Refactor message handling by creating dedicated handlers for rule34 and yandere plugins, and add default string utility function

src/plugins/rule34/messages.ts

@@ -0,0 +1,44 @@
+import { Bot, Message } from "npm:discordeno@18.0.1";
+import { drop5, r34test, refresh } from "./api.ts";
+import { logMessage } from "@root/logging.ts";
+import { defaultString } from "@root/defaultString.ts";
+
+export async function rule34MessageHandler(bot: Bot, message: Message) {
+  const command = message.content.split(" ").slice(1).join(" ");
+  switch (command) {
+    case `drop`:
+      logMessage(message);
+      if (
+        message.channelId === 754338073101205524n ||
+        message.guildId === undefined
+      ) {
+        bot.helpers.sendMessage(message.channelId, {
+          content: defaultString(await r34test()),
+        });
+      }
+      break;
+    case `drop5`:
+      logMessage(message);
+      if (
+        message.channelId === 754338073101205524n ||
+        message.guildId === undefined
+      ) {
+        bot.helpers.sendMessage(message.channelId, {
+          content: defaultString(await drop5()),
+        });
+      }
+      break;
+    case `refresh`:
+      logMessage(message);
+      if (
+        message.channelId === 754338073101205524n ||
+        message.guildId === undefined
+      ) {
+        await refresh();
+        bot.helpers.sendMessage(message.channelId, {
+          content: "Refreshed",
+        });
+      }
+      break;
+  }
+}