Add variations to Cask#to_h

Library/Homebrew/cask/cask.rb

@@ -6,6 +6,7 @@ require "cask/config"
 require "cask/dsl"
 require "cask/metadata"
 require "searchable"
+require "utils/bottles"
 
 module Cask
   # An instance of a cask.
@@ -58,6 +59,10 @@ module Cask
     def config=(config)
       @config = config
 
+      refresh
+    end
+
+    def refresh
       @dsl = DSL.new(self)
       return unless @block
 
@@ -214,7 +219,7 @@ module Cask
     end
     alias == eql?
 
-    def to_h
+    def to_hash
       {
         "token"          => token,
         "full_token"     => full_name,
@@ -238,6 +243,42 @@ module Cask
       }
     end
 
+    def to_h
+      hash = to_hash
+      variations = {}
+
+      hash_keys_to_skip = %w[outdated installed versions]
+
+      if @dsl.on_system_blocks_exist?
+        [:arm, :intel].each do |arch|
+          MacOS::Version::SYMBOLS.each_key do |os_name|
+            # Big Sur is the first version of macOS that supports arm
+            next if arch == :arm && MacOS::Version.from_symbol(os_name) < MacOS::Version.from_symbol(:big_sur)
+
+            Homebrew::Override.os = os_name
+            Homebrew::Override.arch = arch
+
+            refresh
+
+            bottle_tag = ::Utils::Bottles::Tag.new(system: os_name, arch: arch).to_sym
+            to_hash.each do |key, value|
+              next if hash_keys_to_skip.include? key
+              next if value.to_s == hash[key].to_s
+
+              variations[bottle_tag] ||= {}
+              variations[bottle_tag][key] = value
+            end
+          end
+        end
+      end
+
+      Homebrew::Override.clear
+      refresh
+
+      hash["variations"] = variations
+      hash
+    end
+
     private
 
     def to_h_string_gsubs(string)