repo: add new flag --keys to git-repo-info

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.

Signed-off-by: Lucas Seiki Oshiro <lucasseikioshiro@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-repo.adoc b/Documentation/git-repo.adoc
index c4a78277df61c0c48549ab072d37e73b3211a49b..fd0683631cdbf603d04e482bacb6e4e4733f3928 100644 (file)
--- a/Documentation/git-repo.adoc
+++ b/Documentation/git-repo.adoc
@@ -9,6 +9,7 @@ SYNOPSIS
 --------
 [synopsis]
 git repo info [--format=(keyvalue|nul) | -z] [--all | <key>...]
+git repo info --keys [--format=(default|nul) | -z]
 git repo structure [--format=(table|keyvalue|nul) | -z]
 
 DESCRIPTION
@@ -44,6 +45,16 @@ supported:
 +
 `-z` is an alias for `--format=nul`.
 
+`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
        following kinds of information are reported:

diff --git a/builtin/repo.c b/builtin/repo.c
index 1cd12e7eea56199ed1285fd25a031e13e6b51192..48341f9245998387a298faf31ae2838af14867d9 100644 (file)
--- a/builtin/repo.c
+++ b/builtin/repo.c
@@ -16,6 +16,7 @@
 
 static const char *const repo_usage[] = {
        "git repo info [--format=(keyvalue|nul) | -z] [--all | <key>...]",
+       "git repo info --keys [--format=(default|nul) | -z]",
        "git repo structure [--format=(table|keyvalue|nul) | -z]",
        NULL
 };
@@ -147,6 +148,29 @@ static int print_all_fields(struct repository *repo,
        return 0;
 }
 
+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];
+               printf("%s%c", field->key, sep);
+       }
+
+       return 0;
+}
+
 static int parse_format_cb(const struct option *opt,
                           const char *arg, int unset UNUSED)
 {
@@ -173,6 +197,7 @@ static int cmd_repo_info(int argc, const char **argv, const char *prefix,
 {
        enum output_format format = FORMAT_DEFAULT;
        int all_keys = 0;
+       int show_keys = 0;
        struct option options[] = {
                OPT_CALLBACK_F(0, "format", &format, N_("format"),
                               N_("output format"),
@@ -182,11 +207,18 @@ static int cmd_repo_info(int argc, const char **argv, const char *prefix,
                               PARSE_OPT_NONEG | PARSE_OPT_NOARG,
                               parse_format_cb),
                OPT_BOOL(0, "all", &all_keys, N_("print all keys/values")),
+               OPT_BOOL(0, "keys", &show_keys, N_("show keys")),
                OPT_END()
        };
 
        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(format);
+
        if (format == FORMAT_DEFAULT)
                format = FORMAT_KEYVALUE;
 

diff --git a/t/t1900-repo.sh b/t/t1900-repo.sh
index 51d55f11a5ed664bc5927b12677f56ad76f32070..e8802413a65c229c7e55fae2828ff3f18a4c80e1 100755 (executable)
--- a/t/t1900-repo.sh
+++ b/t/t1900-repo.sh
@@ -4,15 +4,6 @@ test_description='test git repo-info'
 
 . ./test-lib.sh
 
-# git-repo-info keys. It must contain the same keys listed in the const
-# repo_info_fields, in lexicographical order.
-REPO_INFO_KEYS='
-       layout.bare
-       layout.shallow
-       object.format
-       references.format
-'
-
 # Test whether a key-value pair is correctly returned
 #
 # Usage: test_repo_info <label> <init command> <repo_name> <key> <expected value>
@@ -119,8 +110,8 @@ test_expect_success 'git repo info uses the last requested format' '
        test_cmp expected actual
 '
 
-test_expect_success 'git repo info --all returns all key-value pairs' '
-       git repo info $REPO_INFO_KEYS >expect &&
+test_expect_success 'git repo info --all and git repo info $(git repo info --keys) output the same data' '
+       git repo info $(git repo info --keys) >expect &&
        git repo info --all >actual &&
        test_cmp expect actual
 '
@@ -131,4 +122,24 @@ 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