CLI action to pretty print JSON

onos> intents -s -j | pp

Change-Id: Iaf398711dfe65acaf517a52cd9ce638d3f30bafb
diff --git a/cli/src/main/java/org/onosproject/cli/PrettyJson.java b/cli/src/main/java/org/onosproject/cli/PrettyJson.java
new file mode 100644
index 0000000..a482cf3
--- /dev/null
+++ b/cli/src/main/java/org/onosproject/cli/PrettyJson.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * 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 org.apache.karaf.shell.commands.Command;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+
+/**
+ * Pretty print previous command output JSON.
+ */
+@Command(scope = "onos", name = "pp",
+         description = "Pretty print JSON output from previous command")
+public class PrettyJson extends AbstractShellCommand {
+
+    @Override
+    protected void execute() {
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            mapper.enable(SerializationFeature.INDENT_OUTPUT);
+
+            String json = mapper.writerWithDefaultPrettyPrinter()
+                        .writeValueAsString(mapper.readTree(System.in));
+
+            print("%s", json);
+        } catch (IOException e) {
+            log.error("Failed parsing JSON.", 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 1d53f47..0200f5f 100644
--- a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -16,6 +16,11 @@
 <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">
 
     <command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0">
+
+        <command>
+            <action class="org.onosproject.cli.PrettyJson"/>
+        </command>
+
         <command>
             <action class="org.onosproject.cli.SummaryCommand"/>
         </command>