Revisions#diff
<%= link_to 'Revisions', node_revisions_path(@node) %>
Comparing <%= describe_page_reference(params[:start_revision]) %>
against <%= describe_page_reference(params[:end_revision]) %>
<% numeric_comparison = params[:start_revision].to_s =~ /\A\d+\z/ && params[:end_revision].to_s =~ /\A\d+\z/ %>
<% if numeric_comparison %>
<%= 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 %>
<% else %>
<%= link_to 'Compare two numbered revisions instead', node_revisions_path(@node) %>
<% end %>
<% if @available_layer_pairs.present? %>
<% @available_layer_pairs.each do |pair| %>
<% next if [params[:start_revision].to_s, params[:end_revision].to_s].sort == pair.map(&:to_s).sort %>
<%= button_to "Diff #{pair.first.to_s.capitalize} vs. #{pair.last.to_s.capitalize}",
diff_node_revisions_path(@node),
method: :get,
params: { start_revision: pair.first, end_revision: pair.last, view: @diff_view },
form: { class: 'button_to computation' } %>
<% end %>
<% if !@locked_by_other && (@node.autosave || @node.draft) %>
<%= button_to (@node.draft && !@node.autosave ? 'Destroy Draft' : 'Discard Autosave'),
revert_node_path(@node), method: :put,
params: { return_to: request.fullpath },
form: { data: { confirm: "This cannot be undone. Continue?" }, class: 'button_to destructive' } %>
<% end %>
<% end %>
<% if @diff_view == :side_by_side %>
Title
<%= raw @diff[:title][0] %>
Abstract
<%= raw @diff[:abstract][0] %>
Body
<%= raw @diff[:body][0] %>
Title
<%= raw @diff[:title][1] %>
Abstract
<%= raw @diff[:abstract][1] %>
Body
<%= raw @diff[:body][1] %>
<% else %>
Title
<%= raw @diff[:title] %>
Abstract
<%= raw @diff[:abstract] %>
Body
<%= raw @diff[:body] %>
<% end %>