorpair.h"
 #include "final/fkeyboard.h"
+#include "final/flog.h"
 #include "final/foptiattr.h"
 #include "final/foptimove.h"
 #include "final/fstyle.h"
@@ -690,9 +691,9 @@ void FVTerm::createArea ( const FRect& box
   {
     area = new FTermArea;
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FTermArea");
     return;
   }
 
@@ -1383,9 +1384,9 @@ inline bool FVTerm::reallocateTextArea ( FTermArea* area
     area->changes = new FLineChanges[height];
     area->data    = new FChar[size];
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocFunctionOutput ("FLineChanges[height] or FChar[size]");
     return false;
   }
 
@@ -1404,9 +1405,9 @@ inline bool FVTerm::reallocateTextArea (FTermArea* area, std::size_t size)
   {
     area->data = new FChar[size];
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocFunctionOutput ("FChar[size]");
     return false;
   }
 
@@ -1909,9 +1910,9 @@ void FVTerm::init (bool disable_alt_screen)
     term_pos      = new FPoint(-1, -1);
     output_buffer = new std::queue<int>;
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FTerm, FPoint, or std::queue<int>");
     std::abort();
   }
 

src/fwidget.cpp

@@ -24,6 +24,7 @@
 
 #include "final/fapplication.h"
 #include "final/fevent.h"
+#include "final/flog.h"
 #include "final/fmenubar.h"
 #include "final/fstatusbar.h"
 #include "final/fstring.h"
@@ -1689,9 +1690,9 @@ void FWidget::initRootWidget()
     always_on_top_list = new FWidgetList();
     close_widget       = new FWidgetList();
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocOutput ("FWidgetList");
     return;
   }
 

src/include/final/emptyfstring.h

@@ -27,6 +27,8 @@
   #error "Only <final/final.h> can be included directly."
 #endif
 
+#include "final/fapplication.h"
+#include "final/flog.h"
 #include "final/fstring.h"
 
 namespace finalcut
@@ -51,6 +53,7 @@ public:
   // Disable copy assignment operator (=)
   emptyFString& operator = (const emptyFString&) = delete;
 
+  static const FString getClassName();
   static bool isNull();
   static const FString& get();
   static void clear();
@@ -61,6 +64,10 @@ private:
 };
 
 // emptyFString inline functions
+//----------------------------------------------------------------------
+inline const FString emptyFString::getClassName()
+{ return "emptyFString"; }
+
 //----------------------------------------------------------------------
 inline bool emptyFString::isNull()
 {
@@ -76,9 +83,9 @@ inline const FString& emptyFString::get()
     {
       empty_string = new FString("");
     }
-    catch (const std::bad_alloc& ex)
+    catch (const std::bad_alloc&)
     {
-      std::cerr << bad_alloc_str << ex.what() << std::endl;
+      badAllocOutput ("FString");
     }
   }
 

src/include/final/fapplication.h

@@ -68,11 +68,12 @@ namespace finalcut
 {
 
 // class forward declaration
-class FEvent;
 class FAccelEvent;
 class FCloseEvent;
+class FEvent;
 class FFocusEvent;
 class FKeyEvent;
+class FLog;
 class FMouseEvent;
 class FStartOptions;
 class FTimerEvent;
@@ -106,6 +107,10 @@ class FApplication : public FWidget
     int                   getArgc() const;
     char**                getArgv() const;
     static FApplication*  getApplicationObject();
+    static std::shared_ptr<FLog>& getLog();
+
+    // Mutator
+    static void           setLog (const std::shared_ptr<FLog>&);
 
