Show message count in session browser dialog

Add NumMessages field to session.Summary and populate it from both
SQLite (via LEFT JOIN on session_items) and InMemory stores. Display
the count in the session browser as '(N)' next to each session title.

Assisted-By: cagent

Author: dgageot

pkg/session/session.go

@@ -418,6 +418,16 @@ func (s *Session) IsSubSession() bool {
 	return s.ParentID != ""
 }
 
+// MessageCount returns the number of items that contain a message.
+func (s *Session) MessageCount() int {
+	n := 0
+	for _, item := range s.Messages {
+		if item.IsMessage() {
+			n++
+		}
+	}
+	return n
+}
 // New creates a new agent session
 func New(opts ...Opt) *Session {
 	sessionID := uuid.New().String()

pkg/session/store.go

@@ -71,6 +71,7 @@ type Summary struct {
 	CreatedAt             time.Time
 	Starred               bool
 	BranchParentSessionID string
+	NumMessages           int
 }
 
 // Store defines the interface for session storage
@@ -164,6 +165,7 @@ func (s *InMemorySessionStore) GetSessionSummaries(_ context.Context) ([]Summary
 			CreatedAt:             value.CreatedAt,
 			Starred:               value.Starred,
 			BranchParentSessionID: value.BranchParentSessionID,
+			NumMessages:           value.MessageCount(),
 		})
 		return true
 	})
@@ -878,7 +880,11 @@ func (s *SQLiteSessionStore) GetSessions(ctx context.Context) ([]*Session, error
 // This is much faster than GetSessions as it doesn't load message content.
 func (s *SQLiteSessionStore) GetSessionSummaries(ctx context.Context) ([]Summary, error) {
 	rows, err := s.db.QueryContext(ctx,
-		"SELECT id, title, created_at, starred, branch_parent_session_id FROM sessions WHERE parent_id IS NULL OR parent_id = '' ORDER BY created_at DESC")
+		`SELECT s.id, s.title, s.created_at, s.starred, s.branch_parent_session_id,
+		        (SELECT COUNT(*) FROM session_items si WHERE si.session_id = s.id AND si.item_type = 'message')
+		 FROM sessions s
+		 WHERE s.parent_id IS NULL OR s.parent_id = ''
+		 ORDER BY s.created_at DESC`)
 	if err != nil {
 		return nil, err
 	}
@@ -888,7 +894,8 @@ func (s *SQLiteSessionStore) GetSessionSummaries(ctx context.Context) ([]Summary
 	for rows.Next() {
 		var id, title, createdAtStr, starredStr string
 		var branchParentID sql.NullString
-		if err := rows.Scan(&id, &title, &createdAtStr, &starredStr, &branchParentID); err != nil {
+		var numMessages int
+		if err := rows.Scan(&id, &title, &createdAtStr, &starredStr, &branchParentID, &numMessages); err != nil {
 			return nil, err
 		}
 		createdAt, err := time.Parse(time.RFC3339, createdAtStr)
@@ -905,6 +912,7 @@ func (s *SQLiteSessionStore) GetSessionSummaries(ctx context.Context) ([]Summary
 			CreatedAt:             createdAt,
 			Starred:               starred,
 			BranchParentSessionID: branchParentID.String,
+			NumMessages:           numMessages,
 		})
 	}
 

pkg/session/store_test.go

@@ -215,10 +215,12 @@ func TestGetSessionSummaries(t *testing.T) {
 	assert.Equal(t, "session-2", summaries[0].ID)
 	assert.Equal(t, "Second Session", summaries[0].Title)
 	assert.Equal(t, session2Time, summaries[0].CreatedAt)
+	assert.Equal(t, 1, summaries[0].NumMessages)
 
 	assert.Equal(t, "session-1", summaries[1].ID)
 	assert.Equal(t, "First Session", summaries[1].Title)
 	assert.Equal(t, session1Time, summaries[1].CreatedAt)
+	assert.Equal(t, 1, summaries[1].NumMessages)
 }
 
 func TestBranchSessionCopiesPrefix(t *testing.T) {

pkg/tui/dialog/session_browser.go

@@ -317,13 +317,15 @@ func (d *sessionBrowserDialog) renderSession(sess session.Summary, selected bool
 		title = "Untitled"
 	}
 
+	suffix := fmt.Sprintf(" (%d) • %s", sess.NumMessages, d.timeAgo(sess.CreatedAt))
+
 	starWidth := 3
-	maxTitleLen := maxWidth - 25 - starWidth
+	maxTitleLen := max(1, maxWidth-len(suffix)-starWidth)
 	if len(title) > maxTitleLen {
 		title = title[:maxTitleLen-1] + "…"
 	}
 
-	return styles.StarIndicator(sess.Starred) + titleStyle.Render(title) + timeStyle.Render(" • "+d.timeAgo(sess.CreatedAt))
+	return styles.StarIndicator(sess.Starred) + titleStyle.Render(title) + timeStyle.Render(suffix)
 }
 
 func (d *sessionBrowserDialog) timeAgo(t time.Time) string {