From f02f035d0127a8c6f9eba5af24dcdc4c22844624 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADt=20Ondruch?= <vondruch@redhat.com>
Date: Thu, 4 Aug 2022 13:05:00 +0200
Subject: [PATCH] Use introspection to detect usage of kwargs/positional args.

This avoids checking of Ruby version, which is almost never the right
thing.
---
 lib/gem2rpm.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/gem2rpm.rb b/lib/gem2rpm.rb
index 824f5bf..5f20a31 100644
--- a/lib/gem2rpm.rb
+++ b/lib/gem2rpm.rb
@@ -90,7 +90,10 @@ def self.convert(fname, template, out = $stdout, nongem = true, local = false,
       end
     end
 
-    erb = if RUBY_VERSION >= '2.6'
+    # Check if keyword arguments are used. The condition could let go as soon
+    # as only Ruby 2.6+ is supported.
+    kwargs = !(ERB.new("").method(:initialize).parameters & [[:key, :trim_mode]]).empty?
+    erb = if kwargs
             ERB.new(template.read, trim_mode: '-')
           else
             ERB.new(template.read, 0, '-')