feat: update shared directories at runtime

Client::set_shared_directories rescans the given roots into a fresh
in-memory index, swaps it for peers, and re-announces the folder/file
counts to the server. The current directory list moves into the client
context so the running set is queryable. e2e-verified: a browser sees a
directory that was added after login.

soulseek-rs-lib/src/client/connection.rs

@@ -2,7 +2,7 @@ use super::{
     Arc, Client, ClientContext, ClientOperation, ConnectionType, DownloadPeer,
     DownloadStatus, Listen, Peer, PeerRegistry, Receiver, Result, RwLock,
     RwLockExt, Sender, ServerActor, ServerMessage, Shares, SoulseekRs,
-    TcpStream, debug, error, info, mpsc, thread, trace, warn,
+    TcpStream, debug, error, info, mpsc, thread, trace,
 };
 
 impl Client {
@@ -46,6 +46,7 @@ impl Client {
         let shared_folder_count = shares.folder_count();
         let shared_file_count = shares.file_count();
         ctx.shares = shares;
+        ctx.shared_directories = self.shared_directories.clone();
 
         let server_actor = ServerActor::new(
             self.address.clone(),

soulseek-rs-lib/src/client/mod.rs

@@ -202,6 +202,8 @@ pub struct ClientContext {
     pending_connect_tokens: HashMap<u32, String>,
     /// Files we share with peers (read-only after connect).
     pub shares: Arc<Shares>,
+    /// The directories the current share index was built from.
+    pub shared_directories: Vec<String>,
     /// Peer listen addresses learned from GetPeerAddress responses.
     peer_addresses: HashMap<String, (String, u32)>,
     /// Peer messages waiting for a control connection to that peer.
@@ -501,6 +503,7 @@ impl ClientContext {
             private_messages: Vec::new(),
             pending_connect_tokens: HashMap::new(),
             shares: Arc::new(Shares::empty()),
+            shared_directories: Vec::new(),
             peer_addresses: HashMap::new(),
             pending_peer_messages: HashMap::new(),
             uploads: HashMap::new(),
@@ -645,10 +648,51 @@ impl Client {
         }
     }
 
-    /// The directories whose files are shared with other peers.
+    /// The directories whose files are currently shared with other peers.
     #[must_use]
-    pub fn shared_directories(&self) -> &[String] {
-        &self.shared_directories
+    pub fn shared_directories(&self) -> Vec<String> {
+        self.context
+            .read_safe()
+            .map(|ctx| ctx.shared_directories.clone())
+            .unwrap_or_default()
+    }
+
+    /// Replace the shared directories at runtime: rescan into a fresh
+    /// index (served to peers from then on) and re-announce the new
+    /// folder/file counts to the server.
+    ///
+    /// # Errors
+    /// Returns [`SoulseekRs::NotConnected`] if the client is not connected.
+    pub fn set_shared_directories(&self, dirs: Vec<String>) -> Result<()> {
+        let roots: Vec<std::path::PathBuf> = dirs
+            .iter()
+            .filter(|dir| !dir.trim().is_empty())
+            .map(std::path::PathBuf::from)
+            .collect();
+        let shares = if roots.is_empty() {
+            Shares::empty()
+        } else {
+            Shares::scan_many(&roots)
+        };
+        info!(
+            "Now sharing {} files in {} folders from {} directories",
+            shares.file_count(),
+            shares.folder_count(),
+            roots.len()
+        );
+        let folder_count = shares.folder_count();
+        let file_count = shares.file_count();
+        {
+            let mut ctx = self.context.write_safe()?;
+            ctx.shares = Arc::new(shares);
+            ctx.shared_directories = dirs;
+        }
+        self.send_server_message(
+            crate::message::server::MessageFactory::build_shared_folders_message(
+                folder_count,
+                file_count,
+            ),
+        )
     }
 }
 

soulseek-rs-lib/src/client/rooms.rs

@@ -28,7 +28,7 @@ impl Client {
 
     /// Send a raw server message via the server actor, mapping a dead channel
     /// to [`SoulseekRs::NotConnected`].
-    fn send_server_message(
+    pub(super) fn send_server_message(
         &self,
         message: crate::message::Message,
     ) -> Result<()> {

soulseek-rs-lib/src/shares/mod.rs

@@ -46,7 +46,12 @@ impl Shares {
 
         let mut files = Vec::new();
         let mut folder_count = 0;
-        scan_root(root, &root_display_name(root), &mut files, &mut folder_count);
+        scan_root(
+            root,
+            &root_display_name(root),
+            &mut files,
+            &mut folder_count,
+        );
         Ok(Self::from_files(files, folder_count))
     }
 
