Subject: [PATCH 01/14] revision: export commit_stack

From: René Scharfe <[email-masked]>
Date: Wed, 24 Dec 2025 18:03:14 +0100

Dynamic arrays of commit pointers are used in several places.  Some of
them use a custom struct to hold array, item count and capacity, others
have them as separate variables linked by a common name part.

Pick one succinct, clean implementation -- commit_stack -- and convert
the different variants to it to reduce code duplication.

Signed-off-by: René Scharfe <[email-masked]>
---
 commit.c   | 17 +++++++++++++++++
 commit.h   | 10 ++++++++++
 revision.c | 23 -----------------------
 3 files changed, 27 insertions(+), 23 deletions(-)

diff --git a/commit.c b/commit.c
index 709c9eed58..f2edafa49c 100644
--- a/commit.c
+++ b/commit.c
@@ -1981,3 +1981,20 @@ int run_commit_hook(int editor_is_used, const char *index_file,
 	opt.invoked_hook = invoked_hook;
 	return run_hooks_opt(the_repository, name, &opt);
 }
+
+void commit_stack_push(struct commit_stack *stack, struct commit *commit)
+{
+	ALLOC_GROW(stack->items, stack->nr + 1, stack->alloc);
+	stack->items[stack->nr++] = commit;
+}
+
+struct commit *commit_stack_pop(struct commit_stack *stack)
+{
+	return stack->nr ? stack->items[--stack->nr] : NULL;
+}
+
+void commit_stack_clear(struct commit_stack *stack)
+{
+	FREE_AND_NULL(stack->items);
+	stack->nr = stack->alloc = 0;
+}
diff --git a/commit.h b/commit.h
index 5406dd2663..81e047f820 100644
--- a/commit.h
+++ b/commit.h
@@ -381,4 +381,14 @@ int parse_buffer_signed_by_header(const char *buffer,
 				  const struct git_hash_algo *algop);
 int add_header_signature(struct strbuf *buf, struct strbuf *sig, const struct git_hash_algo *algo);
 
+struct commit_stack {
+	struct commit **items;
+	size_t nr, alloc;
+};
+#define COMMIT_STACK_INIT { 0 }
+
+void commit_stack_push(struct commit_stack *, struct commit *);
+struct commit *commit_stack_pop(struct commit_stack *);
+void commit_stack_clear(struct commit_stack *);
+
 #endif /* COMMIT_H */
diff --git a/revision.c b/revision.c
index 5f0850ae5c..1858e093ee 100644
--- a/revision.c
+++ b/revision.c
@@ -250,29 +250,6 @@ void mark_trees_uninteresting_sparse(struct repository *r,
 	paths_and_oids_clear(&map);
 }
 
-struct commit_stack {
-	struct commit **items;
-	size_t nr, alloc;
-};
-#define COMMIT_STACK_INIT { 0 }
-
-static void commit_stack_push(struct commit_stack *stack, struct commit *commit)
-{
-	ALLOC_GROW(stack->items, stack->nr + 1, stack->alloc);
-	stack->items[stack->nr++] = commit;
-}
-
-static struct commit *commit_stack_pop(struct commit_stack *stack)
-{
-	return stack->nr ? stack->items[--stack->nr] : NULL;
-}
-
-static void commit_stack_clear(struct commit_stack *stack)
-{
-	FREE_AND_NULL(stack->items);
-	stack->nr = stack->alloc = 0;
-}
-
 static void mark_one_parent_uninteresting(struct rev_info *revs, struct commit *commit,
 					  struct commit_stack *pending)
 {
-- 
2.52.0