Support sending and displaying read markers (#11)

src/base.rs

@@ -214,6 +214,8 @@ pub type AsyncProgramStore = Arc<AsyncMutex<ProgramStore>>;
 
 pub type IambResult<T> = UIResult<T, IambInfo>;
 
+pub type Receipts = HashMap<OwnedEventId, Vec<OwnedUserId>>;
+
 #[derive(thiserror::Error, Debug)]
 pub enum IambError {
     #[error("Invalid user identifier: {0}")]
@@ -286,6 +288,9 @@ pub struct RoomInfo {
     pub keys: HashMap<OwnedEventId, MessageKey>,
     pub messages: Messages,
 
+    pub receipts: HashMap<OwnedEventId, Vec<OwnedUserId>>,
+    pub read_till: Option<OwnedEventId>,
+
     pub fetch_id: RoomFetchStatus,
     pub fetch_last: Option<Instant>,
     pub users_typing: Option<(Instant, Vec<OwnedUserId>)>,
@@ -316,7 +321,7 @@ impl RoomInfo {
             MessageEvent::Original(orig) => {
                 orig.content = *new_content;
             },
-            MessageEvent::Local(content) => {
+            MessageEvent::Local(_, content) => {
                 *content = new_content;
             },
             MessageEvent::Redacted(_) => {
@@ -364,7 +369,7 @@ impl RoomInfo {
         }
     }
 
-    fn get_typing_spans(&self, settings: &ApplicationSettings) -> Spans {
+    fn get_typing_spans<'a>(&'a self, settings: &'a ApplicationSettings) -> Spans<'a> {
         let typers = self.get_typers();
         let n = typers.len();
 
@@ -454,6 +459,26 @@ impl ChatStore {
             .unwrap_or_else(|| "Untitled Matrix Room".to_string())
     }
 
+    pub async fn set_receipts(&mut self, receipts: Vec<(OwnedRoomId, Receipts)>) {
+        let mut updates = vec![];
+
+        for (room_id, receipts) in receipts.into_iter() {
+            if let Some(info) = self.rooms.get_mut(&room_id) {
+                info.receipts = receipts;
+
+                if let Some(read_till) = info.read_till.take() {
+                    updates.push((room_id, read_till));
+                }
+            }
+        }
+
+        for (room_id, read_till) in updates.into_iter() {
+            if let Some(room) = self.worker.client.get_joined_room(&room_id) {
+                let _ = room.read_receipt(read_till.as_ref()).await;
+            }
+        }
+    }
+
     pub fn mark_for_load(&mut self, room_id: OwnedRoomId) {
         self.need_load.insert(room_id);
     }
@@ -588,7 +613,7 @@ impl ApplicationInfo for IambInfo {
 #[cfg(test)]
 pub mod tests {
     use super::*;
-    use crate::config::{user_style, user_style_from_color};
+    use crate::config::user_style_from_color;
     use crate::tests::*;
     use modalkit::tui::style::Color;
 

src/config.rs

@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::collections::hash_map::DefaultHasher;
 use std::collections::HashMap;
 use std::fmt;
@@ -52,10 +53,6 @@ pub fn user_style_from_color(color: Color) -> Style {
     Style::default().fg(color).add_modifier(StyleModifier::BOLD)
 }
 
-pub fn user_style(user: &str) -> Style {
-    user_style_from_color(user_color(user))
-}
-
 fn is_profile_char(c: char) -> bool {
     c.is_ascii_alphanumeric() || c == '.' || c == '-'
 }
@@ -181,14 +178,18 @@ fn merge_users(a: Option<UserOverrides>, b: Option<UserOverrides>) -> Option<Use
 
 #[derive(Clone)]
 pub struct TunableValues {
-    pub typing_notice: bool,
+    pub read_receipt_send: bool,
+    pub read_receipt_display: bool,
+    pub typing_notice_send: bool,
     pub typing_notice_display: bool,
     pub users: UserOverrides,
 }
 
