parkr · October 20, 2017 15:37 · Oct 20, 2017
diff --git a/jekyll_6364.rb b/jekyll_6364.rb
@@ -0,0 +1,84 @@
+# This is a possible alternate solution to Jekyll #6364.
+# All of these procs are translations of methods from Jekyll::Filters.
+# Only item_property has been modified.
+
+require "liquid"
+
+input = { "government" => ["one post", "two post"], "tech" => ["three post"], "lol" => [1,2,3] }
+
+as_liquid = -> (item) {
+  case item
+  when Hash
+    pairs = item.map { |k, v| as_liquid.([k, v]) }
+    Hash[pairs]
+  when Array
+    item.map { |i| as_liquid.(i) }
+  else
+    if item.respond_to?(:to_liquid)
+      liquidated = item.to_liquid
+      # prevent infinite recursion for simple types (which return `self`)
+      if liquidated == item
+        item
+      else
+        as_liquid.(liquidated)
+      end
+    else
+      item
+    end
+  end
+}
+
+item_property = -> (item, property) {
+  if item.respond_to?(:to_liquid)
+    property.to_s.split(".").reduce(item.to_liquid) do |subvalue, attribute|
+      p attribute
+      liquid = as_liquid.(subvalue)
+      liquid.respond_to?(attribute) ? liquid.public_send(attribute) : liquid[attribute]
+    end
+  elsif item.respond_to?(:data)
+    item.data[property.to_s]
+  else
+    item[property.to_s]
+  end
+}
+
+sort_input = -> (input, property, order) {
+  interim = input.map { |item| [item_property.(item, property), item] }
+  p interim
+  interim.sort! do |apple_info, orange_info|
+      apple_property = apple_info.first
+      orange_property = orange_info.first
+
+      if !apple_property.nil? && orange_property.nil?
+        - order
+      elsif apple_property.nil? && !orange_property.nil?
+        + order
+      else
+        apple_property <=> orange_property
+      end
+    end
+    .map!(&:last)
+}
+
+sort = -> (input, property = nil, nils = "first") {
+  if input.nil?
+    raise ArgumentError, "Cannot sort a null object."
+  end
+  if property.nil?
+    input.sort
+  else
+    if nils == "first"
+      order = - 1
+    elsif nils == "last"
+      order = + 1
+    else
+      raise ArgumentError, "Invalid nils order: " \
+        "'#{nils}' is not a valid nils order. It must be 'first' or 'last'."
+    end
+
+    sort_input.(input, property, order)
+  end
+}
+
+p input
+p sort.(input, "last.length")