Use prepended modules instead of undef for OS-specific code

Library/Homebrew/cli/args.rb

@@ -19,9 +19,6 @@ class Args < OpenStruct
       sig { returns(T::Array[String]) }
       attr_reader :options_only, :flags_only
 
-      # undefine tap to allow --tap argument
-      undef tap
-
       sig { void }
       def initialize
         require "cli/named_args"

Library/Homebrew/cli/parser.rb

@@ -24,6 +24,9 @@ class Parser
       }.freeze, T::Hash[Symbol, String])
       private_constant :ArgType, :HIDDEN_DESC_PLACEHOLDER, :SYMBOL_TO_USAGE_MAPPING
 
+      sig { returns(Args) }
+      attr_reader :args
+
       sig { returns(Args::OptionsType) }
       attr_reader :processed_options
 

Library/Homebrew/extend/os/linux/cleanup.rb

@@ -1,23 +1,29 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Homebrew
-  class Cleanup
-    undef use_system_ruby?
+module OS
+  module Linux
+    module Cleanup
+      extend T::Helpers
 
-    sig { returns(T::Boolean) }
-    def use_system_ruby?
-      return false if Homebrew::EnvConfig.force_vendor_ruby?
+      requires_ancestor { Homebrew::Cleanup }
 
-      rubies = [which("ruby"), which("ruby", ORIGINAL_PATHS)].compact
-      system_ruby = Pathname.new("/usr/bin/ruby")
-      rubies << system_ruby if system_ruby.exist?
+      sig { returns(T::Boolean) }
+      def use_system_ruby?
+        return false if Homebrew::EnvConfig.force_vendor_ruby?
 
-      check_ruby_version = HOMEBREW_LIBRARY_PATH/"utils/ruby_check_version_script.rb"
-      rubies.uniq.any? do |ruby|
-        quiet_system ruby, "--enable-frozen-string-literal", "--disable=gems,did_you_mean,rubyopt",
-                     check_ruby_version, RUBY_VERSION
+        rubies = [which("ruby"), which("ruby", ORIGINAL_PATHS)].compact
+        system_ruby = Pathname.new("/usr/bin/ruby")
+        rubies << system_ruby if system_ruby.exist?
+
+        check_ruby_version = HOMEBREW_LIBRARY_PATH/"utils/ruby_check_version_script.rb"
+        rubies.uniq.any? do |ruby|
+          quiet_system ruby, "--enable-frozen-string-literal", "--disable=gems,did_you_mean,rubyopt",
+                       check_ruby_version, RUBY_VERSION
+        end
       end
     end
   end
 end
+
+Homebrew::Cleanup.prepend(OS::Linux::Cleanup)

Library/Homebrew/extend/os/linux/cli/parser.rb

@@ -0,0 +1,31 @@
+# typed: strict
+# frozen_string_literal: true
+
+module OS
+  module Linux
+    module CLI
+      module Parser
+        extend T::Helpers
+
+        requires_ancestor { Homebrew::CLI::Parser }
+
+        sig { void }
+        def set_default_options
+          args["formula?"] = true if args.respond_to?(:formula?)
+        end
+
+        sig { void }
+        def validate_options
+          return unless args.respond_to?(:cask?)
+          return unless args.cask?
+
+          # NOTE: We don't raise an error here because we don't want
+          #       to print the help page or a stack trace.
+          odie "Invalid `--cask` usage: Casks do not work on Linux"
+        end
+      end
+    end
+  end
+end
+
+Homebrew::CLI::Parser.prepend(OS::Linux::CLI::Parser)

Library/Homebrew/extend/os/linux/formula.rb

@@ -1,52 +1,56 @@
 # typed: true # rubocop:disable Sorbet/StrictSigil
 # frozen_string_literal: true
 
-class Formula
-  undef shared_library
-  undef loader_path
-  undef deuniversalize_machos
-  undef add_global_deps_to_spec
-  undef valid_platform?
-
-  sig { params(name: String, version: T.nilable(T.any(String, Integer))).returns(String) }
-  def shared_library(name, version = nil)
-    suffix = if version == "*" || (name == "*" && version.blank?)
-      "{,.*}"
-    elsif version.present?
-      ".#{version}"
-    end
-    "#{name}.so#{suffix}"
-  end
+module OS
+  module Linux
+    module Formula
+      extend T::Helpers
 
