Add notification actions and inline reply

Parse FDO action pairs onto popup buttons, emit ActionInvoked on
click (default action on the body), and show an inline-reply field
when senders request it. Closing still emits NotificationClosed.
History persist is unchanged.

src/notifications/mod.rs

@@ -17,6 +17,28 @@ use zbus::zvariant::OwnedValue;
 /// warning) — it just piles up a new card next to it forever.
 const SYNCHRONOUS_HINT: &str = "x-canonical-private-synchronous";
 
+/// Spec + GNOME/KDE reserved action id for an inline reply field. Hidden
+/// from the button row; submitting the field emits `NotificationReplied`
+/// (and `ActionInvoked` with this key). See `popup::emit_replied`.
+pub const INLINE_REPLY_KEY: &str = "inline-reply";
+
+/// KDE placeholder hint. Presence (or an `inline-reply` action) is enough
+/// to show the reply field — Discord/Telegram use the action, Plasma often
+/// only the hint.
+const KDE_REPLY_PLACEHOLDER: &str = "x-kde-reply-placeholder";
+
+/// Advertised `GetCapabilities` strings. `body` is the original set;
+/// `actions` / `inline-reply` are this change; `body-markup` is the usual
+/// companion so senders can ship `<b>`/`<i>` instead of stripping tags.
+const CAPABILITIES: &[&str] = &["body", "body-markup", "actions", "inline-reply"];
+
+/// One `(id, localized label)` pair from the Notify `actions` array.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Action {
+    pub key: String,
+    pub label: String,
+}
+
 /// How long a shown notification should stay up before auto-dismissing.
 /// Distinct from `Option<Duration>` mainly for readability at call sites —
 /// `Never` covers both the spec's `expire_timeout == 0` ("never expire")
@@ -36,6 +58,9 @@ pub enum NotifEvent {
         body: String,
         urgency: Urgency,
         expire: Expire,
+        actions: Vec<Action>,
+        /// Placeholder for the inline-reply field, if one should be shown.
+        inline_reply: Option<String>,
     },
     Close(u32),
     ToggleHistory,
@@ -68,6 +93,36 @@ impl Urgency {
     }
 }
 
+/// Spec: `actions` is a flat list of pairs `(id, localized label)`. An
+/// unpaired trailing id is ignored. Empty keys are dropped.
+fn parse_actions(raw: &[String]) -> Vec<Action> {
+    raw.chunks_exact(2)
+        .filter(|c| !c[0].is_empty())
+        .map(|c| Action {
+            key: c[0].clone(),
+            label: c[1].clone(),
+        })
+        .collect()
+}
+
+/// Show an inline reply field when the sender asked for `inline-reply` or
+/// sent the KDE placeholder hint. Placeholder text prefers the hint.
+fn inline_reply_placeholder(
+    actions: &[Action],
+    hints: &HashMap<String, OwnedValue>,
+) -> Option<String> {
+    let from_hint = hints
+        .get(KDE_REPLY_PLACEHOLDER)
+        .and_then(|v| String::try_from(v.clone()).ok())
+        .filter(|s| !s.is_empty());
+    let has_action = actions.iter().any(|a| a.key == INLINE_REPLY_KEY);
+    if has_action || from_hint.is_some() {
+        Some(from_hint.unwrap_or_else(|| "Reply".into()))
+    } else {
+        None
+    }
+}
+
 /// Maps a `Notify` call's `expire_timeout` (plus whether the `urgency` hint
 /// was critical) to our internal `Expire`, per the freedesktop notification
 /// spec: `0` always means never expire; a negative value means "server
@@ -122,7 +177,13 @@ const BAR_IFACE: &str = "dev.breadway.Bar";
 /// `breadbar --history`; does not start a second bar.
 pub async fn toggle_history_remote() -> zbus::Result<()> {
     let conn = zbus::Connection::session().await?;
-    conn.call_method(Some(BAR_DEST), BAR_PATH, Some(BAR_IFACE), "ToggleHistory", &())
+    conn.call_method(
+        Some(BAR_DEST),
+        BAR_PATH,
+        Some(BAR_IFACE),
+        "ToggleHistory",
+        &(),
+    )
     .await?;
     Ok(())
 }
@@ -138,7 +199,7 @@ impl NotifServer {
         _app_icon: &str,
         summary: &str,
         body: &str,
-        _actions: Vec<String>,
+        actions: Vec<String>,
         hints: std::collections::HashMap<String, OwnedValue>,
         expire_timeout: i32,
     ) -> u32 {
@@ -171,6 +232,8 @@ impl NotifServer {
         // when the sender left expire_timeout at the server-default (-1).
         let urgency = Urgency::from_hint(hints.get("urgency"));
         let expire = compute_expire(expire_timeout, urgency == Urgency::Critical);
+        let actions = parse_actions(&actions);
+        let inline_reply = inline_reply_placeholder(&actions, &hints);
 
