Add internal command to calculate appcast checkpoint.

1 files changed, 45 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..6de76cbc7
--- /dev/null
+++ b/Library/Homebrew/cask/lib/hbc/cli/internal_appcast_checkpoint.rb
@@ -0,0 +1,45 @@
+module Hbc
+  class CLI
+    class InternalAppcastCheckpoint < InternalUseBase
+      def self.run(*args)
+        cask_tokens = cask_tokens_from(args)
+        raise CaskUnspecifiedError if cask_tokens.empty?
+
+        appcask_checkpoint(cask_tokens)
+      end
+
+      def self.appcask_checkpoint(cask_tokens)
+        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
+            result = cask.appcast.calculate_checkpoint
+
+            checkpoint = result[:checkpoint]
+
+            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
+        "calculates a given Cask's appcast checkpoint"
+      end
+
+      def self.needs_init?
+        true
+      end
+    end
+  end
+end