rubocops: add emoji audit

Library/Homebrew/rubocops/shared/desc_helper.rb

@@ -74,6 +74,11 @@ module RuboCop
           desc_problem "Description shouldn't end with a full stop."
         end
 
+        # Check if the desc contains unicode characters in the So (emojis or other symbols) range.
+        if regex_match_group(desc, /\p{So}/)
+          desc_problem "Description shouldn't contain emojis or unicode characters in the So range."
+        end
+
         # Check if the desc length exceeds maximum length.
         return if desc_length <= MAX_DESC_LENGTH
 
@@ -106,6 +111,7 @@ module RuboCop
           correction.gsub!(/^\s+/, "")
           correction.gsub!(/\s+$/, "")
           correction.gsub!(/\.$/, "")
+          correction.gsub!(/\s?\p{So}/, "")
 
           corrector.replace(@offensive_node.source_range, "#{quote}#{correction}#{quote}")
         end

Library/Homebrew/test/rubocops/cask/desc_spec.rb

@@ -110,6 +110,13 @@ describe RuboCop::Cop::Cask::Desc, :config do
       end
     RUBY
 
+    expect_offense <<~RUBY
+      cask 'foo' do
+        desc 'Description with a 🍺 symbol'
+                                 ^ Description shouldn't contain emojis or unicode characters in the So range.
+      end
+    RUBY
+
     expect_no_offenses <<~RUBY
       cask 'foo' do
         desc 'MAC address changer'

Library/Homebrew/test/rubocops/desc_spec.rb

@@ -134,6 +134,23 @@ describe RuboCop::Cop::FormulaAudit::Desc do
       RUBY
     end
 
+    it "reports and corrects an offense when the description contains Unicode So characters" do
+      expect_offense(<<~RUBY, "/homebrew-core/Formula/foo.rb")
+        class Foo < Formula
+          url 'https://brew.sh/foo-1.0.tgz'
+          desc 'Description with a 🍺 symbol'
+                                   ^ FormulaAudit/Desc: Description shouldn't contain emojis or unicode characters in the So range.
+        end
+      RUBY
+
+      expect_correction(<<~RUBY)
+        class Foo < Formula
+          url 'https://brew.sh/foo-1.0.tgz'
+          desc 'Description with a symbol'
+        end
+      RUBY
+    end
+
     it "does not report an offense when the description ends with 'etc.'" do
       expect_no_offenses(<<~RUBY, "/homebrew-core/Formula/foo.rb")
         class Foo < Formula