Move clearchat command to base class

The "clear" command now supports both slash commands and message commands, having identical behavior in both situations.

src/main/java/wtf/beatrice/hidekobot/commands/message/ClearCommand.java

@@ -0,0 +1,79 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import net.dv8tion.jda.api.interactions.components.buttons.Button;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.commands.base.ClearChat;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+public class ClearCommand implements MessageCommand
+{
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return new LinkedList<>(Collections.singletonList(ClearChat.getLabel()));
+    }
+
+    @Override
+    public List<Permission> getPermissions() { return Collections.singletonList(ClearChat.getPermission()); }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+        // start a new thread, because we are doing synchronous, thread-blocking operations!
+        new Thread(() ->
+        {
+            String senderId = event.getMessage().getAuthor().getId();
+
+            // check if user is trying to run command in dms.
+            String error = ClearChat.checkDMs(event.getChannel());
+            if (error != null) {
+                event.getMessage().reply(error).queue();
+                return;
+            }
+
+            // get the amount from the command args.
+            Integer toDeleteAmount;
+            if (args.length == 0) toDeleteAmount = 1;
+            else toDeleteAmount = Integer.parseInt(args[0]);
+
+            error = ClearChat.checkDeleteAmount(toDeleteAmount);
+            if (error != null) {
+                event.getMessage().reply(error).queue();
+                return;
+            }
+
+            // answer by saying that the operation has begun.
+            String content = "\uD83D\uDEA7 Clearing...";
+            Message botMessage = event.getMessage().reply(content).complete();
+
+            int deleted = ClearChat.delete(toDeleteAmount,
+                    event.getMessageIdLong(),
+                    event.getChannel());
+
+            // get a nicely formatted message that logs the deletion of messages.
+            content = ClearChat.parseAmount(deleted);
+
+            // edit the message text and attach a button.
+            Button dismiss = ClearChat.getDismissButton();
+            botMessage = botMessage.editMessage(content).setActionRow(dismiss).complete();
+
+            // add the message to database.
+            Cache.getDatabaseSource().queueDisabling(botMessage);
+            Cache.getDatabaseSource().trackRanCommandReply(botMessage, event.getAuthor());
+        }).start();
+
+    }
+
+}