     // Inquiry
     static bool           isQuit();
@@ -177,6 +182,7 @@ class FApplication : public FWidget
     void                  processMouseEvent();
     void                  processResizeEvent();
     void                  processCloseWidget();
+    void                  processLogger();
     bool                  processNextEvent();
     void                  performTimerAction (FObject*, FEvent*) override;
     static bool           isEventProcessable (const FObject*, const FEvent*);

src/include/final/final.h

@@ -49,6 +49,8 @@
 #include <final/flineedit.h>
 #include <final/flistbox.h>
 #include <final/flistview.h>
+#include <final/flog.h>
+#include <final/flogger.h>
 #include <final/fmenubar.h>
 #include <final/fmenu.h>
 #include <final/fmenuitem.h>

src/include/final/flog.h

@@ -0,0 +1,129 @@
+/***********************************************************************
+* flog.h - Interface of the FINAL CUT logger                           *
+*                                                                      *
+* This file is part of the Final Cut widget toolkit                    *
+*                                                                      *
+* Copyright 2020 Markus Gans                                           *
+*                                                                      *
+* The Final Cut is free software; you can redistribute it and/or       *
+* modify it under the terms of the GNU Lesser General Public License   *
+* as published by the Free Software Foundation; either version 3 of    *
+* the License, or (at your option) any later version.                  *
+*                                                                      *
+* The Final Cut is distributed in the hope that it will be useful,     *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
+* GNU Lesser General Public License for more details.                  *
+*                                                                      *
+* You should have received a copy of the GNU Lesser General Public     *
+* License along with this program.  If not, see                        *
+* <http://www.gnu.org/licenses/>.                                      *
+***********************************************************************/
+
+/*  Standalone class
+ *  ════════════════
+ *
+ * ▕▔▔▔▔▔▔▏
+ * ▕ FLog ▏
+ * ▕▁▁▁▁▁▁▏
+ */
+
+#ifndef FLOG_H
+#define FLOG_H
+
+#if !defined (USE_FINAL_H) && !defined (COMPILE_FINAL_CUT)
+  #error "Only <final/final.h> can be included directly."
+#endif
+
+#include <functional>
+#include <iostream>
+#include <ostream>
+#include <sstream>
+#include <string>
+
+#include <final/fstring.h>
+
+namespace finalcut
+{
+
+using namespace std::placeholders;
+
+//----------------------------------------------------------------------
+// class FLog
+//----------------------------------------------------------------------
+
+class FLog : public std::stringbuf
+{
+  public:
+    // Using-declaration
+    using FLogPrint = std::function<void(const std::string&)>;
+
+    // Enumerations
+    enum LogLevel
+    {
+      Info, Warn, Error, Debug
+    };
+
+    enum LineEnding
+    {
+      LF, CR, CRLF
+    };
+
+
+    // Constructor
+    FLog();
+
+    // Destructor
+    ~FLog() override;
+
+    template <typename T>
+    FLog& operator << (const T& s);
+    FLog& operator << (std::ostream&(*)(std::ostream&));
+    FLog& operator << (LogLevel);
+
+    virtual const FString getClassName() const;
+    virtual void info (const std::string&) = 0;
+    virtual void warn (const std::string&) = 0;
+    virtual void error (const std::string&) = 0;
+    virtual void debug (const std::string&) = 0;
+    virtual void setOutputStream (const std::ostream&) = 0;
+    virtual void setLineEnding (LineEnding) = 0;
+    virtual void enableTimestamp() = 0;
+    virtual void disableTimestamp() = 0;
+
+  protected:
+    int sync() override;
+
+    // Data member
+    LogLevel   level{Info};
+    LineEnding end_of_line{CRLF};
+
+  private:
+    // Data member
+    FLogPrint    current_log{std::bind(&FLog::info, this, _1)};
+    std::ostream stream{this};
+};
+
+// FLog inline functions
+//----------------------------------------------------------------------
+template <typename T>
+inline FLog& FLog::operator << (const T& s)
+{
+  stream << s;
+  return *this;
+}
+
+//----------------------------------------------------------------------
+inline FLog& FLog::operator << (std::ostream&(*pf)(std::ostream&))
+{
+  pf(stream);
+  return *this;
+}
+
+//----------------------------------------------------------------------
+inline const FString FLog::getClassName() const
+{ return "FLog"; }
+
+}  // namespace finalcut
+
+#endif  // FLOG_H

