Gem rewrite with spec. There's one test left to get passing.

Gemfile

@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in slugtastic.gemspec
+gemspec

Gemfile.lock

@@ -0,0 +1,34 @@
+PATH
+  remote: .
+  specs:
+    slugtastic (0.2.0.alpha)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (3.0.17)
+      activesupport (= 3.0.17)
+      builder (~> 2.1.2)
+      i18n (~> 0.5.0)
+    activesupport (3.0.17)
+    builder (2.1.2)
+    diff-lcs (1.1.3)
+    i18n (0.5.0)
+    rspec (2.11.0)
+      rspec-core (~> 2.11.0)
+      rspec-expectations (~> 2.11.0)
+      rspec-mocks (~> 2.11.0)
+    rspec-core (2.11.1)
+    rspec-expectations (2.11.2)
+      diff-lcs (~> 1.1.3)
+    rspec-mocks (2.11.2)
+    supermodel (0.1.6)
+      activemodel (~> 3.0.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rspec
+  slugtastic!
+  supermodel

LICENSE

@@ -0,0 +1,22 @@
+Copyright (c) 2012 Dan Barber
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Manifest

@@ -1,5 +0,0 @@
-Manifest
-README.md
-Rakefile
-lib/slugtastic.rb
-slugtastic.gemspec

README.md

@@ -1,15 +1,20 @@
-Slugtastic
-==========
+# Slugtastic
 
 Simple gem for autogenerating permalink style slugs for your ActiveRecord models.
 
-## Install
+## Installation
 
-Add this to your Gemfile:
+Add this line to your application's Gemfile:
 
-    gem "slugtastic"
+    gem 'slugtastic'
 
-And run `bundle install`
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install slugtastic
 
 ## Usage
 
@@ -19,4 +24,12 @@ Usage is very simple. Just add the following to your model:
 
 This will generate a slug string from the title atrribute and store it in the slug attribute unless the slug already contains a string. The slug is generated pre-validation so you can still use `validates_presence_of :slug`.
 
-There are no extra options at present.
+There are no extra options at present.
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Added some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request

Rakefile

@@ -1,14 +1,7 @@
-require 'rubygems'
-require 'rake'
-require 'echoe'
+#!/usr/bin/env rake
+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
 
-Echoe.new('slugtastic', '0.1.2') do |p|
-  p.description    = "A simple slug string generator for ActiveRecord. Will populate a slug attribute from another attribute."
-  p.url            = "http://github.com/danbee/slugtastic"
-  p.author         = "Dan Barber"
-  p.email          = "danbee@gmail.com"
-  p.ignore_pattern = ["tmp/*", "script/*"]
-  p.development_dependencies = []
-end
+RSpec::Core::RakeTask.new(:spec)
 
-Dir["#{File.dirname(__FILE__)}/tasks/*.rake"].sort.each { |ext| load ext }
+task default: :spec

lib/slugtastic.rb

@@ -1,23 +1,8 @@
+require "slugtastic/version"
+require "slugtastic/model_additions"
+
 module Slugtastic
-  def self.included(base)
-    base.extend ClassMethods
-  end
-  
-  def generate_slug(string)
+  def self.generate_slug(string)
     string.downcase.gsub(/ /, '_').gsub(/[^a-z0-9\-_]/, '') unless string.nil?
   end
-
-  module ClassMethods
-
-    def has_slug(name, options = { :from => :title })
-      before_validation do |record|
-        self[name] = generate_slug(self[options[:from]]) if self[name].nil? or self[name].empty?
-      end
-    end
-
-  end
 end
-
-class ActiveRecord::Base
-  include Slugtastic
-end

lib/slugtastic/model_additions.rb

@@ -0,0 +1,12 @@
+module Slugtastic
+  module ModelAdditions
+
+    def has_slug name, options = { :from => :title }
+      before_validation do |record|
+        return if responds_to?(name) and send(name).present?
+        send("#{name}=", Slugtastic.generate_slug(send(options[:from])))
+      end
+    end
+
+  end
+end

lib/slugtastic/version.rb

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+module Slugtastic
+  VERSION = "0.2.0.alpha"
+end

slugtastic.gemspec

@@ -1,29 +1,20 @@
 # -*- encoding: utf-8 -*-
+require File.expand_path('../lib/slugtastic/version', __FILE__)
 
