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The Flog score of your Rails ERB templates.
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
@jamesmartin

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jamesmartin commented Jan 18, 2013

Run it like this:
ruby contemplative.rb /path/to/your/rails/app/

Get output like this (templates sorted by Flog score):

foo/app/views/walruses/edit.html.erb : {"main#none"=>54.5979853108153, "some#method"=>7.593418202627854}
foo/app/views/walruses/new.html.erb : {"main#none"=>26.214690537940754}
foo/app/views/walruses/about.html.erb : {"main#none"=>3.830143600441112}
@lukeholder

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lukeholder commented Jan 18, 2013

Keep in mind that templates can have multiple extension.

The order of these preprocessors is important. For example, if you called your JavaScript file app/assets/javascripts/projects.js.erb.coffee then it would be processed with the CoffeeScript interpreter first, which wouldn’t understand ERB and therefore you would run into problems.

@benjaminwood

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benjaminwood commented Mar 24, 2014

Thanks for this. With the latest version of flog you need to call flog.calculate_total_scores before calling flog.totals. See here: http://docs.seattlerb.org/flog/Flog.html#method-i-calculate_total_scores

I've add the line in the fork here: https://gist.github.com/benjaminwood/9744892

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benjaminwood commented Mar 24, 2014

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.

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