Re: [PATCH v8 3/5] Export rewrite_parents() for 'log -L'

> From: Bo Yang <struggleyb.nku@gmail.com>
>
> The function rewrite_one is used to rewrite a single
> parent of the current commit, and is used by rewrite_parents
> to rewrite all the parents.
>
> Decouple the dependence between them by making rewrite_one
> a callback function that is passed to rewrite_parents. Then
> export rewrite_parents for reuse by the line history browser.
>
> We will use this function in line.c.

> Signed-off-by: Bo Yang <struggleyb.nku@gmail.com>
> Signed-off-by: Thomas Rast <trast@student.ethz.ch>
> ---
>  revision.c | 13 ++++---------
>  revision.h | 10 ++++++++++
>  2 files changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/revision.c b/revision.c
> index ef60205..46319d5 100644
> --- a/revision.c
> +++ b/revision.c
> @@ -2173,12 +2173,6 @@ int prepare_revision_walk(struct rev_info *revs)
>  	return 0;
>  }
>  
> -enum rewrite_result {
> -	rewrite_one_ok,
> -	rewrite_one_noparents,
> -	rewrite_one_error
> -};
> -
>  static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
>  {
>  	struct commit_list *cache = NULL;
> @@ -2200,12 +2194,13 @@ static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp
>  	}
>  }
>  
> -static int rewrite_parents(struct rev_info *revs, struct commit *commit)
> +int rewrite_parents(struct rev_info *revs, struct commit *commit,
> +	rewrite_parent_fn_t rewrite_parent)
>  {
>  	struct commit_list **pp = &commit->parents;
>  	while (*pp) {
>  		struct commit_list *parent = *pp;
> -		switch (rewrite_one(revs, &parent->item)) {
> +		switch (rewrite_parent(revs, &parent->item)) {
>  		case rewrite_one_ok:
>  			break;
>  		case rewrite_one_noparents:
> @@ -2371,7 +2366,7 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
>  	if (action == commit_show &&
>  	    !revs->show_all &&
>  	    revs->prune && revs->dense && want_ancestry(revs)) {
> -		if (rewrite_parents(revs, commit) < 0)
> +		if (rewrite_parents(revs, commit, rewrite_one) < 0)
>  			return commit_error;
>  	}
>  	return action;
> diff --git a/revision.h b/revision.h
> index 5da09ee..640110d 100644
> --- a/revision.h
> +++ b/revision.h
> @@ -241,4 +241,14 @@ enum commit_action {
>  extern enum commit_action get_commit_action(struct rev_info *revs, struct commit *commit);
>  extern enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit);
>  
> +enum rewrite_result {
> +	rewrite_one_ok,
> +	rewrite_one_noparents,
> +	rewrite_one_error
> +};
> +
> +typedef enum rewrite_result (*rewrite_parent_fn_t)(struct rev_info *revs, struct commit **pp);
> +
> +extern int rewrite_parents(struct rev_info *revs, struct commit *commit,
> +	rewrite_parent_fn_t rewrite_parent);
>  #endif