| /** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.karaf.shell.console; |
| |
| import java.io.PrintStream; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.SortedMap; |
| import java.util.TreeMap; |
| |
| import jline.Terminal; |
| import org.apache.felix.gogo.commands.Action; |
| import org.apache.felix.gogo.commands.Argument; |
| import org.apache.felix.gogo.commands.Command; |
| import org.apache.felix.gogo.commands.basic.AbstractCommand; |
| import org.apache.felix.gogo.commands.basic.DefaultActionPreparator; |
| import org.apache.felix.service.command.Function; |
| import org.fusesource.jansi.Ansi; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceReference; |
| |
| /** |
| * Displays help on the available commands |
| */ |
| @Command(scope = "*", name = "help", description = "Displays this help or help about a command") |
| public class HelpAction extends AbstractAction { |
| |
| @Argument(name = "command", required = false, description = "The command to get help for") |
| private String command; |
| |
| public Object doExecute() throws Exception { |
| if (command == null) { |
| Set<String> names = (Set<String>) session.get(".commands"); |
| if (!names.isEmpty()) { |
| Terminal term = (Terminal) session.get(".jline.terminal"); |
| PrintStream out = System.out; |
| SortedMap<String,String> commands = new TreeMap<String,String>(); |
| for (String name : names) { |
| String description = null; |
| Function function = (Function) session.get(name); |
| function = unProxy(function); |
| if (function instanceof AbstractCommand) { |
| try { |
| Method mth = AbstractCommand.class.getDeclaredMethod("createNewAction"); |
| mth.setAccessible(true); |
| Action action = (Action) mth.invoke(function); |
| Class<? extends Action> clazz = action.getClass(); |
| Command ann = clazz.getAnnotation(Command.class); |
| description = ann.description(); |
| } catch (Throwable e) { |
| } |
| if (name.startsWith("*:")) { |
| name = name.substring(2); |
| } |
| commands.put(name, description); |
| } |
| } |
| // Post process the commands list |
| |
| out.println(Ansi.ansi().a(Ansi.Attribute.INTENSITY_BOLD).a("COMMANDS").a(Ansi.Attribute.RESET)); |
| for (Map.Entry<String,String> entry : commands.entrySet()) { |
| out.print(" "); |
| String key = NameScoping.getCommandNameWithoutGlobalPrefix(session, entry.getKey()); |
| out.println(Ansi.ansi().a(Ansi.Attribute.INTENSITY_BOLD).a(key).a(Ansi.Attribute.RESET)); |
| if (entry.getValue() != null) { |
| DefaultActionPreparator.printFormatted(" ", entry.getValue(), term != null ? term.getWidth() : 80, out); |
| } |
| } |
| out.println(); |
| } |
| return null; |
| } else { |
| return session.execute(command + " --help"); |
| } |
| } |
| |
| protected Function unProxy(Function function) { |
| try { |
| if (function.getClass().getName().contains("CommandProxy")) { |
| Field contextField = function.getClass().getDeclaredField("context"); |
| Field referenceField = function.getClass().getDeclaredField("reference"); |
| contextField.setAccessible(true); |
| referenceField.setAccessible(true); |
| BundleContext context = (BundleContext) contextField.get(function); |
| ServiceReference reference = (ServiceReference) referenceField.get(function); |
| Object target = context.getService(reference); |
| try { |
| if (target instanceof Function) { |
| function = (Function) target; |
| } |
| } finally { |
| context.ungetService(reference); |
| } |
| } |
| } catch (Throwable t) { |
| } |
| return function; |
| } |
| |
| } |