         history::record(
             &self.history,
@@ -196,6 +259,8 @@ impl NotifServer {
                 body: body.to_string(),
                 urgency,
                 expire,
+                actions,
+                inline_reply,
             })
             .await;
         id
@@ -206,7 +271,7 @@ impl NotifServer {
     }
 
     fn get_capabilities(&self) -> Vec<String> {
-        vec!["body".to_string()]
+        CAPABILITIES.iter().map(|s| (*s).to_string()).collect()
     }
 
     fn get_server_information(&self) -> (String, String, String, String) {
@@ -241,6 +306,8 @@ impl SampleKind {
             body: "This is what a notification card looks like.".into(),
             urgency,
             expire: Expire::Never,
+            actions: vec![],
+            inline_reply: None,
         }
     }
 }
@@ -304,8 +371,7 @@ pub fn spawn(sample: Option<SampleKind>) -> gtk4::Window {
             let window_for_loop = window.clone();
             relm4::spawn_local(async move {
                 if let Ok(conn) = conn_rx.await {
-                    popup::run(window_for_loop, cards_box, rx, Some(conn), Some(history_ui))
-                        .await;
+                    popup::run(window_for_loop, cards_box, rx, Some(conn), Some(history_ui)).await;
                 }
             });
         }
@@ -457,10 +523,28 @@ mod tests {
     async fn notify_records_history_newest_first() {
         let (server, _rx) = test_server();
         server
-            .notify("app-a", 0, "", "first", "body-a", vec![], HashMap::new(), -1)
+            .notify(
+                "app-a",
+                0,
+                "",
+                "first",
+                "body-a",
+                vec![],
+                HashMap::new(),
+                -1,
+            )
             .await;
         server
-            .notify("app-b", 0, "", "second", "body-b", vec![], HashMap::new(), -1)
+            .notify(
+                "app-b",
+                0,
+                "",
+                "second",
+                "body-b",
+                vec![],
+                HashMap::new(),
+                -1,
+            )
             .await;
         let hist = server.history.lock().unwrap();
         assert_eq!(hist.len(), 2);
@@ -469,4 +553,115 @@ mod tests {
         assert_eq!(hist[0].body, "body-b");
         assert_eq!(hist[1].summary, "first");
     }
+
+    #[test]
+    fn parse_actions_pairs_and_drops_trailing_id() {
+        let parsed = parse_actions(&[
+            "default".into(),
+            "Open".into(),
+            "snooze".into(),
+            "Snooze".into(),
+            "orphan".into(),
+        ]);
+        assert_eq!(
+            parsed,
+            vec![
+                Action {
+                    key: "default".into(),
+                    label: "Open".into(),
+                },
+                Action {
+                    key: "snooze".into(),
+                    label: "Snooze".into(),
+                },
+            ]
+        );
+    }
+
+    #[test]
+    fn parse_actions_skips_empty_keys() {
+        assert!(parse_actions(&["", "Nope"].map(String::from)).is_empty());
+    }
+
+    #[test]
+    fn inline_reply_from_action_or_kde_hint() {
+        let reply_action = vec![Action {
+            key: INLINE_REPLY_KEY.into(),
+            label: "Reply".into(),
+        }];
+        assert_eq!(
+            inline_reply_placeholder(&reply_action, &HashMap::new()).as_deref(),
+            Some("Reply")
+        );
+        assert!(inline_reply_placeholder(&[], &HashMap::new()).is_none());
+
+        let mut hints = HashMap::new();
+        hints.insert(
+            KDE_REPLY_PLACEHOLDER.to_string(),
+            OwnedValue::try_from(zbus::zvariant::Value::from("Write a reply…")).unwrap(),
+        );
+        assert_eq!(
+            inline_reply_placeholder(&[], &hints).as_deref(),
+            Some("Write a reply…")
+        );
+        // Hint wins over the generic default when both are present.
+        assert_eq!(
+            inline_reply_placeholder(&reply_action, &hints).as_deref(),
+            Some("Write a reply…")
+        );
+    }
+
+    #[test]
+    fn get_capabilities_includes_actions_and_inline_reply() {
+        let (server, _rx) = test_server();
+        let caps = server.get_capabilities();
+        for wanted in ["body", "body-markup", "actions", "inline-reply"] {
+            assert!(
+                caps.iter().any(|c| c == wanted),
+                "missing capability {wanted}"
+            );
+        }
+    }
+
+    #[tokio::test]
+    async fn notify_forwards_actions_and_inline_reply() {
+        let (server, mut rx) = test_server();
+        server
+            .notify(
+                "chat",
+                0,
+                "",
+                "Alice",
+                "hello",
+                vec![
+                    "default".into(),
+                    "Open".into(),
+                    INLINE_REPLY_KEY.into(),
+                    "Reply".into(),
+                ],
+                HashMap::new(),
+                -1,
+            )
+            .await;
+        match rx.recv().await.expect("Show event") {
+            NotifEvent::Show {
+                actions,
+                inline_reply,
+                summary,
+                ..
+            } => {
+                assert_eq!(summary, "Alice");
+                assert_eq!(actions.len(), 2);
+                assert_eq!(actions[0].key, "default");
+                assert_eq!(actions[1].key, INLINE_REPLY_KEY);
+                assert_eq!(inline_reply.as_deref(), Some("Reply"));
+            }
+            _ => panic!("expected Show, got a different event"),
+        }
+        // History persist path is unchanged: actions are UI-only, not stored.
+        let hist = server.history.lock().unwrap();
+        assert_eq!(hist.len(), 1);
+        assert_eq!(hist[0].summary, "Alice");
+        assert_eq!(hist[0].body, "hello");
+    }
 }

