Re: [PATCH 2/3] merge-recursive: add ability to turn off directory rename detection

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

Hi Elijah,

On Wed, 29 Aug 2018, Elijah Newren wrote:

> Signed-off-by: Elijah Newren <newren@gmail.com>
> ---
>  merge-recursive.c | 18 +++++++++++++-----
>  merge-recursive.h |  1 +
>  2 files changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/merge-recursive.c b/merge-recursive.c
> index f110e1c5ec..bf3cb03d3a 100644
> --- a/merge-recursive.c
> +++ b/merge-recursive.c
> @@ -2843,12 +2843,19 @@ static int handle_renames(struct merge_options *o,
>  	head_pairs = get_diffpairs(o, common, head);
>  	merge_pairs = get_diffpairs(o, common, merge);
>  
> -	dir_re_head = get_directory_renames(head_pairs, head);
> -	dir_re_merge = get_directory_renames(merge_pairs, merge);
> +	if (o->detect_directory_renames) {
> +		dir_re_head = get_directory_renames(head_pairs, head);
> +		dir_re_merge = get_directory_renames(merge_pairs, merge);
>  
> -	handle_directory_level_conflicts(o,
> -					 dir_re_head, head,
> -					 dir_re_merge, merge);
> +		handle_directory_level_conflicts(o,
> +						 dir_re_head, head,
> +						 dir_re_merge, merge);
> +	} else {
> +		dir_re_head  = xmalloc(sizeof(*dir_re_head));
> +		dir_re_merge = xmalloc(sizeof(*dir_re_merge));

This is not a suggestion to change anything, but a genuine question out of
curiosity: would it make sense to put the `dir_re_head` and `dir_re_merge`
structures into `struct merge_options` to avoid these extra `malloc()`s?
Or would that cause issues with the recursive nature of the recursive
merge?

Ciao,
Dscho

> +		dir_rename_init(dir_re_head);
> +		dir_rename_init(dir_re_merge);
> +	}
>  
>  	ri->head_renames  = get_renames(o, head_pairs,
>  					dir_re_merge, dir_re_head, head,
> @@ -3541,6 +3548,7 @@ void init_merge_options(struct merge_options *o)
>  	o->renormalize = 0;
>  	o->diff_detect_rename = -1;
>  	o->merge_detect_rename = -1;
> +	o->detect_directory_renames = 1;
>  	merge_recursive_config(o);
>  	merge_verbosity = getenv("GIT_MERGE_VERBOSITY");
>  	if (merge_verbosity)
> diff --git a/merge-recursive.h b/merge-recursive.h
> index fa7bc6b683..e39ee5d78b 100644
> --- a/merge-recursive.h
> +++ b/merge-recursive.h
> @@ -18,6 +18,7 @@ struct merge_options {
>  	unsigned renormalize : 1;
>  	long xdl_opts;
>  	int verbosity;
> +	int detect_directory_renames;
>  	int diff_detect_rename;
>  	int merge_detect_rename;
>  	int diff_rename_limit;
> -- 
> 2.18.0.12.g97a29da30a
> 
>