 #[derive(Clone, Default, Deserialize)]
 pub struct Tunables {
-    pub typing_notice: Option<bool>,
+    pub read_receipt_send: Option<bool>,
+    pub read_receipt_display: Option<bool>,
+    pub typing_notice_send: Option<bool>,
     pub typing_notice_display: Option<bool>,
     pub users: Option<UserOverrides>,
 }
@@ -196,7 +197,9 @@ pub struct Tunables {
 impl Tunables {
     fn merge(self, other: Self) -> Self {
         Tunables {
-            typing_notice: self.typing_notice.or(other.typing_notice),
+            read_receipt_send: self.read_receipt_send.or(other.read_receipt_send),
+            read_receipt_display: self.read_receipt_display.or(other.read_receipt_display),
+            typing_notice_send: self.typing_notice_send.or(other.typing_notice_send),
             typing_notice_display: self.typing_notice_display.or(other.typing_notice_display),
             users: merge_users(self.users, other.users),
         }
@@ -204,8 +207,10 @@ impl Tunables {
 
     fn values(self) -> TunableValues {
         TunableValues {
-            typing_notice: self.typing_notice.unwrap_or(true),
-            typing_notice_display: self.typing_notice.unwrap_or(true),
+            read_receipt_send: self.read_receipt_send.unwrap_or(true),
+            read_receipt_display: self.read_receipt_display.unwrap_or(true),
+            typing_notice_send: self.typing_notice_send.unwrap_or(true),
+            typing_notice_display: self.typing_notice_display.unwrap_or(true),
             users: self.users.unwrap_or_default(),
         }
     }
@@ -374,24 +379,41 @@ impl ApplicationSettings {
         Ok(settings)
     }
 
-    pub fn get_user_span<'a>(&self, user_id: &'a UserId) -> Span<'a> {
-        if let Some(user) = self.tunables.users.get(user_id) {
-            let color = if let Some(UserColor(c)) = user.color {
-                c
-            } else {
-                user_color(user_id.as_str())
-            };
+    pub fn get_user_char_span<'a>(&self, user_id: &'a UserId) -> Span<'a> {
+        let (color, c) = self
+            .tunables
+            .users
+            .get(user_id)
+            .map(|user| {
+                (
+                    user.color.as_ref().map(|c| c.0),
+                    user.name.as_ref().and_then(|s| s.chars().next()),
+                )
+            })
+            .unwrap_or_default();
 
+        let color = color.unwrap_or_else(|| user_color(user_id.as_str()));
         let style = user_style_from_color(color);
 
-            if let Some(name) = &user.name {
-                Span::styled(name.clone(), style)
-            } else {
-                Span::styled(user_id.as_str(), style)
-            }
-        } else {
-            Span::styled(user_id.as_str(), user_style(user_id.as_str()))
+        let c = c.unwrap_or_else(|| user_id.localpart().chars().next().unwrap_or(' '));
+
+        Span::styled(String::from(c), style)
     }
+
+    pub fn get_user_span<'a>(&self, user_id: &'a UserId) -> Span<'a> {
+        let (color, name) = self
+            .tunables
+            .users
+            .get(user_id)
+            .map(|user| (user.color.as_ref().map(|c| c.0), user.name.clone().map(Cow::Owned)))
+            .unwrap_or_default();
+
+        let user_id = user_id.as_str();
+        let color = color.unwrap_or_else(|| user_color(user_id));
+        let style = user_style_from_color(color);
+        let name = name.unwrap_or(Cow::Borrowed(user_id));
+
+        Span::styled(name, style)
     }
 }
 
@@ -461,22 +483,22 @@ mod tests {
     #[test]
     fn test_parse_tunables() {
         let res: Tunables = serde_json::from_str("{}").unwrap();
-        assert_eq!(res.typing_notice, None);
+        assert_eq!(res.typing_notice_send, None);
         assert_eq!(res.typing_notice_display, None);
         assert_eq!(res.users, None);
 
