Convert proc scopes to stabby lambda scopes

proc_fix.rb

# USAGE: ruby proc_fix.rb <one or more space-separated model names without path or extension>
# e.g. ruby proc_fix.rb activity
# e.g. ruby proc_fix.rb accessory bill_charge
# **Must be run in Rail's root**
# What it do: Converts all "Proc.new { |foo|" to "(foo) -> {"

before = /scope(.*)Proc\.new\s*\{\s*\|(.*)\|/
after  = 'scope\1->(\2) {'

ARGV.each do |modelname|
  filename = "app/models/#{modelname}.rb"
  contents = File.read(filename)
  fixed_contents = contents.gsub(before, after)
  File.write(filename, fixed_contents)
end