Add the signed-off in the commit text dialog

index 97aa60f..6aff07e 100644
@@ -172,7 +172,7 @@ private void performCommit(CommitDialog commitDialog, String commitMessage)
 		}
 
 		try {
-			commitMessage = doCommits(commitDialog, commitMessage, treeMap);
+			doCommits(commitDialog, commitMessage, treeMap);
 		} catch (IOException e) {
 			throw new TeamException("Committing changes", e);
 		}

@@ -181,7 +181,7 @@ private void performCommit(CommitDialog commitDialog, String commitMessage)
 		}
 	}
 
-	private String doCommits(CommitDialog commitDialog, String commitMessage,
+	private void doCommits(CommitDialog commitDialog, String commitMessage,
 			HashMap<Repository, Tree> treeMap) throws IOException, TeamException {
 
 		String author = commitDialog.getAuthor();

@@ -209,11 +209,6 @@ private String doCommits(CommitDialog commitDialog, String commitMessage,
 			}
 			Commit commit = new Commit(repo, parentIds);
 			commit.setTree(tree);
-			commitMessage = commitMessage.replaceAll("\r", "\n");
-			if (commitDialog.isSignedOff())
-				commitMessage += "\n\nSigned-off-by: " + committerIdent.getName() + " <"
-								+ committerIdent.getEmailAddress() + ">";
-
 			commit.setMessage(commitMessage);
 			commit.setAuthor(new PersonIdent(authorIdent, commitDate, timeZone));
 			commit.setCommitter(new PersonIdent(committerIdent, commitDate, timeZone));

@@ -229,7 +224,6 @@ private String doCommits(CommitDialog commitDialog, String commitMessage,
 						+ " to commit " + commit.getCommitId() + ".");
 			}
 		}
-		return commitMessage;
 	}
 
 	private void prepareTrees(IFile[] selectedItems,

index 9d062cc..8f85c08 100644
@@ -17,6 +17,7 @@
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.Iterator;
+import java.util.regex.Pattern;
 
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;

@@ -67,6 +68,8 @@
  */
 public class CommitDialog extends Dialog {
 
+	private static Pattern signedOffPattern = Pattern.compile("(.|\r|\n)*Signed-off-by: .*(\r|\n)*"); //$NON-NLS-1$
+
 	class CommitContentProvider implements IStructuredContentProvider {
 
 		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {

@@ -214,6 +217,30 @@ public void widgetDefaultSelected(SelectionEvent arg0) {
 		signedOffButton.setText(UIText.CommitDialog_AddSOB);
 		signedOffButton.setLayoutData(GridDataFactory.fillDefaults().grab(true, false).span(2, 1).create());
 
+		signedOffButton.addSelectionListener(new SelectionListener() {
+			boolean alreadySigned = false;
+			public void widgetSelected(SelectionEvent arg0) {
+				if (alreadySigned)
+					return;
+				if (signedOffButton.getSelection()) {
+					alreadySigned = true;
+					String curText = commitText.getText();
+
+					// add new lines if necessary
+					if (!curText.endsWith(Text.DELIMITER))
+						curText += Text.DELIMITER;
+
+					// if the last line is not a signed off (amend a commit), add a line break
+					if (!signedOffPattern.matcher(new StringBuilder(curText)).matches())
+						curText += Text.DELIMITER;
+					commitText.setText(curText + "Signed-off-by: " + committerText.getText()); //$NON-NLS-1$
+				}
+			}
+
+			public void widgetDefaultSelected(SelectionEvent arg0) {
+				// Empty
+			}
+		});
 		Table resourcesTable = new Table(container, SWT.H_SCROLL | SWT.V_SCROLL
 				| SWT.FULL_SELECTION | SWT.MULTI | SWT.CHECK | SWT.BORDER);
 		resourcesTable.setLayoutData(GridDataFactory.fillDefaults().hint(600,

@@ -330,7 +357,7 @@ private static String getFileStatus(IFile file) {
 	 * @return The message the user entered
 	 */
 	public String getCommitMessage() {
-		return commitMessage;
+		return commitMessage.replaceAll(Text.DELIMITER, "\n"); //$NON-NLS-1$;
 	}
 
 	/**