-        let res: Tunables = serde_json::from_str("{\"typing_notice\": true}").unwrap();
-        assert_eq!(res.typing_notice, Some(true));
+        let res: Tunables = serde_json::from_str("{\"typing_notice_send\": true}").unwrap();
+        assert_eq!(res.typing_notice_send, Some(true));
         assert_eq!(res.typing_notice_display, None);
         assert_eq!(res.users, None);
 
-        let res: Tunables = serde_json::from_str("{\"typing_notice\": false}").unwrap();
-        assert_eq!(res.typing_notice, Some(false));
+        let res: Tunables = serde_json::from_str("{\"typing_notice_send\": false}").unwrap();
+        assert_eq!(res.typing_notice_send, Some(false));
         assert_eq!(res.typing_notice_display, None);
         assert_eq!(res.users, None);
 
         let res: Tunables = serde_json::from_str("{\"users\": {}}").unwrap();
-        assert_eq!(res.typing_notice, None);
+        assert_eq!(res.typing_notice_send, None);
         assert_eq!(res.typing_notice_display, None);
         assert_eq!(res.users, Some(HashMap::new()));
 
@@ -484,7 +506,7 @@ mod tests {
             "{\"users\": {\"@a:b.c\": {\"color\": \"black\", \"name\": \"Tim\"}}}",
         )
         .unwrap();
-        assert_eq!(res.typing_notice, None);
+        assert_eq!(res.typing_notice_send, None);
         assert_eq!(res.typing_notice_display, None);
         let users = vec![(user_id!("@a:b.c").to_owned(), UserDisplayTunables {
             color: Some(UserColor(Color::Black)),

src/message/mod.rs

@@ -4,6 +4,7 @@ use std::collections::hash_map::DefaultHasher;
 use std::collections::BTreeMap;
 use std::convert::TryFrom;
 use std::hash::{Hash, Hasher};
+use std::slice::Iter;
 
 use chrono::{DateTime, NaiveDateTime, Utc};
 use unicode_width::UnicodeWidthStr;
@@ -25,6 +26,7 @@ use matrix_sdk::ruma::{
         },
         Redact,
     },
+    EventId,
     MilliSecondsSinceUnixEpoch,
     OwnedEventId,
     OwnedUserId,
@@ -54,20 +56,28 @@ pub type MessageFetchResult = IambResult<(Option<String>, Vec<RoomMessageEvent>)
 pub type MessageKey = (MessageTimeStamp, OwnedEventId);
 pub type Messages = BTreeMap<MessageKey, Message>;
 
-const USER_GUTTER: usize = 30;
-const TIME_GUTTER: usize = 12;
-const MIN_MSG_LEN: usize = 30;
-
-const USER_GUTTER_EMPTY: &str = "                              ";
-const USER_GUTTER_EMPTY_SPAN: Span<'static> = Span {
-    content: Cow::Borrowed(USER_GUTTER_EMPTY),
+const fn span_static(s: &'static str) -> Span<'static> {
+    Span {
+        content: Cow::Borrowed(s),
         style: Style {
             fg: None,
             bg: None,
             add_modifier: StyleModifier::empty(),
             sub_modifier: StyleModifier::empty(),
         },
-};
+    }
+}
+
+const USER_GUTTER: usize = 30;
+const TIME_GUTTER: usize = 12;
+const READ_GUTTER: usize = 5;
+const MIN_MSG_LEN: usize = 30;
+
+const USER_GUTTER_EMPTY: &str = "                              ";
+const USER_GUTTER_EMPTY_SPAN: Span<'static> = span_static(USER_GUTTER_EMPTY);
+
+const TIME_GUTTER_EMPTY: &str = "            ";
+const TIME_GUTTER_EMPTY_SPAN: Span<'static> = span_static(TIME_GUTTER_EMPTY);
 
