1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.tools.jjs;
  27 
  28 import java.io.File;
  29 import java.io.IOException;
  30 import java.io.InputStream;
  31 import java.io.PrintStream;
  32 import java.util.ArrayList;
  33 import java.util.Arrays;
  34 import java.util.Collections;
  35 import java.util.Iterator;
  36 import java.util.List;
  37 import jdk.internal.jline.NoInterruptUnixTerminal;
  38 import jdk.internal.jline.Terminal;
  39 import jdk.internal.jline.TerminalFactory;
  40 import jdk.internal.jline.TerminalFactory.Flavor;
  41 import jdk.internal.jline.WindowsTerminal;
  42 import jdk.internal.jline.console.ConsoleReader;
  43 import jdk.internal.jline.console.completer.Completer;
  44 import jdk.internal.jline.console.history.FileHistory;
  45 
  46 class Console implements AutoCloseable {
  47     private final ConsoleReader in;
  48     private final FileHistory history;
  49 
  50     Console(final InputStream cmdin, final PrintStream cmdout, final File historyFile,
  51             final Completer completer) throws IOException {
  52         TerminalFactory.registerFlavor(Flavor.WINDOWS, isCygwin()? JJSUnixTerminal::new : JJSWindowsTerminal::new);
  53         TerminalFactory.registerFlavor(Flavor.UNIX, JJSUnixTerminal::new);
  54         in = new ConsoleReader(cmdin, cmdout);
  55         in.setExpandEvents(false);
  56         in.setHandleUserInterrupt(true);
  57         in.setBellEnabled(true);
  58         in.setHistory(history = new FileHistory(historyFile));
  59         in.addCompleter(completer);
  60         Runtime.getRuntime().addShutdownHook(new Thread((Runnable)this::saveHistory));
  61     }
  62 
  63     String readLine(final String prompt) throws IOException {
  64         return in.readLine(prompt);
  65     }
  66 
  67     @Override
  68     public void close() {
  69         saveHistory();
  70     }
  71 
  72     private void saveHistory() {
  73         try {
  74             getHistory().flush();
  75         } catch (final IOException exp) {}
  76     }
  77 
  78     FileHistory getHistory() {
  79         return (FileHistory) in.getHistory();
  80     }
  81 
  82     boolean terminalEditorRunning() {
  83         Terminal terminal = in.getTerminal();
  84         if (terminal instanceof JJSUnixTerminal) {
  85             return ((JJSUnixTerminal) terminal).isRaw();
  86         }
  87         return false;
  88     }
  89 
  90     void suspend() {
  91         try {
  92             in.getTerminal().restore();
  93         } catch (Exception ex) {
  94             throw new IllegalStateException(ex);
  95         }
  96     }
  97 
  98     void resume() {
  99         try {
 100             in.getTerminal().init();
 101         } catch (Exception ex) {
 102             throw new IllegalStateException(ex);
 103         }
 104     }
 105 
 106     static final class JJSUnixTerminal extends NoInterruptUnixTerminal {
 107         JJSUnixTerminal() throws Exception {
 108         }
 109 
 110         boolean isRaw() {
 111             try {
 112                 return getSettings().get("-a").contains("-icanon");
 113             } catch (IOException | InterruptedException ex) {
 114                 return false;
 115             }
 116         }
 117 
 118         @Override
 119         public void disableInterruptCharacter() {
 120         }
 121 
 122         @Override
 123         public void enableInterruptCharacter() {
 124         }
 125     }
 126 
 127     static final class JJSWindowsTerminal extends WindowsTerminal {
 128         public JJSWindowsTerminal() throws Exception {
 129         }
 130 
 131         @Override
 132         public void init() throws Exception {
 133             super.init();
 134             setAnsiSupported(false);
 135         }
 136     }
 137 
 138     private static boolean isCygwin() {
 139         return System.getenv("SHELL") != null;
 140     }
 141 }