BotServ: COPY <#src> <#dst> to clone bot config

Copies a channel's kickers, badword list, greet and nobot settings onto
another channel (founder-or-admin on both). Cheap because the config is a
typed KickerSettings + Vec<String>, not a bag of stringly extensibles.

src/engine/db.rs

@@ -1539,6 +1539,25 @@ impl Db {
         None
     }
 
+    /// Copy one channel's BotServ configuration — kickers, badwords, greet and
+    /// nobot — onto another. Both channels must be registered.
+    pub fn copy_bot_config(&mut self, src: &str, dst: &str) -> Result<(), ChanError> {
+        let (kickers, badwords, bot_greet, nobot) = {
+            let s = self.channels.get(&key(src)).ok_or(ChanError::NoChannel)?;
+            (s.kickers.clone(), s.badwords.clone(), s.settings.bot_greet, s.settings.nobot)
+        };
+        let dk = key(dst);
+        if !self.channels.contains_key(&dk) {
+            return Err(ChanError::NoChannel);
+        }
+        self.log.append(Event::ChannelKickerSet { channel: dst.to_string(), kickers: kickers.clone() }).map_err(|_| ChanError::Internal)?;
+        self.channels.get_mut(&dk).unwrap().kickers = kickers;
+        self.write_badwords(dst, &dk, badwords)?;
+        self.set_channel_setting(dst, ChanSetting::BotGreet, bot_greet)?;
+        self.set_channel_setting(dst, ChanSetting::NoBot, nobot)?;
+        Ok(())
+    }
+
     // Persist a new badword list (whole-list event) and apply it.
     fn write_badwords(&mut self, channel: &str, k: &str, list: Vec<String>) -> Result<(), ChanError> {
         self.log
@@ -2221,6 +2240,9 @@ impl Store for Db {
     fn kicker_test(&self, channel: &str, text: &str) -> Option<String> {
         Db::kicker_test(self, channel, text)
     }
+    fn copy_bot_config(&mut self, src: &str, dst: &str) -> Result<(), ChanError> {
+        Db::copy_bot_config(self, src, dst)
+    }
     fn set_channel_topic(&mut self, channel: &str, topic: &str) -> Result<(), ChanError> {
         Db::set_channel_topic(self, channel, topic)
     }

src/engine/mod.rs

@@ -2354,6 +2354,45 @@ mod tests {
         assert!(!say(&mut e, "[unclosed bracket text").iter().any(|a| matches!(a, NetAction::Kick { .. })), "bad pattern not stored");
     }
 
+    // COPY clones one channel's kicker/badword config onto another.
+    #[test]
+    fn botserv_copy_bot_config() {
+        use fedserv_botserv::BotServ;
+        use fedserv_nickserv::NickServ;
+        let path = std::env::temp_dir().join("fedserv-bscopy.jsonl");
+        let _ = std::fs::remove_file(&path);
+        let mut db = Db::open(&path, "42S");
+        db.scram_iterations = 4096;
+        db.register("boss", "password1", None).unwrap();
+        db.register_channel("#c", "boss").unwrap();
+        db.register_channel("#d", "boss").unwrap();
+        let mut e = Engine::new(
+            vec![
+                Box::new(NickServ { uid: "42SAAAAAA".into(), guest_nick: "Guest".into(), guest_seq: 0 }),
+                Box::new(BotServ { uid: "42SAAAAAD".into() }),
+            ],
+            db,
+        );
+        e.set_sid("42S".into());
+        let mut opers = std::collections::HashMap::new();
+        opers.insert("boss".to_string(), Privs::default().with(fedserv_api::Priv::Admin));
+        e.set_opers(opers);
+        let bs = |e: &mut Engine, t: &str| e.handle(NetEvent::Privmsg { from: "000AAAAAB".into(), to: "42SAAAAAD".into(), text: t.into() });
+        e.handle(NetEvent::UserConnect { uid: "000AAAAAB".into(), nick: "boss".into(), host: "h".into() });
+        e.handle(NetEvent::Privmsg { from: "000AAAAAB".into(), to: "42SAAAAAA".into(), text: "IDENTIFY password1".into() });
+        bs(&mut e, "KICK #c CAPS ON");
+        bs(&mut e, "BADWORDS #c ADD fr[ao]g");
+        bs(&mut e, "KICK #c BADWORDS ON");
+        let says = |out: &[NetAction], n: &str| out.iter().any(|a| matches!(a, NetAction::Notice { text, .. } if text.contains(n)));
+
+        // #d starts blank, so nothing trips.
+        assert!(says(&bs(&mut e, "KICK #d TEST SHOUTING LOUD ALLCAPS"), "trips no content kicker"), "blank #d");
+        bs(&mut e, "COPY #c #d");
+        // Now #d has #c's caps and badword config.
+        assert!(says(&bs(&mut e, "KICK #d TEST SHOUTING LOUD ALLCAPS"), "would be kicked"), "caps copied");
+        assert!(says(&bs(&mut e, "KICK #d TEST i love frogs"), "would be kicked"), "badwords copied");
+    }
+
     // KICK TEST dry-runs the content kickers against a line without kicking.
     #[test]
     fn botserv_kick_test_dry_run() {