Move the "empty search for latest" to collections

There is now a "latest" collection (or "latest_nsfw").
The feature didn't look much used, since it didn't work on many
backends.
Using collections will make it easy to support other things
like most viewed, featured, etc.
As a bonus, I added tests for every backend with the feature.

modules/youporn/backend.py

@@ -20,8 +20,9 @@
 
 from __future__ import with_statement
 
-from weboob.capabilities.video import ICapVideo
+from weboob.capabilities.video import ICapVideo, BaseVideo
 from weboob.tools.backend import BaseBackend
+from weboob.capabilities.collection import ICapCollection, CollectionNotFound
 
 from .browser import YoupornBrowser
 from .video import YoupornVideo
@@ -30,7 +31,7 @@ from .video import YoupornVideo
 __all__ = ['YoupornBackend']
 
 
-class YoupornBackend(BaseBackend, ICapVideo):
+class YoupornBackend(BaseBackend, ICapVideo, ICapCollection):
     NAME = 'youporn'
     MAINTAINER = 'Romain Bignon'
     EMAIL = 'romain@weboob.org'
@@ -45,7 +46,7 @@ class YoupornBackend(BaseBackend, ICapVideo):
 
     SORTBY = ['relevance', 'rating', 'views', 'time']
 
-    def search_videos(self, pattern=None, sortby=ICapVideo.SEARCH_RELEVANCE, nsfw=False, max_results=None):
+    def search_videos(self, pattern, sortby=ICapVideo.SEARCH_RELEVANCE, nsfw=False, max_results=None):
         if not nsfw:
             return set()
         with self.browser:
@@ -62,4 +63,21 @@ class YoupornBackend(BaseBackend, ICapVideo):
 
         return video
 
+    def iter_resources(self, objs, split_path):
+        if BaseVideo in objs:
+            collection = self.get_collection(objs, split_path)
+            if collection.path_level == 0:
+                yield self.get_collection(objs, [u'latest_nsfw'])
+            if collection.split_path == [u'latest_nsfw']:
+                for video in self.browser.latest_videos():
+                    yield video
+
+    def validate_collection(self, objs, collection):
+        if collection.path_level == 0:
+            return
+        if BaseVideo in objs and collection.split_path == [u'latest_nsfw']:
+            collection.title = u'Latest YouPorn videos (NSFW)'
+            return
+        raise CollectionNotFound(collection.split_path)
+
     OBJECTS = {YoupornVideo: fill_video}

modules/youporn/browser.py

@@ -44,9 +44,11 @@ class YoupornBrowser(BaseBrowser):
         return self.page.get_video(video)
 
     def search_videos(self, pattern, sortby):
-        if not pattern:
-            self.home()
-        else:
-            self.location(self.buildurl('/search/%s' % sortby, query=pattern.encode('utf-8')))
+        self.location(self.buildurl('/search/%s' % sortby, query=pattern.encode('utf-8')))
+        assert self.is_on_page(IndexPage)
+        return self.page.iter_videos()
+
+    def latest_videos(self):
+        self.home()
         assert self.is_on_page(IndexPage)
         return self.page.iter_videos()

modules/youporn/test.py

@@ -19,12 +19,14 @@
 
 
 from weboob.tools.test import BackendTest
+from weboob.capabilities.video import BaseVideo
+
 
 class YoupornTest(BackendTest):
     BACKEND = 'youporn'
 
-    def test_youporn(self):
-        self.assertTrue(len(self.backend.search_videos('penis', nsfw=False)) == 0)
+    def test_search(self):
+        self.assertTrue(len(self.backend.search_videos('ass to mouth', nsfw=False)) == 0)
 
         l = list(self.backend.search_videos('ass to mouth', nsfw=True))
         self.assertTrue(len(l) > 0)
@@ -32,3 +34,10 @@ class YoupornTest(BackendTest):
         self.backend.fillobj(v, ('url',))
         self.assertTrue(v.url and v.url.startswith('http://'), 'URL for video "%s" not found: %s' % (v.id, v.url))
         self.backend.browser.openurl(v.url)
+
+    def test_latest(self):
+        l = list(self.backend.iter_resources([BaseVideo], [u'latest_nsfw']))
+        self.assertTrue(len(l) > 0)
+        v = l[0]
+        self.backend.fillobj(v, ('url',))
+        self.assertTrue(v.url and v.url.startswith('http://'), 'URL for video "%s" not found: %s' % (v.id, v.url))