lib/nanoc/helpers/breadcrumbs.rb in nanoc-4.8.17 vs lib/nanoc/helpers/breadcrumbs.rb in nanoc-4.8.18

@@ -1,10 +1,38 @@
 # frozen_string_literal: true
 
 module Nanoc::Helpers
   # @see http://nanoc.ws/doc/reference/helpers/#breadcrumbs
   module Breadcrumbs
+    # @api private
+    module Int
+      # e.g. unfold(10.class, &:superclass)
+      # => [Integer, Numeric, Object, BasicObject]
+      def self.unfold(obj, &blk)
+        acc = [obj]
+
+        res = yield(obj)
+        if res
+          acc + unfold(res, &blk)
+        else
+          acc
+        end
+      end
+
+      # e.g. patterns_for_prefix('/foo/1.0')
+      # => ['/foo/1.0.*', '/foo/1.*']
+      def self.patterns_for_prefix(prefix)
+        prefixes =
+          unfold(prefix) do |old_prefix|
+            new_prefix = Nanoc::Identifier.new(old_prefix).without_ext
+            new_prefix == old_prefix ? nil : new_prefix
+          end
+
+        prefixes.map { |pr| pr + '.*' }
+      end
+    end
+
     # @return [Array]
     def breadcrumbs_trail
       # e.g. ['', '/foo', '/foo/bar']
       components = item.identifier.components
       prefixes = components.inject(['']) { |acc, elem| acc + [acc.last + '/' + elem] }
@@ -16,10 +44,11 @@
           .reject { |pr| pr =~ /^\/index\./ }
           .map do |pr|
             if pr == ''
               @items['/index.*']
             else
-              @items[Nanoc::Identifier.new(pr).without_ext + '.*']
+              prefix_patterns = Int.patterns_for_prefix(pr)
+              prefix_patterns.lazy.map { |pat| @items[pat] }.find(&:itself)
             end
           end
       end
     end
   end