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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 scala.tools.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 stty.
 *
 * @author Marc Prud'hommeaux
 * @author Dale Kemp
 * @author Jason Dillon
 * @author Jean-Baptiste Onofré
 * @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 static String sttyCommand = Configuration.getString(JLINE_STTY, DEFAULT_STTY);

    private static String shCommand = Configuration.getString(JLINE_SH, DEFAULT_SH);

    private String config;

    private long configLastFetched;

    public TerminalLineSettings() throws IOException, InterruptedException {
        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);
    }

    /**
     * 

* Get the value of a stty property, including the management of a cache. *

* * @param name the stty property. * @return the stty property value. */ public int getProperty(String name) { assert name != null; try { // tty properties are cached so we don't have to worry too much about getting term widht/height if (config == null || System.currentTimeMillis() - configLastFetched > 1000 ) { config = get("-a"); configLastFetched = System.currentTimeMillis(); } return this.getProperty(name, config); } catch (Exception e) { Log.warn("Failed to query stty ", name, e); return -1; } } /** *

* Parses a stty output (provided by stty -a) and return the value of a given property. *

* * @param name property name. * @param stty string resulting of stty -a execution. * @return value of the given property. */ protected 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 int parseControlChar(String str) { // under if ("".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 static String stty(final String args) throws IOException, InterruptedException { assert args != null; return exec(String.format("%s %s < /dev/tty", sttyCommand, args)); } private static String exec(final String cmd) throws IOException, InterruptedException { assert cmd != null; return exec(shCommand, "-c", cmd); } private static 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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