Subject: [PATCH v7 2/5] trailer: move process_trailers to trailer.h

From: Li Chen <[email-masked]>
Date: Tue, 24 Feb 2026 15:05:48 +0800

Move process_trailers() from builtin/interpret-trailers.c into trailer.c
and expose it via trailer.h.

This lets other call sites reuse the same trailer rewriting logic.

Signed-off-by: Li Chen <[email-masked]>
---
v7:
Rename the input parameter from sb to input.

 builtin/interpret-trailers.c | 36 ------------------------------------
 trailer.c                    | 36 ++++++++++++++++++++++++++++++++++++
 trailer.h                    |  3 +++
 3 files changed, 39 insertions(+), 36 deletions(-)

diff --git a/builtin/interpret-trailers.c b/builtin/interpret-trailers.c
index 69f9d67ec0..1354109e0f 100644
--- a/builtin/interpret-trailers.c
+++ b/builtin/interpret-trailers.c
@@ -136,42 +136,6 @@ static void read_input_file(struct strbuf *sb, const char *file)
 	strbuf_complete_line(sb);
 }
 
-static void process_trailers(const struct process_trailer_options *opts,
-			     struct list_head *new_trailer_head,
-			     struct strbuf *input, struct strbuf *out)
-{
-	LIST_HEAD(head);
-	struct trailer_block *trailer_block;
-
-	trailer_block = parse_trailers(opts, input->buf, &head);
-
-	/* Print the lines before the trailer block */
-	if (!opts->only_trailers)
-		strbuf_add(out, input->buf, trailer_block_start(trailer_block));
-
-	if (!opts->only_trailers && !blank_line_before_trailer_block(trailer_block))
-		strbuf_addch(out, '\n');
-
-	if (!opts->only_input) {
-		LIST_HEAD(config_head);
-		LIST_HEAD(arg_head);
-		parse_trailers_from_config(&config_head);
-		parse_trailers_from_command_line_args(&arg_head, new_trailer_head);
-		list_splice(&config_head, &arg_head);
-		process_trailers_lists(&head, &arg_head);
-	}
-
-	/* Print trailer block. */
-	format_trailers(opts, &head, out);
-	free_trailers(&head);
-
-	/* Print the lines after the trailer block as is. */
-	if (!opts->only_trailers)
-		strbuf_add(out, input->buf + trailer_block_end(trailer_block),
-			   input->len - trailer_block_end(trailer_block));
-	trailer_block_release(trailer_block);
-}
-
 static void interpret_trailers(const struct process_trailer_options *opts,
 			       struct list_head *new_trailer_head,
 			       const char *file)
diff --git a/trailer.c b/trailer.c
index 911a81ed99..0c9200506d 100644
--- a/trailer.c
+++ b/trailer.c
@@ -1235,3 +1235,39 @@ int amend_file_with_trailers(const char *path, const struct strvec *trailer_args
 	strvec_pushv(&run_trailer.args, trailer_args->v);
 	return run_command(&run_trailer);
 }
+
+void process_trailers(const struct process_trailer_options *opts,
+		      struct list_head *new_trailer_head,
+		      struct strbuf *input, struct strbuf *out)
+{
+	LIST_HEAD(head);
+	struct trailer_block *trailer_block;
+
+	trailer_block = parse_trailers(opts, input->buf, &head);
+
+	/* Print the lines before the trailer block */
+	if (!opts->only_trailers)
+		strbuf_add(out, input->buf, trailer_block_start(trailer_block));
+
+	if (!opts->only_trailers && !blank_line_before_trailer_block(trailer_block))
+		strbuf_addch(out, '\n');
+
+	if (!opts->only_input) {
+		LIST_HEAD(config_head);
+		LIST_HEAD(arg_head);
+		parse_trailers_from_config(&config_head);
+		parse_trailers_from_command_line_args(&arg_head, new_trailer_head);
+		list_splice(&config_head, &arg_head);
+		process_trailers_lists(&head, &arg_head);
+	}
+
+	/* Print trailer block. */
+	format_trailers(opts, &head, out);
+	free_trailers(&head);
+
+	/* Print the lines after the trailer block as is. */
+	if (!opts->only_trailers)
+		strbuf_add(out, input->buf + trailer_block_end(trailer_block),
+			   input->len - trailer_block_end(trailer_block));
+	trailer_block_release(trailer_block);
+}
diff --git a/trailer.h b/trailer.h
index 4740549586..531fa1a13f 100644
--- a/trailer.h
+++ b/trailer.h
@@ -202,4 +202,7 @@ void trailer_iterator_release(struct trailer_iterator *iter);
  */
 int amend_file_with_trailers(const char *path, const struct strvec *trailer_args);
 
+void process_trailers(const struct process_trailer_options *opts,
+		      struct list_head *new_trailer_head,
+		      struct strbuf *input, struct strbuf *out);
 #endif /* TRAILER_H */
-- 
2.52.0