Remove ActiveSupport String inflections

Library/Homebrew/extend/kernel.rb

@@ -199,13 +199,13 @@ def pretty_duration(s)
     if s > 59
       m = s / 60
       s %= 60
-      res = +"#{m} #{"minute".pluralize(m)}"
+      res = +"#{m} #{Utils.pluralize("minute", m)}"
       return res.freeze if s.zero?
 
       res << " "
     end
 
-    res << "#{s} #{"second".pluralize(s)}"
+    res << "#{s} #{Utils.pluralize("second", s)}"
     res.freeze
   end
 

Library/Homebrew/global.rb

@@ -16,7 +16,8 @@
 require "active_support/core_ext/string/filters"
 require "active_support/core_ext/object/try"
 require "active_support/core_ext/array/access"
-require "active_support/core_ext/string/inflections"
+require "i18n"
+require "active_support/core_ext/hash/except"
 require "active_support/core_ext/kernel/reporting"
 require "active_support/core_ext/hash/keys"
 require "active_support/core_ext/hash/deep_merge"
@@ -28,12 +29,6 @@
 I18n.backend.available_locales # Initialize locales so they can be overwritten.
 I18n.backend.store_translations :en, support: { array: { last_word_connector: " and " } }
 
-ActiveSupport::Inflector.inflections(:en) do |inflect|
-  inflect.irregular "formula", "formulae"
-  inflect.irregular "is", "are"
-  inflect.irregular "it", "they"
-end
-
 HOMEBREW_API_DEFAULT_DOMAIN = ENV.fetch("HOMEBREW_API_DEFAULT_DOMAIN").freeze
 HOMEBREW_BOTTLE_DEFAULT_DOMAIN = ENV.fetch("HOMEBREW_BOTTLE_DEFAULT_DOMAIN").freeze
 HOMEBREW_BREW_DEFAULT_GIT_REMOTE = ENV.fetch("HOMEBREW_BREW_DEFAULT_GIT_REMOTE").freeze

Library/Homebrew/livecheck/strategy.rb

@@ -111,7 +111,7 @@ def strategies
           constant = Strategy.const_get(const_symbol)
           next unless constant.is_a?(Class)
 
-          key = const_symbol.to_s.underscore.to_sym
+          key = Utils.underscore(const_symbol).to_sym
           @strategies[key] = constant
         end
         @strategies

Library/Homebrew/test/utils_spec.rb

@@ -58,4 +58,41 @@
       expect(described_class.pluralize("foo", 2, singular: "o", plural: "es")).to eq("fooes")
     end
   end
+
+  describe ".underscore" do
+    # commented out entries require acronyms inflections
+    let(:words) {
+      [
+        ["API", "api"],
+        ["APIController", "api_controller"],
+        ["Nokogiri::HTML", "nokogiri/html"],
+        # ["HTTPAPI", "http_api"],
+        ["HTTP::Get", "http/get"],
+        ["SSLError", "ssl_error"],
+        # ["RESTful", "restful"],
+        # ["RESTfulController", "restful_controller"],
+        # ["Nested::RESTful", "nested/restful"],
+        # ["IHeartW3C", "i_heart_w3c"],
+        # ["PhDRequired", "phd_required"],
+        # ["IRoRU", "i_ror_u"],
+        # ["RESTfulHTTPAPI", "restful_http_api"],
+        # ["HTTP::RESTful", "http/restful"],
+        # ["HTTP::RESTfulAPI", "http/restful_api"],
+        # ["APIRESTful", "api_restful"],
+        ["Capistrano", "capistrano"],
+        ["CapiController", "capi_controller"],
+        ["HttpsApis", "https_apis"],
+        ["Html5", "html5"],
+        ["Restfully", "restfully"],
+        ["RoRails", "ro_rails"],
+      ]
+    }
+
+    it "converts strings to underscore case" do
+      words.each do |camel, under|
+        expect(described_class.underscore(camel)).to eq(under)
+        expect(described_class.underscore(under)).to eq(under)
+      end
+    end
+  end
 end

Library/Homebrew/utils.rb

@@ -131,4 +131,26 @@ def self.pluralize(stem, count, plural: "s", singular: "")
     suffix = (count == 1) ? singular : plural
     "#{stem}#{suffix}"
   end
+
+  # Makes an underscored, lowercase form from the expression in the string.
+  #
+  # Changes '::' to '/' to convert namespaces to paths.
+  #
+  #   underscore('ActiveModel')         # => "active_model"
+  #   underscore('ActiveModel::Errors') # => "active_model/errors"
+  #
+  # @see https://github.com/rails/rails/blob/v6.1.7.2/activesupport/lib/active_support/inflector/methods.rb#L81-L100
+  #   `ActiveSupport::Inflector.underscore`
+  sig { params(camel_cased_word: T.any(String, Symbol)).returns(String) }
+  def self.underscore(camel_cased_word)
+    return camel_cased_word.to_s 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])/) do
+      T.must(::Regexp.last_match(1) || ::Regexp.last_match(2)) << "_"
+    end
+    word.tr!("-", "_")
+    word.downcase!
+    word
+  end
 end