| /** |
| * |
| * 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.help; |
| |
| import java.io.ByteArrayOutputStream; |
| 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.Command; |
| import org.apache.felix.gogo.commands.basic.AbstractCommand; |
| import org.apache.felix.gogo.commands.basic.DefaultActionPreparator; |
| import org.apache.felix.gogo.runtime.CommandSessionImpl; |
| import org.apache.felix.service.command.CommandSession; |
| import org.apache.felix.service.command.Function; |
| import org.apache.karaf.shell.console.HelpProvider; |
| import org.apache.karaf.shell.console.NameScoping; |
| import org.fusesource.jansi.Ansi; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceReference; |
| |
| public class CommandListHelpProvider implements HelpProvider { |
| |
| public String getHelp(CommandSession session, String path) { |
| if (path.indexOf('|') > 0) { |
| if (path.startsWith("command-list|")) { |
| path = path.substring("command-list|".length()); |
| } else { |
| return null; |
| } |
| } |
| SortedMap<String, String> commands = getCommandDescriptions(session, path); |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| printMethodList(session, new PrintStream(baos), commands); |
| return baos.toString(); |
| } |
| |
| private SortedMap<String, String> getCommandDescriptions(CommandSession session, String command) { |
| Set<String> names = (Set<String>) session.get(CommandSessionImpl.COMMANDS); |
| SortedMap<String,String> commands = new TreeMap<String,String>(); |
| for (String name : names) { |
| if (command != null && !name.startsWith(command)) { |
| continue; |
| } |
| 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); |
| } |
| } |
| return commands; |
| } |
| |
| protected void printMethodList(CommandSession session, PrintStream out, SortedMap<String, String> commands) { |
| Terminal term = (Terminal) session.get(".jline.terminal"); |
| out.println(Ansi.ansi().a(Ansi.Attribute.INTENSITY_BOLD).a("COMMANDS").a(Ansi.Attribute.RESET)); |
| int max = 0; |
| for (Map.Entry<String,String> entry : commands.entrySet()) { |
| String key = NameScoping.getCommandNameWithoutGlobalPrefix(session, entry.getKey()); |
| max = Math.max(max,key.length()); |
| } |
| int margin = 4; |
| String prefix1 = " "; |
| if (term != null && term.getWidth() - max - prefix1.length() - margin > 50) { |
| String prefix2 = prefix1; |
| for (int i = 0; i < max + margin; i++) { |
| prefix2 += " "; |
| } |
| for (Map.Entry<String,String> entry : commands.entrySet()) { |
| out.print(prefix1); |
| String key = NameScoping.getCommandNameWithoutGlobalPrefix(session, entry.getKey()); |
| out.print(Ansi.ansi().a(Ansi.Attribute.INTENSITY_BOLD).a(key).a(Ansi.Attribute.RESET)); |
| for (int i = 0; i < max - key.length() + margin; i++) { |
| out.print(' '); |
| } |
| if (entry.getValue() != null) { |
| DefaultActionPreparator.printFormatted(prefix2, entry.getValue(), term.getWidth(), out, false); |
| } |
| } |
| } else { |
| String prefix2 = prefix1 + prefix1; |
| for (Map.Entry<String,String> entry : commands.entrySet()) { |
| out.print(prefix1); |
| 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(prefix2, entry.getValue(), |
| term != null ? term.getWidth() : 80, out); |
| } |
| } |
| } |
| out.println(); |
| } |
| |
| 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; |
| } |
| |
| } |