Tweak formula deprecation/disabling.

Library/Homebrew/cmd/install.rb

@@ -315,7 +315,6 @@ module Homebrew
   end
 
   def install_formula(f)
-    opoo "#{f.name} has been deprecated" if f.is_deprecated?
     f.print_tap_action
     build_options = f.build
 

Library/Homebrew/cmd/reinstall.rb

@@ -61,7 +61,6 @@ module Homebrew
         onoe "#{f.full_name} is pinned. You must unpin it to reinstall."
         next
       end
-      opoo "#{f.name} has been deprecated" if f.is_deprecated?
       Migrator.migrate_if_needed(f)
       reinstall_formula(f)
       Cleanup.install_formula_clean!(f)

Library/Homebrew/cmd/upgrade.rb

@@ -150,8 +150,6 @@ module Homebrew
   def upgrade_formula(f)
     return if args.dry_run?
 
-    opoo "#{f.name} has been deprecated" if f.is_deprecated?
-
     if f.opt_prefix.directory?
       keg = Keg.new(f.opt_prefix.resolved_path)
       keg_had_linked_opt = true

Library/Homebrew/formula.rb

@@ -53,7 +53,6 @@ class Formula
   include Utils::Inreplace
   include Utils::Shebang
   include Utils::Shell
-  include Utils::Deprecate
   extend Enumerable
   extend Forwardable
   extend Cachable
@@ -178,16 +177,6 @@ class Formula
   attr_accessor :follow_installed_alias
   alias follow_installed_alias? follow_installed_alias
 
-  # A Boolean indicating whether this formula is deprecated or not
-  # Defaults to false
-  attr_accessor :is_deprecated
-  alias is_deprecated? is_deprecated
-
-  # A Boolean indicating whether this formula is disabled
-  # Defaults to false
-  attr_accessor :is_disabled
-  alias is_disabled? is_disabled
-
   # @private
   def initialize(name, path, spec, alias_path: nil)
     @name = name
@@ -224,8 +213,6 @@ class Formula
     @follow_installed_alias = true
     @prefix_returns_versioned_prefix = false
     @oldname_lock = nil
-    @is_deprecated = false
-    @is_disabled = false
   end
 
   # @private
@@ -1118,6 +1105,20 @@ class Formula
     end
   end
 
+  # Whether this {Formula} is deprecated (i.e. warns on installation).
+  # Defaults to false.
+  # @return [Boolean]
+  def deprecated?
+    self.class.deprecated?
+  end
+
+  # Whether this {Formula} is disabled (i.e. cannot be installed).
+  # Defaults to false.
+  # @return [Boolean]
+  def disabled?
+    self.class.disabled?
+  end
+
   def skip_cxxstdlib_check?
     false
   end
@@ -2618,6 +2619,34 @@ class Formula
       @pour_bottle_check.instance_eval(&block)
     end
 
+    # Deprecates a {Formula} so a warning is shown on each installation.
+    def deprecate!(date: nil)
+      return if date.present? && Date.parse(date) > Date.today
+
+      @deprecated = true
+    end
+
+    # Whether this {Formula} is deprecated (i.e. warns on installation).
+    # Defaults to false.
+    # @return [Boolean]
+    def deprecated?
+      @deprecated == true
+    end
+
+    # Disables a {Formula} so it cannot be installed.
+    def disable!(date: nil)
+      return if date.present? && Date.parse(date) > Date.today
+
+      @disabled = true
+    end
+
+    # Whether this {Formula} is disabled (i.e. cannot be installed).
+    # Defaults to false.
+    # @return [Boolean]
+    def disabled?
+      @disabled == true
+    end
+
     # @private
     def link_overwrite(*paths)
       paths.flatten!

Library/Homebrew/formula_installer.rb

@@ -161,6 +161,12 @@ class FormulaInstaller
   def check_install_sanity
     raise FormulaInstallationAlreadyAttemptedError, formula if self.class.attempted.include?(formula)
 
+    if formula.deprecated?
+      opoo "#{formula.full_name} has been deprecated!"
+    elsif formula.disabled?
+      odie "#{formula.full_name} has been disabled!"
+    end
+
     return if ignore_deps?
 
     recursive_deps = formula.recursive_dependencies

Library/Homebrew/utils.rb

@@ -13,7 +13,6 @@ require "utils/link"
 require "utils/popen"
 require "utils/svn"
 require "utils/tty"
-require "utils/deprecate"
 require "tap_constants"
 require "time"
 

Library/Homebrew/utils/deprecate.rb

@@ -1,35 +0,0 @@
-# frozen_string_literal: true
-
-module Utils
-  module Deprecate
-    # This module is common for both formulae and casks.
-    # To-do : Add support for casks + add disable method
-
-    def deprecate
-      self.is_deprecated = true
-
-      # deprecate all formulae dependent on this deprecated formula
-      all_formulae = ObjectSpace.each_object(Class).select { |klass| klass < Formula }
-      all_formulae.each do |f|
-        dependencies = f.recursive_dependencies.map(&:name)
-        f.is_deprecated = true if (dependencies.include? self.name)
-      end
-    end
-
-    # Deprecation can be revoked if the underlying problem is fixed
-    def revoke_deprecation
-      self.is_deprecated = false
-
-      # revoke deprecation from dependents as well
-      all_formulae = ObjectSpace.each_object(Class).select { |klass| klass < Formula }
-      all_formulae.each do |f|
-        dependencies = f.recursive_dependencies.map(&:name)
-        revoke = true
-        dependencies.each do |d|
-          revoke = !(d != self && d.is_deprecated?)
-        end
-        f.is_deprecated = false if revoke && (dependencies.include? self.name)
-      end
-    end
-  end
-end