template.java.erb

// THIS DOESN'T Come through
<%= @model %>

public class <%= 3 + 4 %> {
	private int id;
	private string email;
	private string first;
	private string lastname;
}

thing.rb

require 'erb'
require 'json'
require 'fileutils'

GEN_DIRS = ['gen', 'gen/models', 'gen/controllers']

FileUtils::rm_rf GEN_DIRS[0]
FileUtils.mkdir_p GEN_DIRS


class Renderer < OpenStruct
  def self.render_from_hash(t, h)
    Renderer.new(h).render(t)
  end

  def render(template)
    ERB.new(template).result(binding)
  end
end

class Generator
	
	def initialize(argv)
		@argv = argv
	end
	
	def generate_model()
		model_template = File.read('templates/src/Model.java.erb')
		model = {}
		model[:name] = @argv.slice!(0)
		model[:fields] = @argv.map{|a| { name: a.split(':')[0], data_type: a.split(':')[1] } }
		out_file = File.new(GEN_DIRS[1] + '/' + model[:name] + '.java','w+')
		out_file.write(Renderer::render_from_hash(model_template, model))
	end

end

ARGV << 'help' if ARGV.empty?

command = ARGV.shift

if command == 'model'
	puts 'model'
	g = Generator.new(ARGV)
	g.generate_model
elsif command == 'controller'
	puts 'controller'
elsif command == 'scaffold'
	puts 'scaffold'
else
	puts 'help'
end