yield the created SHA1 in the after_commit callback

lib/gollum/committer.rb

@@ -144,14 +144,15 @@ module Gollum
     def commit
       sha1 = index.commit(@options[:message], parents, actor)
       @callbacks.each do |cb|
-        cb.call(self)
+        cb.call(self, sha1)
       end
       sha1
     end
 
     # Adds a callback to be fired after a commit.
     #
-    # block - A block that expects this Committer instance as the argument.
+    # block - A block that expects this Committer instance and the created 
+    #         commit's SHA1 as the arguments.
     #
     # Returns nothing.
     def after_commit(&block)

lib/gollum/wiki.rb

@@ -205,7 +205,7 @@ module Gollum
 
       committer.add_to_index('', name, format, data)
 
-      committer.after_commit do |index|
+      committer.after_commit do |index, sha|
         @access.refresh
         index.update_working_dir('', name, format)
       end
@@ -256,7 +256,7 @@ module Gollum
         committer.add_to_index(dir, name, format, data, :allow_same_ext)
       end
 
-      committer.after_commit do |index|
+      committer.after_commit do |index, sha|
         @access.refresh
         index.update_working_dir(dir, page.name, page.format)
         index.update_working_dir(dir, name, format)
@@ -293,7 +293,7 @@ module Gollum
       
       committer.delete(page.path)
 
-      committer.after_commit do |index|
+      committer.after_commit do |index, sha|
         dir = ::File.dirname(page.path)
         dir = '' if dir == '.'
 
@@ -331,7 +331,7 @@ module Gollum
       parent    = committer.parents[0]
       committer.options[:tree] = @repo.git.apply_patch(parent.sha, patch)
       return false unless committer.options[:tree]
-      committer.after_commit do |index|
+      committer.after_commit do |index, sha|
         @access.refresh
 
         files = []

test/test_committer.rb

@@ -24,4 +24,27 @@ context "Wiki" do
     assert_equal 'bob',  committer.actor.name
     assert_equal 'foo@bar.com', committer.actor.email
   end
+
+  test "yield after_commit callback" do
+    @path = cloned_testpath('examples/lotr.git')
+    yielded = nil
+    begin
+      wiki = Gollum::Wiki.new(@path)
+      committer = Gollum::Committer.new(wiki)
+      committer.after_commit do |index, sha1|
+        yielded = sha1
+        assert_equal committer, index
+      end
+
+      res = wiki.write_page("Gollum", :markdown, "# Gollum", 
+        :committer => committer)
+
+      assert_equal committer, res
+
+      sha1 = committer.commit
+      assert_equal sha1, yielded
+    ensure
+      FileUtils.rm_rf(@path)
+    end
+  end
 end