Re: [PATCH 09/12] merge-tree: provide a list of which files have conflicts

> From: Elijah Newren <newren@gmail.com>
>
> Callers of `git merge-tree --write-tree` will often want to know which
> files had conflicts.  While they could potentially attempt to parse the
> CONFLICT notices printed, those messages are not meant to be machine
> readable.  Provide a simpler mechanism of just printing the files (in
> the same format as `git ls-files` with quoting, but restricted to
> [...]
> diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
> index 560640ad911..d8eeeb3f306 100644
> --- a/builtin/merge-tree.c
> +++ b/builtin/merge-tree.c
> @@ -11,6 +11,9 @@
>  #include "blob.h"
>  #include "exec-cmd.h"
>  #include "merge-blobs.h"
> +#include "quote.h"
> +
> +static int line_termination = '\n';

>  struct merge_list {
>  	struct merge_list *next;
> @@ -395,7 +398,8 @@ struct merge_tree_options {
>  };
>  
>  static int real_merge(struct merge_tree_options *o,
> -		      const char *branch1, const char *branch2)
> +		      const char *branch1, const char *branch2,
> +		      const char *prefix)
>  {
>  	struct commit *parent1, *parent2;
>  	struct commit_list *common;
> @@ -449,6 +453,22 @@ static int real_merge(struct merge_tree_options *o,
>  		o->show_messages = !result.clean;
>  
>  	printf("%s\n", oid_to_hex(&result.tree->object.oid));
> +	if (!result.clean) {
> +		struct string_list conflicted_files = STRING_LIST_INIT_NODUP;
> +		const char *last = NULL;
> +		int i;
> +
> +		merge_get_conflicted_files(&result, &conflicted_files);
> +		for (i = 0; i < conflicted_files.nr; i++) {
> +			const char *name = conflicted_files.items[i].string;
> +			if (last && !strcmp(last, name))
> +				continue;
> +			write_name_quoted_relative(
> +				name, prefix, stdout, line_termination);