Support PPA list pagination

The PPA lists are paginated. To correctly fetch the list of PPAs, we
need to keep iterating over the paginated lists.

lppa/cli.py

@@ -46,8 +46,7 @@ def delete(args):
 
 
 def list(args):
-    ppas = lppa.utils.ppa_list()
-    for ppa_name in ppas:
+    for ppa_name in lppa.utils.ppa_list():
         print(ppa_name)
 
 

lppa/utils.py

@@ -23,7 +23,9 @@ def ppa_list():
     session = Session().get_session()
     me = session.me
     ppas_url = me.ppas_collection_link
-    r = requests.get(ppas_url)
-    ppas = r.json()
-    ppa_names = [ppa['name'] for ppa in ppas['entries']]
-    return sorted(ppa_names)
+    while ppas_url:
+        r = requests.get(ppas_url)
+        ppas = r.json()
+        ppas_url = ppas.get('next_collection_link')
+        for ppa in ppas['entries']:
+            yield ppa['name']