Script used while upgrading from Rails 2 to Rails 3/4

fix_amp_eq.rb

dir = ARGV[0]

raise "Usage: #{$0} <DIR>" if dir.nil?

Dir[File.join(dir, '**/*.haml')].each do |f|

  s = File.read(f)
  lines = []
  s.each_line do |l|
    l = l.gsub('&=', '=')
    lines << l
  end
  File.open(f, 'w') { |f| f.write(lines.join('')) }
end
~       

upgrade_rails_forms.rb

require 'json'

dir = ARGV[0]

raise "Usage: #{$0} <DIR>" if dir.nil?

Dir[File.join(dir, '**/*.haml')].each do |f|

  s = File.read(f)
  lines = []
  s.each_line do |l|

    # get rid of parens e.g. form_for(..)
    l = l.sub(/form_for\(([^\)]+)\)/, 'form_for \1')

    if l.include?('- form_for ')
      puts l

      md = l.match(/^(\s*)-\s*form_for\s+(.*)do(.*)$/)

      indentation, args_and_opts, blockargs = md.captures

      if (md = args_and_opts.match(/(.*?),\s*(\S+\s*=>.*)/))
        args, opts = md.captures
      else
        args, opts = args_and_opts, nil
      end

      #puts "args: #{args} opts: #{opts}"

      if opts
        if opts.include?('method')
          md = opts.match(/(.method[^,\}]+)/)
          method = md[1]
          opts.sub!(method, '')
          opts.sub!(/.html.?\s*=>\s*\{\s*\}/, '')
          opts.sub!(/,\s*$/, '') # e.g. :url => user_rates_path(@user),
          opts.sub!(/^\s*,\s*/, '')
          #puts "method: #{method} opts: #{opts}"
        end

        opts.sub!(/\{[, ]*/, '{ ') # e.g. :html => { , :multipart => true }
        opts.sub!(/[, ]*\}/, ' }') # :html => { :id => 'editScheduleForm', })
      else
        method = nil
      end

      args = args.split(',').map(&:strip)
      if args.size == 2
        name, object = args[0], args[1]
        args[0] = object
        args[1] = ":as => #{name}"
      end

      #puts "args: #{args.inspect} opts: #{opts.inspect}"

      parts = ["#{indentation}= form_for #{args.join(', ')}"]
      parts << method.strip unless method.nil?
      parts << opts.strip unless opts.nil?

      #puts "parts: #{parts.inspect}"
      replacement_line = "#{parts.join(', ')} do #{blockargs.strip}\n"

      puts replacement_line

      lines << replacement_line
    else
      l.sub!('- form_tag', '= form_tag')
      l.sub!(/- (\S*)fields_for /, '= \1fields_for ')
      lines << l
    end
  end
  File.open(f, 'w') { |f| f.write(lines.join('')) }
end