class Lookbook::ListResolver

def call(&resolver)
  included = to_include.inject([]) do |result, name|
    if name == "*"
      result += item_set.select { |item| !result.include?(item) }
    elsif item_set.include?(name)
      result << name
    end
    result
  end
  resolved = resolver ? included.map { |item| resolver.call(item) } : included
  resolved.compact
end

def initialize(to_include = nil, item_set = nil)
  @to_include = to_include
  @item_set = Array(item_set).compact.uniq.map(&:to_s)
end

def to_include
  case @to_include
  when true
    ["*"]
  when false
    []
  else
    Array(@to_include).compact.uniq.map(&:to_s)
  end
end