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establish maven archetype that creates working discord bot
* maven archetype creates bare minimum working discord bot * Create README.md * Update formatting of some files ---------
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‎README.md

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Command to generate project:
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mvn archetype:generate -DarchetypeGroupId=org.mneidinger.maven.archetype -DarchetypeArtifactId=Archetype-Discord-Bot -DarchetypeVersion=0.0.1-SNAPSHOT -DgroupId=org.mneidinger.discordbot -DartifactId=DiscordPollBot -Dversion=1.0.0-SNAPSHOT -Dgoals=compiler:compile

‎pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.mneidinger.maven.archetype</groupId>
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<artifactId>Archetype-Discord-Bot</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>maven-archetype</packaging>
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<build>
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<extensions>
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<extension>
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<groupId>org.apache.maven.archetype</groupId>
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<artifactId>archetype-packaging</artifactId>
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<version>3.1.1</version>
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</extension>
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</extensions>
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</build>
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</project>

‎src/main/resources/META-INF/maven/archetype-metadata.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<archetype-descriptor
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xmlns="https://maven.apache.org/plugins/maven-archetype-plugin/archetype-descriptor/1.1.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="https://maven.apache.org/plugins/maven-archetype-plugin/archetype-descriptor/1.1.0 https://maven.apache.org/xsd/archetype-descriptor-1.1.0.xsd"
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name="quickstart">
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<fileSets>
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<fileSet filtered="true" packaged="true">
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<directory>src/main/java</directory>
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<includes>
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<include>**/*.java</include>
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</includes>
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</fileSet>
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<fileSet>
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<directory>src/main/resources</directory>
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</fileSet>
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<fileSet>
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<directory>src/test/java</directory>
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</fileSet>
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<fileSet>
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<directory>src/test/resources</directory>
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</fileSet>
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</fileSets>
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<requiredProperties>
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<requiredProperty key="discord4jVersion">
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<defaultValue>3.3.0-RC1</defaultValue>
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</requiredProperty>
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<requiredProperty key="springBootStarterVersion">
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<defaultValue>3.4.2</defaultValue>
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</requiredProperty>
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</requiredProperties>
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</archetype-descriptor>

‎src/main/resources/archetype-resources/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>${groupId}</groupId>
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<artifactId>${artifactId}</artifactId>
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<version>${version}</version>
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<packaging>jar</packaging>
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<name>${artifactId}</name>
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<properties>
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<maven.compiler.release>21</maven.compiler.release>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.discord4j</groupId>
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<artifactId>discord4j-core</artifactId>
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<version>${discord4jVersion}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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<version>${springBootStarterVersion}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-webflux</artifactId>
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<version>${springBootStarterVersion}</version>
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</dependency>
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</dependencies>
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</project>

‎src/main/resources/archetype-resources/src/main/java/BotConfiguration.java

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package ${package};
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import java.util.List;
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import org.mneidinger.discordbot.BotConfiguration;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import discord4j.core.DiscordClientBuilder;
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import discord4j.core.GatewayDiscordClient;
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import discord4j.core.event.domain.Event;
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import ${package}.event.*;
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@Configuration
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public class BotConfiguration {
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private static final Logger log = LoggerFactory.getLogger( BotConfiguration.class );
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@Value("${token}")
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private String token;
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@Bean
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<T extends Event> GatewayDiscordClient gatewayDiscordClient(List<EventListener<T>> eventListeners) {
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try {
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GatewayDiscordClient client = DiscordClientBuilder.create(token)
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.build()
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.login()
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.block();
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for(EventListener<T> listener : eventListeners) {
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client.on(listener.getEventType())
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.flatMap(listener::execute)
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.onErrorResume(listener::handleError)
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.subscribe();
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}
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return client;
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}catch(Exception e) {
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log.error("Exception!: ", e);
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}
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return null;
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}
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}

‎src/main/resources/archetype-resources/src/main/java/__artifactId__Application.java

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package ${package};
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class ${artifactId}Application {
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public static void main(String[] args) {
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SpringApplication.run(${artifactId}Application.class, args);
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}
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}

‎src/main/resources/archetype-resources/src/main/java/event/EventListener.java

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package ${package}.event;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import discord4j.core.event.domain.Event;
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import reactor.core.publisher.Mono;
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public interface EventListener<T extends Event> {
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Logger LOG = LoggerFactory.getLogger(EventListener.class);
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Class<T> getEventType();
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Mono<Void> execute(T event);
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default Mono<Void> handleError(Throwable error){
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LOG.error("Unable to process " + getEventType().getSimpleName(), error);
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return Mono.empty();
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}
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}

‎src/main/resources/archetype-resources/src/main/java/event/MessageCreateListener.java

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package ${package}.event;
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import org.springframework.stereotype.Service;
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import discord4j.core.event.domain.message.MessageCreateEvent;
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import reactor.core.publisher.Mono;
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@Service
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public class MessageCreateListener extends MessageListener implements EventListener<MessageCreateEvent> {
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@Override
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public Class<MessageCreateEvent> getEventType() {
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return MessageCreateEvent.class;
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}
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@Override
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public Mono<Void> execute(MessageCreateEvent event) {
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return processCommand(event.getMessage());
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}
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}

‎src/main/resources/archetype-resources/src/main/java/event/MessageListener.java

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package ${package}.event;
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import discord4j.core.object.entity.Message;
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import reactor.core.publisher.Mono;
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public abstract class MessageListener {
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public Mono<Void> processCommand(Message eventMessage){
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return Mono.just(eventMessage)
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.filter(message -> message.getAuthor().map(user -> !user.isBot()).orElse(false))
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.filter(message -> message.getContent().equalsIgnoreCase("!todo"))
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.flatMap(Message::getChannel)
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.flatMap(channel -> channel.createMessage("Things to do today:\n - write a bot\n - eat lunch\n - play a game"))
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.then();
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}
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}

‎src/main/resources/archetype-resources/src/main/java/event/MessageUpdateListener.java

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package ${package}.event;
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import org.springframework.stereotype.Service;
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import discord4j.core.event.domain.message.MessageUpdateEvent;
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import reactor.core.publisher.Mono;
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@Service
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public class MessageUpdateListener extends MessageListener implements EventListener<MessageUpdateEvent> {
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@Override
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public Class<MessageUpdateEvent> getEventType() {
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return MessageUpdateEvent.class;
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}
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@Override
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public Mono<Void> execute(MessageUpdateEvent event) {
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return Mono.just(event)
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.filter(MessageUpdateEvent::isContentChanged)
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.flatMap(MessageUpdateEvent::getMessage)
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.flatMap(super::processCommand);
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}
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}

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