Re: [GSoC PATCH v5 5/5] repo: add the --format flag

[Patrick Steinhardt <ps@pks.im>]

On Mon, Jul 21, 2025 at 09:28:35PM -0300, Lucas Seiki Oshiro wrote:
> diff --git a/Documentation/git-repo.adoc b/Documentation/git-repo.adoc
> index 375b956d3f..5bdc3831a7 100644
> --- a/Documentation/git-repo.adoc
> +++ b/Documentation/git-repo.adoc
> @@ -18,10 +18,21 @@ THIS COMMAND IS EXPERIMENTAL. THE BEHAVIOR MAY CHANGE.
>  
>  COMMANDS
>  --------
> -info [<key>...]::
> +info [--format=<format>] [<key>...]::
>  	Retrieve metadata-related information about the current repository. Only
>  	the requested data will be returned based on their keys (see "INFO KEYS"
>  	section below).
> ++
> +The output format can be chosen through the flag `--format`. Two formats are
> +supported:
> ++
> +* `keyvalue`: output key-value pairs one per line using the `=` character as
> +the delimiter between the key and the value. This is the default.
> +
> +* `null`: similar to `keyvalue`, but using a newline character as the delimiter

Our manual typically says "NUL"-terminated format in other places, like
for example in git-update-ref(1). So let's rather name the format `nul`.

> diff --git a/builtin/repo.c b/builtin/repo.c
> index 490fa9dd49..10d02bb3ea 100644
> --- a/builtin/repo.c
> +++ b/builtin/repo.c
> @@ -8,6 +8,11 @@
>  
>  typedef const char *get_value_fn(struct repository *repo);
>  
> +enum output_format {
> +	FORMAT_KEYVALUE,
> +	FORMAT_NULL_TERMINATED,

Likewise, this should be `FORMAT_NUL_TERMINATED`.

> @@ -61,9 +66,24 @@ static int qsort_strcmp(const void *va, const void *vb)
>  	return strcmp(a, b);
>  }
>  
> -static int print_fields(int argc, const char **argv, struct repository *repo)
> +static int print_fields(int argc, const char **argv,
> +			struct repository *repo,
> +			enum output_format format)
>  {
>  	const char *last = "";
> +	char kv_sep;
> +	char field_sep;
> +
> +	switch (format) {
> +	case FORMAT_KEYVALUE:
> +		kv_sep = '=';
> +		field_sep = '\n';
> +		break;
> +	case FORMAT_NULL_TERMINATED:
> +		kv_sep = '\n';
> +		field_sep = '\0';
> +		break;
> +	}
>  
>  	QSORT(argv, argc, qsort_strcmp);
>  

Makes sense.

> @@ -81,17 +101,38 @@ static int print_fields(int argc, const char **argv, struct repository *repo)
>  			return error("key %s not found", key);
>  
>  		value = callback(repo);
> -		printf("%s=%s\n", key, value);
> +		printf("%s%c%s%c", key, kv_sep, value, field_sep);
>  		last = key;

This here is where we can introduce the quoting. Something like:

	if (format == FORMAT_KEYVALUE) {
		strbuf_reset(&quoted_value);
		quote_c_style(value, &quoted_value, NULL, 0);
	}

	printf("%s%c%s%c", key, kv_sep,
	       format == FORMAT_KEYVALUE ? quoted_value.buf : value,
	       field_sep);

>  	}
>  
>  	return 0;
>  }
>  
> -static int repo_info(int argc, const char **argv, const char *prefix UNUSED,
> +static int repo_info(int argc, const char **argv, const char *prefix,
>  		     struct repository *repo)
>  {
> -	return print_fields(argc - 1, argv + 1, repo);
> +	const char *format_str = "keyvalue";
> +	enum output_format format;
> +	const char *const repo_info_usage[] = {
> +		"git repo info [<key>...]",
> +		NULL
> +	};
> +	struct option options[] = {
> +		OPT_STRING(0, "format", &format_str, N_("format"),
> +			   N_("output format")),
> +		OPT_END()
> +	};
> +
> +	argc = parse_options(argc, argv, prefix, options, repo_info_usage, 0);
> +
> +	if (!strcmp(format_str, "keyvalue"))
> +		format = FORMAT_KEYVALUE;
> +	else if (!strcmp(format_str, "null"))
> +		format = FORMAT_NULL_TERMINATED;
> +	else
> +		die("invalid format %s", format_str);

Nit: this should be translated and quote the format string:

	die(_("invalid format: '%s'"), format_str);

Patrick