implement Wiki#update_page

lib/gollum/wiki.rb

@@ -51,5 +51,24 @@ module Gollum
       parent = self.repo.commit('master')
       index.commit(commit[:message], [parent], actor)
     end
+
+    # Update an existing page with new content. The location of the page
+    # inside the repository and the page's format will not change.
+    #
+    # page   - The Gollum::Page to update.
+    # data   - The new String contents of the page.
+    # commit - The commit Hash details:
+    #          :message - The String commit message.
+    #          :author  - The String author full name.
+    #          :email   - The String email address.
+    #
+    # Returns the String SHA1 of the newly written version.
+    def update_page(page, data, commit = {})
+      index = self.repo.index
+      index.add(page.path, data)
+      actor = Grit::Actor.new(commit[:name], commit[:email])
+      parent = self.repo.commit('master')
+      index.commit(commit[:message], [parent], actor)
+    end
   end
 end

test/test_wiki.rb

@@ -33,6 +33,22 @@ context "Wiki page writing" do
     assert_equal "tom@github.com", @wiki.repo.commits.first.author.email
   end
 
+  test "update_page" do
+    commit = { :message => "Gollum page",
+               :name => "Tom Preston-Werner",
+               :email => "tom@github.com" }
+    @wiki.write_page("Gollum", :markdown, "# Gollum", commit)
+
+    page = @wiki.page("Gollum")
+    @wiki.update_page(page, "# Gollum2", commit)
+
+    assert_equal 2, @wiki.repo.commits.size
+    assert_equal "# Gollum2", @wiki.page("Gollum").raw_data
+    assert_equal "Gollum page", @wiki.repo.commits.first.message
+    assert_equal "Tom Preston-Werner", @wiki.repo.commits.first.author.name
+    assert_equal "tom@github.com", @wiki.repo.commits.first.author.email
+  end
+
   teardown do
     FileUtils.rm_r(File.join(File.dirname(__FILE__), *%w[examples test.git]))
   end