modules: move all per-module state/config out of server.rs/config.rs into own files

src/modules/whoisport.rs

@@ -0,0 +1,21 @@
+//! whoisport — InspIRCd `m_whoisport`. Shows an IRC operator, in WHOIS, the
+//! listener port the target connected to. Config-free (derives the port from the
+//! `bind` / `bind_tls` listeners); nothing lives on `Server`.
+
+use crate::server::Server;
+use crate::Uid;
+
+fn port_of(addr: &str) -> u16 {
+    addr.rsplit(':')
+        .next()
+        .and_then(|p| p.parse().ok())
+        .unwrap_or(0)
+}
+
+/// The `is using port N` WHOIS line for opers, or `None` if the port is unknown.
+pub fn line(s: &Server, target: Uid) -> Option<String> {
+    let secure = s.users.get(&target).map(|u| u.secure).unwrap_or(false);
+    let bind = if secure { "bind_tls" } else { "bind" };
+    let port = s.conf(bind).map(port_of).unwrap_or(0);
+    (port != 0).then(|| format!("is using port {port}"))
+}