From 93b37de367b368cd417ad85ba3a6be34daa27ad0 Mon Sep 17 00:00:00 2001
From: Koen Aers <koen.aers@gmail.com>
Date: Mon, 6 Oct 2014 18:47:06 +0200
Subject: [PATCH] JBIDE-18179: Implement CursorDown

---
 .../aesh/core/internal/ansi/CursorDown.java   | 23 +++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/plugins/org.jboss.tools.aesh.core/src/org/jboss/tools/aesh/core/internal/ansi/CursorDown.java b/plugins/org.jboss.tools.aesh.core/src/org/jboss/tools/aesh/core/internal/ansi/CursorDown.java
index 6d5734d39..248819f20 100644
--- a/plugins/org.jboss.tools.aesh.core/src/org/jboss/tools/aesh/core/internal/ansi/CursorDown.java
+++ b/plugins/org.jboss.tools.aesh.core/src/org/jboss/tools/aesh/core/internal/ansi/CursorDown.java
@@ -6,15 +6,34 @@
  */
 package org.jboss.tools.aesh.core.internal.ansi;
 
-
+import org.jboss.tools.aesh.core.document.Document;
 
 public class CursorDown extends AbstractCommand {
 
-	public CursorDown(String arguments) {}
+	private int amount = 1;
+	
+	public CursorDown(String arguments) {
+		if (!"".equals(arguments)) {
+			amount = Integer.valueOf(arguments);
+		}
+	}
 
 	@Override
 	public CommandType getType() {
 		return CommandType.CURSOR_DOWN;
 	}
 
+	public void handle(Document document) {
+		int currentOffset = document.getCursorOffset();
+		int currentLine = document.getLineOfOffset(currentOffset);
+		int newLine = currentLine + amount;
+		int lastLine = document.getLineOfOffset(document.getLength());
+		if (newLine <= lastLine) {
+			int currentColumn = Math.min(
+					currentOffset - document.getLineOffset(currentLine),
+					document.getLineLength(newLine));
+			int newOffset = document.getLineOffset(newLine) + currentColumn; 
+			document.moveCursorTo(newOffset);
+		}
+ 	}
 }