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module RevisionsHelper
# Human-readable label for a diff endpoint -- "head"/"draft"/"autosave"
# get their name; anything else is a revision number.
def describe_page_reference(ref)
%w[head draft autosave].include?(ref.to_s) ? ref.to_s.capitalize : "revision #{ref}"
end
def neighbour_revision_pairs node, start_ref, end_ref
return [nil, nil] unless start_ref.to_s.match?(/\A\d+\z/) &&
end_ref.to_s.match?(/\A\d+\z/)
a, b = start_ref.to_i, end_ref.to_i
return [nil, nil] unless (a - b).abs == 1
lo, hi = [a, b].minmax
forward = a < b
earlier = forward ? [lo - 1, lo] : [lo, lo - 1]
later = forward ? [hi, hi + 1] : [hi + 1, hi]
[earlier, later].map do |pair|
pair if pair.all? { |rev| node.pages.exists?(:revision => rev) }
end
end
end
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