Flask 自建扩展

1. 纯功能， 如： Flask-Login 提供用户认证
2. 对已有的库和工具包装(简化继承操作，并提供有用的功能，更方便)
   如： Flask-SQLAlchemy 包装了 SQLAlchemy

1. setuptools ：
2. wheel ：
3. twine: 发布python 包 (发布到 PyPI 后才能使用 pip 或 pipenv 安装)
4. readme_renderer: 将 md、rst、txt 文本 渲染成.html

1. 扩展的名称： Flask-<功能/第三方库名> 或 <功能/第三方库名>-Flask
2. 扩展的包名： flask_<功能/第三方库名> (小写加下划线)

• 使用扩展步骤: 导入扩展类 - 实例化 - 传入 app 初始化

  from flask_share import Share
  share = Share()  # extensions.py 中统一实例化所有扩展
  share.init_app(app) # 在工厂函数中统一初始化所有扩展
  # 也可以一步到位
  # share = share(app) 
  

• 新建扩展类 (flask_share/__init__.py)

  class Share(object):
    def __inti__(self, app=None):
      self.init_app(app)
      
    def init_app(self, app):
      # 兼容 0.7 以前版本
      if not hasattr(app, 'extensions'): 
        app.extensions={}
        
      # 在 app 应用中存储所有扩展实例, 可验证扩展是否完成实例化
      app.extensions['share'] = self
      
      # 扩展类添加到模板上下文中
      app.jinja_env.globals['share'] = self
      # app.context_processor(lambda：{'share'： self})
      
      # 扩展配置， 初始化后添加到 app.config 中, 以 SHARE_ 开头避免冲突
      app.config.setdefault('SHARE_SITES', 'weibo,wechat,douban,facebook,twitter,google,linkedin,qq,qzone')
      app.config.setdefault('SHARE_MOBILESITES','weibo,douban,qq,qzone')
      app.config.setdefault('SHARE_HIDE_ON_MOBILE', False)
      app.config.setdefault('SHARE_SERVER_LOCAL', False) # 是否使用内置资源
  

• 加载静态资源

  class Share(object):
    @staticmethod
    def load(css_url=None, js_url=None):
      
      if current_app.config('SHARE_SERVE_LOCAL'):# 使用本地进入条件
        css_url = url_for('share.static', filename='css/share.min.css')
        js_url = url_for('share.static', filename='js/share.min.js')
      
      if css_url is None:
        css_url = 'https://cdn.bootcss.com/social.share.js/1.0.16/css/share.min.css'
      if js_url is None:
        js_url = 'https://cdn.bootcss.com/social-share.js/1.0.16/js/social-share.min.js'
      return Markup('''<link rel="stylesheet" href="%s">\n
      	<script src="%s"></script>'''% (css_url, js_url))
    
    def init_app(self, app):
      # app.static_url_path 的引用是为了和用户设置一致
      blueprint = Blueprint('share', __name__, static_folder='static',
                           static_url_path='/share'+ app.static_url_path)
      app.register_blueprint(blueprint)
      
      
    
  

• 创建前端分享组件

  class Share(object):
    @staticmethod
    def create( title='', sites=None, mobile_sites=None,align='left',addtion_class=''):
      if sites is None:
        sites = current_app.config['SHARE_SITES']
      if mobile_sites is None:
        mobile_sites = current_app.config['SHARE_MOBILE_SITES']
        
      return Markup('''
      	<div class="social-share %s" data-sites="%s" data-mobile-site="%s"align="%s">
          %s</div>'''%(addition_class, sites, mobile_sites,align, title ))
      
  

• 在模板中使用

  {{ share.create('分享到：') }}
  

1. 添加文档字符串与注释后的完整代码

"""
    Flask-Share 
    # ~~~~~~~~~~~~~~ 
    Create social share component in Jinja2 tempalte based on share.js. 
    :copyright: (c) 2017 by Gavin Li. 
    :license: MIT, see LICENSE for more details. 
"""

import re 
from flask import current_app, url_for, Markup, Blueprint, request

class Share(object):
    
  @staticmethod
  def load(css_url=None, js_url=None):
    """ Load share.js resourse.
    
    :param css_url: if set, will be used as css url
    :param js_url: if set, will be used as js url
    :param serve_local: if set to True, the local resource will be used
    """
  
  @staticmethod
  def create( title='', sites=None, mobile_sites=None,align='left',addtion_class=''):
    """ Create a share component.
    