 #[derive(thiserror::Error, Debug)]
 pub enum TimeStampIntError {
@@ -271,10 +281,18 @@ impl PartialOrd for MessageCursor {
 pub enum MessageEvent {
     Original(Box<OriginalRoomMessageEvent>),
     Redacted(Box<RedactedRoomMessageEvent>),
-    Local(Box<RoomMessageEventContent>),
+    Local(OwnedEventId, Box<RoomMessageEventContent>),
 }
 
 impl MessageEvent {
+    pub fn event_id(&self) -> &EventId {
+        match self {
+            MessageEvent::Original(ev) => ev.event_id.as_ref(),
+            MessageEvent::Redacted(ev) => ev.event_id.as_ref(),
+            MessageEvent::Local(event_id, _) => event_id.as_ref(),
+        }
+    }
+
     pub fn body(&self) -> Cow<'_, str> {
         match self {
             MessageEvent::Original(ev) => body_cow_content(&ev.content),
@@ -292,7 +310,7 @@ impl MessageEvent {
                     Cow::Borrowed("[Redacted]")
                 }
             },
-            MessageEvent::Local(content) => body_cow_content(content),
+            MessageEvent::Local(_, content) => body_cow_content(content),
         }
     }
 
@@ -300,7 +318,7 @@ impl MessageEvent {
         let content = match self {
             MessageEvent::Original(ev) => &ev.content,
             MessageEvent::Redacted(_) => return None,
-            MessageEvent::Local(content) => content,
+            MessageEvent::Local(_, content) => content,
         };
 
         if let MessageType::Text(content) = &content.msgtype {
@@ -317,7 +335,7 @@ impl MessageEvent {
     pub fn redact(&mut self, redaction: SyncRoomRedactionEvent, version: &RoomVersionId) {
         match self {
             MessageEvent::Redacted(_) => return,
-            MessageEvent::Local(_) => return,
+            MessageEvent::Local(_, _) => return,
             MessageEvent::Original(ev) => {
                 let redacted = ev.clone().redact(redaction, version);
                 *self = MessageEvent::Redacted(Box::new(redacted));
@@ -354,27 +372,65 @@ fn body_cow_content(content: &RoomMessageEventContent) -> Cow<'_, str> {
     Cow::Borrowed(s)
 }
 
-enum MessageColumns<'a> {
-    Three(usize, Option<Span<'a>>, Option<Span<'a>>),
-    Two(usize, Option<Span<'a>>),
-    One(usize, Option<Span<'a>>),
+enum MessageColumns {
+    /// Four columns: sender, message, timestamp, read receipts.
+    Four,
+
+    /// Three columns: sender, message, timestamp.
+    Three,
+
+    /// Two columns: sender, message.
+    Two,
+
+    /// One column: message with sender on line before the message.
+    One,
 }
 
-impl<'a> MessageColumns<'a> {
+struct MessageFormatter<'a> {
+    settings: &'a ApplicationSettings,
+    cols: MessageColumns,
+    fill: usize,
+    user: Option<Span<'a>>,
+    time: Option<Span<'a>>,
+    read: Iter<'a, OwnedUserId>,
+}
+
+impl<'a> MessageFormatter<'a> {
     fn width(&self) -> usize {
-        match self {
-            MessageColumns::Three(fill, _, _) => *fill,
-            MessageColumns::Two(fill, _) => *fill,
-            MessageColumns::One(fill, _) => *fill,
-        }
+        self.fill
     }
 
     #[inline]
     fn push_spans(&mut self, spans: Spans<'a>, style: Style, text: &mut Text<'a>) {
-        match self {
-            MessageColumns::Three(_, user, time) => {
-                let user = user.take().unwrap_or(USER_GUTTER_EMPTY_SPAN);
-                let time = time.take().unwrap_or_else(|| Span::from(""));
+        match self.cols {
+            MessageColumns::Four => {
+                let settings = self.settings;
+                let user = self.user.take().unwrap_or(USER_GUTTER_EMPTY_SPAN);
+                let time = self.time.take().unwrap_or(TIME_GUTTER_EMPTY_SPAN);
+
+                let mut line = vec![user];
+                line.extend(spans.0);
+                line.push(time);
+
+                // Show read receipts.
+                let user_char =
+                    |user: &'a OwnedUserId| -> Span<'a> { settings.get_user_char_span(user) };
+
+                let a = self.read.next().map(user_char).unwrap_or_else(|| Span::raw(" "));
+                let b = self.read.next().map(user_char).unwrap_or_else(|| Span::raw(" "));
+                let c = self.read.next().map(user_char).unwrap_or_else(|| Span::raw(" "));
+
+                line.push(Span::raw(" "));
+                line.push(c);
+                line.push(b);
+                line.push(a);
+                line.push(Span::raw(" "));
+
+                text.lines.push(Spans(line))
+            },
+            MessageColumns::Three => {
+                let user = self.user.take().unwrap_or(USER_GUTTER_EMPTY_SPAN);
+                let time = self.time.take().unwrap_or_else(|| Span::from(""));
 
