RSS feeds accept query parameter start, end and limit

CHANGELOG

@@ -1,4 +1,6 @@
 HEAD:
+          RSS feeds accept query parameters, sush as 
+          http://localhost:2500/wiki/rss_with_headlines?start=2005-02-18&end=2005-02-19&limit=10
           RedCloth 3.0.3 (read: mixing Textile and Markdown in the same page)
           Files/pictures can be uploaded to a wiki and served from / displayed in wiki pages
           Wiki link syntax doesn't conflict with Textile hyperlink syntax. Therefore

app/controllers/wiki_controller.rb

@@ -1,10 +1,11 @@
 require 'application'
 require 'fileutils'
 require 'redcloth_for_tex'
+require 'parsedate'
 
 class WikiController < ApplicationController
 
-  layout 'default', :except => [:rss_feed, :rss_with_headlines, :tex,  :export_tex, :export_html]
+  layout 'default', :except => [:rss_feed, :rss_with_content, :rss_with_headlines, :tex,  :export_tex, :export_html]
 
   def index
     if @web_name
@@ -89,11 +90,11 @@ class WikiController < ApplicationController
   end
 
   def rss_with_content
-    render_rss
+    render_rss(hide_description = false, *parse_rss_params)
   end
 
   def rss_with_headlines
-    render_rss(hide_description = true)
+    render_rss(hide_description = true, *parse_rss_params)
   end
 
   def search
@@ -291,6 +292,18 @@ class WikiController < ApplicationController
     }
   end
 
+  def parse_rss_params
+    if @params.include? 'limit'
+      limit = @params['limit'].to_i rescue nil
+      limit = nil if limit == 0
+    else
+      limit = 15
+    end
+    start_date = Time.local(*ParseDate::parsedate(@params['start'])) rescue nil
+    end_date = Time.local(*ParseDate::parsedate(@params['end'])) rescue nil
+    [ limit, start_date, end_date ]
+  end
+  
   def password_check(password)
     if password == @web.password
       cookies['web_address'] = password
@@ -306,8 +319,15 @@ class WikiController < ApplicationController
     ip
   end
 
-  def render_rss(hide_description = false)
-    @pages_by_revision = @web.select.by_revision.first(15)
+  def render_rss(hide_description = false, limit = 15, start_date = nil, end_date = nil)
+    if limit && !start_date && !end_date
+      @pages_by_revision = @web.select.by_revision.first(limit)
+    else
+      @pages_by_revision = @web.select.by_revision
+      @pages_by_revision.reject! { |page| page.created_at < start_date } if start_date
+      @pages_by_revision.reject! { |page| page.created_at > end_date } if end_date
+    end
+    
     @hide_description = hide_description
     @response.headers['Content-Type'] = 'text/xml'
     render 'wiki/rss_feed'

test/functional/wiki_controller_test.rb

@@ -344,7 +344,6 @@ class WikiControllerTest < Test::Unit::TestCase
     assert_equal @home.revisions[0], r.template_objects['revision']
   end
 
-
   def test_rss_with_content
     setup_wiki_with_three_pages
   
@@ -388,6 +387,45 @@ class WikiControllerTest < Test::Unit::TestCase
     assert_template_xpath_match '/rss/channel/item/link', expected_page_links
   end
 
+  def test_rss_with_params
+    setup_wiki_with_30_pages
+
+    r = process 'rss_with_headlines', 'web' => 'wiki1'
+    assert_success
+    pages = r.template_objects['pages_by_revision']
+    assert_equal 15, pages.size, 15
+    
+    r = process 'rss_with_headlines', 'web' => 'wiki1', 'limit' => '5'
+    assert_success
+    pages = r.template_objects['pages_by_revision']
+    assert_equal 5, pages.size
+    
+    r = process 'rss_with_headlines', 'web' => 'wiki1', 'limit' => '25'
+    assert_success
+    pages = r.template_objects['pages_by_revision']
+    assert_equal 25, pages.size
+    
+    r = process 'rss_with_headlines', 'web' => 'wiki1', 'limit' => 'all'
+    assert_success
+    pages = r.template_objects['pages_by_revision']
+    assert_equal 31, pages.size
+    
+    r = process 'rss_with_headlines', 'web' => 'wiki1', 'start' => '1976-10-16'
+    assert_success
+    pages = r.template_objects['pages_by_revision']
+    assert_equal 16, pages.size
+    
+    r = process 'rss_with_headlines', 'web' => 'wiki1', 'end' => '1976-10-16'
+    assert_success
+    pages = r.template_objects['pages_by_revision']
+    assert_equal 15, pages.size
+    
+    r = process 'rss_with_headlines', 'web' => 'wiki1', 'start' => '1976-10-01', 'end' => '1976-10-06'
+    assert_success
+    pages = r.template_objects['pages_by_revision']
+    assert_equal 5, pages.size
+  end
+  
   def test_save
     r = process 'save', 'web' => 'wiki1', 'id' => 'NewPage', 'content' => 'Contents of a new page', 
       'author' => 'AuthorOfNewPage'

test/test_helper.rb

@@ -45,6 +45,13 @@ class Test::Unit::TestCase
         10.minutes.ago, Author.new('Guest', '127.0.0.2'))
   end
   
+  def setup_wiki_with_30_pages
+    (1..30).each { |i|
+      @wiki.write_page('wiki1', "page#{i}", "Test page #{i}\ncategory: test", 
+                                Time.local(1976, 10, i, 12, 00, 00), Author.new('Dema', '127.0.0.2'))
+    }
+  end
+  
   def tear_down_wiki
     ApplicationController.wiki = nil
   end