Implemented a better way to parse options for the Quote command

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

build.gradle

@@ -34,6 +34,7 @@ dependencies {
     implementation 'com.discord4j:discord4j-core:3.1.1'
     implementation 'com.github.wtekiela:opensub4j:0.3.0'
     implementation 'org.apache.commons:commons-lang3:3.11'
+    implementation 'commons-cli:commons-cli:1.4'
     implementation 'org.apache.commons:commons-csv:1.8'
     implementation 'ch.qos.logback:logback-classic:1.2.3'
     implementation 'org.postgresql:postgresql:42.2.18.jre7'

src/main/java/xyz/vallat/louis/commands/Command.java

@@ -5,6 +5,7 @@ import discord4j.core.event.domain.message.MessageCreateEvent;
 import discord4j.core.object.reaction.ReactionEmoji;
 import discord4j.core.spec.EmbedCreateSpec;
 import discord4j.rest.util.Color;
+import org.apache.commons.cli.Options;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Mono;
@@ -29,6 +30,7 @@ public abstract class Command {
     protected final String usage;
     protected final int minArgs;
     protected final int maxArgs;
+    protected final Options options;
 
     protected Command(String name, String description, String usage, int minArgs, int maxArgs) {
         this.name = name;
@@ -36,6 +38,7 @@ public abstract class Command {
         this.usage = usage;
         this.minArgs = minArgs;
         this.maxArgs = maxArgs;
+        this.options = new Options();
     }
 
     public static <T> Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor) {
@@ -85,6 +88,13 @@ public abstract class Command {
                 .then();
     }
 
+    protected Mono<Void> parsingError(MessageCreateEvent event) {
+        return event.getMessage().getChannel()
+                .flatMap(channel ->
+                channel.createMessage("An error occurred while parsing your command. Usage: ``" + getUsage() + "``."))
+                .then();
+    }
+
     protected void createEmbedListLang(String arg, EmbedCreateSpec embed, boolean isId) {
         try {
             Movie movie = OMDBClient.getMovie(arg, isId);

src/main/java/xyz/vallat/louis/commands/Quote.java

@@ -2,6 +2,12 @@ package xyz.vallat.louis.commands;
 
 import discord4j.core.event.domain.message.MessageCreateEvent;
 import discord4j.rest.util.Color;
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.DefaultParser;
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.ParseException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Mono;
 import xyz.vallat.louis.database.LanguageManager;
 import xyz.vallat.louis.database.SubtitleLineManager;
@@ -9,19 +15,22 @@ import xyz.vallat.louis.subtitles.dao.FilmQuote;
 import xyz.vallat.louis.subtitles.dao.Lang;
 
 import java.time.Instant;
-import java.util.List;
 
 public class Quote extends Command {
 
+    private static final Logger logger = LoggerFactory.getLogger(Quote.class.getCanonicalName());
 
     public Quote(String name) {
-        super(name, "Get a random quote from any movie.", name + " [lang]", 0, 1);
+        super(name, "Get a random quote from any movie.", name + " [-l|--lang <lang>]", 0, 1);
+        options.addOption(Option.builder("l").longOpt("lang").desc("specify a language").hasArg().build());
     }
 
     @Override
     public Mono<Void> execute(MessageCreateEvent event) {
-        List<String> args = getArguments(event);
+        try {
-        Lang language = LanguageManager.getLangFromAny(args.isEmpty() ? "english" : args.get(0));
+            CommandLine cmd = new DefaultParser().parse(options,
+                    event.getMessage().getContent().substring(name.length()).split(" "));
+            Lang language = LanguageManager.getLangFromAny(cmd.hasOption("l") ? cmd.getOptionValue("l") : "english");
             return event.getMessage().getChannel().flatMap(messageChannel -> messageChannel.createEmbed(embed -> {
                 embed.setTitle("Quote").setColor(Color.RED);
                 if (language == null)
@@ -41,5 +50,9 @@ public class Quote extends Command {
                 }
                 embed.setTimestamp(Instant.now());
             })).then();
+        } catch (ParseException e) {
+            logger.error("Parsing error: {}", e.getMessage());
+            return parsingError(event);
+        }
     }
 }

src/main/java/xyz/vallat/louis/database/LanguageManager.java

@@ -5,6 +5,7 @@ import org.apache.commons.csv.CSVParser;
 import org.apache.commons.csv.CSVRecord;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import reactor.util.annotation.NonNull;
 import xyz.vallat.louis.codes.ExitCodes;
 import xyz.vallat.louis.subtitles.dao.Lang;
 
@@ -103,7 +104,7 @@ public final class LanguageManager {
         }
     }
 
-    public static Lang getLangFromAny(String name) {
+    public static Lang getLangFromAny(@NonNull String name) {
         Lang lang = null;
         name = name.toLowerCase();
         try (Connection connection = DBManager.getConnection()) {