# coding=utf-8 
import urllib2
import sys, os
import re
import string
from BeautifulSoup import BeautifulSoup
def encode(s):
  return s.decode('utf-8').encode(sys.stdout.encoding, 'ignore')
def getHTML(url):
  #proxy_handler = urllib2.ProxyHandler({'http':'http://211.138.124.211:80'})
  #opener = urllib2.build_opener(proxy_handler)
  #urllib2.install_opener(opener)
  req = urllib2.Request(url)
  response = urllib2.urlopen(req, timeout=15)
  return BeautifulSoup(response, convertEntities=BeautifulSoup.HTML_ENTITIES)
def visible(element):
  '''抓取可见的文本元素'''
  if element.parent.name in ['style', 'script', '[document]', 'head', 'title']:
    return False
  elif re.match('<!--.*-->', str(element)):
    return False
  elif element == u'\xa0':
    return False
  return True
def delReturn(element):
  '''删除元素内的换行'''
  return re.sub('(?<!^)\n+(?!$)', ' ', str(element)).decode('utf-8')
def validFilename(filename):
  # windows
  return re.sub('[\/:*?<>"|\xa0]', '', filename)
def writeToFile(text, filename, dirname):
  if not os.path.exists(dirname):
    os.makedirs(dirname)
    print encode('保存到目录'), dirname
  filename = validFilename(filename)
  print encode('保存文章'), filename
  path = os.path.join(dirname, filename)
  if not os.path.exists(path):
    f = open(path, 'w')
    f.write(text)
    f.close()
  else:
    print filename, encode('已经存在')
def formatContent(url, title=''):
  '''格式化文章内容'''
  page = getHTML(url)
  content = page.find('div', {'class':'articalContent'})
  art_id = re.search('blog_(\w+)\.html', url).group(1)
  blog_name = page.find('span', id='blognamespan').string
  if title == '':
    title = page.find('h2', id=re.compile('^t_')).string
  temp_data = filter(visible, content.findAll(text=True)) # 去掉不可见元素
  temp_data = ''.join(map(delReturn, temp_data)) # 删除元素内的换行符
  temp_data = temp_data.strip() # 删除文章首尾的空行
  temp_data = re.sub('\n{2,}', '\n\n', temp_data) # 删除文章内过多的空行
  # 输出到文件
  # 编码问题
  temp_data = '本文地址:'.decode('utf-8') + url + '\n\n' + temp_data
  op_text = temp_data.encode('utf-8')
  op_file = title + '_' + art_id +'.txt'
  writeToFile(op_text, op_file, blog_name)
def articlelist(url):
  articles = {}
  page = getHTML(url)
  pages = page.find('ul', {'class':'SG_pages'}).span.string
  page_num = int(re.search('(\d+)', pages).group(1))
  for i in range(1, page_num+1):
    print encode('生成第%d页文章索引'%i)
    if i != 1:
      url = re.sub('(_)\d+(\.html)$', '\g<1>'+str(i)+'\g<2>', url)
      page = getHTML(url)
    article = page.findAll('span', {'class':'atc_title'})
    for art in article:
      art_title = art.a['title']
      art_href = art.a['href']
      articles[art_title] = art_href
  return articles
def blog_dld(articles):
  if not isinstance(articles, dict):
    return False
  print encode('开始下载文章')
  for art_title, art_href in articles.items():
    formatContent(art_href, art_title)
if __name__ == '__main__':
  sel = raw_input(encode('你要下载的是(1)全部文章还是(2)单篇文章，输入1或者2: '))
  if sel == '1':
    #articlelist_url = 'http://blog.sina.com.cn/s/articlelist_1303481411_0_1.html'
    articlelist_url = raw_input(encode('请输入博客文章目录链接: '))
    articles = articlelist(articlelist_url)
    blog_dld(articles)
  else:
    #article_url = 'http://blog.sina.com.cn/s/blog_4db18c430100gxc5.html'
    article_url = raw_input(encode('请输入博客文章链接: '))
    formatContent(article_url)