apps/catalogue/templatetags/wall.py

   1 from __future__ import absolute_import
   2
   3 from datetime import timedelta
   4 from django.db.models import Q
   5 from django.core.urlresolvers import reverse
   6 from django.contrib.comments.models import Comment
   7 from django import template
   8 from django.utils.translation import ugettext as _
   9
  10 from catalogue.models import Chunk, BookPublishRecord
  11
  12 register = template.Library()
  13
  14
  15 class WallItem(object):
  16     title = ''
  17     summary = ''
  18     url = ''
  19     timestamp = ''
  20     user = None
  21     user_name = ''
  22     email = ''
  23
  24     def __init__(self, tag):
  25         self.tag = tag
  26
  27     def get_email(self):
  28         if self.user:
  29             return self.user.email
  30         else:
  31             return self.email
  32
  33
  34 def changes_wall(user=None, max_len=None, day=None):
  35     qs = Chunk.change_model.objects.order_by('-created_at')
  36     qs = qs.select_related('author', 'tree', 'tree__book__title')
  37     if user is not None:
  38         qs = qs.filter(Q(author=user) | Q(tree__user=user))
  39     if max_len is not None:
  40         qs = qs[:max_len]
  41     if day is not None:
  42         next_day = day + timedelta(1)
  43         qs = qs.filter(created_at__gte=day, created_at__lt=next_day)
  44     for item in qs:
  45         tag = 'stage' if item.tags.count() else 'change'
  46         chunk = item.tree
  47         w  = WallItem(tag)
  48         if user and item.author != user:
  49             w.header = _('Related edit')
  50         else:
  51             w.header = _('Edit')
  52         w.title = chunk.pretty_name()
  53         w.summary = item.description
  54         w.url = reverse('wiki_editor',
  55                 args=[chunk.book.slug, chunk.slug]) + '?diff=%d' % item.revision
  56         w.timestamp = item.created_at
  57         w.user = item.author
  58         w.user_name = item.author_name
  59         w.email = item.author_email
  60         yield w
  61
  62
  63 # TODO: marked for publishing
  64
  65
  66 def published_wall(user=None, max_len=None, day=None):
  67     qs = BookPublishRecord.objects.select_related('book__title')
  68     if user:
  69         # TODO: published my book
  70         qs = qs.filter(Q(user=user))
  71     if max_len is not None:
  72         qs = qs[:max_len]
  73     if day is not None:
  74         next_day = day + timedelta(1)
  75         qs = qs.filter(timestamp__gte=day, timestamp__lt=next_day)
  76     for item in qs:
  77         w = WallItem('publish')
  78         w.header = _('Publication')
  79         w.title = item.book.title
  80         w.timestamp = item.timestamp
  81         w.url = item.book.get_absolute_url()
  82         w.user = item.user
  83         w.email = item.user.email
  84         yield w
  85
  86
  87 def comments_wall(user=None, max_len=None, day=None):
  88     qs = Comment.objects.filter(is_public=True).select_related().order_by('-submit_date')
  89     if user:
  90         # TODO: comments concerning my books
  91         qs = qs.filter(Q(user=user))
  92     if max_len is not None:
  93         qs = qs[:max_len]
  94     if day is not None:
  95         next_day = day + timedelta(1)
  96         qs = qs.filter(submit_date__gte=day, submit_date__lt=next_day)
  97     for item in qs:
  98         w  = WallItem('comment')
  99         w.header = _('Comment')
 100         w.title = item.content_object
 101         w.summary = item.comment
 102         w.url = item.content_object.get_absolute_url()
 103         w.timestamp = item.submit_date
 104         w.user = item.user
 105         ui = item.userinfo
 106         w.email = item.email
 107         w.user_name = item.name
 108         yield w
 109
 110
 111 def big_wall(walls, max_len=None):
 112     """
 113         Takes some WallItem iterators and zips them into one big wall.
 114         Input iterators must already be sorted by timestamp.
 115     """
 116     subwalls = []
 117     for w in walls:
 118         try:
 119             subwalls.append([next(w), w])
 120         except StopIteration:
 121             pass
 122
 123     if max_len is None:
 124         max_len = -1
 125     while max_len and subwalls:
 126         i, next_item = max(enumerate(subwalls), key=lambda x: x[1][0].timestamp)
 127         yield next_item[0]
 128         max_len -= 1
 129         try:
 130             next_item[0] = next(next_item[1])
 131         except StopIteration:
 132             del subwalls[i]
 133
 134
 135 @register.inclusion_tag("catalogue/wall.html", takes_context=True)
 136 def wall(context, user=None, max_len=100):
 137     return {
 138         "request": context['request'],
 139         "STATIC_URL": context['STATIC_URL'],
 140         "wall": big_wall([
 141             changes_wall(user, max_len),
 142             published_wall(user, max_len),
 143             comments_wall(user, max_len),
 144         ], max_len)}
 145
 146 @register.inclusion_tag("catalogue/wall.html", takes_context=True)
 147 def day_wall(context, day):
 148     return {
 149         "request": context['request'],
 150         "STATIC_URL": context['STATIC_URL'],
 151         "wall": big_wall([
 152             changes_wall(day=day),
 153             published_wall(day=day),
 154             comments_wall(day=day),
 155         ])}