1 files changed, 61 insertions, 0 deletions
diff --git a/Library/Homebrew/cask/lib/hbc/cli/internal_appcast_checkpoint.rb b/Library/Homebrew/cask/lib/hbc/cli/internal_appcast_checkpoint.rb
new file mode 100644
index 000000000..790e917b2
--- /dev/null
+++ b/Library/Homebrew/cask/lib/hbc/cli/internal_appcast_checkpoint.rb
@@ -0,0 +1,61 @@
+module Hbc
+  class CLI
+    class InternalAppcastCheckpoint < InternalUseBase
+      def self.run(*args)
+        calculate = args.include? "--calculate"
+        cask_tokens = cask_tokens_from(args)
+        raise CaskUnspecifiedError if cask_tokens.empty?
+
+        if cask_tokens.all? { |t| t =~ %r{^https?://} && t !~ /\.rb$/ }
+          appcask_checkpoint_for_url(cask_tokens)
+        else
+          appcask_checkpoint(cask_tokens, calculate)
+        end
+      end
+
+      def self.appcask_checkpoint_for_url(urls)
+        urls.each do |url|
+          appcast = DSL::Appcast.new(url)
+          puts appcast.calculate_checkpoint[:checkpoint]
+        end
+      end
+
+      def self.appcask_checkpoint(cask_tokens, calculate)
+        count = 0
+
+        cask_tokens.each do |cask_token|
+          cask = Hbc.load(cask_token)
+
+          if cask.appcast.nil?
+            opoo "Cask '#{cask}' is missing an `appcast` stanza."
+          else
+            if calculate
+              result = cask.appcast.calculate_checkpoint
+
+              checkpoint = result[:checkpoint]
+            else
+              checkpoint = cask.appcast.checkpoint
+            end
+
+            if checkpoint.nil?
+              onoe "Could not retrieve `appcast` checkpoint for cask '#{cask}': #{result[:command_result].stderr}"
+            else
+              puts cask_tokens.count > 1 ? "#{checkpoint}  #{cask}": checkpoint
+              count += 1
+            end
+          end
+        end
+
+        count == cask_tokens.count
+      end
+
+      def self.help
+        "prints or calculates a given Cask's or URL's appcast checkpoint"
+      end
+
+      def self.needs_init?
+        true
+      end
+    end
+  end
+end