fix: quick scrolling through lots of previews

Author: cfoust

pkg/replay/loader/module.go

@@ -51,8 +51,16 @@ func (l *Loader) Init() tea.Cmd {
 			}
 		}
 
+		ctx := l.Lifetime.Ctx()
+
 		events := make([]sessions.Event, 0)
 		for {
+			if ctx.Err() != nil {
+				return loadedEvent{
+					err: ctx.Err(),
+				}
+			}
+
 			event, err := reader.Read()
 			if err == io.EOF || err == io.ErrUnexpectedEOF {
 				break
@@ -65,10 +73,16 @@ func (l *Loader) Init() tea.Cmd {
 			events = append(events, event)
 		}
 
-		ctx := l.Lifetime.Ctx()
+		p, err := player.FromEventsContext(ctx, events)
+		if err != nil {
+			return loadedEvent{
+				err: err,
+			}
+		}
+
 		replay := replay.New(
 			ctx,
-			player.FromEvents(events),
+			p,
 			l.timeBinds,
 			l.copyBinds,
 			l.options...,

pkg/replay/player/module.go

@@ -1,6 +1,8 @@
 package player
 
 import (
+	"context"
+
 	"github.com/cfoust/cy/pkg/emu"
 	"github.com/cfoust/cy/pkg/geom"
 	"github.com/cfoust/cy/pkg/geom/tty"
@@ -183,3 +185,22 @@ func FromEvents(events []sessions.Event) *Player {
 
 	return player
 }
+
+// FromEventsContext creates a Player from the given events, but stops if the
+// context is cancelled.
+func FromEventsContext(
+	ctx context.Context,
+	events []sessions.Event,
+) (*Player, error) {
+	player := New()
+
+	for _, event := range events {
+		if ctx.Err() != nil {
+			return nil, ctx.Err()
+		}
+
+		player.Process(event)
+	}
+
+	return player, nil
+}