app/views/revisions/diff.html.erb


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<h1>Revisions#diff</h1>

<p class="node_action_bar standalone_action_bar">
  <%= link_to 'Revisions', node_revisions_path(@node) %>
</p>

<%= form_tag diff_node_revisions_path do %>
  <%= select_tag :start_revision, options_for_select(@node.pages.map{|x| x.revision}, params[:start_revision].to_i) %>
  <%= select_tag :end_revision, options_for_select(@node.pages.map{|x| x.revision}, params[:end_revision].to_i) %>
  <%= select_tag :view, options_for_select([['Inline', 'inline'], ['Side by side', 'side_by_side']], @diff_view) %>
  <%= submit_tag 'Diff' %>
<% end %>

<div id="diffview">
  <% if @diff_view == :side_by_side %>
    <div class="diff_side_by_side">
      <div class="diff_column">
        <h3>Title</h3>
        <p><%= raw @diff[:title][0] %></p>
        <h3>Abstract</h3>
        <p><%= raw @diff[:abstract][0] %></p>
        <h3>Body</h3>
        <%= raw @diff[:body][0] %>
      </div>
      <div class="diff_column">
        <h3>Title</h3>
        <p><%= raw @diff[:title][1] %></p>
        <h3>Abstract</h3>
        <p><%= raw @diff[:abstract][1] %></p>
        <h3>Body</h3>
        <%= raw @diff[:body][1] %>
      </div>
    </div>
  <% else %>
    <h3>Title</h3>
    <p><%= raw @diff[:title] %></p>
    <h3>Abstract</h3>
    <p><%= raw @diff[:abstract] %></p>
    <h3>Body</h3>
    <%= raw @diff[:body] %>
  <% end %>
</div>