Refactor into an app factory [2 of 2] (#322)

* Replace all `from nyaa import app` imports with `app = flask.current_app` (or `from flask import current_app as app` where possible)
* Add a separate config object for top-level and class statements as `nyaa.extensions.config`
Required because those codes don't have app context at the time of evaluation/execution.
* Remove `routes.py` file and register all blueprints in `nyaa/__init__.py`
* Refactor `nyaa/__init__.py` into an app factory
* Update tools
* Update tests (temporary, will be replaced)

tests/__init__.py

@@ -3,7 +3,7 @@
 import os
 import unittest
 
-from nyaa import app
+from nyaa import create_app
 
 USE_MYSQL = True
 
@@ -12,6 +12,7 @@ class NyaaTestCase(unittest.TestCase):
 
     @classmethod
     def setUpClass(cls):
+        app = create_app('config')
         app.config['TESTING'] = True
         cls.app_context = app.app_context()
 

tests/test_nyaa.py

@@ -6,16 +6,18 @@ import nyaa
 
 class NyaaTestCase(unittest.TestCase):
 
+    nyaa_app = nyaa.create_app('config')
+
     def setUp(self):
-        self.db, nyaa.app.config['DATABASE'] = tempfile.mkstemp()
-        nyaa.app.config['TESTING'] = True
-        self.app = nyaa.app.test_client()
-        with nyaa.app.app_context():
+        self.db, self.nyaa_app.config['DATABASE'] = tempfile.mkstemp()
+        self.nyaa_app.config['TESTING'] = True
+        self.app = self.nyaa_app.test_client()
+        with self.nyaa_app.app_context():
             nyaa.db.create_all()
 
     def tearDown(self):
         os.close(self.db)
-        os.unlink(nyaa.app.config['DATABASE'])
+        os.unlink(self.nyaa_app.config['DATABASE'])
 
     def test_index_url(self):
         rv = self.app.get('/')