#include "git-compat-util.h"
#include "repack.h"
#include "repository.h"
#include "run-command.h"
#include "string-list.h"

int write_filtered_pack(struct write_pack_opts *opts,
			struct existing_packs *existing,
			struct string_list *names)
{
	struct child_process cmd = CHILD_PROCESS_INIT;
	struct string_list_item *item;
	FILE *in;
	int ret;
	const char *caret;
	const char *pack_prefix = write_pack_opts_pack_prefix(opts);

	prepare_pack_objects(&cmd, opts->po_args, opts->destination);

	strvec_push(&cmd.args, "--stdin-packs");

	for_each_string_list_item(item, &existing->kept_packs)
		strvec_pushf(&cmd.args, "--keep-pack=%s", item->string);

	cmd.in = -1;

	ret = start_command(&cmd);
	if (ret)
		return ret;

	/*
	 * Here 'names' contains only the pack(s) that were just
	 * written, which is exactly the packs we want to keep. Also
	 * 'existing_kept_packs' already contains the packs in
	 * 'keep_pack_list'.
	 */
	in = xfdopen(cmd.in, "w");
	for_each_string_list_item(item, names)
		fprintf(in, "^%s-%s.pack\n", pack_prefix, item->string);
	for_each_string_list_item(item, &existing->non_kept_packs)
		fprintf(in, "%s.pack\n", item->string);
	for_each_string_list_item(item, &existing->cruft_packs)
		fprintf(in, "%s.pack\n", item->string);
	caret = opts->po_args->pack_kept_objects ? "" : "^";
	for_each_string_list_item(item, &existing->kept_packs)
		fprintf(in, "%s%s.pack\n", caret, item->string);
	fclose(in);

	return finish_pack_objects_cmd(existing->repo->hash_algo, opts, &cmd,
				       names);
}