5 files changed, 65 insertions, 2 deletions
diff --git a/Library/Homebrew/cask/lib/hbc/auditor.rb b/Library/Homebrew/cask/lib/hbc/auditor.rb
index 6b0c1c476..ee1b50938 100644
--- a/Library/Homebrew/cask/lib/hbc/auditor.rb
+++ b/Library/Homebrew/cask/lib/hbc/auditor.rb
@@ -1,6 +1,23 @@
 module Hbc
   class Auditor
     def self.audit(cask, audit_download: false, check_token_conflicts: false)
+      saved_languages = MacOS.instance_variable_get(:@languages)
+
+      if languages_blocks = cask.instance_variable_get(:@dsl).instance_variable_get(:@language_blocks)
+        languages_blocks.keys.each do |languages|
+          ohai "Auditing language: #{languages.map { |lang| "'#{lang}'" }.join(", ")}"
+          MacOS.instance_variable_set(:@languages, languages)
+          audit_cask_instance(Hbc.load(cask.sourcefile_path), audit_download, check_token_conflicts)
+          CLI::Cleanup.run(cask.token) if audit_download
+        end
+      else
+        audit_cask_instance(cask, audit_download, check_token_conflicts)
+      end
+    ensure
+      MacOS.instance_variable_set(:@languages, saved_languages)
+    end
+
+    def self.audit_cask_instance(cask, audit_download, check_token_conflicts)
       download = audit_download && Download.new(cask)
       audit = Audit.new(cask, download:              download,
                               check_token_conflicts: check_token_conflicts)
diff --git a/Library/Homebrew/cask/lib/hbc/cask.rb b/Library/Homebrew/cask/lib/hbc/cask.rb
index 756b05b83..1e2056efc 100644
--- a/Library/Homebrew/cask/lib/hbc/cask.rb
+++ b/Library/Homebrew/cask/lib/hbc/cask.rb
@@ -11,7 +11,10 @@ module Hbc
       @token = token
       @sourcefile_path = sourcefile_path
       @dsl = dsl || DSL.new(@token)
-      @dsl.instance_eval(&block) if block_given?
+      if block_given?
+        @dsl.instance_eval(&block)
+        @dsl.language_eval
+      end
     end
 
     DSL::DSL_METHODS.each do |method_name|
diff --git a/Library/Homebrew/cask/lib/hbc/cli.rb b/Library/Homebrew/cask/lib/hbc/cli.rb
index 3f67e131d..f637ae7af 100644
--- a/Library/Homebrew/cask/lib/hbc/cli.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli.rb
@@ -179,6 +179,10 @@ module Hbc
     def self.parser
       # If you modify these arguments, please update USAGE.md
       @parser ||= OptionParser.new do |opts|
+        opts.on("--language STRING") do
+          # handled in OS::Mac
+        end
+
         OPTIONS.each do |option, method|
           opts.on("#{option}" "PATH", Pathname) do |path|
             Hbc.public_send(method, path)
diff --git a/Library/Homebrew/cask/lib/hbc/dsl.rb b/Library/Homebrew/cask/lib/hbc/dsl.rb
index 83c0bf1fb..8e0a7715a 100644
--- a/Library/Homebrew/cask/lib/hbc/dsl.rb
+++ b/Library/Homebrew/cask/lib/hbc/dsl.rb
@@ -1,4 +1,5 @@
 require "set"
+require "locale"
 
 require "hbc/dsl/appcast"
 require "hbc/dsl/base"
@@ -64,6 +65,7 @@ module Hbc
                             :depends_on,
                             :gpg,
                             :homepage,
+                            :language,
                             :license,
                             :name,
                             :sha256,
@@ -98,6 +100,43 @@ module Hbc
       @homepage ||= homepage
     end
 
+    def language(*args, default: false, &block)
+      if !args.empty? && block_given?
+        @language_blocks ||= {}
+        @language_blocks[args] = block
+
+        return unless default
+
+        unless @language_blocks.default.nil?
+          raise CaskInvalidError.new(token, "Only one default language may be defined")
+        end
+
+        @language_blocks.default = block
+      else
+        language_eval
+      end
+    end
+
+    def language_eval
+      return @language if instance_variable_defined?(:@language)
+
+      if @language_blocks.nil? || @language_blocks.empty?
+        return @language = nil
+      end
+
+      MacOS.languages.map(&Locale.method(:parse)).each do |locale|
+        key = @language_blocks.keys.detect { |strings|
+          strings.any? { |string| locale.include?(string) }
+        }
+
+        next if key.nil?
+
+        return @language = @language_blocks[key].call
+      end
+
+      @language = @language_blocks.default.call
+    end
+
     def url(*args, &block)
       url_given = !args.empty? || block_given?
       return @url unless url_given
diff --git a/Library/Homebrew/cask/lib/hbc/dsl/base.rb b/Library/Homebrew/cask/lib/hbc/dsl/base.rb
index ccf93dae9..20a3cec61 100644
--- a/Library/Homebrew/cask/lib/hbc/dsl/base.rb
+++ b/Library/Homebrew/cask/lib/hbc/dsl/base.rb
@@ -8,7 +8,7 @@ module Hbc
         @command = command
       end
 
-      def_delegators :@cask, :token, :version, :caskroom_path, :staged_path, :appdir
+      def_delegators :@cask, :token, :version, :caskroom_path, :staged_path, :appdir, :language
 
       def system_command(executable, options = {})
         @command.run!(executable, options)