src/include/final/flogger.h

@@ -0,0 +1,138 @@
+/***********************************************************************
+* flogger.h - The FINAL CUT text logger                                *
+*                                                                      *
+* This file is part of the Final Cut widget toolkit                    *
+*                                                                      *
+* Copyright 2020 Markus Gans                                           *
+*                                                                      *
+* The Final Cut is free software; you can redistribute it and/or       *
+* modify it under the terms of the GNU Lesser General Public License   *
+* as published by the Free Software Foundation; either version 3 of    *
+* the License, or (at your option) any later version.                  *
+*                                                                      *
+* The Final Cut is distributed in the hope that it will be useful,     *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
+* GNU Lesser General Public License for more details.                  *
+*                                                                      *
+* You should have received a copy of the GNU Lesser General Public     *
+* License along with this program.  If not, see                        *
+* <http://www.gnu.org/licenses/>.                                      *
+***********************************************************************/
+
+/*  Standalone class
+ *  ════════════════
+ *
+ * ▕▔▔▔▔▔▔▔▔▔▏
+ * ▕ FLogger ▏
+ * ▕▁▁▁▁▁▁▁▁▁▏
+ */
+
+#ifndef FLOGGER_H
+#define FLOGGER_H
+
+#if !defined (USE_FINAL_H) && !defined (COMPILE_FINAL_CUT)
+  #error "Only <final/final.h> can be included directly."
+#endif
+
+#include <functional>
+#include <iostream>
+#include <sstream>
+#include <string>
+
+#include <chrono>
+#include <iomanip>
+
+#include "final/flog.h"
+
+namespace finalcut
+{
+
+//----------------------------------------------------------------------
+// class FLogger
+//----------------------------------------------------------------------
+
+class FLogger : public FLog
+{
+  public:
+    // Constructor
+    FLogger();
+
+    // Destructor
+    ~FLogger() override;
+
+    // Methods
+    const FString getClassName() const override;
+    void info (const std::string&) override;
+    void warn (const std::string&) override;
+    void error (const std::string&) override;
+    void debug (const std::string&) override;
+    void setOutputStream (const std::ostream&) override;
+    void setLineEnding (LineEnding) override;
+    void enableTimestamp() override;
+    void disableTimestamp() override;
+
+  private:
+    // Methods
+    void              newlineReplace (std::string&, const std::string&);
+    const std::string getTimeString();
+    const std::string getEOL();
+    void              printLogLine (const std::string&);
+
+    // Data member
+    bool         timestamp{false};
+    std::ostream output{std::cerr.rdbuf()};
+};
+
+// FLogger inline functions
+//----------------------------------------------------------------------
+inline const FString FLogger::getClassName() const
+{ return "FLogger"; }
+
+//----------------------------------------------------------------------
+inline void FLogger::info (const std::string& msg)
+{
+  level = Info;
+  printLogLine (msg);
+}
+
+//----------------------------------------------------------------------
+inline void FLogger::warn (const std::string& msg)
+{
+  level = Warn;
+  printLogLine (msg);
+}
+
+//----------------------------------------------------------------------
+inline void FLogger::error (const std::string& msg)
+{
+  level = Error;
+  printLogLine (msg);
+}
+
+//----------------------------------------------------------------------
+inline void FLogger::debug (const std::string& msg)
+{
+  level = Debug;
+  printLogLine (msg);
+}
+
+//----------------------------------------------------------------------
+inline void FLogger::setOutputStream (const std::ostream& os)
+{ output.rdbuf(os.rdbuf()); }
+
+//----------------------------------------------------------------------
+inline void FLogger::setLineEnding (LineEnding eol)
+{ end_of_line = eol; }
+
+//----------------------------------------------------------------------
+inline void FLogger::enableTimestamp()
+{ timestamp = true; }
+
+//----------------------------------------------------------------------
+inline void FLogger::disableTimestamp()
+{ timestamp = false; }
+
+}  // namespace finalcut
+
+#endif  // FLOGGER_H

src/include/final/fmessagebox.h

@@ -169,8 +169,8 @@ inline const FString FMessageBox::getClassName() const
 //----------------------------------------------------------------------
 inline const FString FMessageBox::getTitlebarText() const
 {
-  const FString& tb_text = FDialog::getText();  // initialize text
+  const FString& title = FDialog::getText();  // initialize text
-  return tb_text;
+  return title;
 }
 
