filter: add `git_filter_list__load_ext`

Refactor `git_filter_list__load_with_attr_reader` into
`git_filter_list__load_ext`, which takes a `git_filter_options`.

src/checkout.c

@@ -1416,6 +1416,7 @@ static int blob_content_to_file(
 	int flags = data->opts.file_open_flags;
 	mode_t file_mode = data->opts.file_mode ?
 		data->opts.file_mode : entry_filemode;
+	git_filter_options filter_opts = GIT_FILTER_OPTIONS_INIT;
 	struct checkout_stream writer;
 	mode_t mode;
 	git_filter_list *fl = NULL;
@@ -1438,10 +1439,12 @@ static int blob_content_to_file(
 		return fd;
 	}
 
+	filter_opts.attr_session = &data->attr_session;
+
 	if (!data->opts.disable_filters &&
-		(error = git_filter_list__load_with_attr_session(
-			&fl, data->repo, &data->attr_session, blob, hint_path,
-			GIT_FILTER_TO_WORKTREE, GIT_FILTER_DEFAULT)))
+		(error = git_filter_list__load_ext(
+			&fl, data->repo, blob, hint_path,
+			GIT_FILTER_TO_WORKTREE, &filter_opts)))
 		return error;
 
 	if (fl)
@@ -2003,6 +2006,7 @@ static int checkout_write_merge(
 	git_merge_file_result result = {0};
 	git_filebuf output = GIT_FILEBUF_INIT;
 	git_filter_list *fl = NULL;
+	git_filter_options filter_opts = GIT_FILTER_OPTIONS_INIT;
 	int error = 0;
 
 	if (data->opts.checkout_strategy & GIT_CHECKOUT_CONFLICT_STYLE_DIFF3)
@@ -2052,9 +2056,11 @@ static int checkout_write_merge(
 		in_data.ptr = (char *)result.ptr;
 		in_data.size = result.len;
 
-		if ((error = git_filter_list__load_with_attr_session(
-				&fl, data->repo, &data->attr_session, NULL, git_buf_cstr(&path_workdir),
-				GIT_FILTER_TO_WORKTREE, GIT_FILTER_DEFAULT)) < 0 ||
+		filter_opts.attr_session = &data->attr_session;
+
+		if ((error = git_filter_list__load_ext(
+				&fl, data->repo, NULL, git_buf_cstr(&path_workdir),
+				GIT_FILTER_TO_WORKTREE, &filter_opts)) < 0 ||
 			(error = git_filter_list_apply_to_data(&out_data, fl, &in_data)) < 0)
 			goto done;
 	} else {

src/filter.c

@@ -459,14 +459,13 @@ int git_filter_list_new(
 	return filter_list_new(out, &src);
 }
 
-int git_filter_list__load_with_attr_session(
+int git_filter_list__load_ext(
 	git_filter_list **filters,
 	git_repository *repo,
-	git_attr_session *attr_session,
 	git_blob *blob, /* can be NULL */
 	const char *path,
 	git_filter_mode_t mode,
-	uint32_t flags)
+	git_filter_options *filter_opts)
 {
 	int error = 0;
 	git_filter_list *fl = NULL;
@@ -481,7 +480,8 @@ int git_filter_list__load_with_attr_session(
 	src.repo = repo;
 	src.path = path;
 	src.mode = mode;
-	src.flags = flags;
+	src.flags = filter_opts->flags;
+
 	if (blob)
 		git_oid_cpy(&src.oid, git_blob_id(blob));
 
@@ -494,7 +494,7 @@ int git_filter_list__load_with_attr_session(
 
 		if (fdef->nattrs > 0) {
 			error = filter_list_check_attributes(
-				&values, repo, attr_session, fdef, &src);
+				&values, repo, filter_opts->attr_session, fdef, &src);
 
 			if (error == GIT_ENOTFOUND) {
 				error = 0;
@@ -545,8 +545,12 @@ int git_filter_list_load(
 	git_filter_mode_t mode,
 	uint32_t flags)
 {
-	return git_filter_list__load_with_attr_session(
-		filters, repo, NULL, blob, path, mode, flags);
+	git_filter_options filter_opts = GIT_FILTER_OPTIONS_INIT;
+
+	filter_opts.flags = flags;
+
+	return git_filter_list__load_ext(
+		filters, repo, blob, path, mode, &filter_opts);
 }
 
 void git_filter_list__set_temp_buf(git_filter_list *fl, git_buf *temp_buf)

src/filter.h

@@ -24,19 +24,25 @@ typedef enum {
 	GIT_CRLF_AUTO,
 } git_crlf_t;
 
+typedef struct {
+	git_attr_session *attr_session;
+	uint32_t flags;
+} git_filter_options;
+
+#define GIT_FILTER_OPTIONS_INIT {0}
+
 extern void git_filter_list__set_temp_buf(
 	git_filter_list *fl, git_buf *temp_buf);
 
 extern void git_filter_free(git_filter *filter);
 
-extern int git_filter_list__load_with_attr_session(
+extern int git_filter_list__load_ext(
 	git_filter_list **filters,
 	git_repository *repo,
-	git_attr_session *attr_session,
 	git_blob *blob, /* can be NULL */
 	const char *path,
 	git_filter_mode_t mode,
-	uint32_t flags);
+	git_filter_options *filter_opts);
 
 /*
  * Available filters