    :param title: the prompt displayed on the left of the share component.
    :param sites: a string that consist of sites, separate by comma.
    :param mobile_sites: a string that consist of sites, separate by comma.
    	supported site name: weibo, wechat, douban, facebook, twitter, google, linkedin, qq, qzone."
        for example: weibo,wechat, qq.
    :param mobile_sites: the sites displayed on mobile.
    :param align: the align of the share component,default to '`left`'.
    :param addition_class: the style class added to the share component.
    """
   

2. 编写 README 与文档

• 小项目 直接用 README概括所有的必需的说明
• 大项目 比较复杂的，多文件组织文档内容
  将项目部署到 Read the Docs上
  Sphinx + Github + Readthedocs的工作流编写和部署文档

3. 定义 python 包的元数据：(setup.py)

"""
	Flask-Share
    
    Create social share component in Jinja2 template based on share.js.
    :copyright: (c) 2022 by Gavin li.
    :license: MIT， see LICENSE for more details.
"""
form os import path
from codecs import open
form setuptools import setup

basedir = path.abspath(path.dirname(__file__))

# Get the long description from the README file
with open(path.join(basedir,'README.md'), encoding='utf-8') as f:
  long_description = f.read()
  
setup(
  name='Flask-Share', # 包名称
  version='0.1.0',  # 版本
  url='https://github.com/lghpython/flask-share',
  license='MIT', 
  author='xxx'
  author_email='xx@xx.com',
  description='xxx',
  long_description=long_description,
  long_description_content_type='text/markdown', # 默认渲染格式为 rst
  platforms='any',
  packages=['flask_share'], # 包含的包列表，包括子包，可用find_pakages()
  zip_safe=False,
  test_suite='test_flask_share', 测试包或模块
  include_package_data=True, 
  install_requires=['Flask'],  # 安装依赖
  keywords='flask extension development', # 项目关键词
  classifiers=[ # 分类词， 在 PyPI 中设置分类
    'DevelopmentStatus::3-Alpha',
    'Environment::WebEnvironment',
    'IntendedAudience::Developers',
    'License::OSIApproved::MITLicense',
    'ProgrammingLanguage::Python',
    'ProgrammingLanguage::Python::2',
    'ProgrammingLanguage::Python::2.7',
    'ProgrammingLanguage::Python::3',
    'ProgrammingLanguage::Python::3.3',
    'ProgrammingLanguage::Python::3.4',
    'ProgrammingLanguage::Python::3.5',
    'ProgrammingLanguage::Python::3.6',
    'Topic::Internet::WWW/HTTP::DynamicContent',
    'Topic::SoftwareDevelopment::Libraries::PythonModules']
  ]，
)

4. 指定打包其他文件： MANIFEST.in
   需要在 setup()方法中设置: include_package_data=True

graft flask_share/static
include LICENSE test_flask_share.py
# exclude 用来排除匹配文件
# recursive-include 递归匹配
# recursive-exclude 递归排除匹配
# graft 目录 包含目录下所有
# prune 目录 配出目录下所有

5. 编写单元测试

import unittest

from flask import Flask, render_template_string, current_app
from flask_share import Share

class ShareTestCase(unittest.TestCase):
  
  def setUp(self):
    self.mobile_agent={{'HTTP_USER_AGENT':'Mozilla/5.0(iPhone;CPUiPhoneOS9_1likeMacOSX)\
    	AppleWebKit/601.1.46(KHTML,likeGecko)Version/9.0Mobile/13B143Safari/601.1'}}
	app = Flask(__name__)
    app.testing=True
    self.share=Share(app)
    
    @app.route('/')
    def index():
      return render_template_string('{{share.load() }}\n {{share.create() }}')
    # 推送上下文
    self.context=app.app_context()
    self.context.push()
    self.client - app.test_client()
    
  def tearDown(self):
    self.context.pop()
    
  def test_create_on_mobile(self):
    current_app.config['SHARE_HIDE_ON_MOBILE'] = True
    response = self.client.get('/', environ_base=self.mobile_agent)
    data = response.get_data(as_text=True)
    self.assertIn('social-share.min.js', data)
    self.assertNotIn('<div class="socail-share"', data))
 

6. setup.cfg

• 注册访问
• 方便访问： 创建 .pypirc文件， 放置$HOME/.pypirc(win) 或~/.pypir(mac linux) 明文密码限制访问权限

  [distutils]
  index-servers=
  	pypi
      
  [pypi]
  username: 用户名
  password: 密码
  

• 创建 Source Distributions 包

  python setup.py sdist
  

• 创建 Wheel 包

  python setup.py bdist_wheel
  

• 合并命令

  python setup.py sdist bdist_wheel
  

• 安装 twine

  pipenv install twine --dev
  

• 上传

  twine upload dist/*