Flag and envvar to include autobumped formulae

- This is useful for maintainers to check the full range of livecheck functionality.

Library/Homebrew/dev-cmd/livecheck.rb

@@ -14,7 +14,7 @@ module Homebrew
           Check for newer versions of formulae and/or casks from upstream.
           If no formula or cask argument is passed, the list of formulae and
           casks to check is taken from `HOMEBREW_LIVECHECK_WATCHLIST` or
-          `~/.homebrew/livecheck_watchlist.txt`, excluding autobumped formulae.
+          `~/.homebrew/livecheck_watchlist.txt`.
         EOS
         switch "--full-name",
                description: "Print formulae and casks with fully-qualified names."
@@ -38,6 +38,8 @@ module Homebrew
                description: "Only check casks."
         switch "--extract-plist",
                description: "Enable checking multiple casks with ExtractPlist strategy."
+        switch "--autobump",
+               description: "Include packages that are autobumped by BrewTestBot. By default these are skipped."
 
         conflicts "--debug", "--json"
         conflicts "--tap=", "--eval-all", "--installed"
@@ -90,8 +92,9 @@ module Homebrew
           end
         end
 
-        # Skip packages that are autobumped by BrewTestBot, if there are any.
-        if autobump_core_path.exist? && autobump_cask_path.exist?
+        # Skip packages that are autobumped by BrewTestBot, unless `--autobump`
+        # or `HOMEBREW_LIVECHECK_AUTOBUMP` are set.
+        if skip_autobump? && autobump_core_path.exist? && autobump_cask_path.exist?
           autobump_core = File.read(autobump_core_path).lines.map(&:strip)
           autobump_cask = File.read(autobump_cask_path).lines.map(&:strip)
 
@@ -141,6 +144,11 @@ module Homebrew
       def autobump_cask_path
         @autobump_cask_path ||= T.let(Tap.fetch("homebrew/cask").path/".github/autobump.txt", T.nilable(Pathname))
       end
+
+      sig { returns(T::Boolean) }
+      def skip_autobump?
+        !(args.autobump? || Homebrew::EnvConfig.livecheck_autobump?)
+      end
     end
   end
 end

Library/Homebrew/env_config.rb

@@ -303,6 +303,10 @@ module Homebrew
                       "or `$HOME/.homebrew/livecheck_watchlist.txt` otherwise.",
         default:      "#{ENV.fetch("HOMEBREW_USER_CONFIG_HOME")}/livecheck_watchlist.txt",
       },
+      HOMEBREW_LIVECHECK_AUTOBUMP:               {
+        description: "If set, `brew livecheck` will include data for packages that are autobumped by BrewTestBot.",
+        boolean:     true,
+      },
       HOMEBREW_LOCK_CONTEXT:                     {
         description: "If set, Homebrew will add this output as additional context for locking errors. " \
                      "This is useful when running `brew` in the background.",

Library/Homebrew/sorbet/rbi/dsl/homebrew/dev_cmd/livecheck_cmd.rbi

@@ -4,13 +4,15 @@
 # This is an autogenerated file for dynamic methods in `Homebrew::DevCmd::LivecheckCmd`.
 # Please instead update this file by running `bin/tapioca dsl Homebrew::DevCmd::LivecheckCmd`.
 
-
 class Homebrew::DevCmd::LivecheckCmd
   sig { returns(Homebrew::DevCmd::LivecheckCmd::Args) }
   def args; end
 end
 
 class Homebrew::DevCmd::LivecheckCmd::Args < Homebrew::CLI::Args
+  sig { returns(T::Boolean) }
+  def autobump?; end
+
   sig { returns(T::Boolean) }
   def cask?; end
 

Library/Homebrew/sorbet/rbi/dsl/homebrew/env_config.rbi

@@ -196,6 +196,9 @@ module Homebrew::EnvConfig
     sig { returns(String) }
     def livecheck_watchlist; end
 
+    sig { returns(T::Boolean) }
+    def livecheck_autobump?; end
+
     sig { returns(T.nilable(::String)) }
     def lock_context; end