Clean up the architecture

Purposes :
- isolate the plugins calls
- distinction between parsing the web request and running the search (Search class). To be able to test code easily, to run searx code outside a web server, to filter the search query parameters with plugins more easily, etc...

Details :
- request.request_data contains request.form or request.args (initialize inside pre_request() function)
- Query class is renamed RawTextQuery
- SearchQuery class defines all search parameters
- get_search_query_from_webapp create a SearchQuery instance (basically the previous Search.__init__ code)
- Search class and SearchWithPlugins class takes a SearchQuery instance as class constructor parameter
- SearchWithPlugins class inherites from Search class, and run plugins
- A dedicated function search_with_plugins executes plugins to have a well define locals() (which is used by the plugins code).
- All plugins code is executed inside the try...except block (webapp.py, index function)
- advanced_search HTTP parameter value stays in webapp.py (it is only part of UI)
- multiple calls to result_container.get_ordered_results() doesn't compute the order multiple time (note : this method was call only once before)
- paging value is stored in the result_container class (compute in the extend method)
- test about engine.suspend_end_time is done during search method call (instead of __init__)
- check that the format parameter value is one of these : html, rss, json, rss (before the html value was assumed but some text formatting wasn't not done)

searx/query.py

@@ -25,8 +25,8 @@ import string
 import re
 
 
-class Query(object):
-    """parse query"""
+class RawTextQuery(object):
+    """parse raw text query (the value from the html input)"""
 
     def __init__(self, query, disabled_engines):
         self.query = query
@@ -130,3 +130,19 @@ class Query(object):
     def getFullQuery(self):
         # get full querry including whitespaces
         return string.join(self.query_parts, '')
+
+
+class SearchQuery(object):
+    """container for all the search parameters (query, language, etc...)"""
+
+    def __init__(self, query, engines, categories, lang, safesearch, pageno, time_range):
+        self.query = query
+        self.engines = engines
+        self.categories = categories
+        self.lang = lang
+        self.safesearch = safesearch
+        self.pageno = pageno
+        self.time_range = time_range
+
+    def __str__(self):
+        return str(self.query) + ";" + str(self.engines)