1 files changed, 21 insertions, 0 deletions
diff --git a/lib/rubygems/unknown_command_spell_checker.rb b/lib/rubygems/unknown_command_spell_checker.rb
new file mode 100644
index 0000000000..ee5c2fbe04
--- /dev/null
+++ b/lib/rubygems/unknown_command_spell_checker.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class Gem::UnknownCommandSpellChecker
+  attr_reader :error
+
+  def initialize(error)
+    @error = error
+  end
+
+  def corrections
+    @corrections ||=
+      spell_checker.correct(error.unknown_command).map(&:inspect)
+  end
+
+  private
+
+  def spell_checker
+    dictionary = Gem::CommandManager.instance.command_names
+    DidYouMean::SpellChecker.new(dictionary: dictionary)
+  end
+end