Mixer: Warn if user attempts to quit without saving.

Mixer/Mixer.C

@@ -566,6 +566,14 @@ Mixer::command_new ( const char *path, const char *display_name )
 void
 Mixer::command_quit ( void )
 {
+    if ( Loggable::dirty() )
+    {
+        int i = fl_choice( "There have been changes since the last save. Quitting now will discard them", "Discard", "Cancel", NULL );
+
+        if ( i != 0 )
+            return;
+    }
+
     quit();
 }
 

Mixer/Project.C

@@ -172,8 +172,11 @@ Project::save ( void )
 
 //    tle->save_timeline_settings();
 
-    return mixer->save();
+    int r = mixer->save();
 
+    Loggable::clear_dirty();
+
+    return r;
 //    return Loggable::save_unjournaled_state();
 }
 
@@ -279,7 +282,7 @@ Project::open ( const char *name )
 
 //    timeline->zoom_fit();
 
-
+    Loggable::clear_dirty();
 
     MESSAGE( "Loaded project \"%s\"", name );
 

nonlib/Loggable.C

@@ -45,7 +45,7 @@ using std::max;
 FILE *Loggable::_fp;
 unsigned int Loggable::_log_id = 0;
 int Loggable::_level = 0;
-
+int Loggable::_dirty = 0;
 off_t Loggable::_undo_offset = 0;
 
 std::map <unsigned int, Loggable::log_pair > Loggable::_loggables;
@@ -686,6 +686,8 @@ Loggable::log_end ( void )
         log( "%s 0x%X set ", class_name(), _id );
 
         log_print( _old_state, new_state );
+
+        ++_dirty;
     }
 
     delete new_state;
@@ -703,6 +705,8 @@ Loggable::log_end ( void )
 void
 Loggable::log_create ( void ) const
 {
+    ++_dirty;
+
     if ( ! _fp )
         /* replaying, don't bother */
         return;
@@ -753,6 +757,8 @@ Loggable::log_destroy ( void ) const
     /* the unjournaled state may have changed: make a note of it. */
     record_unjournaled();
 
+    ++_dirty;
+
     if ( ! _fp )
         /* tearing down... don't bother */
         return;

nonlib/Loggable.H

@@ -95,6 +95,8 @@ private:
 
     int _nest;
 
+    static int _dirty;                                                 /* count of changes */
+
     static void ensure_size ( size_t n );
 
     void log_print ( const Log_Entry *o, const Log_Entry *n ) const;
@@ -183,6 +185,9 @@ public:
 
     static bool do_this ( const char *s, bool reverse );
 
+    static int dirty ( void ) { return _dirty; }
+    static void clear_dirty ( void ) { _dirty = 0; }
+
     void log_create  ( void ) const;
 
 protected: