commands: add a nice terminal progress bar when building the cache

One issue remaining is that writing the cache takes significant time, but I don't know how to reflect that nicely to the user.

1 files changed, 6 insertions, 1 deletions

diff --git a/entity/streamed.go b/entity/streamed.go
index 789224a3..33124ef0 100644
--- a/entity/streamed.go
+++ b/entity/streamed.go
@@ -1,6 +1,11 @@
 package entity
 
 type StreamedEntity[EntityT Interface] struct {
-	Entity EntityT
 	Err    error
+	Entity EntityT
+
+	// CurrentEntity is the index of the current entity being streamed, to express progress.
+	CurrentEntity int64
+	// TotalEntities is the total count of expected entities, if known.
+	TotalEntities int64
 }