Resolve formulae in `brew cleanup`.

Library/Homebrew/cleanup.rb

@@ -166,7 +166,7 @@ module Homebrew
       else
         args.each do |arg|
           formula = begin
-            Formula[arg]
+            Formulary.resolve(arg)
           rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
             nil
           end

Library/Homebrew/extend/ARGV.rb

@@ -54,35 +54,7 @@ module HomebrewArgvExtension
   def resolved_formulae
     require "formula"
     @resolved_formulae ||= (downcased_unique_named - casks).map do |name|
-      if name.include?("/") || File.exist?(name)
-        f = Formulary.factory(name, spec)
-        if f.any_version_installed?
-          tab = Tab.for_formula(f)
-          resolved_spec = spec(nil) || tab.spec
-          f.active_spec = resolved_spec if f.send(resolved_spec)
-          f.build = tab
-          if f.head? && tab.tabfile
-            k = Keg.new(tab.tabfile.parent)
-            f.version.update_commit(k.version.version.commit) if k.version.head?
-          end
-        end
-      else
-        rack = Formulary.to_rack(name)
-        alias_path = Formulary.factory(name).alias_path
-        f = Formulary.from_rack(rack, spec(nil), alias_path: alias_path)
-      end
-
-      # If this formula was installed with an alias that has since changed,
-      # then it was specified explicitly in ARGV. (Using the alias would
-      # instead have found the new formula.)
-      #
-      # Because of this, the user is referring to this specific formula,
-      # not any formula targetted by the same alias, so in this context
-      # the formula shouldn't be considered outdated if the alias used to
-      # install it has changed.
-      f.follow_installed_alias = false
-
-      f
+      Formulary.resolve(name, spec: spec(nil))
     end.uniq(&:name)
   end
 

Library/Homebrew/formulary.rb

@@ -47,6 +47,38 @@ module Formulary
     cache[path] = klass
   end
 
+  def self.resolve(name, spec: nil)
+    if name.include?("/") || File.exist?(name)
+      f = factory(name, *spec)
+      if f.any_version_installed?
+        tab = Tab.for_formula(f)
+        resolved_spec = spec || tab.spec
+        f.active_spec = resolved_spec if f.send(resolved_spec)
+        f.build = tab
+        if f.head? && tab.tabfile
+          k = Keg.new(tab.tabfile.parent)
+          f.version.update_commit(k.version.version.commit) if k.version.head?
+        end
+      end
+    else
+      rack = to_rack(name)
+      alias_path = factory(name).alias_path
+      f = from_rack(rack, *spec, alias_path: alias_path)
+    end
+
+    # If this formula was installed with an alias that has since changed,
+    # then it was specified explicitly in ARGV. (Using the alias would
+    # instead have found the new formula.)
+    #
+    # Because of this, the user is referring to this specific formula,
+    # not any formula targetted by the same alias, so in this context
+    # the formula shouldn't be considered outdated if the alias used to
+    # install it has changed.
+    f.follow_installed_alias = false
+
+    f
+  end
+
   def self.ensure_utf8_encoding(io)
     io.set_encoding(Encoding::UTF_8)
   end