Add /discord command to display invite code (#4620)

Essentials/src/main/resources/messages.properties

@@ -240,6 +240,11 @@ discordbroadcastCommandUsage1Description=Sends the given message to the specifie
 discordbroadcastInvalidChannel=\u00a74Discord channel \u00a7c{0}\u00a74 does not exist.
 discordbroadcastPermission=\u00a74You do not have permission to send messages to the \u00a7c{0}\u00a74 channel.
 discordbroadcastSent=\u00a76Message sent to \u00a7c{0}\u00a76!
+discordCommandDescription=Sends the discord invite link to the player.
+discordCommandLink=\u00a76Join our Discord server at \u00a7c{0}\u00a76!
+discordCommandUsage=/<command>
+discordCommandUsage1=/<command>
+discordCommandUsage1Description=Sends the discord invite link to the player
 discordCommandExecuteDescription=Executes a console command on the Minecraft server.
 discordCommandExecuteArgumentCommand=The command to be executed
 discordCommandExecuteReply=Executing command: "/{0}"

EssentialsDiscord/src/main/java/net/essentialsx/discord/DiscordSettings.java

@@ -59,6 +59,10 @@ public class DiscordSettings implements IConf {
         return config.getLong("guild", 0);
     }
 
+    public String getDiscordUrl() {
+        return config.getString("discord-url", "https://discord.gg/invite-code");
+    }
+
     public long getPrimaryChannelId() {
         return config.getLong("channels.primary", 0);
     }

EssentialsDiscord/src/main/java/net/essentialsx/discord/commands/Commanddiscord.java

@@ -0,0 +1,19 @@
+package net.essentialsx.discord.commands;
+
+import com.earth2me.essentials.CommandSource;
+import com.earth2me.essentials.commands.EssentialsCommand;
+import net.essentialsx.discord.JDADiscordService;
+import org.bukkit.Server;
+
+import static com.earth2me.essentials.I18n.tl;
+
+public class Commanddiscord extends EssentialsCommand {
+    public Commanddiscord() {
+        super("discord");
+    }
+
+    @Override
+    protected void run(Server server, CommandSource sender, String commandLabel, String[] args) {
+        sender.sendMessage(tl("discordCommandLink", ((JDADiscordService) module).getSettings().getDiscordUrl()));
+    }
+}

EssentialsDiscord/src/main/resources/config.yml

@@ -17,6 +17,9 @@ token: "INSERT-TOKEN-HERE"
 # The ID of your server.
 guild: 000000000000000000
 
+# The Discord invite URL that will be shown when a player when using the /discord command or in other areas.
+discord-url: "https://discord.gg/invite-code"
+
 # Defined text channels
 # =====================
 # 

EssentialsDiscord/src/main/resources/plugin.yml

@@ -13,3 +13,7 @@ commands:
     description: Broadcasts a message to the specified Discord channel.
     usage: /<command> <channel> <msg>
     aliases: [dbroadcast, dbc, dbcast, ediscordbroadcast, edbroadcast, edbc, edbcast]
+  discord:
+    description: Sends the discord invite link to the player.
+    usage: /<command>
+    aliases: [ediscord]