Just want to expand some values into static files - not a "blog engine". This is already overkilll

build_it.rb

#!/usr/bin/ruby
require 'erb'
require 'json'
require 'yaml'
require 'fileutils'

@from = ARGV.shift || 'files'
@to = ARGV.shift || 'dist'

# definitions
class Hash
  @@warn = false;

  def self.warn(setting)
    @@warn = setting
  end

  def method_missing(method_sym, *arguments)
    puts "Missing #{method_sym}" if @@warn
    if method_sym.to_s[-1] == "="
      self[method_sym[0..-2].to_sym] = arguments.first
    else
      self[method_sym] || self[method_sym.to_s]
    end
  end

end

def vars
  @vars ||= Hash.new()
end


# filesystem
def rebase(file)
  file.gsub(/^#{@from}/, @to)
end
def glob(extension = '*')
  Dir.glob(File.join(@from, '**', extension))
end
def path(file)
  File.dirname(file).gsub(/^#{@from}/, '')
end
def writable(file)
  FileUtils.mkdir_p(File.dirname(file))
  if block_given?
    File.open(file, 'w') {|f| yield f}
  end
end
done = {}

# require .rb
glob('*.rb').each do |file|
  puts "requiring #{file}"
  require './' + file
  done[file] = 1
end

# load variables from yaml or json
glob('*.yaml').each do |file|
  puts "loading #{file}"
  vars.merge!(YAML.load(File.read(file)))
  done[file] = 1
end
glob('*.json').each do |file|
  puts "parsing #{file}"
  vars.merge!(JSON.parse(File.read(file)))
  done[file] = 1
end

Hash.warn(true)

# process templates
Dir.glob(File.join(@from, '**', '*.erb')).each do |file|
  puts "expanding #{file}"
  new_file = rebase(file).gsub(/\.erb$/, '')
  if File.extname(new_file) == ""
    new_file = new_file + '/index.html'
  end
  writable(new_file) {|f| f.write(ERB.new(File.read(file)).result())}
  done[file] = 1
end
# maybe todo: Markdown over erb (but then I almost built jekyll)
# this works ok - store post in yaml....

# copy remaining files
glob.reject {|file| done[file]}.each do |file|
  unless File.directory?(file)
    puts "copying #{file}"
    writable(rebase(file)) {|f| f.write(File.read(file))}
  end
end