make it to work well with Sinatra/Padrino, thanks to #161 & #174

kaminari.gemspec

@@ -21,9 +21,14 @@ Gem::Specification.new do |s|
 
   s.licenses = ['MIT']
 
-  s.add_dependency 'railties', ['>= 3.0.0']
+  %w{ activesupport actionpack railties }.each do |gem|
+    s.add_dependency gem, ['>= 3.0.0']
+  end
   s.add_development_dependency 'bundler', ['>= 1.0.0']
   s.add_development_dependency 'sqlite3', ['>= 0']
+  %w{ activerecord activemodel }.each do |gem|
+    s.add_development_dependency gem, ['>= 3.0.0']
+  end
   s.add_development_dependency 'mongoid', ['>= 2']
   s.add_development_dependency 'mongo_mapper', ['>= 0.9']
   s.add_development_dependency 'dm-core', ['>= 1.1.0']

lib/kaminari.rb

@@ -1,2 +1,52 @@
-require 'kaminari/railtie'
-require 'kaminari/engine'
+module Kaminari
+
+  def self.frameworks
+    frameworks = []
+    case
+      when defined?(::Rails)   then frameworks << 'rails'
+      when defined?(::Sinatra) then frameworks << 'sinatra/base'
+    end
+    frameworks
+  end
+
+  def self.load_framework!
+    raise "No framework specified!" if frameworks.empty?
+    frameworks.each do |framework|
+      begin
+        require framework
+      rescue NameError => e
+        raise "can\'t load framework #{framework.inspect}. Have you added it to Gemfile?"
+      end
+    end
+  end
+
+
+  def self.load_kaminari!
+    require 'kaminari/config'
+    require 'kaminari/helpers/action_view_extension'
+    require 'kaminari/helpers/paginator'
+    require 'kaminari/models/page_scope_methods'
+    require 'kaminari/models/configuration_methods'
+  end
+
+  def self.hook!
+    load_framework!
+    load_kaminari!
+    require 'kaminari/hooks'
+    if defined?(::Rails)
+      require 'kaminari/railtie'
+      require 'kaminari/engine'
+    elsif defined?(::Sinatra)
+      require 'kaminari/sinatra'
+    else
+      Kaminari::Hooks.init!
+    end
+  end
+
+  def self.load!
+    hook!
+  end
+
+end
+
+Kaminari.load!

lib/kaminari/helpers/paginator.rb

@@ -1,5 +1,8 @@
-require 'kaminari/helpers/tags'
+require 'active_support/inflector'
+require 'action_view'
+require 'action_view/log_subscriber'
 require 'action_view/context'
+require 'kaminari/helpers/tags'
 
