Ignore locked accounts when syncing followers

Previously, if a locked account was following the bot, it would give up syncing friends after receiving an error from Twitter if it had previously attempted to follow that account and the account hadn't accepted the request yet. Now, the bot does not attempt to follow locked accounts.

refs hatkirby/snitch#1

1 files changed, 10 insertions, 4 deletions

@@ -80,22 +80,28 @@ int main(int argc, char** argv)
           std::end(followers),
           std::back_inserter(oldFriends));
 
-        std::list<twitter::user_id> newFollowers;
+        std::set<twitter::user_id> newFollowers;
         std::set_difference(
           std::begin(followers),
           std::end(followers),
           std::begin(friends),
           std::end(friends),
-          std::back_inserter(newFollowers));
+          std::inserter(newFollowers, std::begin(newFollowers)));
 
         for (twitter::user_id f : oldFriends)
         {
           client.unfollow(f);
         }
 
-        for (twitter::user_id f : newFollowers)
+        std::list<twitter::user> newFollowerObjs =
+          client.hydrateUsers(std::move(newFollowers));
+
+        for (twitter::user f : newFollowerObjs)
         {
-          client.follow(f);
+          if (!f.isProtected())
+          {
+            client.follow(f);
+          }
         }
       } catch (const twitter::twitter_error& error)
       {