Adding simple devise generator to create a model, migration and route.

generators/devise/USAGE

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+script/generate devise User

generators/devise/devise_generator.rb

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+require File.expand_path(File.dirname(__FILE__) + "/lib/route_devise.rb")
+
+class DeviseGenerator < Rails::Generator::NamedBase
+
+  def manifest
+    record do |m|
+      # Check for class naming collisions.
+      m.class_collisions(class_name)
+
+      # Model
+      m.directory(File.join('app', 'models', class_path))
+      m.template 'model.rb', File.join('app', 'models', "#{file_path}.rb")
+
+      # Migration
+      m.migration_template 'migration.rb', 'db/migrate', :migration_file_name => "devise_create_#{table_name}"
+
+      # Routing
+      m.route_devise table_name
+
+      # Readme
+      m.readme "README"
+    end
+  end
+
+end

generators/devise/lib/route_devise.rb

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+module Rails
+  module Generator
+    module Commands
+      class Create < Base
+
+        # Create devise route. Based on route_resources
+        def route_devise(*resources)
+          resource_list = resources.map { |r| r.to_sym.inspect }.join(', ')
+          sentinel = 'ActionController::Routing::Routes.draw do |map|'
+
+          logger.route "map.devise_for #{resource_list}"
+          unless options[:pretend]
+            gsub_file 'config/routes.rb', /(#{Regexp.escape(sentinel)})/mi do |match|
+              "#{match}\n  map.devise_for #{resource_list}\n"
+            end
+          end
+        end
+      end
+
+      class Destroy < RewindBase
+
+        # Destroy devise route. Based on route_resources
+        def route_devise(*resources)
+          resource_list = resources.map { |r| r.to_sym.inspect }.join(', ')
+          look_for = "\n  map.devise_for #{resource_list}\n"
+          logger.route "map.devise_for #{resource_list}"
+          gsub_file 'config/routes.rb', /(#{look_for})/mi, ''
+        end
+      end
+    end
+  end
+end

generators/devise/templates/README

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+
+================================================================================
+
+Some setup you must do manually if you haven't yet:
+
+1. Setup defaut url options for your specific environment. Here is an example of development environment:
+
+    config.action_mailer.default_url_options = { :host => 'localhost:3000' }
+
+It's a Rails required configuration.
+In production it must be the actual host your application is deployed to.
+
+2. Setup default sender for mails.In config/environment.rb:
+
+    Notifier.sender = "test@example.com"
+
+3. Ensure you have defined root_url to *something* in your config/routes.rb:
+
+    map.root :controller => 'home'
+
+================================================================================

generators/devise/templates/migration.rb

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+class DeviseCreate<%= table_name.camelize %> < ActiveRecord::Migration
+  def self.up
+    create_table(:<%= table_name %>) do |t|
+      t.authenticable
+      t.confirmable
+      t.recoverable
+      t.rememberable
+
+      t.timestamps
+    end
+
+    add_index :<%= table_name %>, :email,                :unique => true
+    add_index :<%= table_name %>, :confirmation_token,   :unique => true
+    add_index :<%= table_name %>, :reset_password_token, :unique => true
+  end
+
+  def self.down
+    drop_table :<%= table_name %>
+  end
+end

generators/devise/templates/model.rb

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+class <%= class_name %> < ActiveRecord::Base
+  devise :all
+  # Setup accessible (or protected) attributes for your model
+  attr_accessible :email, :password, :password_confirmation
+end