 module Kaminari
   module Helpers

lib/kaminari/helpers/sinatra_helper.rb

@@ -0,0 +1,126 @@
+require 'active_support/core_ext/object'
+require 'active_support/core_ext/string'
+
+begin
+
+require 'padrino-helpers'
+module Kaminari::Helpers
+  module SinatraHelper
+    class << self
+      def registered(app)
+        app.register Padrino::Helpers
+        app.helpers  HelperMethods
+      end
+
+      alias included registered
+    end
+    
+    class ActionViewTemplateProxy
+      def initialize(opts={})
+        @current_path = opts[:current_path]
+        @param_name = (opts[:param_name] || :page).to_sym
+        @current_params = opts[:current_params]
+        @current_params.delete(@param_name)
+      end
+
+      def render(*args)
+        base = ActionView::Base.new.tap do |a|
+          a.view_paths << File.expand_path('../../../../app/views', __FILE__)
+        end
+        base.render(*args)
+      end
+
+      def url_for(params)
+        extra_params = {}
+        if page = params[@param_name] and page != 1
+          extra_params[@param_name] = page
+        end
+        query = @current_params.merge(extra_params)
+        @current_path + (query.empty? ? '' : "?#{query.to_query}")
+      end
+      
+      def params
+        @current_params
+      end
+    end
+  
+    module HelperMethods
+      # A quick backport from Rails' link_to_unless helper
+      def link_to_unless(condition, *args, &blk)
+        unless condition
+          link_to *args 
+        else
+          block_given? ? blk.call : nil
+        end
+      end
+    
+      # A helper that renders the pagination links - for Sinatra.
+      #
+      #   <%= paginate @articles %>
+      #
+      # ==== Options
+      # * <tt>:window</tt> - The "inner window" size (4 by default).
+      # * <tt>:outer_window</tt> - The "outer window" size (0 by default).
+      # * <tt>:left</tt> - The "left outer window" size (0 by default).
+      # * <tt>:right</tt> - The "right outer window" size (0 by default).
+      # * <tt>:params</tt> - url_for parameters for the links (:controller, :action, etc.)
+      # * <tt>:param_name</tt> - parameter name for page number in the links (:page by default)
+      # * <tt>:remote</tt> - Ajax? (false by default)
+      # * <tt>:ANY_OTHER_VALUES</tt> - Any other hash key & values would be directly passed into each tag as :locals value.
+      def paginate(scope, options = {}, &block)
+        current_path = env['PATH_INFO'] rescue nil
+        current_params = Rack::Utils.parse_query(env['QUERY_STRING']).symbolize_keys rescue {}
+        paginator = Kaminari::Helpers::Paginator.new(
+          ActionViewTemplateProxy.new(:current_params => current_params, :current_path => current_path, :param_name => options[:param_name] || Kaminari.config.param_name),
+          options.reverse_merge(:current_page => scope.current_page, :num_pages => scope.num_pages, :per_page => scope.limit_value, :param_name => Kaminari.config.param_name, :remote => false)
+        )
+        paginator.to_s
+      end
+
+      # A simple "Twitter like" pagination link that creates a link to the next page.
+      # Works on Sinatra.
+      #
+      # ==== Examples
+      # Basic usage:
+      #
+      #   <%= link_to_next_page @items, 'Next Page' %>
+      #
+      # Ajax:
+      #
+      #   <%= link_to_next_page @items, 'Next Page', :remote => true %>
+      #
+      # By default, it renders nothing if there are no more results on the next page.
+      # You can customize this output by passing a block.
+      #
+      #   <%= link_to_next_page @users, 'Next Page' do %>
+      #     <span>No More Pages</span>
+      #   <% end %>
+      def link_to_next_page(scope, name, options = {}, &block)
+        params = options.delete(:params) || (Rack::Utils.parse_query(env['QUERY_STRING']).symbolize_keys rescue {})
+        param_name = options.delete(:param_name) || Kaminari.config.param_name
+        query = params.merge(param_name => (scope.current_page + 1))
+        link_to_unless scope.last_page?, name, env['PATH_INFO'] + (query.empty? ? '' : "?#{query.to_query}"), options.merge(:rel => 'next') do
+          block.call; nil if block
+        end
+      end
+    end
+  end
+end
+
+if defined? I18n
+  I18n.load_path += Dir.glob(File.expand_path('../../../../config/locales/*.yml', __FILE__))
+end
+
+rescue LoadError
+
+$stderr.puts "[!]You shold install `padrino-helpers' gem if you want to use kaminari's pagination helpers with Sinatra."
+$stderr.puts "[!]Kaminari::Helpers::SinatraHelper does nothing now..."
+
+module Kaminari::Helpers
+  module SinatraHelper
+    def self.registered(*)
+    end
+  end
+end
+
+end

