| /* |
| * 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.commands; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.OutputStream; |
| import java.lang.reflect.Method; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import jline.Terminal; |
| import org.apache.felix.gogo.commands.Command; |
| import org.apache.felix.gogo.commands.Option; |
| import org.apache.karaf.shell.console.AbstractAction; |
| |
| @Command(scope = "shell", name = "more", description = "File pager.") |
| public class MoreAction extends AbstractAction { |
| |
| @Option(name = "--lines", description = "stop after N lines") |
| int lines; |
| |
| @Override |
| protected Object doExecute() throws Exception { |
| Terminal term = (Terminal) session.get(".jline.terminal"); |
| if (term == null || !isTty(System.out)) { |
| BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); |
| String line; |
| while ((line = reader.readLine()) != null) { |
| System.out.println(line); |
| } |
| return null; |
| } else { |
| boolean echo = term.isEchoEnabled(); |
| term.setEchoEnabled(false); |
| try { |
| if (lines == 0) { |
| lines = term.getHeight(); |
| } |
| LineSplitter reader = new LineSplitter(new BufferedReader(new InputStreamReader(System.in)), term.getWidth()); |
| int count = 0; |
| int c; |
| do { |
| do { |
| String line; |
| if ((line = reader.readLine()) == null) { |
| return null; |
| } |
| System.out.println(line); |
| } while (++count < lines - 2); |
| c = -1; |
| while (c == -1) { |
| System.out.flush(); |
| System.out.print("--More--"); |
| System.out.flush(); |
| c = session.getKeyboard().read(); |
| switch (c) { |
| case 'q': |
| case -1: |
| c = 'q'; |
| break; |
| case '\r': |
| case '\n': |
| case 14: // Down arrow |
| count--; |
| System.out.print("\r \r"); |
| break; |
| case ' ': |
| count = 0; |
| System.out.print("\r \r"); |
| break; |
| case 16: // Up arrow |
| // fall through |
| default: |
| c = -1; |
| System.out.print("\r \r"); |
| break; |
| } |
| if (c == 'q') { |
| break; |
| } |
| } |
| } while (c != 'q'); |
| return null; |
| } finally { |
| term.setEchoEnabled(echo); |
| } |
| } |
| } |
| |
| public static class LineSplitter { |
| |
| private final BufferedReader reader; |
| private final int width; |
| private final List<String> lines = new LinkedList<String>(); |
| |
| public LineSplitter(BufferedReader reader, int width) { |
| this.reader = reader; |
| this.width = width; |
| } |
| |
| public String readLine() throws IOException { |
| if (lines.isEmpty()) { |
| String str = reader.readLine(); |
| if (str == null) { |
| return null; |
| } |
| while (str.length() > width) { |
| lines.add(str.substring(0, width)); |
| str = str.substring(width); |
| } |
| lines.add(str); |
| } |
| return lines.remove(0); |
| } |
| } |
| |
| protected boolean isTty(OutputStream out) { |
| try { |
| Method mth = out.getClass().getDeclaredMethod("getCurrent"); |
| mth.setAccessible(true); |
| Object current = mth.invoke(out); |
| return current == session.getConsole(); |
| } catch (Throwable t) { |
| return false; |
| } |
| } |
| |
| } |