Re: [PATCH v2 14/20] merge-ort: step 2 of tree writing -- function to create tree object

> +static void write_tree(struct object_id *result_oid,
> +		       struct string_list *versions,
> +		       unsigned int offset)
> +{
> +	size_t maxlen = 0;
> +	unsigned int nr = versions->nr - offset;
> +	struct strbuf buf = STRBUF_INIT;
> +	struct string_list relevant_entries = STRING_LIST_INIT_NODUP;
> +	int i;
> +
> +	/*
> +	 * We want to sort the last (versions->nr-offset) entries in versions.
> +	 * Do so by abusing the string_list API a bit: make another string_list
> +	 * that contains just those entries and then sort them.
> +	 *
> +	 * We won't use relevant_entries again and will let it just pop off the
> +	 * stack, so there won't be allocation worries or anything.
> +	 */
> +	relevant_entries.items = versions->items + offset;
> +	relevant_entries.nr = versions->nr - offset;
> +	string_list_sort(&relevant_entries);
> +
> +	/* Pre-allocate some space in buf */
> +	for (i = 0; i < nr; i++) {
> +		maxlen += strlen(versions->items[offset+i].string) + 34;