[PATCH v2 0/2] repo: add new flag --keys to git-repo-info

Hi!

This patch series adds a new flag --keys to git-repo-info. This new flag only prints the available keys, without printing the corresponding values.

The main change in this version is the compatibility with the flags -z and --format, allowing the keys to be printed following the null-terminated format.

This patch is based on top of master bdc5341ff6 (The sixth batch, 2025-12-05) with lo/repo-struct-z merged.

Lucas Seiki Oshiro (2):
  repo: add a default output format to enum output_format
  repo: add new flag --keys to git-repo-info

 Documentation/git-repo.adoc | 11 ++++++++++
 builtin/repo.c              | 41 ++++++++++++++++++++++++++++++++++++-
 t/t1900-repo.sh             | 33 +++++++++++++++++++----------
 3 files changed, 73 insertions(+), 12 deletions(-)

Range-diff against v1:
-:  ---------- > 1:  9eb2549806 repo: add a default output format to enum output_format
1:  1b9b7dceb7 ! 2:  c5b7ba8824 repo: add new flag --keys to git-repo-info
    @@ Metadata
      ## Commit message ##
         repo: add new flag --keys to git-repo-info
     
    -    Currently, if the user wants to find what are the available keys,
    -    they need to either check the documentation or to ask to all the
    -    key-value pairs by using --all.
    +    If the user wants to find what are the available keys, they need to
    +    either check the documentation or to ask for all the key-value pairs
    +    by using --all.
     
         Add a new flag --keys for listing only the available keys without
         listing the values.
    @@ Documentation/git-repo.adoc: SYNOPSIS
      --------
      [synopsis]
      git repo info [--format=(keyvalue|nul) | -z] [--all | <key>...]
    -+git repo info --keys
    ++git repo info --keys [--format=(default|nul) | -z]
      git repo structure [--format=(table|keyvalue|nul) | -z]
      
      DESCRIPTION
    @@ Documentation/git-repo.adoc: supported:
      +
      `-z` is an alias for `--format=nul`.
      
    -+`info --keys`::
    -+List all the available keys, one per line.
    ++`info --keys [--format=(default|nul) | -z]`::
    ++	List all the available keys, one per line. The output format can be chosen
    ++	through the flag `--format`. The following formats are supported:
    +++
    ++`default`:::
    ++	output the keys one per line.
    ++
    ++`nul`:::
    ++	similar to `default`, but using a NUL character after each value.
     +
      `structure [--format=(table|keyvalue|nul) | -z]`::
      	Retrieve statistics about the current repository structure. The
    @@ builtin/repo.c
      
      static const char *const repo_usage[] = {
      	"git repo info [--format=(keyvalue|nul) | -z] [--all | <key>...]",
    -+	"git repo info --keys",
    ++	"git repo info --keys [--format=(default|nul) | -z]",
      	"git repo structure [--format=(table|keyvalue|nul) | -z]",
      	NULL
      };
    @@ builtin/repo.c: static int print_all_fields(struct repository *repo,
      	return 0;
      }
      
    -+static int print_keys(void)
    ++static int print_keys(enum output_format format)
     +{
    ++	char sep;
    ++
    ++	switch (format) {
    ++	case FORMAT_DEFAULT:
    ++		sep = '\n';
    ++		break;
    ++	case FORMAT_NUL_TERMINATED:
    ++		sep = '\0';
    ++		break;
    ++	default:
    ++		die(_("--keys can only be used with --format=default or --format=nul"));
    ++	}
    ++
     +	for (size_t i = 0; i < ARRAY_SIZE(repo_info_fields); i++) {
     +		const struct field *field = &repo_info_fields[i];
    -+		puts(field->key);
    ++		printf("%s%c", field->key, sep);
     +	}
     +
     +	return 0;
    @@ builtin/repo.c: static int print_all_fields(struct repository *repo,
      {
     @@ builtin/repo.c: static int cmd_repo_info(int argc, const char **argv, const char *prefix,
      {
    - 	enum output_format format = FORMAT_KEYVALUE;
    + 	enum output_format format = FORMAT_DEFAULT;
      	int all_keys = 0;
     +	int show_keys = 0;
      	struct option options[] = {
    @@ builtin/repo.c: static int cmd_repo_info(int argc, const char **argv, const char
      	};
      
      	argc = parse_options(argc, argv, prefix, options, repo_usage, 0);
    + 
    ++	if (show_keys && (all_keys || argc))
    ++		die(_("--keys cannot be used with a <key> or --all"));
     +
     +	if (show_keys)
    -+		return print_keys();
    ++		return print_keys(format);
     +
    - 	if (format != FORMAT_KEYVALUE && format != FORMAT_NUL_TERMINATED)
    - 		die(_("unsupported output format"));
    + 	if (format == FORMAT_DEFAULT)
    + 		format = FORMAT_KEYVALUE;
      
     
      ## t/t1900-repo.sh ##
    @@ t/t1900-repo.sh: test_expect_success 'git repo info uses the last requested form
      	git repo info --all >actual &&
      	test_cmp expect actual
      '
    +@@ t/t1900-repo.sh: test_expect_success 'git repo info --all <key> aborts' '
    + 	test_cmp expect actual
    + '
    + 
    ++test_expect_success 'git repo info --keys --format=nul uses nul-terminated output' '
    ++	git repo info --keys --format=default >default &&
    ++	lf_to_nul <default > expect &&
    ++	git repo info --keys --format=nul >actual &&
    ++	test_cmp expect actual
    ++'
    ++
    ++test_expect_success 'git repo info --keys aborts when using --format other than default or nul' '
    ++	echo "fatal: --keys can only be used with --format=default or --format=nul" >expect &&
    ++	test_must_fail git repo info --keys --format=keyvalue 2>actual &&
    ++	test_cmp expect actual
    ++'
    ++
    ++test_expect_success 'git repo info --keys aborts when requesting keys' '
    ++	echo "fatal: --keys cannot be used with a <key> or --all" >expect &&
    ++	test_must_fail git repo info --keys --all 2>actual_all &&
    ++	test_must_fail git repo info --keys some.key 2>actual_key &&
    ++	test_cmp expect actual_all &&
    ++	test_cmp expect actual_key
    ++'
    + test_done