Re: [RFC PATCH 03/13] commit-reach: move commit_contains from ref-filter

> +{
> +	if (filter->with_commit_tag_algo)
> +		return contains_tag_algo(commit, list, cache) == CONTAINS_YES;
> +	return is_descendant_of(commit, list);
> +}
> diff --git a/commit-reach.h b/commit-reach.h
> index 35ec9f0ddb..986fb388d5 100644
> --- a/commit-reach.h
> +++ b/commit-reach.h
> @@ -2,42 +2,24 @@
>  #define __COMMIT_REACH_H__
>  
>  #include "commit.h"
> +#include "commit-slab.h"
> +#include "ref-filter.h"
>  
> -struct commit_list *get_merge_bases_many(struct commit *one,
> -					 int n,
> -					 struct commit **twos);
> -struct commit_list *get_merge_bases_many_dirty(struct commit *one,
> -					       int n,
> -					       struct commit **twos);
> -struct commit_list *get_merge_bases(struct commit *one, struct commit *two);
> -struct commit_list *get_octopus_merge_bases(struct commit_list *in);
> -
> -/* To be used only when object flags after this call no longer matter */
> -struct commit_list *get_merge_bases_many_dirty(struct commit *one, int n, struct commit **twos);
> -
> -int is_descendant_of(struct commit *commit, struct commit_list *with_commit);
> -int in_merge_bases_many(struct commit *commit, int nr_reference, struct commit **reference);
> -int in_merge_bases(struct commit *commit, struct commit *reference);
> -
> +int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid);
>  
>  /*
> - * Takes a list of commits and returns a new list where those
> - * have been removed that can be reached from other commits in
> - * the list. It is useful for, e.g., reducing the commits
> - * randomly thrown at the git-merge command and removing
> - * redundant commits that the user shouldn't have given to it.
> - *
> - * This function destroys the STALE bit of the commit objects'
> - * flags.

> + * Unknown has to be "0" here, because that's the default value for
> + * contains_cache slab entries that have not yet been assigned.
>   */
> -struct commit_list *reduce_heads(struct commit_list *heads);
> +enum contains_result {
> +	CONTAINS_UNKNOWN = 0,
> +	CONTAINS_NO,
> +	CONTAINS_YES
> +};