The Flog score of your Rails ERB templates.

contemplative.rb

require 'action_view'
require 'ostruct'
require 'erb'
require 'flog'
require 'ruby_parser'
require 'sexp_processor'

ERBHandler = ActionView::Template::Handlers::ERB.new

def new_template(body, details={format: :html})
  ActionView::Template.new(body, "irrelevant", details.fetch(:handler) {ERBHandler}, details)
end

def sort_by_combined_score(totals)
  totals.sort do |a, b|
    b[1].values.inject(&:+) <=> a[1].values.inject(&:+)
  end
end

if $0 == __FILE__
  src_dir = ARGV[0]
  raise ArgumentError, "Supply a path containing ERB templates" unless src_dir

  puts "Contemplating ERB templates from: #{src_dir}"

  erb_files = Dir.glob(File.join(src_dir, "**/*.erb"))

  totals = erb_files.inject({}) do |totals, file|
    erb_source = File.read(file)
    ruby_source = ERBHandler.call(new_template(erb_source))
    sexp_parsed = RubyParser.new.parse(ruby_source)

    flog = Flog.new
    flog.process(sexp_parsed)

    totals[file] = flog.totals
    totals
  end

  sort_by_combined_score(totals).each do |filename, totals|
    puts "#{filename} : #{totals}"
  end

end

Anybody know how to get the ruby source from a haml file? I've spent a bit of time on this already but couldn't figure it out. It'd be cool to run this against ERB and then again after converting to HAML and refactoring.