Re: [PATCH 3/4] builtin/repo: add keyvalue format for stats

> diff --git a/Documentation/git-repo.adoc b/Documentation/git-repo.adoc
> index 2a67abfca8..7d0341e4f1 100644
> --- a/Documentation/git-repo.adoc
> +++ b/Documentation/git-repo.adoc
> @@ -9,7 +9,7 @@ SYNOPSIS
>  --------
>  [synopsis]
>  git repo info [--format=(keyvalue|nul)] [-z] [<key>...]
> -git repo stats
> +git repo stats [--format=(table|keyvalue)]
>
>  DESCRIPTION
>  -----------
> @@ -44,12 +44,22 @@ supported:
>  +
>  `-z` is an alias for `--format=nul`.
>
> -stats::
> +`stats [--format=(table|keyvalue)]`::
>  	Retrieve stats about the current repository. All references and
>  	reachable objects in the repository are categorized and counted
>  	accordingly.
>  +
> -The table output format may change and is not intended for machine parsing.
> +The output format can be chosen through the flag `--format`. Two formats are
> +supported:
> ++
> +`table`:::
> +	Outputs repository stats in a human-friendly table and is used by
> +	default. This format may change and is not intended for machine
> +	parsing.
> +
> +`keyvalue`:::
> +	Each line of output contains a key-value pair of a repostiory stat. The

> +static void stats_print(struct stats *stats)
> +{
> +	struct strbuf buf = STRBUF_INIT;
> +
> +	strbuf_addf(&buf, "references.branches.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->refs.branches);
> +	strbuf_addf(&buf, "references.tags.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->refs.tags);
> +	strbuf_addf(&buf, "references.remotes.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->refs.remotes);
> +	strbuf_addf(&buf, "references.others.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->refs.others);
> +
> +	strbuf_addf(&buf, "objects.commits.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->objects.commits);
> +	strbuf_addf(&buf, "objects.trees.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->objects.trees);
> +	strbuf_addf(&buf, "objects.blobs.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->objects.blobs);
> +	strbuf_addf(&buf, "objects.tags.count=%" PRIuMAX "\n",
> +		    (uintmax_t)stats->objects.tags);
> +
> +	fwrite(buf.buf, sizeof(char), buf.len, stdout);
> +	strbuf_release(&buf);
> +}
> +

>  static void stats_count_references(struct ref_stats *stats, struct ref_array *refs)
>  {
>  	for (int i = 0; i < refs->nr; i++) {
> @@ -359,9 +390,16 @@ static void stats_count_objects(struct object_stats *stats,
>  	path_walk_info_clear(&info);
>  }
>
> -static int repo_stats(int argc UNUSED, const char **argv UNUSED,
> -		      const char *prefix, struct repository *repo)
> +static int repo_stats(int argc, const char **argv, const char *prefix,
> +		      struct repository *repo)
>  {
> +	enum output_format format = FORMAT_TABLE;
> +	struct option options[] = {
> +		OPT_CALLBACK_F(0, "format", &format, N_("format"),
> +			       N_("output format"),
> +			       PARSE_OPT_NONEG, parse_format_cb),
> +		OPT_END()
> +	};
>  	struct ref_filter filter = REF_FILTER_INIT;
>  	struct strvec ref_patterns = STRVEC_INIT;
>  	struct stats_table table = { 0 };
> @@ -369,6 +407,10 @@ static int repo_stats(int argc UNUSED, const char **argv UNUSED,
>  	struct stats stats = { 0 };
>  	struct rev_info revs;
>
> +	parse_options(argc, argv, prefix, options, repo_usage, 0);
> +	if (format == FORMAT_NUL_TERMINATED)
> +		die(_("nul format not yet supported"));
> +