module ActiveRecord
  class Migration
    class << self
      def renumber(migrations_path, current_version, target_version)
        self.new(current_version > target_version ? :up : :down, migrations_path, target_version).renumber(current_version)
      end
    end
  end
  
  class Migrator#:nodoc:
    class << self
      def renumber(migrations_path, current_version, target_version)
        self.new(current_version > target_version ? :up : :down, migrations_path, target_version).renumber(current_version)
      end
    end
    
    def renumber(current_version)
      migration_files.each do |migration_file|
        version, name = migration_version_and_name(migration_file)
        if version.to_i >= current_version
          svn_status = `svn status -v #{migration_file}`
          move = (svn_status.blank? || svn_status =~ /^\?/) ? 'mv' : 'svn mv'
          new_version = version.to_i + (@target_version - current_version)
          new_filename = File.join(@migrations_path, "#{new_version}_#{name}.rb")
          
          system  "#{move} #{migration_file} #{new_filename}"
          puts    "==  Migration Renumbered: Moving #{version}_#{name} to #{new_version}_#{name}"
        end
      end
    end
  end
end