[PATCH v5 14/27] pack-bitmap.c: introduce 'bitmap_is_preferred_refname()'

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In a recent commit, pack-objects learned support for the
'pack.preferBitmapTips' configuration. This patch prepares the
multi-pack bitmap code to respect this configuration, too.

The yet-to-be implemented code will find that it is more efficient to
check whether each reference contains a prefix found in the configured
set of values rather than doing an additional traversal.

Implement a function 'bitmap_is_preferred_refname()' which will perform
that check. Its caller will be added in a subsequent patch.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 pack-bitmap.c | 16 ++++++++++++++++
 pack-bitmap.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/pack-bitmap.c b/pack-bitmap.c
index 612f62da97..d5296750eb 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -1658,3 +1658,19 @@ const struct string_list *bitmap_preferred_tips(struct repository *r)
 {
 	return repo_config_get_value_multi(r, "pack.preferbitmaptips");
 }
+
+int bitmap_is_preferred_refname(struct repository *r, const char *refname)
+{
+	const struct string_list *preferred_tips = bitmap_preferred_tips(r);
+	struct string_list_item *item;
+
+	if (!preferred_tips)
+		return 0;
+
+	for_each_string_list_item(item, preferred_tips) {
+		if (starts_with(refname, item->string))
+			return 1;
+	}
+
+	return 0;
+}
diff --git a/pack-bitmap.h b/pack-bitmap.h
index 020cd8d868..52ea10de51 100644
--- a/pack-bitmap.h
+++ b/pack-bitmap.h
@@ -94,5 +94,6 @@ void bitmap_writer_finish(struct pack_idx_entry **index,
 			  uint16_t options);
 
 const struct string_list *bitmap_preferred_tips(struct repository *r);
+int bitmap_is_preferred_refname(struct repository *r, const char *refname);
 
 #endif
-- 
2.33.0.96.g73915697e6




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