lib/kaminari/hooks.rb

@@ -0,0 +1,37 @@
+module Kaminari
+  class Hooks
+    def self.init!
+      ActiveSupport.on_load(:active_record) do
+        require 'kaminari/models/active_record_extension'
+        ::ActiveRecord::Base.send :include, Kaminari::ActiveRecordExtension
+      end
+
+      if defined? ::Mongoid
+        require 'kaminari/models/mongoid_extension'
+        ::Mongoid::Document.send :include, Kaminari::MongoidExtension::Document
+        ::Mongoid::Criteria.send :include, Kaminari::MongoidExtension::Criteria
+      end
+
+      ActiveSupport.on_load(:mongo_mapper) do
+        require 'kaminari/models/mongo_mapper_extension'
+        ::MongoMapper::Document.send :include, Kaminari::MongoMapperExtension::Document
+        ::Plucky::Query.send :include, Kaminari::PluckyCriteriaMethods
+        ::Plucky::Query.send :include, Kaminari::PageScopeMethods
+      end
+
+      if defined? ::DataMapper
+        require 'kaminari/models/data_mapper_extension'
+        ::DataMapper::Collection.send :include, Kaminari::DataMapperExtension::Collection
+        ::DataMapper::Model.append_extensions Kaminari::DataMapperExtension::Model
+        # ::DataMapper::Model.send :extend, Kaminari::DataMapperExtension::Model
+      end
+      require 'kaminari/models/array_extension'
+
+      require File.join(File.dirname(__FILE__), 'models/array_extension')
+
+      ActiveSupport.on_load(:action_view) do
+        ::ActionView::Base.send :include, Kaminari::ActionViewExtension
+      end
+    end
+  end
+end

lib/kaminari/models/array_extension.rb

@@ -1,3 +1,4 @@
+require 'active_support/core_ext/module'
 module Kaminari
   # Kind of Array that can paginate
   class PaginatableArray < Array

lib/kaminari/railtie.rb

@@ -1,49 +1,7 @@
-require 'rails'
-# ensure ORMs are loaded *before* initializing Kaminari
-begin; require 'mongoid'; rescue LoadError; end
-begin; require 'mongo_mapper'; rescue LoadError; end
-begin; require 'dm-core'; require 'dm-aggregates'; rescue LoadError; end
-
-require 'kaminari/config'
-require 'kaminari/helpers/action_view_extension'
-require 'kaminari/helpers/paginator'
-require 'kaminari/models/page_scope_methods'
-require 'kaminari/models/configuration_methods'
-
 module Kaminari
   class Railtie < ::Rails::Railtie #:nodoc:
     initializer 'kaminari' do |app|
-      ActiveSupport.on_load(:active_record) do
-        require 'kaminari/models/active_record_extension'
-        ::ActiveRecord::Base.send :include, Kaminari::ActiveRecordExtension
-      end
-
-      if defined? ::Mongoid
-        require 'kaminari/models/mongoid_extension'
-        ::Mongoid::Document.send :include, Kaminari::MongoidExtension::Document
-        ::Mongoid::Criteria.send :include, Kaminari::MongoidExtension::Criteria
-      end
-
-      ActiveSupport.on_load(:mongo_mapper) do
-        require 'kaminari/models/mongo_mapper_extension'
-        ::MongoMapper::Document.send :include, Kaminari::MongoMapperExtension::Document
-        ::Plucky::Query.send :include, Kaminari::PluckyCriteriaMethods
-        ::Plucky::Query.send :include, Kaminari::PageScopeMethods
-      end
-
-      if defined? ::DataMapper
-        require 'kaminari/models/data_mapper_extension'
-        ::DataMapper::Collection.send :include, Kaminari::DataMapperExtension::Collection
-        ::DataMapper::Model.append_extensions Kaminari::DataMapperExtension::Model
-#         ::DataMapper::Model.send :extend, Kaminari::DataMapperExtension::Model
-      end
-      require 'kaminari/models/array_extension'
-
-      require File.join(File.dirname(__FILE__), 'models/array_extension')
-
-      ActiveSupport.on_load(:action_view) do
-        ::ActionView::Base.send :include, Kaminari::ActionViewExtension
-      end
+      Kaminari::Hooks.init!
     end
   end
 end

lib/kaminari/sinatra.rb

@@ -0,0 +1,8 @@
+require 'kaminari'
+module Kaminari
+  module Helpers
+    autoload :SinatraHelper, 'kaminari/helpers/sinatra_helper'
+  end
+end
+Kaminari::Hooks.init!
+