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)

nyaa/views/__init__.py

@@ -8,7 +8,7 @@ from nyaa.views import (  # isort:skip
 )
 
 
-def register(flask_app):
+def register_views(flask_app):
     """ Register the blueprints using the flask_app object """
     flask_app.register_blueprint(account.bp)
     flask_app.register_blueprint(admin.bp)

nyaa/views/account.py

@@ -6,10 +6,11 @@ from ipaddress import ip_address
 
 import flask
 
-from nyaa import app, forms, models
+from nyaa import forms, models
 from nyaa.extensions import db
 from nyaa.views.users import get_activation_link
 
+app = flask.current_app
 bp = flask.Blueprint('account', __name__)
 
 

nyaa/views/main.py

@@ -5,12 +5,13 @@ from datetime import datetime, timedelta
 import flask
 from flask_paginate import Pagination
 
-from nyaa import app, models
+from nyaa import models
 from nyaa.search import (DEFAULT_MAX_SEARCH_RESULT, DEFAULT_PER_PAGE, SERACH_PAGINATE_DISPLAY_MSG,
                          _generate_query_string, search_db, search_elastic)
 from nyaa.utils import chain_get
 from nyaa.views.account import logout
 
+app = flask.current_app
 bp = flask.Blueprint('main', __name__)
 
 

nyaa/views/torrents.py

@@ -7,10 +7,11 @@ from werkzeug.datastructures import CombinedMultiDict
 
 from sqlalchemy.orm import joinedload
 
-from nyaa import app, backend, forms, models, torrents
+from nyaa import backend, forms, models, torrents
 from nyaa.extensions import db
 from nyaa.utils import cached_function
 
+app = flask.current_app
 bp = flask.Blueprint('torrents', __name__)
 
 

nyaa/views/users.py

@@ -5,12 +5,13 @@ from flask_paginate import Pagination
 
 from itsdangerous import BadSignature, URLSafeSerializer
 
-from nyaa import app, forms, models
+from nyaa import forms, models
 from nyaa.extensions import db
 from nyaa.search import (DEFAULT_MAX_SEARCH_RESULT, DEFAULT_PER_PAGE, SERACH_PAGINATE_DISPLAY_MSG,
                          _generate_query_string, search_db, search_elastic)
 from nyaa.utils import chain_get
 
+app = flask.current_app
 bp = flask.Blueprint('users', __name__)