https://ant.apache.org/: master POM (The Apache Software Foundation) 
/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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
 *
 *      https://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.apache.tools.ant.listener;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Properties;

import org.apache.tools.ant.DefaultLogger;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.util.FileUtils;


Uses ANSI Color Code Sequences to colorize messages
sent to the console.

If used with the -logfile option, the output file
will contain all the necessary escape codes to
display the text in colorized mode when displayed
in the console using applications like cat, more,
etc.


This is designed to work on terminals that support ANSI
color codes.  It works on XTerm, ETerm, Mindterm, etc.
It also works on Win9x (with ANSI.SYS loaded.)


NOTE:
It doesn't work on WinNT's COMMAND.COM even with
ANSI.SYS loaded.


The default colors used for differentiating
the message levels can be changed by editing the
/org/apache/tools/ant/listener/defaults.properties
file.
This file contains 5 key/value pairs:


AnsiColorLogger.ERROR_COLOR=2;31
AnsiColorLogger.WARNING_COLOR=2;35
AnsiColorLogger.INFO_COLOR=2;36
AnsiColorLogger.VERBOSE_COLOR=2;32
AnsiColorLogger.DEBUG_COLOR=2;34



Another option is to pass a system variable named
ant.logger.defaults, with value set to the path of
the file that contains user defined Ansi Color
Codes, to the java command using -D option.

To change these colors use the following chart:
     
ANSI COLOR LOGGER CONFIGURATION

Format for AnsiColorLogger.*=
 Attribute;Foreground;Background
 Attribute is one of the following: 
 0 -> Reset All Attributes (return to normal mode)
 1 -> Bright (Usually turns on BOLD)
 2 -> Dim
 3 -> Underline
 5 -> link
 7 -> Reverse
 8 -> Hidden
 

 Foreground is one of the following:
 30 -> Black
 31 -> Red
 32 -> Green
 33 -> Yellow
 34 -> Blue
 35 -> Magenta
 36 -> Cyan
 37 -> White
 

 Background is one of the following:
 40 -> Black
 41 -> Red
 42 -> Green
 43 -> Yellow
 44 -> Blue
 45 -> Magenta
 46 -> Cyan
 47 -> White
 


/**
 * Uses ANSI Color Code Sequences to colorize messages
 * sent to the console.
 *
 * <p>If used with the -logfile option, the output file
 * will contain all the necessary escape codes to
 * display the text in colorized mode when displayed
 * in the console using applications like cat, more,
 * etc.</p>
 *
 * <p>This is designed to work on terminals that support ANSI
 * color codes.  It works on XTerm, ETerm, Mindterm, etc.
 * It also works on Win9x (with ANSI.SYS loaded.)</p>
 *
 * <p>NOTE:
 * It doesn't work on WinNT's COMMAND.COM even with
 * ANSI.SYS loaded.</p>
 *
 * <p>The default colors used for differentiating
 * the message levels can be changed by editing the
 * /org/apache/tools/ant/listener/defaults.properties
 * file.
 * This file contains 5 key/value pairs:</p>
 * <pre>
 * AnsiColorLogger.ERROR_COLOR=2;31
 * AnsiColorLogger.WARNING_COLOR=2;35
 * AnsiColorLogger.INFO_COLOR=2;36
 * AnsiColorLogger.VERBOSE_COLOR=2;32
 * AnsiColorLogger.DEBUG_COLOR=2;34
 * </pre>
 *
 * <p>Another option is to pass a system variable named
 * ant.logger.defaults, with value set to the path of
 * the file that contains user defined Ansi Color
 * Codes, to the <B>java</B> command using -D option.</p>
 *
 * To change these colors use the following chart:
 *
 *      <h2>ANSI COLOR LOGGER CONFIGURATION</h2>
 *
 * Format for AnsiColorLogger.*=
 *  Attribute;Foreground;Background
 *
 *  Attribute is one of the following: <pre>
 *  0 -&gt; Reset All Attributes (return to normal mode)
 *  1 -&gt; Bright (Usually turns on BOLD)
 *  2 -&gt; Dim
 *  3 -&gt; Underline
 *  5 -&gt; link
 *  7 -&gt; Reverse
 *  8 -&gt; Hidden
 *  </pre>
 *
 *  Foreground is one of the following:<pre>
 *  30 -&gt; Black
 *  31 -&gt; Red
 *  32 -&gt; Green
 *  33 -&gt; Yellow
 *  34 -&gt; Blue
 *  35 -&gt; Magenta
 *  36 -&gt; Cyan
 *  37 -&gt; White
 *  </pre>
 *
 *  Background is one of the following:<pre>
 *  40 -&gt; Black
 *  41 -&gt; Red
 *  42 -&gt; Green
 *  43 -&gt; Yellow
 *  44 -&gt; Blue
 *  45 -&gt; Magenta
 *  46 -&gt; Cyan
 *  47 -&gt; White
 *  </pre>
 */
public class AnsiColorLogger extends DefaultLogger {
    // private static final int ATTR_NORMAL = 0;
    // private static final int ATTR_BRIGHT = 1;
    private static final int ATTR_DIM = 2;
    // private static final int ATTR_UNDERLINE = 3;
    // private static final int ATTR_BLINK = 5;
    // private static final int ATTR_REVERSE = 7;
    // private static final int ATTR_HIDDEN = 8;

