Add emacs-like redo.

nonlib/Loggable.C

@@ -541,6 +541,15 @@ Loggable::undo ( void )
     
 }
 
+void
+Loggable::redo ( void )
+{
+    if (! _fp)
+      return;
+
+    _undo_offset = ftell( _fp );
+}
+
 /** write a snapshot of the current state of all loggable objects to
  * file handle /fp/ */
 bool

nonlib/Loggable.H

@@ -177,6 +177,7 @@ public:
     static bool open ( const char *filename );
     static bool close ( void );
     static void undo ( void );
+    static void redo ( void );
 
     static void compact ( void );
 

timeline/src/Project.C

@@ -134,6 +134,12 @@ Project::undo ( void )
     Loggable::undo();
 }
 
+void
+Project::redo ( void )
+{
+    Loggable::redo();
+}
+
 bool
 Project::read_info ( int *version, nframes_t *sample_rate, char **creation_date, char **created_by )
 {

timeline/src/Project.H

@@ -62,5 +62,6 @@ public:
     static bool open ( void ) { return _is_open; }
     static bool create ( const char *name, const char *template_name );
     static void undo ( void );
+    static void redo ( void );
     static const char *created_on ( void ) { return _created_on; }
 };

timeline/src/TLE.fl

@@ -456,7 +456,12 @@ free(path);}
             MenuItem {} {
               label Undo
               callback {timeline->command_undo();}
-              xywh {5 5 40 25} shortcut 0x4007a divider
+              xywh {5 5 40 25} shortcut 0x4007a
+            }
+            MenuItem {} {
+              label Redo
+              callback {timeline->command_redo();}
+              xywh {5 5 40 25} shortcut 0x40079 divider
             }
             MenuItem {} {
               label {Select None}

timeline/src/Timeline.C

@@ -2088,6 +2088,15 @@ Timeline::command_undo ( void )
     track_lock.unlock();
 }
 
+void
+Timeline::command_redo ( void )
+{
+    /* FIXME: sequence lock too? */
+    track_lock.wrlock();
+    Project::redo();
+    track_lock.unlock();
+}
+
 bool
 Timeline::command_load ( const char *name, const char *display_name )
 {

timeline/src/Timeline.H

@@ -246,6 +246,7 @@ public:
     void command_move_track_up ( Track *track );
     void command_move_track_down ( Track *track );
     void command_undo ( void );
+    void command_redo ( void );
 
     int find_track ( const Track * track ) const;