Improvements for JDA command prefixes. (#94)

jda/src/main/java/co/aikar/commands/CommandConfig.java

@@ -3,8 +3,10 @@ package co.aikar.commands;
 import net.dv8tion.jda.core.events.message.MessageReceivedEvent;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.List;
+
 public interface CommandConfig extends CommandConfigProvider {
-    @NotNull String getStartsWith();
+    @NotNull List<String> getCommandPrefixes();
 
     @Override
     default CommandConfig provide(MessageReceivedEvent event) {

jda/src/main/java/co/aikar/commands/JDACommandConfig.java

@@ -2,19 +2,18 @@ package co.aikar.commands;
 
 import org.jetbrains.annotations.NotNull;
 
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
 public class JDACommandConfig implements CommandConfig {
-    protected @NotNull String startsWith = "!";
+    protected @NotNull List<String> commandPrefixes = new CopyOnWriteArrayList<>(new String[] {"!"});
 
     public JDACommandConfig() {
 
     }
 
     @NotNull
-    public String getStartsWith() {
-        return startsWith;
-    }
-
-    public void setStartsWith(@NotNull String startsWith) {
-        this.startsWith = startsWith;
+    public List<String> getCommandPrefixes() {
+        return commandPrefixes;
     }
 }

jda/src/main/java/co/aikar/commands/JDACommandManager.java

@@ -226,7 +226,14 @@ public class JDACommandManager extends CommandManager<
             }
         }
 
-        if (!msg.startsWith(config.getStartsWith())) {
+        boolean foundPrefix = false;
+        for (String prefix : config.getCommandPrefixes()) {
+            if (msg.startsWith(prefix)) {
+                foundPrefix = true;
+                break;
+            }
+        }
+        if (!foundPrefix) {
             return;
         }