add a few more category methods

mediawikibot.rb

@@ -37,6 +37,10 @@ class WikiBot
     return @wiki + "index.php?title=" + url_encode(title) + "&redirect=no"
   end
   
+  def url_page (title)
+    return @wiki + "index.php?title=" + url_encode(title)
+  end
+
   def url_raw (title)
     return @wiki + "index.php?title=" + url_encode(title) + "&action=raw"
   end
@@ -197,6 +201,31 @@ class WikiBot
     return articles
   end
 
+  def get_categories(title)
+
+    if is_redirect?(title) 
+      return []
+    end
+    
+    categories = []
+    categories_html = @client.get_content(url_page(title)).scan(/<div id="catlinks">(.*?)<\/div>/)[0][0]
+    categories_html.scan(/title="(.*?)"/) do |m|
+      category = CGI.unescapeHTML(m[0])
+      categories.push(category)
+    end
+
+    return categories[1..-1]
+  end
+    
+  def is_in_category?(title, category)
+    
+    if is_redirect?(title) 
+      return false
+    end
+
+    get_categories(title).member?(category)
+  end
+
 end # class WikiBot
 
 end # module MediaWikiBot