btrfs-progs: print compact help for btrfs

Running 'btrfs' without arguments will print complete help that spans
a lot of lines and is really helpful. Print only subcommand group
names with short descriptions, similar to what 'git' does.

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/commands.h b/commands.h
index bd23340d..f9733719 100644
--- a/commands.h
+++ b/commands.h
@@ -72,6 +72,7 @@ extern const char * const generic_cmd_help_usage[];
 void usage(const char * const *usagestr) __attribute__((noreturn));
 void usage_command(const struct cmd_struct *cmd, int full, int err);
 void usage_command_group(const struct cmd_group *grp, int all, int err);
+void usage_command_group_short(const struct cmd_group *grp);
 
 void help_unknown_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));
 void help_ambiguous_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));