improve desu

src/passive/fufufu.rs

@@ -1,18 +1,38 @@
-use crate::simple_responder;
+use futures::future::BoxFuture;
 use lazy_static::lazy_static;
 use regex::Regex;
 use serenity::async_trait;
 use serenity::model::channel::Message;
 use serenity::prelude::{Context, EventHandler};
 
-// Yes, the blocks are necessary, rustc is bugged; check macro declaration
-// for more info.
-simple_responder!(FufufuResponder, r"(?:[fF][uU]){3,}", { get_desu() });
+lazy_static! {
+    static ref REGEX: Regex = Regex::new("(?:[fF][uU]){3,}").unwrap();
+}
 
-const DESU_STRINGS: &[&str] = &[
-    "です。",
-    "desu~",
-    "desu.",
+pub(crate) struct FufufuResponder;
+
+#[async_trait]
+impl EventHandler for FufufuResponder {
+    async fn message(&self, ctx: Context, message: Message) {
+        if REGEX.is_match(&message.content_safe(ctx.clone()).await) {
+            use rand::seq::SliceRandom;
+            use rand::thread_rng;
+            let random_action = DESU_ACTIONS.choose(&mut thread_rng()).unwrap().clone();
+            let random_action = random_action(ctx, message);
+            random_action.await.unwrap();
+        }
+    }
+}
+
+type DesuAction<'r, T> = &'r (dyn Fn(Context, Message) -> T + Sync);
+
+const DESU_ACTIONS: &[DesuAction<BoxFuture<Result<Message, serenity::Error>>>] = &[
+    &|ctx, msg| Box::pin(msg.channel_id.say(ctx, "です。")),
+    &|ctx, msg| Box::pin(msg.channel_id.say(ctx, "desu~")),
+    &|ctx, msg| Box::pin(msg.channel_id.say(ctx, "desu.")),
+    &|ctx, msg| {
+        Box::pin(msg.channel_id.say(
+            ctx,
             r#"
 ```
 ででででででででででで　　　　　　すす
@@ -25,16 +45,22 @@ const DESU_STRINGS: &[&str] = &[
 　　　　でで　　　　　　　　　　すす
 　　　　　でで　　　　　　　　すす
 ```"#,
+        ))
+    },
+    &|ctx, msg| {
+        // https://imgur.com/a/yOb5n
+        // One day.
+        Box::pin(
+            msg.channel_id
+                .say(ctx, "https://www.youtube.com/watch?v=60mLvBWOMb4"),
+        )
+    },
+    &|ctx, msg| {
+        Box::pin(msg.channel_id.send_message(ctx, |m| {
+            m.add_file(serenity::http::AttachmentType::Bytes {
+                data: std::borrow::Cow::from(&include_bytes!("../desu.jpg")[..]),
+                filename: "desu.jpg".to_string(),
+            })
+        }))
+    },
 ];
-
-fn get_desu() -> &'static str {
-    use rand::seq::SliceRandom;
-    use rand::thread_rng;
-
-    DESU_STRINGS.choose(&mut thread_rng()).unwrap()
-    // // https://imgur.com/a/yOb5n
-    // messageList.add(channel -> channel.sendMessage(new MessageBuilder()
-    //         .setContent("https://www.youtube.com/watch?v=60mLvBWOMb4").build()));
-    // messageList.add(channel -> channel.sendFile(Desu.class.getResourceAsStream("/desu/desu.jpg"), "desu.jpg"));
-    // messageList.add(channel -> channel.sendMessage("desu~"));
-}