Little script using mruby to compile to self-executable

compile.rb

#!/usr/bin/env ruby

class Compiler
  def initialize
    @mruby_dir = '/Users/shannonskipper/.rubies/mruby'
    sanity_check_argv
    @file = ARGV.first.sub /.rb$/, ''
  end
  
  def run
    create_binary_c_code_array
    wrap_binary_c_code_array
    compile_and_link
  end
  
  private
  def sanity_check_argv
    if ARGV.empty?
      abort 'Pass the .rb file do you want to compile as an arguement.'
    end
    
    unless ARGV.first =~ /.rb$/
      abort 'The @file you are compiling must be a .rb file.'
    end
  end
  
  def create_binary_c_code_array
    `#{@mruby_dir}/bin/mrbc -B#{@file} #{@file}.rb`
  end
  
  def wrap_binary_c_code_array
    File.open "./#{@file}.c", 'a' do |file|
      file << <<-eos
      #include "#{@mruby_dir}/include/mruby.h"
      #include "#{@mruby_dir}/include/mruby/irep.h"
      #include "#{@mruby_dir}/include/mruby/proc.h"
    
      int
      main(void)
      {
        mrb_state *mrb;
        mrb = mrb_open();
        int n = mrb_read_irep(mrb, #{@file});
        mrb_run(mrb, mrb_proc_new(mrb, mrb->irep[n]), mrb_top_self(mrb));
        mrb_close(mrb);
        return 0;
      }
      eos
    end
  end
  
  def compile_and_link
    `gcc -I#{@mruby_dir}/mruby/src -I#{@mruby_dir}/include -c #{@file}.c -o #{@file}.o`
    `gcc -o #{@file} #{@file}.o #{@mruby_dir}/build/host/lib/libmruby.a`
  end
end

Compiler.new.run