 //----------------------------------------------------------------------

src/include/final/fobject.h

@@ -48,6 +48,8 @@
 #include <memory>
 #include <vector>
 
+#include "final/fstring.h"
+
 namespace finalcut
 {
 

src/include/final/fscrollbar.h

@@ -50,6 +50,8 @@
 #include <functional>
 #include <memory>
 
+#include "final/fapplication.h"
+#include "final/flog.h"
 #include "final/fwidget.h"
 
 namespace finalcut
@@ -180,9 +182,9 @@ void initScrollbar ( FScrollbarPtr& bar
   {
     bar = std::make_shared<FScrollbar>(o, cb_instance);
   }
-  catch (const std::bad_alloc& ex)
+  catch (const std::bad_alloc&)
   {
-    std::cerr << bad_alloc_str << ex.what() << std::endl;
+    badAllocFunctionOutput ("FScrollbar");
     return;
   }
 

src/include/final/fstartoptions.h

@@ -64,7 +64,7 @@ class FStartOptions final
     FStartOptions& operator = (const FStartOptions&) = delete;
 
     // Accessors
-    const FString getClassName();
+    static const FString getClassName();
     static FStartOptions& getFStartOptions();
 
     // Mutator

src/include/final/fstring.h

@@ -162,7 +162,7 @@ class FString
     operator const char* () const { return c_str(); }
 
     // Accessor
-    virtual const FString getClassName();
+    virtual const FString getClassName() const;
 
     // inquiries
     bool isNull() const;
@@ -370,7 +370,7 @@ inline bool FString::operator > (const CharT& s) const
 }
 
 //----------------------------------------------------------------------
-inline const FString FString::getClassName()
+inline const FString FString::getClassName() const
 { return "FString"; }
 
 //----------------------------------------------------------------------

src/include/final/fsystem.h

@@ -78,5 +78,3 @@ class FSystem
 }  // namespace finalcut
 
 #endif  // FSYSTEM_H
-
-

src/include/final/fterm.h

@@ -173,7 +173,7 @@ class FTerm final
     FTerm& operator = (const FTerm&) = delete;
 
     // Accessors
-    const FString          getClassName() const;
+    static const FString   getClassName();
     static std::size_t     getLineNumber();
     static std::size_t     getColumnNumber();
     static const FString   getKeyName (FKey);
@@ -405,7 +405,7 @@ std::size_t getColumnWidth (const FTermBuffer&);
 
 // FTerm inline functions
 //----------------------------------------------------------------------
-inline const FString FTerm::getClassName() const
+inline const FString FTerm::getClassName()
 { return "FTerm"; }
 
 //----------------------------------------------------------------------

src/include/final/ftermcap.h

@@ -126,6 +126,9 @@ class FTermcap final
     static tcap_map      strings[];
 
   private:
+    // Constant
+    static constexpr std::size_t BUF_SIZE{2048};
+
     // Methods
     static void          termcap();
     static void          termcapError (int);
@@ -140,7 +143,7 @@ class FTermcap final
     static FSystem*        fsystem;
     static FTermData*      fterm_data;
     static FTermDetection* term_detection;
-    static char            string_buf[2048];
+    static char            string_buf[BUF_SIZE];
 };
 
 
@@ -153,35 +156,35 @@ inline const FString FTermcap::getClassName() const
 template<typename CharT>
 bool FTermcap::getFlag (const CharT& cap)
 {
-  return tgetflag(C_STR(cap));
+  return ::tgetflag(C_STR(cap));
 }
 
 //----------------------------------------------------------------------
 template<typename CharT>
 int FTermcap::getNumber (const CharT& cap)
 {
-  return tgetnum(C_STR(cap));
+  return ::tgetnum(C_STR(cap));
 }
 
