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diff --git a/src/commands/segment/SegmentEraseCommand.cpp b/src/commands/segment/SegmentEraseCommand.cpp
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+++ b/src/commands/segment/SegmentEraseCommand.cpp
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+ 
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+ 
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+
+#include "SegmentEraseCommand.h"
+
+#include <klocale.h>
+#include "misc/Debug.h"
+#include "base/Composition.h"
+#include "base/Segment.h"
+#include "sound/AudioFile.h"
+#include "sound/AudioFileManager.h"
+
+
+namespace Rosegarden
+{
+
+SegmentEraseCommand::SegmentEraseCommand(Segment *segment) :
+        KNamedCommand(i18n("Erase Segment")),
+        m_composition(segment->getComposition()),
+        m_segment(segment),
+        m_mgr(0),
+        m_audioFileName(""),
+        m_detached(false)
+{
+    // nothing else
+}
+
+SegmentEraseCommand::SegmentEraseCommand(Segment *segment,
+        AudioFileManager *mgr) :
+        KNamedCommand(i18n("Erase Segment")),
+        m_composition(segment->getComposition()),
+        m_segment(segment),
+        m_mgr(mgr),
+        m_detached(false)
+{
+    // If this is an audio segment, we want to make a note of
+    // its associated file name in case we need to undo and restore
+    // the file.
+    if (m_segment->getType() == Segment::Audio) {
+        unsigned int id = m_segment->getAudioFileId();
+        AudioFile *file = mgr->getAudioFile(id);
+        if (file)
+            m_audioFileName = file->getFilename();
+    }
+}
+
+SegmentEraseCommand::~SegmentEraseCommand()
+{
+    // This is the only place in this command that the Segment can
+    // safely be deleted, and then only if it is not in the
+    // Composition (i.e. if we executed more recently than we
+    // unexecuted).  Can't safely call through the m_segment pointer
+    // here; someone else might have got to it first
+
+    if (m_detached) {
+        delete m_segment;
+    }
+}
+
+void
+SegmentEraseCommand::execute()
+{
+    m_composition->detachSegment(m_segment);
+    m_detached = true;
+}
+
+void
+SegmentEraseCommand::unexecute()
+{
+    m_composition->addSegment(m_segment);
+    m_detached = false;
+
+    if (m_segment->getType() == Segment::Audio &&
+            m_audioFileName != "" &&
+            m_mgr) {
+        int id = m_mgr->fileExists(m_audioFileName);
+
+        RG_DEBUG << "SegmentEraseCommand::unexecute: file is " << m_audioFileName << endl;
+
+        if (id == -1)
+            id = (int)m_mgr->addFile(m_audioFileName);
+        m_segment->setAudioFileId(id);
+    }
+}
+
+}