sns.py

import os

COV = None
if os.environ.get('FLASK_COVERAGE'):
    import coverage
    COV = coverage.coverage(branch=True, include='app/*')
    COV.start()

import sys
import click
from app import create_app, db
from app.models import User, Follow, Role, Permission, Post, Comment
from flask_migrate import Migrate, upgrade

app = create_app(os.getenv('FLASK_CONFIG') or 'default')
migrate = Migrate(app, db)

@app.shell_context_processor
def make_shell_context():
    """flask The shell command invokes this function
    with a shell_context_processor decorator every time it starts up""" 
    return dict(db=db, User=User, Follow=Follow,
                Role=Role, Permission=Permission, Post=Post, Comment=Comment)

@app.cli.command()
@click.option('--coverage/--no-coverage', default=False,help='Run tests under code coverage.')
def test(coverage):
    """Run the unit tests."""
    if coverage and not os.environ.get('FLASK_COVERAGE'):
        os.environ['FLASK_COVERAGE'] = '1'
        os.execvp(sys.executable, [sys.executable] + sys.argv)
    import unittest
    tests = unittest.TestLoader().discover('tests')
    unittest.TextTestRunner(verbosity=2).run(tests)
    if COV:
        COV.stop()
        COV.save()
        print('Coverage Summary.')
        COV.report()
        basedir = os.path.abspath(os.path.dirname(__file__))
        covdir = os.path.join(basedir, 'tmp/coverage')
        COV.html_report(directory=covdir)
        print('HTMLL version:file://{}/index.html'.format(covdir))
        COV.erase()

# @app.cli.command()
# @click.option('--length', default=25,
#                 help='Number of functions to include in the profiler report.')
# @click.option('--profile-dir', default=None,
#                 help='Directory where profiler data files are saved.')
# def profile(length, profile_dir):
#     """Start the application under the code profiler."""
#     from werkzeug.contrib.profiler import ProfilerMiddleware
#     app.wsgi_app = ProfilerMiddleware(app.wsgi_app, restrictions=[length],
#                                         profile_dir=profile_dir)
#     app.run()

@app.cli.command()
def deploy():
    """Run deployment tasks."""
    # migrate database to latest revision
    upgrade()

    # create or update user roles
    Role.insert_roles()

    # ensure all users are following themselves
    User.add_self_follows()