 //----------------------------------------------------------------------
 template<typename CharT>
 char* FTermcap::getString (const CharT& cap)
 {
-  return tgetstr(C_STR(cap), reinterpret_cast<char**>(&string_buf));
+  return ::tgetstr(C_STR(cap), reinterpret_cast<char**>(&string_buf));
 }
 
 //----------------------------------------------------------------------
 template<typename CharT>
 char* FTermcap::encodeMotionParameter (const CharT& cap, int col, int row)
 {
-  return tgoto(C_STR(cap), col, row);
+  return ::tgoto(C_STR(cap), col, row);
 }
 
 //----------------------------------------------------------------------
 template<typename CharT, typename... Args>
 inline char* FTermcap::encodeParameter (const CharT& cap, Args&&... args)
 {
-  return tparm (C_STR(cap), std::forward<Args>(args)...);
+  return ::tparm (C_STR(cap), std::forward<Args>(args)...);
 }
 
 //----------------------------------------------------------------------

src/include/final/ftermdata.h

@@ -373,5 +373,3 @@ inline void FTermData::setFramebufferBpp (int bpp)
 }  // namespace finalcut
 
 #endif  // FTERMDATA_H
-
-

src/include/final/ftermdetection.h

@@ -91,7 +91,7 @@ class FTermDetection final
     FTermDetection& operator = (const FTermDetection&) = delete;
 
     // Accessor
-    const FString         getClassName() const;
+    static const FString  getClassName();
     static const char*    getTermType();
     static int            getGnomeTerminalID();
     FTerminalType&        getTermTypeStruct();
@@ -240,7 +240,7 @@ struct FTermDetection::secondaryDA
 
 // FTermDetection inline functions
 //----------------------------------------------------------------------
-inline const FString FTermDetection::getClassName() const
+inline const FString FTermDetection::getClassName()
 { return "FTermDetection"; }
 
 //----------------------------------------------------------------------

src/include/final/ftextview.h

@@ -104,6 +104,8 @@ class FTextView : public FWidget
     void                scrollToY (int);
     void                scrollTo (const FPoint&);
     void                scrollTo (int, int);
+    void                scrollToBegin();
+    void                scrollToEnd();
     void                scrollBy (int, int);
 
     // Methods

src/include/final/ftypes.h

@@ -37,6 +37,23 @@
 
 #define null nullptr
 
+#define badAllocFunctionOutput(object_name)                  \
+    *FApplication::getLog() << FLog::Error                   \
+                            << "Not enough memory to alloc " \
+                            << (object_name)                 \
+                            << " in "                        \
+                            << __func__ << std::endl;
+
+#define badAllocOutput(object_name)                          \
+    *FApplication::getLog() << FLog::Error                   \
+                            << "Not enough memory to alloc " \
+                            << (object_name)                 \
+                            << " in "                        \
+                            << getClassName()                \
+                            << "::"                          \
+                            << __func__ << std::endl;
+
+//F_METHOD_CALLBACK
 namespace
 {
 
@@ -69,9 +86,6 @@ typedef void*          FDataPtr;
 namespace finalcut
 {
 
-const char* const bad_alloc_str = \
-    "not enough memory to alloc ";
-
 template <typename T, bool is_signed>
 struct is_negative
 {

src/include/final/fwidget.h

@@ -94,12 +94,12 @@
 #include <utility>
 #include <vector>
 
-#include "final/fvterm.h"
 #include "final/fobject.h"
 #include "final/fpoint.h"
 #include "final/frect.h"
 #include "final/fsize.h"
 #include "final/ftypes.h"
+#include "final/fvterm.h"
 
