From bd2f1b5e231e9f2f6f9867edb36cafb56e3c27b1 Mon Sep 17 00:00:00 2001
From: Akira Matsuda <ronnie@dio.jp>
Date: Sat, 5 Feb 2011 23:05:40 +0900
Subject: [PATCH] the first implementation of pagination helper

---
 lib/kaminari/helpers.rb                     | 40 +++++++++++++++++++++
 lib/kaminari/railtie.rb                     |  3 ++
 spec/controllers/application_helper_spec.rb | 21 +++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 lib/kaminari/helpers.rb
 create mode 100644 spec/controllers/application_helper_spec.rb

diff --git a/lib/kaminari/helpers.rb b/lib/kaminari/helpers.rb
new file mode 100644
index 0000000..5c8e5cc
--- /dev/null
+++ b/lib/kaminari/helpers.rb
@@ -0,0 +1,40 @@
+module Kaminari
+  module Helpers
+    def paginate(scope, options = {}, &block)
+      prev_label, next_label, left, window, right, truncate, style = (options[:prev] || '&laquo; Prev'.html_safe), (options[:next] || 'Next &raquo;'.html_safe), (options[:left] || 2), (options[:window] || 5), (options[:right] || 2), (options[:truncate] || '...'), (options[:style] || 'page')
+      current_page, num_pages = scope.current_page, scope.num_pages
+
+      content_tag :div, :class => 'pagination' do
+        ''.html_safe.tap do |html|
+          # prev_link
+          html << link_to_if((current_page > 1), prev_label, url_for(:page => current_page - 1), :class => 'prev', :rel => 'prev') do
+            content_tag :span, prev_label, :class => 'prev'
+          end << "\n"
+
+          # page links
+          truncated = false
+          (1..num_pages).each do |i|
+            html << if (i <= left) || ((num_pages - i) < right) || ((i - current_page).abs < window)
+              truncated = false
+              content_tag :span, :class => "#{style}#{i == current_page ? ' current' : ''}" do
+                if i == 1
+                  #TODO pageが1だったらパラメーターからpageを取り除く
+                  link_to_unless_current i.to_s, :page => i
+                else
+                  link_to_unless_current i.to_s, :page => i
+                end
+              end
+            else
+              content_tag(:span, truncate, :class => style).tap { truncated = true } unless truncated
+            end << "\n"
+          end
+
+          # next_link
+          html << link_to_if((current_page < num_pages), next_label, url_for(:page => current_page + 1), :class => 'next', :rel => 'next') do
+            content_tag :span, next_label, :class => 'next'
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/kaminari/railtie.rb b/lib/kaminari/railtie.rb
index 092e9f1..6537197 100644
--- a/lib/kaminari/railtie.rb
+++ b/lib/kaminari/railtie.rb
@@ -1,11 +1,14 @@
 require 'rails'
 require 'active_record'
+require 'action_view'
 require File.join(File.dirname(__FILE__), 'active_record')
+require File.join(File.dirname(__FILE__), 'helpers')
 
 module Kaminari
   class Railtie < ::Rails::Railtie
     initializer 'paginatablize' do |app|
       ::ActiveRecord::Base.send :include, Kaminari::ActiveRecord
+      ::ActionView::Base.send :include, Kaminari::Helpers
     end
   end
 end
diff --git a/spec/controllers/application_helper_spec.rb b/spec/controllers/application_helper_spec.rb
new file mode 100644
index 0000000..c88470b
--- /dev/null
+++ b/spec/controllers/application_helper_spec.rb
@@ -0,0 +1,21 @@
+require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
+
+class ApplicationController < ActionController::Base; end
+class UsersController < ApplicationController
+  def index
+    @users = User.page params[:page]
+    render :inline => '<%= paginate @users %>'
+  end
+end
+
+describe UsersController, 'pagination' do
+  render_views
+  before do
+    1.upto(30) {|i| User.create! :name => "user#{'%02d' % i}" }
+  end
+
+  it 'renders' do
+    get :index
+    response.body.should =~ /pagination/
+  end
+end