Convert update report to use composition

Library/Homebrew/cmd/update.rb

@@ -31,7 +31,7 @@ module Homebrew
     ensure
       link_tap_formula(tapped_formulae)
     end
-    report.merge!(master_updater.report)
+    report.update(master_updater.report)
 
     # rename Taps directories
     # this procedure will be removed in the future if it seems unnecessasry
@@ -46,7 +46,7 @@ module Homebrew
         rescue
           onoe "Failed to update tap: #{user.basename}/#{repo.basename.sub("homebrew-", "")}"
         else
-          report.merge!(updater.report) do |key, oldval, newval|
+          report.update(updater.report) do |key, oldval, newval|
             oldval.concat(newval)
           end
         end
@@ -207,7 +207,22 @@ class Updater
 end
 
 
-class Report < Hash
+class Report
+  def initialize
+    @hash = {}
+  end
+
+  def fetch(*args, &block)
+    @hash.fetch(*args, &block)
+  end
+
+  def update(*args, &block)
+    @hash.update(*args, &block)
+  end
+
+  def empty?
+    @hash.empty?
+  end
 
   def dump
     # Key Legend: Added (A), Copied (C), Deleted (D), Modified (M), Renamed (R)
@@ -216,8 +231,6 @@ class Report < Hash
     dump_formula_report :M, "Updated Formulae"
     dump_formula_report :D, "Deleted Formulae"
     dump_formula_report :R, "Renamed Formulae"
-#    dump_new_commands
-#    dump_deleted_commands
   end
 
   def tapped_formula_for key
@@ -268,5 +281,4 @@ class Report < Hash
       puts_columns formula.uniq
     end
   end
-
 end

Library/Homebrew/test/test_updater.rb

@@ -54,7 +54,7 @@ class UpdaterTests < Homebrew::TestCase
       @updater.in_repo_expect("git rev-parse -q --verify HEAD", "3456cdef")
       @updater.in_repo_expect("git diff-tree -r --raw -M85% 1234abcd 3456cdef", diff_output)
       @updater.pull!
-      @report.merge!(@updater.report)
+      @report.update(@updater.report)
     end
   end