From b48553ca392d056bdc45070b33c0dca327e1e0be Mon Sep 17 00:00:00 2001
From: komi1230 <ykominami@hey.jp>
Date: Tue, 12 Oct 2021 16:43:02 +0900
Subject: [PATCH] Show help if without any subcommand

---
 src/main.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 5bb6f44..4c9a4e6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 use atty::Stream;
 use base64::decode as base64_decode;
 use chrono::{TimeZone, Utc};
-use clap::{arg_enum, crate_authors, crate_version, App, Arg, ArgMatches, SubCommand};
+use clap::{arg_enum, crate_authors, crate_version, App, AppSettings, Arg, ArgMatches, SubCommand};
 use jsonwebtoken::errors::{ErrorKind, Result as JWTResult};
 use jsonwebtoken::{
     dangerous_insecure_decode, decode, encode, Algorithm, DecodingKey, EncodingKey, Header,
@@ -156,6 +156,7 @@ fn config_options<'a, 'b>() -> App<'a, 'b> {
         .about("Encode and decode JWTs from the command line. RSA and ECDSA encryption currently only supports keys in DER format")
         .version(crate_version!())
         .author(crate_authors!())
+        .setting(AppSettings::ArgRequiredElseHelp)
         .subcommand(
             SubCommand::with_name("encode")
                 .about("Encode new JWTs")