src/notifications/popup.rs

@@ -1,10 +1,10 @@
 use std::{cell::RefCell, collections::HashMap, rc::Rc};
 
 use gtk4::prelude::*;
-use gtk4_layer_shell::{Edge, Layer, LayerShell};
+use gtk4_layer_shell::{Edge, KeyboardMode, Layer, LayerShell};
 use tokio::sync::mpsc::Receiver;
 
-use super::{history, Expire, NotifEvent, Urgency};
+use super::{history, Action, Expire, NotifEvent, Urgency, INLINE_REPLY_KEY};
 
 type Cards = Rc<RefCell<HashMap<u32, gtk4::Box>>>;
 // Bumped every time an id gets a (re)placed card — an auto-dismiss timer
@@ -18,7 +18,6 @@ type Generations = Rc<RefCell<HashMap<u32, u64>>>;
 /// NotificationClosed reason codes per the freedesktop spec.
 mod close_reason {
     pub const EXPIRED: u32 = 1;
-    #[allow(dead_code)] // no in-app dismiss button exists yet (see make_card)
     pub const DISMISSED_BY_USER: u32 = 2;
     pub const CLOSE_NOTIFICATION_CALL: u32 = 3;
 }
@@ -63,12 +62,26 @@ pub async fn run(
                 body,
                 urgency,
                 expire,
+                actions,
+                inline_reply,
             } => {
                 // Replace existing card with same id (replaces_id case)
                 if let Some(old) = cards.borrow_mut().remove(&id) {
                     cards_box.remove(&old);
                 }
-                let card = make_card(&app_name, &summary, &body, urgency);
+                let card = make_card(CardSpec {
+                    id,
+                    app_name: &app_name,
+                    summary: &summary,
+                    body: &body,
+                    urgency,
+                    actions: &actions,
+                    inline_reply: inline_reply.as_deref(),
+                    conn: conn.clone(),
+                    cards: cards.clone(),
+                    cards_box: cards_box.clone(),
+                    window: window.clone(),
+                });
                 cards_box.prepend(&card);
                 cards.borrow_mut().insert(id, card.clone());
                 window.set_visible(true);
@@ -96,8 +109,7 @@ pub async fn run(
                         gtk4::glib::timeout_future(duration).await;
                         let still_current =
                             generations_clone.borrow().get(&id) == Some(&my_generation);
-                        if still_current
-                            && dismiss(&cards_box_clone, &win_clone, &cards_clone, id)
+                        if still_current && dismiss(&cards_box_clone, &win_clone, &cards_clone, id)
                         {
                             emit_closed(&conn_clone, id, close_reason::EXPIRED).await;
                         }
@@ -164,39 +176,226 @@ fn create_window() -> gtk4::Window {
     window.set_margin(Edge::Top, 20);
     window.set_margin(Edge::Right, 20);
     window.set_default_width(320);
+    // OnDemand so an inline-reply GtkEntry can take keys without the popup
+    // stealing every keystroke the rest of the time.
+    window.set_keyboard_mode(KeyboardMode::OnDemand);
     window
 }
 
