/**
 * Copyright (C) 2009, Progress Software Corporation and/or its 
 * subsidiaries or affiliates.  All rights reserved.
 *
 * Licensed 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.fusesource.jansi;

import static org.fusesource.jansi.internal.CLibrary.STDERR_FILENO;
import static org.fusesource.jansi.internal.CLibrary.STDOUT_FILENO;
import static org.fusesource.jansi.internal.CLibrary.isatty;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

/**
 * Provides consistent access to an ANSI aware console PrintStream.
 *
 * @author <a href="http://hiramchirino.com">Hiram Chirino</a>
 * @since 1.0
 */
public class AnsiConsole {

    public static final PrintStream system_out = System.out;
    public static final PrintStream out = new PrintStream( wrapOutputStream( system_out ) );

    public static final PrintStream system_err = System.err;
    public static final PrintStream err = new PrintStream( wrapOutputStream( system_err, STDERR_FILENO ) );

    private static int installed;

    private AnsiConsole() {
    }

    public static OutputStream wrapOutputStream(final OutputStream stream) {
        return wrapOutputStream(stream, STDOUT_FILENO);
    }

    public static OutputStream wrapOutputStream(final OutputStream stream, int fileno) {

        // If the jansi.passthrough property is set, then don't interpret
        // any of the ansi sequences.
        if (Boolean.getBoolean("jansi.passthrough")) {
            return stream;
        }

        // If the jansi.strip property is set, then we just strip the
        // the ansi escapes.
        if (Boolean.getBoolean("jansi.strip")) {
            return new AnsiOutputStream(stream);
        }

        String os = System.getProperty("os.name");
        if (os.startsWith("Windows") && !isXterm()) {

            // On windows we know the console does not interpret ANSI codes..
            try {
                return new WindowsAnsiOutputStream(stream);
            } catch (Throwable ignore) {
                // this happens when JNA is not in the path.. or
                // this happens when the stdout is being redirected to a file.
            }

            // Use the ANSIOutputStream to strip out the ANSI escape sequences.
            return new AnsiOutputStream(stream);
        }

        // We must be on some Unix variant, including Cygwin or MSYS(2) on Windows...
        try {
            // If the jansi.force property is set, then we force to output
            // the ansi escapes for piping it into ansi color aware commands (e.g. less -r)
            boolean forceColored = Boolean.getBoolean("jansi.force");
            // If we can detect that stdout is not a tty.. then setup
            // to strip the ANSI sequences..
            if (!isXterm() && !forceColored && isatty(fileno) == 0) {
                return new AnsiOutputStream(stream);
            }
        } catch (Throwable ignore) {
            // These errors happen if the JNI lib is not available for your platform.
            // But since we are on ANSI friendly platform, assume the user is on the console.
        }

        // By default we assume your Unix tty can handle ANSI codes.
        // Just wrap it up so that when we get closed, we reset the
        // attributes.
        return new FilterOutputStream(stream) {
            @Override
            public void close() throws IOException {
                write(AnsiOutputStream.REST_CODE);
                flush();
                super.close();
            }
        };
    }

    private static boolean isXterm() {
        return "xterm".equals(System.getenv("TERM"));
    }

    /**
     * If the standard out natively supports ANSI escape codes, then this just
     * returns System.out, otherwise it will provide an ANSI aware PrintStream
     * which strips out the ANSI escape sequences or which implement the escape
     * sequences.
     *
     * @return a PrintStream which is ANSI aware.
     */
    public static PrintStream out() {
        return out;
    }

    /**
     * If the standard out natively supports ANSI escape codes, then this just
     * returns System.err, otherwise it will provide an ANSI aware PrintStream
     * which strips out the ANSI escape sequences or which implement the escape
     * sequences.
     *
     * @return a PrintStream which is ANSI aware.
     */
    public static PrintStream err() {
        return err;
    }

    /**
     * Install Console.out to System.out.
     */
    synchronized static public void systemInstall() {
        installed++;
        if (installed == 1) {
            System.setOut(out);
            System.setErr(err);
        }
    }

    /**
     * undo a previous {@link #systemInstall()}.  If {@link #systemInstall()} was called
     * multiple times, it {@link #systemUninstall()} must call the same number of times before
     * it is actually uninstalled.
     */
    synchronized public static void systemUninstall() {
        installed--;
        if (installed == 0) {
            System.setOut(system_out);
            System.setErr(system_err);
        }
    }

}

@@ -1483,32 +1483,37 @@
 rintStream( wrap
+Error
 OutputStream( sy
@@ -1524,23 +1524,8 @@
 _err
-, STDERR_FILENO
  ) )
@@ -1666,32 +1666,50 @@
 tream stream) %7B%0A
+        try %7B%0A    
         return w
@@ -1748,16 +1748,369 @@
 ILENO);%0A
+        %7D catch (Throwable ignore) %7B%0A            return wrapOutputStream(stream, 0);%0A        %7D%0A    %7D%0A%0A    public static OutputStream wrapErrorOutputStream(final OutputStream stream) %7B%0A        try %7B%0A            return wrapOutputStream(stream, STDERR_FILENO);%0A        %7D catch (Throwable ignore) %7B%0A            return wrapOutputStream(stream, 0);%0A        %7D%0A
     %7D%0A%0A 

Deal with UnsatisfiedLinkError: when native lib can't be loaded, jansi can deal with this case.