/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package jdk.nashorn.tools.jjs;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.ClosedWatchServiceException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.util.List;
import java.util.function.Consumer;
import static java.nio.file.StandardWatchEventKinds.ENTRY_CREATE;
import static java.nio.file.StandardWatchEventKinds.ENTRY_DELETE;
import static java.nio.file.StandardWatchEventKinds.ENTRY_MODIFY;
final class ExternalEditor {
private final Consumer<String> errorHandler;
private final Consumer<String> saveHandler;
private final Console input;
private WatchService watcher;
private Thread watchedThread;
private Path dir;
private Path tmpfile;
ExternalEditor(final Consumer<String> errorHandler, final Consumer<String> saveHandler, final Console input) {
this.errorHandler = errorHandler;
this.saveHandler = saveHandler;
this.input = input;
}
private void edit(final String cmd, final String initialText) {
try {
setupWatch(initialText);
launch(cmd);
} catch (IOException ex) {
errorHandler.accept(ex.getMessage());
}
}
/**
* Creates a WatchService and registers the given directory
*/
private void setupWatch(final String initialText) throws IOException {
this.watcher = FileSystems.getDefault().newWatchService();
this.dir = Files.createTempDirectory("REPL");
this.tmpfile = Files.createTempFile(dir, null, ".js");
Files.write(tmpfile, initialText.getBytes(Charset.forName("UTF-8")));
dir.register(watcher,
ENTRY_CREATE,
ENTRY_DELETE,
ENTRY_MODIFY);
watchedThread = new Thread(() -> {
for (;;) {
WatchKey key;
try {
key = watcher.take();
} catch (final ClosedWatchServiceException ex) {
break;
} catch (final InterruptedException ex) {
continue; // tolerate an intrupt
}
if (!key.pollEvents().isEmpty()) {
if (!input.terminalEditorRunning()) {
saveFile();
}
}
boolean valid = key.reset();
if (!valid) {
errorHandler.accept("Invalid key");
break;
}
}
});
watchedThread.start();
}
private void launch(final String cmd) throws IOException {
ProcessBuilder pb = new ProcessBuilder(cmd, tmpfile.toString());
pb = pb.inheritIO();
try {
input.suspend();
Process process = pb.start();
process.waitFor();
} catch (final IOException ex) {
errorHandler.accept("process IO failure: " + ex.getMessage());
} catch (final InterruptedException ex) {
errorHandler.accept("process interrupt: " + ex.getMessage());
} finally {
try {
watcher.close();
watchedThread.join(); //so that saveFile() is finished.
saveFile();
} catch (InterruptedException ex) {
errorHandler.accept("process interrupt: " + ex.getMessage());
} finally {
input.resume();
}
}
}
private void saveFile() {
List<String> lines;
try {
lines = Files.readAllLines(tmpfile);
} catch (final IOException ex) {
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