@@ -278,8 +283,7 @@ mod tests {
     fn scan_many_merges_roots() {
         let root_a = temp_tree();
         let root_b = temp_tree();
-        let shares =
-            Shares::scan_many(&[root_a.clone(), root_b.clone()]);
+        let shares = Shares::scan_many(&[root_a.clone(), root_b.clone()]);
         assert_eq!(shares.file_count(), 6);
         assert_eq!(shares.folder_count(), 4);
         // Files from both roots are reachable under their root's name.
@@ -303,8 +307,7 @@ mod tests {
         std::fs::write(music_a.join("a.mp3"), b"a").unwrap();
         std::fs::write(music_b.join("b.mp3"), b"b").unwrap();
 
-        let shares =
-            Shares::scan_many(&[music_a.clone(), music_b.clone()]);
+        let shares = Shares::scan_many(&[music_a.clone(), music_b.clone()]);
         assert!(shares.get("music\\a.mp3").is_some());
         assert!(
             shares.get("music (2)\\b.mp3").is_some(),

soulseek-rs-lib/tests/e2e.rs

@@ -1249,6 +1249,62 @@ fn two_real_clients_search_and_download() {
     let _ = std::fs::remove_dir_all(download_dir);
 }
 
+#[test]
+fn a_runtime_share_update_is_visible_to_browsers() {
+    let server = server_or_skip!();
+
+    // The sharer starts sharing NOTHING, then adds a directory at runtime
+    // (what the TUI settings screen does).
+    let sharer_port = free_port().expect("sharer port");
+    let mut sharer = Client::with_settings(server.listening_settings(
+        "e2e_reshare",
+        "pw",
+        sharer_port,
+    ));
+    sharer.connect().expect("sharer connect");
+    assert!(sharer.login().expect("sharer login"));
+    assert!(sharer.shared_directories().is_empty());
+
+    let share_dir = unique_download_dir();
+    std::fs::create_dir_all(share_dir.join("new")).unwrap();
+    std::fs::write(share_dir.join("new").join("late.mp3"), b"yyyy").unwrap();
+    sharer
+        .set_shared_directories(vec![share_dir.display().to_string()])
+        .expect("runtime share update");
+    assert_eq!(sharer.shared_directories().len(), 1);
+
+    let browser_port = free_port().expect("browser port");
+    let mut browser = Client::with_settings(server.listening_settings(
+        "e2e_reshare_browser",
+        "pw",
+        browser_port,
+    ));
+    browser.connect().expect("browser connect");
+    assert!(browser.login().expect("browser login"));
+
+    std::thread::sleep(Duration::from_secs(1));
+    browser.browse_user("e2e_reshare").expect("browse request");
+
+    let deadline = Instant::now() + Duration::from_secs(20);
+    let mut listing = None;
+    while Instant::now() < deadline {
+        if let Some(result) = browser.take_browse_result("e2e_reshare") {
+            listing = Some(result);
+            break;
+        }
+        std::thread::sleep(Duration::from_millis(200));
+    }
+    let directories = listing.expect("browser should receive the listing");
+    assert!(
+        directories
+            .iter()
+            .any(|d| d.files.iter().any(|(name, _)| name == "late.mp3")),
+        "the listing should include the file shared at runtime"
+    );
+
+    let _ = std::fs::remove_dir_all(share_dir);
+}
+
 #[test]
 fn browse_a_peers_shared_files() {
     let server = server_or_skip!();

soulseek-rs/src/ui/main_tui/render.rs

@@ -354,7 +354,7 @@ impl MainTui {
         let shortcuts_line = format_shortcuts_styled(&shortcuts);
         // Surface our own sharing status in the block title.
         let shared = self.client.shared_directories();
-        let sharing = match shared {
+        let sharing = match shared.as_slice() {
             [] => "off".to_string(),
             [only] => only.clone(),
             more => format!("{} folders", more.len()),