meta_csv.rb

#SCRIPT TO CREATE CLASSES AND METHODS DYNAMICALLLY ON THE BASIS OF CSV FILE 

def check_usage
	unless ARGV.length ==1 
		puts "Usage: You must input some file in csv format."
		exit
	end
end
#---------------------------------------------------------------------------------

def read_filename
	@filename = ARGV[0]
	@klass = File.basename(@filename, '.csv')
	@klass.capitalize!
	@klass = @klass.intern
end

#---------------------------------------------------------------------------------	
def make_class
	puts "The class name is " << @klass.to_s
	Object::const_set(@klass, Class::new {
	
		 def self.start_process(file_to_read)
			 fobject         = File.readlines(file_to_read)
			 properties = fobject.first.chomp.split(",") #THE FIRST LINE MUST CONTAIN PROPERTIES OF THE OBJECT THAT WE HAVE TO MAKE
			 self.class_eval do
				 define_method "initialize" do |*args|
						args  = args[0].split(",")
					
						 unless properties.length == args.length
							puts "\nInvalid Arguments, #{ properties.length } required, you supplied #{ args.length } !!\n"
							exit
						 end
						
						 args.each_with_index do |arg, i|
						   instance_variable_set("@"+ properties[i].strip, arg)
					   end
					 
				end
			 end
			
			 properties.each do |property|
				 class_eval do
					 define_method "#{ property.intern }" do
						 instance_variable_get("@"+ property.strip)
					 end
				 end
			 end
		 end
		 
	}
)
end

#---------------------------------------------------------------------------------

def current_class
	Object::const_get(@klass)
end
#---------------------------------------------------------------------------------

def make_methods
	current_class.start_process(@filename)
end
#---------------------------------------------------------------------------------

def retrive_data
	fobject         = File.readlines(@filename)
	@collection     = Array.new
	methods_available = current_class.instance_methods(false)
	puts "Methods:"
	puts "-"*80
	methods_available.each  do |m|
		print m, " "
	end
	print "\n"
	puts "-"*80
	for i in 1..fobject.length-1
		str = fobject[i].chop
		obj = current_class.new(str)
		@collection << obj
	end
	puts "Here is the collection"
	
	@collection.each_with_index do |collection, i|
		print "-"*80, "\n\n"
		p "collection[#{i}]"
		p collection
		
		methods_available.each do |method|
			print "collection[#{i}].#{method.to_s.strip} =  #{ collection.send(method) } \n"
			
			
		end
		print "\n"
	end
	print "-"*80, "\n"
	
end
#---------------------------------------------------------------------------------
check_usage
read_filename
make_class
make_methods
retrive_data