-fn make_card(app_name: &str, summary: &str, body: &str, urgency: Urgency) -> gtk4::Box {
+struct CardSpec<'a> {
+    id: u32,
+    app_name: &'a str,
+    summary: &'a str,
+    body: &'a str,
+    urgency: Urgency,
+    actions: &'a [Action],
+    inline_reply: Option<&'a str>,
+    conn: Option<zbus::Connection>,
+    cards: Cards,
+    cards_box: gtk4::Box,
+    window: gtk4::Window,
+}
+
+fn make_card(spec: CardSpec<'_>) -> gtk4::Box {
     let card = gtk4::Box::new(gtk4::Orientation::Vertical, 4);
     card.add_css_class("notification-card");
-    if let Some(class) = urgency.css_class() {
+    if let Some(class) = spec.urgency.css_class() {
         card.add_css_class(class);
     }
 
+    let content = gtk4::Box::new(gtk4::Orientation::Vertical, 4);
+
     // Senders often set the title/summary to their own app name (e.g. a bare
     // "Spotify" notification) — showing app_name above an identical summary
     // is pure repetition, so skip the app label in that case.
-    if !app_name.is_empty() && !app_name.eq_ignore_ascii_case(summary) {
-        let lbl = gtk4::Label::new(Some(app_name));
+    if !spec.app_name.is_empty() && !spec.app_name.eq_ignore_ascii_case(spec.summary) {
+        let lbl = gtk4::Label::new(Some(spec.app_name));
         lbl.add_css_class("notification-app");
         lbl.set_xalign(0.0);
-        card.append(&lbl);
+        content.append(&lbl);
     }
 
-    let summary_lbl = gtk4::Label::new(Some(summary));
+    let summary_lbl = gtk4::Label::new(Some(spec.summary));
     summary_lbl.add_css_class("notification-summary");
     summary_lbl.set_xalign(0.0);
     summary_lbl.set_wrap(true);
-    card.append(&summary_lbl);
+    content.append(&summary_lbl);
 
-    if !body.is_empty() {
-        let body_lbl = gtk4::Label::new(Some(body));
+    if !spec.body.is_empty() {
+        let body_lbl = gtk4::Label::new(None);
         body_lbl.add_css_class("notification-body");
         body_lbl.set_xalign(0.0);
         body_lbl.set_wrap(true);
-        card.append(&body_lbl);
+        apply_body_text(&body_lbl, spec.body);
+        content.append(&body_lbl);
+    }
+
+    if spec.actions.iter().any(|a| a.key == "default") {
+        content.add_css_class("notification-default");
+        let gesture = gtk4::GestureClick::new();
+        let invoke = Invoke {
+            conn: spec.conn.clone(),
+            cards: spec.cards.clone(),
+            cards_box: spec.cards_box.clone(),
+            window: spec.window.clone(),
+            id: spec.id,
+        };
+        gesture.connect_released(move |_, _, _, _| {
+            invoke_action(invoke.clone(), "default");
+        });
+        content.add_controller(gesture);
+    }
+
+    card.append(&content);
+
+    let visible: Vec<&Action> = spec
+        .actions
+        .iter()
+        .filter(|a| a.key != "default" && a.key != INLINE_REPLY_KEY)
+        .collect();
+    if !visible.is_empty() {
+        let row = gtk4::Box::new(gtk4::Orientation::Horizontal, 4);
+        row.add_css_class("notification-actions");
+        row.set_halign(gtk4::Align::End);
+        for action in visible {
+            let btn = gtk4::Button::with_label(&action.label);
+            btn.add_css_class("notification-action");
+            let invoke = Invoke {
+                conn: spec.conn.clone(),
+                cards: spec.cards.clone(),
+                cards_box: spec.cards_box.clone(),
+                window: spec.window.clone(),
+                id: spec.id,
+            };
+            let key = action.key.clone();
+            btn.connect_clicked(move |_| {
+                invoke_action(invoke.clone(), &key);
+            });
+            row.append(&btn);
+        }
+        card.append(&row);
+    }
+
+    if let Some(placeholder) = spec.inline_reply {
+        let row = gtk4::Box::new(gtk4::Orientation::Horizontal, 4);
+        row.add_css_class("notification-reply");
+
+        let entry = gtk4::Entry::new();
+        entry.add_css_class("notification-reply-entry");
+        entry.set_placeholder_text(Some(placeholder));
+        entry.set_hexpand(true);
+
+        let send_label = spec
+            .actions
+            .iter()
+            .find(|a| a.key == INLINE_REPLY_KEY)
+            .map(|a| a.label.as_str())
+            .filter(|l| !l.is_empty())
+            .unwrap_or("Send");
+        let send = gtk4::Button::with_label(send_label);
+        send.add_css_class("notification-action");
+
+        let invoke = Invoke {
+            conn: spec.conn.clone(),
+            cards: spec.cards.clone(),
+            cards_box: spec.cards_box.clone(),
+            window: spec.window.clone(),
+            id: spec.id,
+        };
+        let entry_for_btn = entry.clone();
+        let invoke_btn = invoke.clone();
+        send.connect_clicked(move |_| {
+            submit_reply(&entry_for_btn, invoke_btn.clone());
+        });
+        entry.connect_activate(move |e| {
+            submit_reply(e, invoke.clone());
+        });
+
+        row.append(&entry);
+        row.append(&send);
+        card.append(&row);
     }
 