-  sig { returns(String) }
-  def loader_path
-    "$ORIGIN"
-  end
+      requires_ancestor { ::Formula }
 
-  sig { params(targets: T.nilable(T.any(Pathname, String))).void }
-  def deuniversalize_machos(*targets); end
-
-  sig { params(spec: SoftwareSpec).void }
-  def add_global_deps_to_spec(spec)
-    return unless DevelopmentTools.needs_build_formulae?
-
-    @global_deps ||= begin
-      dependency_collector = spec.dependency_collector
-      related_formula_names = Set.new([
-        name,
-        *aliases,
-        *versioned_formulae_names,
-      ])
-      [
-        dependency_collector.gcc_dep_if_needed(related_formula_names),
-        dependency_collector.glibc_dep_if_needed(related_formula_names),
-      ].compact.freeze
-    end
-    @global_deps.each { |dep| spec.dependency_collector.add(dep) }
-  end
+      sig { params(name: String, version: T.nilable(T.any(String, Integer))).returns(String) }
+      def shared_library(name, version = nil)
+        suffix = if version == "*" || (name == "*" && version.blank?)
+          "{,.*}"
+        elsif version.present?
+          ".#{version}"
+        end
+        "#{name}.so#{suffix}"
+      end
+
+      sig { returns(String) }
+      def loader_path
+        "$ORIGIN"
+      end
 
-  sig { returns(T::Boolean) }
-  def valid_platform?
-    requirements.none?(MacOSRequirement)
+      sig { params(targets: T.nilable(T.any(Pathname, String))).void }
+      def deuniversalize_machos(*targets); end
+
+      sig { params(spec: SoftwareSpec).void }
+      def add_global_deps_to_spec(spec)
+        return unless DevelopmentTools.needs_build_formulae?
+
+        @global_deps ||= begin
+          dependency_collector = spec.dependency_collector
+          related_formula_names = Set.new([
+            name,
+            *aliases,
+            *versioned_formulae_names,
+          ])
+          [
+            dependency_collector.gcc_dep_if_needed(related_formula_names),
+            dependency_collector.glibc_dep_if_needed(related_formula_names),
+          ].compact.freeze
+        end
+        @global_deps.each { |dep| spec.dependency_collector.add(dep) }
+      end
+
+      sig { returns(T::Boolean) }
+      def valid_platform?
+        requirements.none?(MacOSRequirement)
+      end
+    end
   end
 end
+
+Formula.prepend(OS::Linux::Formula)

Library/Homebrew/extend/os/mac/cleaner.rb

@@ -1,13 +1,17 @@
 # typed: strict
 # frozen_string_literal: true
 
-class Cleaner
-  private
+module OS
+  module Mac
+    module Cleaner
+      private
 
-  undef executable_path?
-
-  sig { params(path: Pathname).returns(T::Boolean) }
-  def executable_path?(path)
-    path.mach_o_executable? || path.text_executable?
+      sig { params(path: Pathname).returns(T::Boolean) }
+      def executable_path?(path)
+        path.mach_o_executable? || path.text_executable?
+      end
+    end
   end
 end
+
+Cleaner.prepend(OS::Mac::Cleaner)

Library/Homebrew/extend/os/mac/cleanup.rb

@@ -1,15 +1,17 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Homebrew
-  class Cleanup
-    undef use_system_ruby?
+module OS
+  module Mac
+    module Cleanup
+      sig { returns(T::Boolean) }
+      def use_system_ruby?
+        return false if Homebrew::EnvConfig.force_vendor_ruby?
 
