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@@ -85,6 +85,13 @@ end
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   end
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 end
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+get '/a/patch/:page/:rev' do
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+  @page = Page.new(page_with_ext)
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+  header 'Content-Type' => 'text/x-diff'
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+  header 'Content-Disposition' => 'filename=patch.diff'
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+  @page.delta(params[:rev])
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+end
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+
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 get '/a/tarball' do
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   header 'Content-Type' => 'application/x-gzip'
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   header 'Content-Disposition' => 'filename=archive.tgz'

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@@ -1,6 +1,7 @@
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 <h1>Diff of <a href="/<%= @page.name %>"><%= @page.name %></a></h1>
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 <div class="sub_nav">
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+  <a href="/a/patch/<%= @page.name %>/<%= params[:rev] %>" class="nav_link">patch file</a> &bull;
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   <a href="/h/<%= @page.name %>" class="nav_link">history</a> &bull;
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   <a href="/e/<%= @page.name %>" class="nav_link">edit</a> 
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 </div>