     card
 }
+
+/// FDO `body-markup` is a small Pango-ish subset (`<b>`, `<i>`, `<u>`,
+/// `<a href>`). Invalid markup falls back to plain text so a bad sender
+/// doesn't blank the card.
+fn apply_body_text(label: &gtk4::Label, body: &str) {
+    if body.contains('<') && gtk4::pango::parse_markup(body, '\0').is_ok() {
+        label.set_markup(body);
+        return;
+    }
+    label.set_text(body);
+}
+
+#[derive(Clone)]
+struct Invoke {
+    conn: Option<zbus::Connection>,
+    cards: Cards,
+    cards_box: gtk4::Box,
+    window: gtk4::Window,
+    id: u32,
+}
+
+fn invoke_action(invoke: Invoke, key: &str) {
+    let key = key.to_string();
+    relm4::spawn_local(async move {
+        emit_action(&invoke.conn, invoke.id, &key).await;
+        if dismiss(&invoke.cards_box, &invoke.window, &invoke.cards, invoke.id) {
+            emit_closed(&invoke.conn, invoke.id, close_reason::DISMISSED_BY_USER).await;
+        }
+    });
+}
+
+fn submit_reply(entry: &gtk4::Entry, invoke: Invoke) {
+    let text = entry.text().to_string();
+    if text.trim().is_empty() {
+        return;
+    }
+    relm4::spawn_local(async move {
+        emit_replied(&invoke.conn, invoke.id, &text).await;
+        emit_action(&invoke.conn, invoke.id, INLINE_REPLY_KEY).await;
+        if dismiss(&invoke.cards_box, &invoke.window, &invoke.cards, invoke.id) {
+            emit_closed(&invoke.conn, invoke.id, close_reason::DISMISSED_BY_USER).await;
+        }
+    });
+}
+
+async fn emit_action(conn: &Option<zbus::Connection>, id: u32, action_key: &str) {
+    let Some(conn) = conn else { return };
+    let result = conn
+        .emit_signal(
+            None::<&str>,
+            "/org/freedesktop/Notifications",
+            "org.freedesktop.Notifications",
+            "ActionInvoked",
+            &(id, action_key),
+        )
+        .await;
+    if let Err(e) = result {
+        eprintln!("breadbar: failed to emit ActionInvoked for {id}: {e}");
+    }
+}
+
+/// GNOME/KDE (and clients such as Discord/Telegram) listen for this
+/// non-spec signal on `org.freedesktop.Notifications` when the user
+/// submits an inline reply. Signature: `NotificationReplied(u32 id, s text)`.
+/// We also emit `ActionInvoked(id, "inline-reply")` so senders that only
+/// watch the spec signal still see the send.
+async fn emit_replied(conn: &Option<zbus::Connection>, id: u32, text: &str) {
+    let Some(conn) = conn else { return };
+    let result = conn
+        .emit_signal(
+            None::<&str>,
+            "/org/freedesktop/Notifications",
+            "org.freedesktop.Notifications",
+            "NotificationReplied",
+            &(id, text),
+        )
+        .await;
+    if let Err(e) = result {
+        eprintln!("breadbar: failed to emit NotificationReplied for {id}: {e}");
+    }
+}

src/theme.rs

@@ -44,6 +44,10 @@ fn load_css() -> String {
          .notification-card.urgency-normal {{ border-left-color: {accent}; }}\
          .notification-summary {{ font-weight: bold; }}\
          .notification-app {{ opacity: 0.6; }}\
+         .notification-actions {{ margin-top: 6px; }}\
+         .notification-action {{ padding: 2px 8px; font-size: 11px; }}\
+         .notification-reply {{ margin-top: 6px; }}\
+         .notification-reply-entry {{ min-width: 0; }}\
          .history-title {{ font-weight: bold; font-size: 13px; }}\
          .history-close {{ padding: 2px 8px; }}\
          .history-empty {{ opacity: 0.5; padding: 8px 0; }}\