 // Callback macros
 #define F_FUNCTION_CALLBACK(h) \

test/Makefile.am

@@ -21,6 +21,7 @@ noinst_PROGRAMS = \
 	fcolorpair_test \
 	fstyle_test \
 	fstring_test \
+	flogger_test \
 	fsize_test \
 	fpoint_test \
 	frect_test
@@ -39,6 +40,7 @@ foptiattr_test_SOURCES = foptiattr-test.cpp
 fcolorpair_test_SOURCES = fcolorpair-test.cpp
 fstyle_test_SOURCES = fstyle-test.cpp
 fstring_test_SOURCES = fstring-test.cpp
+flogger_test_SOURCES = flogger-test.cpp
 fsize_test_SOURCES = fsize-test.cpp
 fpoint_test_SOURCES = fpoint-test.cpp
 frect_test_SOURCES = frect-test.cpp
@@ -57,6 +59,7 @@ TESTS = fobject_test \
 	fcolorpair_test \
 	fstyle_test \
 	fstring_test \
+	flogger_test \
 	fsize_test \
 	fpoint_test \
 	frect_test

test/flogger-test.cpp

@@ -0,0 +1,353 @@
+/***********************************************************************
+* flogger-test.cpp - FLogger unit tests                                *
+*                                                                      *
+* This file is part of the Final Cut widget toolkit                    *
+*                                                                      *
+* Copyright 2020 Markus Gans                                           *
+*                                                                      *
+* The Final Cut is free software; you can redistribute it and/or       *
+* modify it under the terms of the GNU Lesser General Public License   *
+* as published by the Free Software Foundation; either version 3 of    *
+* the License, or (at your option) any later version.                  *
+*                                                                      *
+* The Final Cut is distributed in the hope that it will be useful,     *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
+* GNU Lesser General Public License for more details.                  *
+*                                                                      *
+* You should have received a copy of the GNU Lesser General Public     *
+* License along with this program.  If not, see                        *
+* <http://www.gnu.org/licenses/>.                                      *
+***********************************************************************/
+
+#include <cppunit/BriefTestProgressListener.h>
+#include <cppunit/CompilerOutputter.h>
+#include <cppunit/extensions/HelperMacros.h>
+#include <cppunit/TestFixture.h>
+#include <cppunit/TestResult.h>
+#include <cppunit/TestResultCollector.h>
+#include <cppunit/TestRunner.h>
+
+#include <sstream>
+
+#include <final/final.h>
+
+//----------------------------------------------------------------------
+// class FLoggerTest
+//----------------------------------------------------------------------
+class myLogger : public finalcut::FLog
+{
+  public:
+    void info (const std::string& entry) override
+    {
+      output << " Info: " << entry << std::endl;
+    }
+
+    void warn (const std::string& entry) override
+    {
+      output << " Warn: " << entry << std::endl;
+    }
+
+    void error (const std::string& entry) override
+    {
+      output << "Error: " << entry << std::endl;
+    }
+
+    void debug (const std::string& entry) override
+    {
+      output << "Debug: " << entry << std::endl;
+    }
+
+    void setOutputStream (const std::ostream& os) override
+    { output.rdbuf(os.rdbuf()); }
+
+    void setLineEnding (LineEnding) override
+    { }
+
+    void enableTimestamp() override
+    { }
+
+    void disableTimestamp() override
+    { }
+
+  private:
+    // Data member
+    std::ostream output{std::cerr.rdbuf()};
+};
+
+//----------------------------------------------------------------------
+// class FLoggerTest
+//----------------------------------------------------------------------
+
+class FLoggerTest : public CPPUNIT_NS::TestFixture
+{
+  public:
+    FLoggerTest()
+    { }
+
+  protected:
+    void classNameTest();
+    void defaultObjectTest();
