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/*
* Copyright (c) 2002-2007, Marc Prud'hommeaux. All rights reserved.
*
* This software is distributable under the BSD license. See the terms of the
* BSD license in the documentation provided with this software.
*/
package jline.internal;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.MessageFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Provides access to terminal line settings via <tt>stty</tt>.
*
* @author <a href="mailto:mwp1@cornell.edu">Marc Prud'hommeaux</a>
* @author <a href="mailto:dwkemp@gmail.com">Dale Kemp</a>
* @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
* @author <a href="mailto:jbonofre@apache.org">Jean-Baptiste Onofré</a>
* @since 2.0
*/
public final class TerminalLineSettings
{
public static final String JLINE_STTY = "jline.stty";
public static final String DEFAULT_STTY = "stty";
public static final String JLINE_SH = "jline.sh";
public static final String DEFAULT_SH = "sh";
private String sttyCommand;
private String shCommand;
private String config;
private long configLastFetched;
public TerminalLineSettings() throws IOException, InterruptedException {
sttyCommand = Configuration.getString(JLINE_STTY, DEFAULT_STTY);
shCommand = Configuration.getString(JLINE_SH, DEFAULT_SH);
config = get("-a");
configLastFetched = System.currentTimeMillis();
Log.debug("Config: ", config);
// sanity check
if (config.length() == 0) {
throw new IOException(MessageFormat.format("Unrecognized stty code: {0}", config));
}
}
public String getConfig() {
return config;
}
public void restore() throws IOException, InterruptedException {
set("sane");
}
public String get(final String args) throws IOException, InterruptedException {
return stty(args);
}
public void set(final String args) throws IOException, InterruptedException {
stty(args);
}
/**
* <p>
* Get the value of a stty property, including the management of a cache.
* </p>
*
* @param name the stty property.
* @return the stty property value.
*/
public int getProperty(String name) {
assert name != null;
// CraftBukkit start
long currentTime = System.currentTimeMillis();
try {
// tty properties are cached so we don't have to worry too much about getting term widht/height
if (config == null || currentTime - configLastFetched > 1000) {
config = get("-a");
}
} catch (Exception e) {
Log.debug("Failed to query stty ", name, "\n", e);
}
// always update the last fetched time and try to parse the output
if (currentTime - configLastFetched > 1000) {
configLastFetched = currentTime;
}
return this.getProperty(name, config);
// CraftBukkit end
}
/**
* <p>
* Parses a stty output (provided by stty -a) and return the value of a given property.
* </p>
*
* @param name property name.
* @param stty string resulting of stty -a execution.
* @return value of the given property.
*/
protected static int getProperty(String name, String stty) {
// try the first kind of regex
Pattern pattern = Pattern.compile(name + "\\s+=\\s+([^;]*)[;\\n\\r]");
Matcher matcher = pattern.matcher(stty);
if (!matcher.find()) {
// try a second kind of regex
pattern = Pattern.compile(name + "\\s+([^;]*)[;\\n\\r]");
matcher = pattern.matcher(stty);
if (!matcher.find()) {
// try a second try of regex
pattern = Pattern.compile("(\\S*)\\s+" + name);
matcher = pattern.matcher(stty);
if (!matcher.find()) {
return -1;
}
}
}
return parseControlChar(matcher.group(1));
}
private static int parseControlChar(String str) {
// under
if ("<undef>".equals(str)) {
return -1;
}
// octal
if (str.charAt(0) == '0') {
return Integer.parseInt(str, 8);
}
// decimal
if (str.charAt(0) >= '1' && str.charAt(0) <= '9') {
return Integer.parseInt(str, 10);
}
// control char
if (str.charAt(0) == '^') {
if (str.charAt(1) == '?') {
return 127;
} else {
return str.charAt(1) - 64;
}
} else if (str.charAt(0) == 'M' && str.charAt(1) == '-') {
if (str.charAt(2) == '^') {
if (str.charAt(3) == '?') {
return 127 + 128;
} else {
return str.charAt(3) - 64 + 128;
}
} else {
return str.charAt(2) + 128;
}
} else {
return str.charAt(0);
}
}
private String stty(final String args) throws IOException, InterruptedException {
assert args != null;
return exec(String.format("%s %s < /dev/tty", sttyCommand, args));
}
private String exec(final String cmd) throws IOException, InterruptedException {
assert cmd != null;
return exec(shCommand, "-c", cmd);
}
private String exec(final String... cmd) throws IOException, InterruptedException {
assert cmd != null;
ByteArrayOutputStream bout = new ByteArrayOutputStream();
Log.trace("Running: ", cmd);
Process p = Runtime.getRuntime().exec(cmd);
InputStream in = null;
InputStream err = null;
OutputStream out = null;
try {
int c;
in = p.getInputStream();
while ((c = in.read()) != -1) {
bout.write(c);
}
err = p.getErrorStream();
while ((c = err.read()) != -1) {
bout.write(c);
}
out = p.getOutputStream();
p.waitFor();
}
finally {
close(in, out, err);
}
String result = bout.toString();
Log.trace("Result: ", result);
return result;
}
private static void close(final Closeable... closeables) {
for (Closeable c : closeables) {
try {
c.close();
}
catch (Exception e) {
// Ignore
}
}
}
}
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