    // private static final int FG_BLACK = 30;
    private static final int FG_RED = 31;
    private static final int FG_GREEN = 32;
    // private static final int FG_YELLOW = 33;
    private static final int FG_BLUE = 34;
    private static final int FG_MAGENTA = 35;
    private static final int FG_CYAN = 36;
    // private static final int FG_WHITE = 37;

    // private static final int BG_BLACK = 40;
    // private static final int BG_RED = 41;
    // private static final int BG_GREEN = 42;
    // private static final int BG_YELLOW = 44;
    // private static final int BG_BLUE = 44;
    // private static final int BG_MAGENTA = 45;
    // private static final int BG_CYAN = 46;
    // private static final int BG_WHITE = 47;

    private static final String PREFIX = "\u001b[";
    private static final String SUFFIX = "m";
    private static final char SEPARATOR = ';';
    private static final String END_COLOR = PREFIX + SUFFIX;

    private String errColor
        = PREFIX + ATTR_DIM + SEPARATOR + FG_RED + SUFFIX;
    private String warnColor
        = PREFIX + ATTR_DIM + SEPARATOR + FG_MAGENTA + SUFFIX;
    private String infoColor
        = PREFIX + ATTR_DIM + SEPARATOR + FG_CYAN + SUFFIX;
    private String verboseColor
        = PREFIX + ATTR_DIM + SEPARATOR + FG_GREEN + SUFFIX;
    private String debugColor
        = PREFIX + ATTR_DIM + SEPARATOR + FG_BLUE + SUFFIX;

    private boolean colorsSet = false;

    
Set the colors to use from a property file specified by the
special ant property ant.logger.defaults

/**
     * Set the colors to use from a property file specified by the
     * special ant property ant.logger.defaults
     */
    private void setColors() {
        String userColorFile = System.getProperty("ant.logger.defaults");
        String systemColorFile =
            "/org/apache/tools/ant/listener/defaults.properties";

        InputStream in = null;

        try {
            Properties prop = new Properties();

            if (userColorFile != null) {
                in = Files.newInputStream(Paths.get(userColorFile));
            } else {
                in = getClass().getResourceAsStream(systemColorFile);
            }

            if (in != null) {
                prop.load(in);
            }

            String errC = prop.getProperty("AnsiColorLogger.ERROR_COLOR");
            String warn = prop.getProperty("AnsiColorLogger.WARNING_COLOR");
            String info = prop.getProperty("AnsiColorLogger.INFO_COLOR");
            String verbose = prop.getProperty("AnsiColorLogger.VERBOSE_COLOR");
            String debug = prop.getProperty("AnsiColorLogger.DEBUG_COLOR");
            if (errC != null) {
                errColor = PREFIX + errC + SUFFIX;
            }
            if (warn != null) {
                warnColor = PREFIX + warn + SUFFIX;
            }
            if (info != null) {
                infoColor = PREFIX + info + SUFFIX;
            }
            if (verbose != null) {
                verboseColor = PREFIX + verbose + SUFFIX;
            }
            if (debug != null) {
                debugColor = PREFIX + debug + SUFFIX;
            }
        } catch (IOException ioe) {
            //Ignore - we will use the defaults.
        } finally {
            FileUtils.close(in);
        }
    }

    
See Also:
  • 
{@inheritDoc}.
/**
     * @see DefaultLogger#printMessage
     * {@inheritDoc}.
     */
    @Override
    protected void printMessage(final String message,
                                final PrintStream stream,
                                final int priority) {
        if (message != null && stream != null) {
            if (!colorsSet) {
                setColors();
                colorsSet = true;
            }

            final StringBuilder msg = new StringBuilder(message);
            switch (priority) {
                case Project.MSG_ERR:
                    msg.insert(0, errColor);
                    msg.append(END_COLOR);
                    break;
                case Project.MSG_WARN:
                    msg.insert(0, warnColor);
                    msg.append(END_COLOR);
                    break;
                case Project.MSG_INFO:
                    msg.insert(0, infoColor);
                    msg.append(END_COLOR);
                    break;
                case Project.MSG_VERBOSE:
                    msg.insert(0, verboseColor);
                    msg.append(END_COLOR);
                    break;
                case Project.MSG_DEBUG:
                    // Fall through
                default:
                    msg.insert(0, debugColor);
                    msg.append(END_COLOR);
                    break;
            }
            final String strmessage = msg.toString();
            stream.println(strmessage);
        }
    }
}