BotServ: add BOTLIST and AUTOASSIGN default bot

modules/botserv/src/autoassign.rs

@@ -0,0 +1,34 @@
+use echo_api::{Priv, Sender, ServiceCtx, Store};
+
+// AUTOASSIGN <bot> | OFF: set the bot automatically assigned to every newly
+// registered channel, or turn auto-assignment off. Oper-only (Priv::Admin) —
+// it's a network-wide default. No argument reports the current setting.
+pub fn handle(me: &str, from: &Sender, args: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store) {
+    if !from.privs.has(Priv::Admin) {
+        ctx.notice(me, from.uid, "Access denied — AUTOASSIGN is for services operators.");
+        return;
+    }
+    let Some(&arg) = args.get(1) else {
+        match db.default_bot() {
+            Some(bot) => ctx.notice(me, from.uid, format!("New channels are auto-assigned \x02{bot}\x02. Use \x02AUTOASSIGN OFF\x02 to stop.")),
+            None => ctx.notice(me, from.uid, "No bot is auto-assigned to new channels. Set one with \x02AUTOASSIGN <bot>\x02."),
+        }
+        return;
+    };
+    if arg.eq_ignore_ascii_case("OFF") || arg.eq_ignore_ascii_case("NONE") {
+        match db.set_default_bot(None) {
+            Ok(()) => ctx.notice(me, from.uid, "New channels will no longer be auto-assigned a bot."),
+            Err(_) => ctx.notice(me, from.uid, "Sorry, that didn't work. Please try again in a moment."),
+        }
+        return;
+    }
+    // Store the bot's canonical nick, so the setting survives a re-cased lookup.
+    let Some(bot) = db.bots().into_iter().find(|b| b.nick.eq_ignore_ascii_case(arg)) else {
+        ctx.notice(me, from.uid, format!("There's no bot named \x02{arg}\x02. See \x02BOTLIST\x02."));
+        return;
+    };
+    match db.set_default_bot(Some(&bot.nick)) {
+        Ok(()) => ctx.notice(me, from.uid, format!("New channels will be auto-assigned \x02{}\x02.", bot.nick)),
+        Err(_) => ctx.notice(me, from.uid, "Sorry, that didn't work. Please try again in a moment."),
+    }
+}