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/arte/backend.py

@@ -20,7 +20,8 @@
 
 from __future__ import with_statement
 
-from weboob.capabilities.video import ICapVideo
+from weboob.capabilities.video import ICapVideo, BaseVideo
+from weboob.capabilities.collection import ICapCollection, CollectionNotFound
 from weboob.tools.backend import BaseBackend, BackendConfig
 from weboob.tools.value import Value
 
@@ -31,7 +32,7 @@ from .video import ArteVideo
 __all__ = ['ArteBackend']
 
 
-class ArteBackend(BaseBackend, ICapVideo):
+class ArteBackend(BaseBackend, ICapVideo, ICapCollection):
     NAME = 'arte'
     MAINTAINER = 'Romain Bignon'
     EMAIL = 'romain@weboob.org'
@@ -50,7 +51,7 @@ class ArteBackend(BaseBackend, ICapVideo):
         with self.browser:
             return self.browser.get_video(_id)
 
-    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):
         with self.browser:
             return self.browser.search_videos(pattern)
 
@@ -65,4 +66,21 @@ class ArteBackend(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'])
+            if collection.split_path == [u'latest']:
+                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']:
+            collection.title = u'Latest Arte videos'
+            return
+        raise CollectionNotFound(collection.split_path)
+
     OBJECTS = {ArteVideo: fill_video}

modules/arte/browser.py

@@ -36,7 +36,7 @@ class ArteBrowser(BaseBrowser):
              r'http://videos.arte.tv/\w+/videos/(?P<id>.+)\.html': VideoPage
             }
 
-    SEARCH_LANG = {'fr': 'recherche', 'de':'suche', 'en': 'search'}
+    SEARCH_LANG = {'fr': 'recherche', 'de': 'suche', 'en': 'search'}
 
     def __init__(self, lang, quality, *args, **kwargs):
         BaseBrowser.__init__(self, *args, **kwargs)
@@ -52,9 +52,11 @@ class ArteBrowser(BaseBrowser):
         self.location('http://videos.arte.tv/fr/videos/toutesLesVideos')
 
     def search_videos(self, pattern):
-        if not pattern:
-            self.home()
-        else:
-            self.location(self.buildurl('/%s/do_search/videos/%s' % (self.lang, self.SEARCH_LANG[self.lang]), q=pattern.encode('utf-8')))
+        self.location(self.buildurl('/%s/do_search/videos/%s' % (self.lang, self.SEARCH_LANG[self.lang]), q=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/arte/test.py

@@ -19,13 +19,22 @@
 
 
 from weboob.tools.test import BackendTest
+from weboob.capabilities.video import BaseVideo
+
 
 class ArteTest(BackendTest):
     BACKEND = 'arte'
 
-    def test_arte(self):
+    def test_search(self):
         l = list(self.backend.search_videos('arte'))
         if len(l) > 0:
             v = l[0]
             self.backend.fillobj(v, ('url',))
             self.assertTrue(v.url and v.url.startswith('rtmp://'), 'URL for video "%s" not found: %s' % (v.id, v.url))
+
+    def test_latest(self):
+        l = list(self.backend.iter_resources([BaseVideo], [u'latest']))
+        assert len(l)
+        v = l[0]
+        self.backend.fillobj(v, ('url',))
+        self.assertTrue(v.url and v.url.startswith('rtmp://'), 'URL for video "%s" not found: %s' % (v.id, v.url))