                 let mut line = vec![user];
                 line.extend(spans.0);
@@ -382,15 +438,15 @@ impl<'a> MessageColumns<'a> {
 
                 text.lines.push(Spans(line))
             },
-            MessageColumns::Two(_, opt) => {
-                let user = opt.take().unwrap_or(USER_GUTTER_EMPTY_SPAN);
+            MessageColumns::Two => {
+                let user = self.user.take().unwrap_or(USER_GUTTER_EMPTY_SPAN);
                 let mut line = vec![user];
                 line.extend(spans.0);
 
                 text.lines.push(Spans(line));
             },
-            MessageColumns::One(_, opt) => {
-                if let Some(user) = opt.take() {
+            MessageColumns::One => {
+                if let Some(user) = self.user.take() {
                     text.lines.push(Spans(vec![user]));
                 }
 
@@ -428,7 +484,7 @@ impl Message {
 
     pub fn reply_to(&self) -> Option<OwnedEventId> {
         let content = match &self.event {
-            MessageEvent::Local(content) => content,
+            MessageEvent::Local(_, content) => content,
             MessageEvent::Original(ev) => &ev.content,
             MessageEvent::Redacted(_) => return None,
         };
@@ -454,28 +510,50 @@ impl Message {
         return style;
     }
 
-    fn get_render_format(
-        &self,
+    fn get_render_format<'a>(
+        &'a self,
         prev: Option<&Message>,
         width: usize,
-        settings: &ApplicationSettings,
-    ) -> MessageColumns {
-        if USER_GUTTER + TIME_GUTTER + MIN_MSG_LEN <= width {
-            let lw = width - USER_GUTTER - TIME_GUTTER;
+        info: &'a RoomInfo,
+        settings: &'a ApplicationSettings,
+    ) -> MessageFormatter<'a> {
+        if USER_GUTTER + TIME_GUTTER + READ_GUTTER + MIN_MSG_LEN <= width &&
+            settings.tunables.read_receipt_display
+        {
+            let cols = MessageColumns::Four;
+            let fill = width - USER_GUTTER - TIME_GUTTER - READ_GUTTER;
             let user = self.show_sender(prev, true, settings);
             let time = self.timestamp.show();
+            let read = match info.receipts.get(self.event.event_id()) {
+                Some(read) => read.iter(),
+                None => [].iter(),
+            };
 
-            MessageColumns::Three(lw, user, time)
-        } else if USER_GUTTER + MIN_MSG_LEN <= width {
-            let lw = width - USER_GUTTER;
+            MessageFormatter { settings, cols, fill, user, time, read }
+        } else if USER_GUTTER + TIME_GUTTER + MIN_MSG_LEN <= width {
+            let cols = MessageColumns::Three;
+            let fill = width - USER_GUTTER - TIME_GUTTER;
             let user = self.show_sender(prev, true, settings);
+            let time = self.timestamp.show();
+            let read = [].iter();
 
-            MessageColumns::Two(lw, user)
+            MessageFormatter { settings, cols, fill, user, time, read }
+        } else if USER_GUTTER + MIN_MSG_LEN <= width {
+            let cols = MessageColumns::Two;
+            let fill = width - USER_GUTTER;
+            let user = self.show_sender(prev, true, settings);
+            let time = None;
+            let read = [].iter();
+
+            MessageFormatter { settings, cols, fill, user, time, read }
         } else {
-            let lw = width.saturating_sub(2);
+            let cols = MessageColumns::One;
+            let fill = width.saturating_sub(2);
             let user = self.show_sender(prev, false, settings);
+            let time = None;
+            let read = [].iter();
 
