pack-objects: show some progress when counting kept objects

We only show progress when there are new objects to be packed. But
when --keep-pack is specified on the base pack, we will exclude most
of objects. This makes 'pack-objects' stay silent for a long time
while the counting phase is going.

Let's show some progress whenever we visit an object instead. The old
"Counting objects" is renamed to "Enumerating objects" and a new
progress "Counting objects" line is added.

This new "Counting objects" line should progress pretty quick when the
system is beefy. But when the system is under pressure, the reading
object header done in this phase could be slow and showing progress is
an improvement over staying silent in the current code.
Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin/pack-objects.c

@@ -46,7 +46,7 @@ static const char *pack_usage[] = {
 static struct packing_data to_pack;
 
 static struct pack_idx_entry **written_list;
-static uint32_t nr_result, nr_written;
+static uint32_t nr_result, nr_written, nr_seen;
 
 static int non_empty;
 static int reuse_delta = 1, reuse_object = 1;
@@ -1096,6 +1096,8 @@ static int add_object_entry(const struct object_id *oid, enum object_type type,
 	off_t found_offset = 0;
 	uint32_t index_pos;
 
+	display_progress(progress_state, ++nr_seen);
+
 	if (have_duplicate_entry(oid, exclude, &index_pos))
 		return 0;
 
@@ -1111,8 +1113,6 @@ static int add_object_entry(const struct object_id *oid, enum object_type type,
 	create_object_entry(oid, type, pack_name_hash(name),
 			    exclude, name && no_try_delta(name),
 			    index_pos, found_pack, found_offset);
-
-	display_progress(progress_state, nr_result);
 	return 1;
 }
 
@@ -1123,6 +1123,8 @@ static int add_object_entry_from_bitmap(const struct object_id *oid,
 {
 	uint32_t index_pos;
 
+	display_progress(progress_state, ++nr_seen);
+
 	if (have_duplicate_entry(oid, 0, &index_pos))
 		return 0;
 
@@ -1130,8 +1132,6 @@ static int add_object_entry_from_bitmap(const struct object_id *oid,
 		return 0;
 
 	create_object_entry(oid, type, name_hash, 0, 0, index_pos, pack, offset);
-
-	display_progress(progress_state, nr_result);
 	return 1;
 }
 
@@ -1716,6 +1716,10 @@ static void get_object_details(void)
 	uint32_t i;
 	struct object_entry **sorted_by_offset;
 
+	if (progress)
+		progress_state = start_progress(_("Counting objects"),
+						to_pack.nr_objects);
+
 	sorted_by_offset = xcalloc(to_pack.nr_objects, sizeof(struct object_entry *));
 	for (i = 0; i < to_pack.nr_objects; i++)
 		sorted_by_offset[i] = to_pack.objects + i;
@@ -1726,7 +1730,9 @@ static void get_object_details(void)
 		check_object(entry);
 		if (big_file_threshold < entry->size)
 			entry->no_try_delta = 1;
+		display_progress(progress_state, i + 1);
 	}
+	stop_progress(&progress_state);
 
 	/*
 	 * This must happen in a second pass, since we rely on the delta
@@ -3209,7 +3215,7 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 	}
 
 	if (progress)
-		progress_state = start_progress(_("Counting objects"), 0);
+		progress_state = start_progress(_("Enumerating objects"), 0);
 	if (!use_internal_rev_list)
 		read_object_list_from_stdin();
 	else {