From f2f6059a3ea783a4638d695a121f6b3e293d734c Mon Sep 17 00:00:00 2001
From: ydah <13041216+ydah@users.noreply.github.com>
Date: Sun, 15 Oct 2023 23:14:25 +0900
Subject: [PATCH] Add description of STDIN mode to help command

---
 lib/lrama/option_parser.rb       | 3 +++
 spec/lrama/option_parser_spec.rb | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/lib/lrama/option_parser.rb b/lib/lrama/option_parser.rb
index d8ed62ee..35725fc6 100644
--- a/lib/lrama/option_parser.rb
+++ b/lib/lrama/option_parser.rb
@@ -52,6 +52,9 @@ def parse_by_option_parser(argv)
           Usage: lrama [options] FILE
         BANNER
         o.separator ''
+        o.separator 'STDIN mode:'
+        o.separator 'lrama [options] - FILE               read grammar from STDIN'
+        o.separator ''
         o.separator 'Tuning the Parser:'
         o.on('-S', '--skeleton=FILE', 'specify the skeleton to use') {|v| @options.skeleton = v }
         o.on('-t', 'reserved, do nothing') { }
diff --git a/spec/lrama/option_parser_spec.rb b/spec/lrama/option_parser_spec.rb
index 06432fdf..fa8fb158 100644
--- a/spec/lrama/option_parser_spec.rb
+++ b/spec/lrama/option_parser_spec.rb
@@ -20,6 +20,9 @@
 
         Usage: lrama [options] FILE
 
+        STDIN mode:
+        lrama [options] - FILE               read grammar from STDIN
+
         Tuning the Parser:
             -S, --skeleton=FILE              specify the skeleton to use
             -t                               reserved, do nothing