Add "Network status and alerts" page and RSS feed (fixes #170)

Generate alerts pages through alerts.rb plugin
Allow to keep short alias urls for each alert
Move alert pages in _alerts
Update sitemap plugin to include alerts

_plugins/alerts.rb

@@ -0,0 +1,49 @@
+require 'yaml'
+
+module Jekyll
+  
+  class AlertPage < Page
+    def initialize(site, base, lang, srcdir, src, dstdir, dst, date)
+      @site = site
+      @base = base
+      @dir = '/'+dstdir
+      @name = dst
+      self.process(dst)
+      self.read_yaml(File.join(base, srcdir), src)
+      self.data['lang'] = lang
+      self.data['date'] = date
+      self.data['layout'] = 'alert'
+      if dstdir == ''
+        self.data['redirect'] = src.split('.')[0]
+      else
+        self.data['category'] = 'alert'
+        if self.data.has_key?('alias')
+          site.pages << AlertPage.new(site, base, lang, srcdir, src, '', self.data['alias']+'.html', date)
+        end
+      end
+    end
+  end
+
+  class AlertPageGenerator < Generator
+    def generate(site)
+      #generate each alert based on templates
+      Dir.foreach('_alerts') do |file|
+        next if file == '.' or file == '..'
+        lang = 'en'
+        src = file
+        dst = file
+        srcdir = '_alerts'
+        dstdir = lang + '/alert'
+        date = dst.split('-')
+        next if date.length < 4
+        date = date[0] + '-' + date[1] + '-' + date[2]
+        next if !/^[0-9]{4}-[0-9]{2}-[0-9]{2}$/.match(date)
+        site.pages << AlertPage.new(site, site.source, lang, '_alerts', src, dstdir, dst, date)
+      end
+      #TODO alerts are only generated for english language,
+      #but they could also be translated at some point. They would however
+      #need to fallback to english when no translation is available.
+    end
+  end
+
+end

_plugins/catpage_for.rb

@@ -0,0 +1,49 @@
+#catpage_for allows to loop in site.pages sorted by custom page
+#variables and filtered by page.category.
+#Example : {% catpage_for p in site.pages sort_by:date category:release %}
+
+module Jekyll
+  module SortedForImpl
+    def render(context)
+      sorted_collection = collection_to_sort context
+      return if sorted_collection.empty?
+      sort_attr = @attributes['sort_by']
+      category_attr = @attributes['category']
+      #filter page by given category
+      s = []
+      for x in sorted_collection
+        if x.to_liquid.has_key?('category') && x.to_liquid['category'] == category_attr
+          s.push(x)
+        end
+      end
+      sorted_collection = s
+      #sort collection by given variable
+      sorted_collection = sorted_collection.sort_by { |i| i.to_liquid[sort_attr] }
+      #return modified array
+      original_name = @collection_name
+      result = nil
+      context.stack do
+        sorted_collection_name = "#{@collection_name}_sorted".sub('.', '_')
+        context[sorted_collection_name] = sorted_collection
+        @collection_name = sorted_collection_name
+        result = super
+        @collection_name = original_name
+      end
+      result
+    end
+  end
+ 
+  class SortedForTag < Liquid::For
+    include SortedForImpl
+ 
+    def collection_to_sort(context)
+      return context[@collection_name].dup
+    end
+ 
+    def end_tag
+      'endcatpage_for'
+    end
+  end
+end
+ 
+Liquid::Template.register_tag('catpage_for', Jekyll::SortedForTag)

_plugins/sitemap.rb

@@ -66,6 +66,13 @@ module Jekyll
           sitemap.puts '  <loc>http://bitcoin.org/'+file1.gsub('.html','')+'</loc>'
           sitemap.puts '</url>'
         end
+        #Add english alerts pages
+        Dir.foreach('_alerts') do |file|
+          next if file == '.' or file == '..'
+          sitemap.puts '<url>'
+          sitemap.puts '  <loc>http://bitcoin.org/en/alert/'+file.gsub('.html','')+'</loc>'
+          sitemap.puts '</url>'
+        end
         #Add posts
         site.posts.each do |post|
           sitemap.puts '<url>'