-Gem::Specification.new do |s|
-  s.name = %q{slugtastic}
-  s.version = "0.1.2"
+Gem::Specification.new do |gem|
+  gem.authors       = ["Dan Barber"]
+  gem.email         = ["danbee@gmail.com"]
+  gem.description   = %q{A simple slug string generator for ActiveRecord. Will populate a slug attribute from another attribute.}
+  gem.summary       = %q{A simple slug string generator for ActiveRecord.}
+  gem.homepage      = ""
 
-  s.required_rubygems_version = Gem::Requirement.new(">= 1.2") if s.respond_to? :required_rubygems_version=
-  s.authors = [%q{Dan Barber}]
-  s.date = %q{2011-10-08}
-  s.description = %q{A simple slug string generator for ActiveRecord. Will populate a slug attribute from another attribute.}
-  s.email = %q{danbee@gmail.com}
-  s.extra_rdoc_files = [%q{README.md}, %q{lib/slugtastic.rb}]
-  s.files = [%q{Manifest}, %q{README.md}, %q{Rakefile}, %q{lib/slugtastic.rb}, %q{slugtastic.gemspec}]
-  s.homepage = %q{http://github.com/danbee/slugtastic}
-  s.rdoc_options = [%q{--line-numbers}, %q{--inline-source}, %q{--title}, %q{Slugtastic}, %q{--main}, %q{README.md}]
-  s.require_paths = [%q{lib}]
-  s.rubyforge_project = %q{slugtastic}
-  s.rubygems_version = %q{1.8.6}
-  s.summary = %q{A simple slug string generator for ActiveRecord. Will populate a slug attribute from another attribute.}
+  gem.files         = `git ls-files`.split($\)
+  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
+  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
+  gem.name          = "slugtastic"
+  gem.require_paths = ["lib"]
+  gem.version       = Slugtastic::VERSION
 
-  if s.respond_to? :specification_version then
-    s.specification_version = 3
-
-    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-    else
-    end
-  else
-  end
+  gem.add_development_dependency "rspec"
+  gem.add_development_dependency "supermodel"
 end

spec/slugtastic/model_additions_spec.rb

@@ -0,0 +1,23 @@
+# encoding: utf-8
+require 'spec_helper'
+
+class Model < SuperModel::Base
+  include ActiveModel::Validations::Callbacks
+  extend Slugtastic::ModelAdditions
+  has_slug :slug, from: :title
+end
+
+describe Slugtastic::ModelAdditions do
+  it "generates a slug from the title" do
+    Model.create!(:title => "A Simple Title").slug.should eq "a_simple_title"
+  end
+
+  it "doesn't regenerate the slug if it already exists" do
+    model = Model.create!(:title => "A Simple Title")
+    model.slug.should eq "a_simple_title"
+
+    model.title = "A new title"
+    model.save
+    model.slug.should eq "a_simple_title"
+  end
+end

spec/slugtastic_spec.rb

@@ -0,0 +1,18 @@
+# encoding: utf-8
+require 'spec_helper'
+
+describe Slugtastic do
+  describe ".generate_slug" do
+    it "generates a slug from a simple string" do
+      Slugtastic.generate_slug("A simple string.").should eq "a_simple_string"
+    end
+
+    it "handles strings with hypens in them" do
+      Slugtastic.generate_slug("A string - with Hyphens").should eq "a_string_-_with_hyphens"
+    end
+
+    it "handles strings with other characters in them" do
+      Slugtastic.generate_slug("A string, with /All sorts!").should eq "a_string_with_all_sorts"
+    end
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1,2 @@
+require "slugtastic"
+require "supermodel"