brew style

Library/Homebrew/test/utils_spec.rb

@@ -62,7 +62,8 @@ describe Utils do
   describe ".underscore" do
     # commented out entries require acronyms inflections
     let(:words) {
-      [["API", "api"],
+      [
+        ["API", "api"],
         ["APIController", "api_controller"],
         ["Nokogiri::HTML", "nokogiri/html"],
         # ["HTTPAPI", "http_api"],
@@ -83,7 +84,8 @@ describe Utils do
         ["HttpsApis", "https_apis"],
         ["Html5", "html5"],
         ["Restfully", "restfully"],
-      ["RoRails", "ro_rails"]]
+        ["RoRails", "ro_rails"],
+      ]
     }
 
     it "converts strings to underscore case" do

Library/Homebrew/utils.rb

@@ -144,8 +144,11 @@ module Utils
   sig { params(camel_cased_word: T.any(String, Symbol)).returns(String) }
   def self.underscore(camel_cased_word)
     return camel_cased_word unless /[A-Z-]|::/.match?(camel_cased_word)
+
     word = camel_cased_word.to_s.gsub("::", "/")
-    word.gsub!(/([A-Z])(?=[A-Z][a-z])|([a-z\d])(?=[A-Z])/) { ($1 || $2) << "_" }
+    word.gsub!(/([A-Z])(?=[A-Z][a-z])|([a-z\d])(?=[A-Z])/) do
+      (::Regexp.last_match(1) || ::Regexp.last_match(2)) << "_"
+    end
     word.tr!("-", "_")
     word.downcase!
     word