Get a printed list of components in Sketchup

gistfile1.rb

class ComponentListExtractor
  attr_reader :components
  
  def initialize
    @components = find_components.freeze
  end
  
  def to_s
    String.new.tap do |out|
      components.each do |name, component|
        out << "#{component[:count]}x #{name} (#{component[:dimensions].join('" x ')}\")\n"
      end
    end
  end
  
  private
  
  def find_components
    {}.tap do |components|
      component_entities.each do |entity|
        components[entity.definition.name] ||= {
          count: 0,
          dimensions: entity.scaled_size,
          instances: []
        }
        components[entity.definition.name][:count] += 1
        components[entity.definition.name][:instances] << entity
      end
    end
  end
  
  def component_entities
    entities.map do |entity|
      entity if entity.typename == "ComponentInstance"
    end.compact
  end
  
  def entities
    model.entities
  end
  
  def model
    Sketchup.active_model
  end
end

list = ComponentListExtractor.new
list.to_s