genclass.rake

desc 'generate a class in lib/ and a spec in spec/lib/ for name=underscored_class_name'
task :genclass do
  require 'erb'

  filename = ENV['name']
  raise 'must specify name=underscored_class_name' unless filename
  classname = filename.camelize

  class_file_template = ERB.new <<-EOF
class <%= classname %>

  def something
  end
end
EOF

  spec_file_template = ERB.new <<-EOF
require 'spec_helper'

describe <%= classname %> do

  before do
    @target = <%= classname %>.new
  end

  describe '#something' do
    it "should do something"
  end
end
EOF

  [
    ["lib/#{filename}.rb",           class_file_template],
    ["spec/lib/#{filename}_spec.rb", spec_file_template]
  ].each do |(fname, template)|
    if File.exists?(fname)
      puts "skipping generation of existing file - #{fname}"
    else
      puts "generating #{fname}"
      File.open(fname, 'w+') do |f|
        f.write template.result(binding)
        f.flush
      end
    end
  end
end