+    void lineEndingTest();
+    void timestampTest();
+    void fileTest();
+    void applicationObjectTest();
+
+  private:
+    // Adds code needed to register the test suite
+    CPPUNIT_TEST_SUITE (FLoggerTest);
+
+    // Add a methods to the test suite
+    CPPUNIT_TEST (classNameTest);
+    CPPUNIT_TEST (defaultObjectTest);
+    CPPUNIT_TEST (lineEndingTest);
+    CPPUNIT_TEST (timestampTest);
+    CPPUNIT_TEST (fileTest);
+    CPPUNIT_TEST (applicationObjectTest);
+
+    // End of test suite definition
+    CPPUNIT_TEST_SUITE_END();
+};
+
+//----------------------------------------------------------------------
+void FLoggerTest::classNameTest()
+{
+  finalcut::FLogger log;
+  const finalcut::FString& classname = log.getClassName();
+  CPPUNIT_ASSERT ( classname == "FLogger" );
+}
+
+//----------------------------------------------------------------------
+void FLoggerTest::defaultObjectTest()
+{
+  finalcut::FLogger log{};
+  std::ostringstream buf{};
+  log.setOutputStream(buf);
+  log << "Hello, World!" << std::flush;  // Default level is "Info"
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << "Hel" << "lo," << " Wor" << "ld!" << std::flush;  // Several parts
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << "Hello, World!" << std::endl;  // std::endl
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Hello, World!\n\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << finalcut::FLog::Info << "Hello, World!" << std::flush;
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << finalcut::FLog::Warn << "Hello, World!" << std::flush;
+  CPPUNIT_ASSERT ( buf.str() == "[WARNING] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << "Hello, World!" << std::flush;  // Last level was "Warn"
+  CPPUNIT_ASSERT ( buf.str() == "[WARNING] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << finalcut::FLog::Error << "Hello, World!" << std::flush;
+  CPPUNIT_ASSERT ( buf.str() == "[ERROR] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << "Hello, World!" << std::flush;  // Last level was "Error"
+  CPPUNIT_ASSERT ( buf.str() == "[ERROR] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << finalcut::FLog::Debug << "Hello, World!" << std::flush;
+  CPPUNIT_ASSERT ( buf.str() == "[DEBUG] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log << "Hello, World!" << std::flush;  // Last level was "Debug"
+  CPPUNIT_ASSERT ( buf.str() == "[DEBUG] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  // Without stream
+  log.info("Hello, World!");
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log.warn("Hello, World!");
+  CPPUNIT_ASSERT ( buf.str() == "[WARNING] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log.error("Hello, World!");
+  CPPUNIT_ASSERT ( buf.str() == "[ERROR] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+
+  log.debug("Hello, World!");
+  CPPUNIT_ASSERT ( buf.str() == "[DEBUG] Hello, World!\r\n" );
+  buf.str("");  // Clear buffer
+}
+
+//----------------------------------------------------------------------
+void FLoggerTest::lineEndingTest()
+{
+  finalcut::FLogger log{};
+  std::ostringstream buf{};
+  log.setOutputStream(buf);
+
+  log.info("Line endings");  // Default = CRLF
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Line endings\r\n" );
+  buf.str("");  // Clear buffer
+
+  log.setLineEnding(finalcut::FLog::LF);
+  log.warn("Line endings");
+  CPPUNIT_ASSERT ( buf.str() == "[WARNING] Line endings\n" );
+  buf.str("");  // Clear buffer
+
+  log.setLineEnding(finalcut::FLog::CR);
+  log.error("Line endings");
+  CPPUNIT_ASSERT ( buf.str() == "[ERROR] Line endings\r" );
+  buf.str("");  // Clear buffer
+
+  log.setLineEnding(finalcut::FLog::CRLF);
+  log.debug("Line endings");
+  CPPUNIT_ASSERT ( buf.str() == "[DEBUG] Line endings\r\n" );
+  buf.str("");  // Clear buffer
+}
+
+//----------------------------------------------------------------------
+void FLoggerTest::timestampTest()
+{
+  finalcut::FLogger log{};
