From 5f8f618dc8e16bfaeb840f08daa29714f1746309 Mon Sep 17 00:00:00 2001
From: Stan Lo <stan001212@gmail.com>
Date: Sun, 12 Apr 2026 11:59:24 +0100
Subject: [PATCH] Add --nobanner option to suppress startup banner

Closes https://github.com/ruby/irb/issues/1196
---
 lib/irb/init.rb       | 2 ++
 test/irb/test_init.rb | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/lib/irb/init.rb b/lib/irb/init.rb
index 365f445da..f933f5cec 100644
--- a/lib/irb/init.rb
+++ b/lib/irb/init.rb
@@ -346,6 +346,8 @@ def IRB.parse_opts(argv: ::ARGV)
         opt = $1 || argv.shift
         prompt_mode = opt.upcase.tr("-", "_").intern
         @CONF[:PROMPT_MODE] = prompt_mode
+      when "--nobanner"
+        @CONF[:SHOW_BANNER] = false
       when "--noprompt"
         @CONF[:PROMPT_MODE] = :NULL
       when "--script"
diff --git a/test/irb/test_init.rb b/test/irb/test_init.rb
index 66e4dfb62..b68681e38 100644
--- a/test/irb/test_init.rb
+++ b/test/irb/test_init.rb
@@ -285,6 +285,11 @@ def test_option_tracer
       assert_equal(true, IRB.conf[:USE_TRACER])
     end
 
+    def test_nobanner
+      IRB.setup(eval("__FILE__"), argv: %w[--nobanner])
+      assert_equal(false, IRB.conf[:SHOW_BANNER])
+    end
+
     private
 
     def with_argv(argv)