-            MessageColumns::One(lw, user)
+            MessageFormatter { settings, cols, fill, user, time, read }
         }
     }
 
@@ -485,12 +563,12 @@ impl Message {
         selected: bool,
         vwctx: &ViewportContext<MessageCursor>,
         info: &'a RoomInfo,
-        settings: &ApplicationSettings,
+        settings: &'a ApplicationSettings,
     ) -> Text<'a> {
         let width = vwctx.get_width();
 
         let style = self.get_render_style(selected);
-        let mut fmt = self.get_render_format(prev, width, settings);
+        let mut fmt = self.get_render_format(prev, width, info, settings);
         let mut text = Text { lines: vec![] };
         let width = fmt.width();
 

src/tests.rs

@@ -15,13 +15,15 @@ use matrix_sdk::ruma::{
 };
 
 use lazy_static::lazy_static;
-use modalkit::tui::style::Color;
+use modalkit::tui::style::{Color, Style};
 use tokio::sync::mpsc::unbounded_channel;
 use url::Url;
 
 use crate::{
     base::{ChatStore, ProgramStore, RoomFetchStatus, RoomInfo},
     config::{
+        user_color,
+        user_style_from_color,
         ApplicationSettings,
         DirectoryValues,
         ProfileConfig,
@@ -60,6 +62,10 @@ lazy_static! {
     pub static ref MSG5_KEY: MessageKey = (OriginServer(UInt::new(8).unwrap()), MSG5_EVID.clone());
 }
 
+pub fn user_style(user: &str) -> Style {
+    user_style_from_color(user_color(user))
+}
+
 pub fn mock_room1_message(
     content: RoomMessageEventContent,
     sender: OwnedUserId,
@@ -82,7 +88,7 @@ pub fn mock_room1_message(
 
 pub fn mock_message1() -> Message {
     let content = RoomMessageEventContent::text_plain("writhe");
-    let content = MessageEvent::Local(content.into());
+    let content = MessageEvent::Local(MSG1_EVID.clone(), content.into());
 
     Message::new(content, TEST_USER1.clone(), MSG1_KEY.0)
 }
@@ -138,10 +144,13 @@ pub fn mock_messages() -> Messages {
 pub fn mock_room() -> RoomInfo {
     RoomInfo {
         name: Some("Watercooler Discussion".into()),
+        tags: None,
 
         keys: mock_keys(),
         messages: mock_messages(),
-        tags: None,
+
+        receipts: HashMap::new(),
+        read_till: None,
 
         fetch_id: RoomFetchStatus::NotStarted,
         fetch_last: None,
@@ -159,7 +168,9 @@ pub fn mock_dirs() -> DirectoryValues {
 
 pub fn mock_tunables() -> TunableValues {
     TunableValues {
-        typing_notice: true,
+        read_receipt_send: true,
+        read_receipt_display: true,
+        typing_notice_send: true,
         typing_notice_display: true,
         users: vec![(TEST_USER5.clone(), UserDisplayTunables {
             color: Some(UserColor(Color::Black)),

src/windows/room/chat.rs

@@ -241,7 +241,7 @@ impl ChatState {
 
                 let ev = match &msg.event {
                     MessageEvent::Original(ev) => &ev.content,
-                    MessageEvent::Local(ev) => ev.deref(),
+                    MessageEvent::Local(_, ev) => ev.deref(),
                     _ => {
                         let msg = "Cannot edit a redacted message";
                         let err = UIError::Failure(msg.into());
@@ -275,9 +275,7 @@ impl ChatState {
 
                 let event_id = match &msg.event {
                     MessageEvent::Original(ev) => ev.event_id.clone(),
-                    MessageEvent::Local(_) => {
-                        self.scrollback.get_key(info).ok_or(IambError::NoSelectedMessage)?.1
-                    },
+                    MessageEvent::Local(event_id, _) => event_id.clone(),
                     MessageEvent::Redacted(_) => {
                         let msg = "";
                         let err = UIError::Failure(msg.into());
@@ -378,8 +376,8 @@ impl ChatState {
 