+  std::ostringstream buf{};
+  log.setOutputStream(buf);
+
+  log.info("Timestamp");
+  std::size_t length = buf.str().length();
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Timestamp\r\n" );
+  CPPUNIT_ASSERT ( length == 18 );
+  buf.str("");  // Clear buffer
+
+  log.enableTimestamp();
+  log.info("Timestamp");
+  length = buf.str().length();
+  CPPUNIT_ASSERT ( buf.str().substr(length - 18) == "[INFO] Timestamp\r\n" );
+  CPPUNIT_ASSERT ( length > 40 );
+  buf.str("");  // Clear buffer
+
+  log.disableTimestamp();
+  log.info("Timestamp");
+  length = buf.str().length();
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] Timestamp\r\n" );
+  CPPUNIT_ASSERT ( length == 18 );
+  buf.str("");  // Clear buffer
+}
+
+//----------------------------------------------------------------------
+void FLoggerTest::fileTest()
+{
+  std::string filename = "test.log";
+
+  {
+    finalcut::FLogger log{};
+    std::ofstream file_stream(filename, std::ofstream::out);
+    log.setLineEnding (finalcut::FLog::LF);
+    log.setOutputStream(file_stream);
+
+    log.info("test1");
+    log.warn("test2");
+    log.error("test3");
+    log.debug("test4");
+    log << finalcut::FLog::Info << "streaming test1";
+    log << finalcut::FLog::Warn << "streaming test2";
+    log << finalcut::FLog::Error << "streaming test3";
+    log << finalcut::FLog::Debug << "streaming test4" << std::flush;
+
+    if ( file_stream.is_open() )
+      file_stream.close();
+  }  // End of logging
+
+
+  std::string strings[] =
+  {
+    "[INFO] test1",
+    "[WARNING] test2",
+    "[ERROR] test3",
+    "[DEBUG] test4",
+    "[INFO] streaming test1",
+    "[WARNING] streaming test2",
+    "[ERROR] streaming test3",
+    "[DEBUG] streaming test4",
+    ""
+  };
+
+  std::string line{};
+  std::ifstream file_stream{filename};
+  std::size_t i{0};
+
+  while ( ! file_stream.eof() && file_stream.good() )
+  {
+    getline(file_stream, line);
+    CPPUNIT_ASSERT ( line == strings[i] );
+    i++;
+  }
+
+  if ( file_stream.is_open() )
+    file_stream.close();
+
+  remove("test.log");  // Delete file
+}
+
+//----------------------------------------------------------------------
+void FLoggerTest::applicationObjectTest()
+{
+  std::shared_ptr<finalcut::FLog> log = finalcut::FApplication::getLog();
+  std::ostringstream buf{};
+  log->setOutputStream(buf);
+
+  log->info("test1");
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] test1\r\n" );
+  buf.str("");  // Clear buffer
+
+  log->warn("test2");
+  CPPUNIT_ASSERT ( buf.str() == "[WARNING] test2\r\n" );
+  buf.str("");  // Clear buffer
+
+  log->error("test3");
+  CPPUNIT_ASSERT ( buf.str() == "[ERROR] test3\r\n" );
+  buf.str("");  // Clear buffer
+
+  log->debug("test4");
+  CPPUNIT_ASSERT ( buf.str() == "[DEBUG] test4\r\n" );
+  buf.str("");  // Clear buffer
+
+  *log << "test5" << std::flush;
+  CPPUNIT_ASSERT ( buf.str() == "[INFO] test5\r\n" );
+  buf.str("");  // Clear buffer
+
+  *log << finalcut::FLog::Error << "test6" << std::flush;
+  CPPUNIT_ASSERT ( buf.str() == "[ERROR] test6\r\n" );
+  buf.str("");  // Clear buffer
+
+  // Replace the logger with another one
+  finalcut::FApplication::setLog(std::make_shared<myLogger>());
+  log = finalcut::FApplication::getLog();
+  log->setOutputStream(buf);
+
+  log->info("myLogger 1");
+  CPPUNIT_ASSERT ( buf.str() == " Info: myLogger 1\n" );
+  buf.str("");  // Clear buffer
+
+  log->warn("myLogger 2");
+  CPPUNIT_ASSERT ( buf.str() == " Warn: myLogger 2\n" );
+  buf.str("");  // Clear buffer
+
+  log->error("myLogger 3");
+  CPPUNIT_ASSERT ( buf.str() == "Error: myLogger 3\n" );
+  buf.str("");  // Clear buffer
+
+  log->debug("myLogger 4");
+  CPPUNIT_ASSERT ( buf.str() == "Debug: myLogger 4\n" );
+  buf.str("");  // Clear buffer
+}
+
+
+// Put the test suite in the registry
+CPPUNIT_TEST_SUITE_REGISTRATION (FLoggerTest);
+
+// The general unit test main part
+#include <main-test.inc>
+