#!/usr/bin/env python

# -*- coding: utf-8 -*-

"""

@version: 3.5

@author: morgana

@license: Apache Licence

@contact: vipmorgana@gmail.com

@site:

@software: PyCharm

@file: notes.py

@time: 2017/6/19 上午8:51

"""

# 1.yield的表达式形成的应用

# 2.面向过程编程：grep -rl 'root' /etc

# 3.递归

# 4.内置函数

#

# 三元表达式：res=True if 1>2 else False

# 列表解析：[i for i in range(10) if i>5]

# 生成器表达式：（i for i in range(10) if i>5）

# 生成器：函数函数内部有yield关键字，那函数执行的结果就是生成器

# def init(func):

#     def warpper(*args,**kwargs):

#         g=func(*args,**kwargs)

#         next(g)

#         return g

#     return warpper

#

# @init

# def foo():

#     print('starting')

#     while True:

#         x=yield

#         print('value: ',x)

#send的效果

#1.先从为暂停位置的那个yield传一个值，然后yield会把值赋值x

#2:与next的功能一样

# g=foo()

# print(g)

# next(g)

# print('='*30)

# print(g.send(1))

# print('='*30)

# print(g.send(2))

# print(g.send(3))

# print(g.send(3))

#

# @init

# def eater(name):

#     print('%s read to eat ' %name)

#     food_list=[]

#     while True:

#         food=yield food_list

#         food_list.append(food)

#         print("%s start to eat %s" %(name,food))

#

#

#

# e=eater('alex')

# e.send("shit")

# e.send("dog shit")

#

# def init(func):

#     def warpper(*args,**kwargs):

#         g=func(*args,**kwargs)

#         next(g)

#         return g

#     return warpper

#

#

# @init

# def eater(name):

#     print("%s eat " %(name))

#     food_list=[]

#     while True:

#         food=yield food_list

#         food_list.append(food)

#         print("%s eat %s" %(name,food))

#

#

# def make_shit(people,n):

#     for i in range(n):

#         people.send("shit %s" %i)

#

# e=eater("alex")

# make_shit(e,5)

#1.找到文件

#2.把文件找到 绝对路径 send(）-》

#3.遍历文件内容

#判断

import os

def init(func):

    def warpper(*args,**kwargs):

        g=func(*args,**kwargs)

        next(g)

        return g

    return warpper

# 阶段一：递归找文件绝对路径，把路径发给阶段二

def search(target, start_path):

    'serch file abpath'

    g = os.walk(start_path)

    for par_dir, _, files in g:

        # print(par_dir,files)

        for file in files:

            #file_path =r'%s\%s' % (par_dir, file)

            file_path = '%s%s' % (par_dir, file)

            #print(file_path)

            target.send(file_path)

# 阶段二：收到文件路径，打开文件获取对象，把文件对象发给阶段三

@init

def opener(target):

    'get file obj open(filepath)'

    while True:

        file_path = yield

        with open(file_path, encoding='utf-8') as f:

            target.send((file_path,f))

# 阶段三：收到文件对象，for循环读取文件的每一行内容，把每一行内容发给阶段四

@init

def cat(target):

    #  'cat file'

    while True:

        file_path, f = yield

        for line in f:

                target.send((file_path,line))

# 阶段四：收到一行内容，判断root是否在这一行中，如果在，则把文件名发给阶段五

@init

def grep(target, pattern):

    while True:

        file_path, line = yield

        if pattern in line:

            target.send(file_path)

# 阶段五：收到文件名打印结果

@init

def printer():

    # 'print function'

    while True:

        filename = yield

        print(filename)

start_path ='/Users/shuanggai/PycharmProjects/git/python/20170619_yield_recursion/homework/'

search(opener(cat(grep(printer(),'root'))),start_path)