-    sig { returns(T::Boolean) }
-    def use_system_ruby?
-      return false if Homebrew::EnvConfig.force_vendor_ruby?
-
-      Homebrew::EnvConfig.developer? && ENV["HOMEBREW_USE_RUBY_FROM_PATH"].present?
+        Homebrew::EnvConfig.developer? && ENV["HOMEBREW_USE_RUBY_FROM_PATH"].present?
+      end
     end
   end
 end
+
+Homebrew::Cleanup.prepend(OS::Mac::Cleanup)

Library/Homebrew/extend/os/mac/dev-cmd/bottle.rb

@@ -1,26 +1,26 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Homebrew
-  module DevCmd
-    class Bottle < AbstractCommand
-      undef tar_args
-
-      sig { returns(T::Array[String]) }
-      def tar_args
-        if MacOS.version >= :catalina
-          ["--no-mac-metadata", "--no-acls", "--no-xattrs"].freeze
-        else
-          [].freeze
+module OS
+  module Mac
+    module DevCmd
+      module Bottle
+        sig { returns(T::Array[String]) }
+        def tar_args
+          if MacOS.version >= :catalina
+            ["--no-mac-metadata", "--no-acls", "--no-xattrs"].freeze
+          else
+            [].freeze
+          end
         end
-      end
-
-      undef gnu_tar
 
-      sig { params(gnu_tar_formula: Formula).returns(String) }
-      def gnu_tar(gnu_tar_formula)
-        "#{gnu_tar_formula.opt_bin}/gtar"
+        sig { params(gnu_tar_formula: Formula).returns(String) }
+        def gnu_tar(gnu_tar_formula)
+          "#{gnu_tar_formula.opt_bin}/gtar"
+        end
       end
     end
   end
 end
+
+Homebrew::DevCmd::Bottle.prepend(OS::Mac::DevCmd::Bottle)

Library/Homebrew/extend/os/mac/formula.rb

@@ -1,33 +1,39 @@
 # typed: strict
 # frozen_string_literal: true
 
-class Formula
-  undef valid_platform?
-  undef std_cmake_args
+module OS
+  module Mac
+    module Formula
+      extend T::Helpers
 
-  sig { returns(T::Boolean) }
-  def valid_platform?
-    requirements.none?(LinuxRequirement)
-  end
+      requires_ancestor { ::Formula }
+
+      sig { returns(T::Boolean) }
+      def valid_platform?
+        requirements.none?(LinuxRequirement)
+      end
+
+      sig {
+        params(
+          install_prefix: T.any(String, Pathname),
+          install_libdir: T.any(String, Pathname),
+          find_framework: String,
+        ).returns(T::Array[String])
+      }
+      def std_cmake_args(install_prefix: prefix, install_libdir: "lib", find_framework: "LAST")
+        args = generic_std_cmake_args(install_prefix:, install_libdir:, find_framework:)
 
-  sig {
-    params(
-      install_prefix: T.any(String, Pathname),
-      install_libdir: T.any(String, Pathname),
-      find_framework: String,
-    ).returns(T::Array[String])
-  }
-  def std_cmake_args(install_prefix: prefix, install_libdir: "lib", find_framework: "LAST")
-    args = generic_std_cmake_args(install_prefix:, install_libdir:,
-                                  find_framework:)
-
-    # Avoid false positives for clock_gettime support on 10.11.
-    # CMake cache entries for other weak symbols may be added here as needed.
-    args << "-DHAVE_CLOCK_GETTIME:INTERNAL=0" if MacOS.version == "10.11" && MacOS::Xcode.version >= "8.0"
-
-    # Ensure CMake is using the same SDK we are using.
-    args << "-DCMAKE_OSX_SYSROOT=#{MacOS.sdk_for_formula(self).path}" if MacOS.sdk_root_needed?
-
-    args
+        # Avoid false positives for clock_gettime support on 10.11.
+        # CMake cache entries for other weak symbols may be added here as needed.
+        args << "-DHAVE_CLOCK_GETTIME:INTERNAL=0" if MacOS.version == "10.11" && MacOS::Xcode.version >= "8.0"
+
+        # Ensure CMake is using the same SDK we are using.
+        args << "-DCMAKE_OSX_SYSROOT=#{MacOS.sdk_for_formula(self).path}" if MacOS.sdk_root_needed?
+
+        args
+      end
+    end
   end
 end
+
+Formula.prepend(OS::Mac::Formula)