Logback configuration similar in style to SimpleLog format

build.gradle

//...
// Add this to your build.gradle
repositories {
    // Logging
    compileOnly "ch.qos.logback:logback-classic:$logback_version"
}
//...

logback.xml

<!--
  ~ Place this in the following directory and name it "logback.xml"
  ~ For testing, you'll want to have a copy of this and name it "logback-test.xml"
  ~ src
  ~ - main
  ~   - resources
  ~     - logback.xml
  ~ - test
  ~   - resources
  ~     - logback-test.xml
  -->

<!-- author: Kaidan Gustave -->
<configuration>

    <!-- Conversions for logging. -->
    <!-- Make sure to replace the "converterClass" path with the path to the file in your project. -->
    <conversionRule conversionWord="simpleHL"
                    converterClass="path.to.SimpleHL"/>

    <appender name="Simple" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <!-- Pattern -->
            <pattern>
                %nopex[%d{HH:mm:ss}] [%simpleHL(%level)] [%logger{0}]: %simpleHL(%msg%n%ex)
            </pattern>
        </encoder>
    </appender>

    <root level="INFO">
        <appender-ref ref="Simple"/>
    </root>

</configuration>

SimpleHL.java

package path.to; // Make sure to replace this with the path to the file in your project.

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.pattern.color.ForegroundCompositeConverterBase;
import static ch.qos.logback.core.pattern.color.ANSIConstants.*;
import static ch.qos.logback.classic.Level.*;

/**
 * A simple highlighter for console text using logback classic.
 *
 * @author Kaidan Gustave
 */
public class SimpleHL extends ForegroundCompositeConverterBase<ILoggingEvent>
{
    @Override
    protected String getForegroundColorCode(ILoggingEvent event)
    {
        switch(event.getLevel().levelInt)
        {
            case ERROR_INT:
                return BOLD + RED_FG;
            case WARN_INT:
                return RED_FG;
            case INFO_INT:
                return GREEN_FG;
            case DEBUG_INT:
                return YELLOW_FG;
            default:
                return DEFAULT_FG;
        }
    }
}

SimpleHL.kt

package path.to // Make sure to replace this with the path to the file in your project.

import ch.qos.logback.classic.spi.ILoggingEvent
import ch.qos.logback.core.pattern.color.ForegroundCompositeConverterBase

import ch.qos.logback.core.pattern.color.ANSIConstants.*
import ch.qos.logback.classic.Level.*

/**
 * A simple highlighter for console text using logback classic.
 *
 * @author Kaidan Gustave
 */
class SimpleHL : ForegroundCompositeConverterBase<ILoggingEvent>()
{
    override fun getForegroundColorCode(event: ILoggingEvent?) = when (event!!.level.levelInt)
    {
        ERROR_INT -> BOLD + RED_FG
        WARN_INT -> RED_FG
        INFO_INT -> GREEN_FG
        DEBUG_INT -> YELLOW_FG
        else -> DEFAULT_FG
    }
}