this jekyll site's _plugins

this page is generated by the plugin source below:

no_date.rb

# https://stackoverflow.com/a/68287682
class Jekyll::PostReader
  # monkey patch `Jekyll::PostReader::read_posts` so we don't have to write the
  # date in the post filename
  #
  # see the jekyll source
  def read_posts(dir)
    read_publishable(dir, "_posts", Jekyll::Document::DATELESS_FILENAME_MATCHER)
  end
end

hook-jekyll-version.rb

# variables I want in my posts
# (I wish I could write the ruby directly in the page sources.)
Jekyll::Hooks.register :site, :after_init do |site|
  site.config['ruby-version'] = RUBY_DESCRIPTION
  site.config['jekyll-version'] = Gem.loaded_specs['jekyll'].version.version
end

hook-_plugins.rb

# automatically build the content about this site's _plugins
Jekyll::Hooks.register :site, :after_init do |site|
  acc = []
  Dir.each_child("_plugins"){ |filename|
    acc.push("## #{filename}\n#{(File.readlines(File.join("_plugins", filename)).map {|line| "    #{line}"}).join()}\n")
  }
  site.config['about-_plugins'] = "this page is generated by the plugin source below:\n#{acc.join()}"
end