CLI helper to pretty-print XML

Change-Id: Ib8012f1445e9e5d06eee13a5cfd0cb163e23e744
diff --git a/cli/src/main/java/org/onosproject/cli/PrettyXml.java b/cli/src/main/java/org/onosproject/cli/PrettyXml.java
new file mode 100644
index 0000000..9b3635f
--- /dev/null
+++ b/cli/src/main/java/org/onosproject/cli/PrettyXml.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.cli;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+import org.apache.karaf.shell.commands.Command;
+import org.onlab.util.XmlString;
+
+import com.google.common.io.CharStreams;
+
+/**
+ * Pretty print previous command output XML.
+ */
+@Command(scope = "onos", name = "ppxml",
+         description = "Pretty print XML output from previous command")
+public class PrettyXml extends AbstractShellCommand {
+
+    @Override
+    protected void execute() {
+        try {
+            String xmlS = CharStreams.toString(new InputStreamReader(System.in));
+
+            print("%s", XmlString.prettifyXml(xmlS));
+        } catch (IOException e) {
+            log.error("Failed parsing XML.", e);
+            print("%s", e);
+        }
+    }
+
+}
diff --git a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index bc33931..27e2b4f 100644
--- a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -26,6 +26,10 @@
         </command>
 
         <command>
+            <action class="org.onosproject.cli.PrettyXml"/>
+        </command>
+
+        <command>
             <action class="org.onosproject.cli.SummaryCommand"/>
         </command>
         <command>