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.

botserv/src/copy.rs

@@ -0,0 +1,17 @@
+use fedserv_api::{Sender, ServiceCtx, Store};
+
+// COPY <#source> <#dest>: copy a channel's bot configuration — kickers,
+// badwords, greet and nobot — onto another. Requires founder-or-admin on both.
+pub fn handle(me: &str, from: &Sender, args: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store) {
+    let (Some(&src), Some(&dst)) = (args.get(1), args.get(2)) else {
+        ctx.notice(me, from.uid, "Syntax: COPY <#source> <#dest>");
+        return;
+    };
+    if !super::require_channel_admin(me, from, src, ctx, db) || !super::require_channel_admin(me, from, dst, ctx, db) {
+        return;
+    }
+    match db.copy_bot_config(src, dst) {
+        Ok(()) => ctx.notice(me, from.uid, format!("Copied \x02{src}\x02's bot settings (kickers, badwords, greet, nobot) to \x02{dst}\x02.")),
+        Err(_) => ctx.notice(me, from.uid, "Sorry, that didn't work. Please try again in a moment."),
+    }
+}