         if show_echo {
             let user = store.application.settings.profile.user_id.clone();
-            let key = (MessageTimeStamp::LocalEcho, event_id);
-            let msg = MessageEvent::Local(msg.into());
+            let key = (MessageTimeStamp::LocalEcho, event_id.clone());
+            let msg = MessageEvent::Local(event_id, msg.into());
             let msg = Message::new(msg, user, MessageTimeStamp::LocalEcho);
             info.messages.insert(key, msg);
         }
@@ -415,7 +413,7 @@ impl ChatState {
             return;
         }
 
-        if !store.application.settings.tunables.typing_notice {
+        if !store.application.settings.tunables.typing_notice_send {
             return;
         }
 

src/windows/room/scrollback.rs

@@ -1260,7 +1260,13 @@ impl<'a> StatefulWidget for Scrollback<'a> {
             y += 1;
         }
 
-        let first_key = info.messages.first_key_value().map(|f| f.0.clone());
+        if settings.tunables.read_receipt_send && state.cursor.timestamp.is_none() {
+            // If the cursor is at the last message, then update the read marker.
+            info.read_till = info.messages.last_key_value().map(|(k, _)| k.1.clone());
+        }
+
+        // Check whether we should load older messages for this room.
+        let first_key = info.messages.first_key_value().map(|(k, _)| k.clone());
         if first_key == state.viewctx.corner.timestamp {
             // If the top of the screen is the older message, load more.
             self.store.application.mark_for_load(state.room_id.clone());

src/worker.rs

@@ -57,7 +57,7 @@ use matrix_sdk::{
 use modalkit::editing::action::{EditInfo, InfoMessage, UIError};
 
 use crate::{
-    base::{AsyncProgramStore, IambError, IambResult, VerifyAction},
+    base::{AsyncProgramStore, IambError, IambResult, Receipts, VerifyAction},
     message::MessageFetchResult,
     ApplicationSettings,
 };
@@ -99,6 +99,29 @@ fn oneshot<T>() -> (ClientReply<T>, ClientResponse<T>) {
     return (reply, response);
 }
 
+async fn update_receipts(client: &Client) -> Vec<(OwnedRoomId, Receipts)> {
+    let mut rooms = vec![];
+
+    for room in client.joined_rooms() {
+        if let Ok(users) = room.active_members_no_sync().await {
+            let mut receipts = Receipts::new();
+
+            for member in users {
+                let res = room.user_read_receipt(member.user_id()).await;
+
+                if let Ok(Some((event_id, _))) = res {
+                    let user_id = member.user_id().to_owned();
+                    receipts.entry(event_id).or_default().push(user_id);
+                }
+            }
+
+            rooms.push((room.room_id().to_owned(), receipts));
+        }
+    }
+
+    return rooms;
+}
+
 pub type FetchedRoom = (MatrixRoom, DisplayName, Option<Tags>);
 
 pub enum WorkerTask {
@@ -454,7 +477,7 @@ impl ClientWorker {
     }
 
     async fn init(&mut self, store: AsyncProgramStore) {
-        self.client.add_event_handler_context(store);
+        self.client.add_event_handler_context(store.clone());
 
         let _ = self.client.add_event_handler(
             |ev: SyncTypingEvent, room: MatrixRoom, store: Ctx<AsyncProgramStore>| {
@@ -661,6 +684,19 @@ impl ClientWorker {
             },
         );
 
+        let client = self.client.clone();
+        let _ = tokio::spawn(async move {
+            // Update the displayed read receipts ever 5 seconds.
+            let mut interval = tokio::time::interval(Duration::from_secs(5));
+
+            loop {
+                interval.tick().await;
+
+                let receipts = update_receipts(&client).await;
+                store.lock().await.application.set_receipts(receipts).await;
+            }
+        });
+
         self.initialized = true;
     }