nearly working version

[redakcja.git] / apps / catalogue / templatetags / wall.py

diff --git a/apps/catalogue/templatetags/wall.py b/apps/catalogue/templatetags/wall.py
new file mode 100755 (executable)
index 0000000..5236eed
--- /dev/null
+++ b/apps/catalogue/templatetags/wall.py
@@ -0,0 +1,125 @@
+from __future__ import absolute_import
+
+from django.db.models import Q
+from django.core.urlresolvers import reverse
+from django.contrib.comments.models import Comment
+from django import template
+from django.utils.translation import ugettext as _
+
+from catalogue.models import Chunk, BookPublishRecord
+
+register = template.Library()
+
+
+class WallItem(object):
+    title = ''
+    summary = ''
+    url = ''
+    timestamp = ''
+    user = None
+    email = ''
+
+    def __init__(self, tag):
+        self.tag = tag
+
+    def get_email(self):
+        if self.user:
+            return self.user.email
+        else:
+            return self.email
+
+
+def changes_wall(user, max_len):
+    qs = Chunk.change_model.objects.filter(revision__gt=-1).order_by('-created_at')
+    qs = qs.select_related('author', 'tree', 'tree__book__title')
+    if user:
+        qs = qs.filter(Q(author=user) | Q(tree__user=user))
+    qs = qs[:max_len]
+    for item in qs:
+        tag = 'stage' if item.tags.count() else 'change'
+        chunk = item.tree
+        w  = WallItem(tag)
+        if user and item.author != user:
+            w.header = _('Related edit')
+        else:
+            w.header = _('Edit')
+        w.title = chunk.pretty_name()
+        w.summary = item.description
+        w.url = reverse('wiki_editor', 
+                args=[chunk.book.slug, chunk.slug]) + '?diff=%d' % item.revision
+        w.timestamp = item.created_at
+        w.user = item.author
+        w.email = item.author_email
+        yield w
+
+
+# TODO: marked for publishing
+
+
+def published_wall(user, max_len):
+    qs = BookPublishRecord.objects.select_related('book__title')
+    if user:
+        # TODO: published my book
+        qs = qs.filter(Q(user=user))
+    qs = qs[:max_len]
+    for item in qs:
+        w = WallItem('publish')
+        w.header = _('Publication')
+        w.title = item.book.title
+        w.timestamp = item.timestamp
+        w.url = item.book.get_absolute_url()
+        w.user = item.user
+        w.email = item.user.email
+        yield w
+
+
+def comments_wall(user, max_len):
+    qs = Comment.objects.filter(is_public=True).select_related().order_by('-submit_date')
+    if user:
+        # TODO: comments concerning my books
+        qs = qs.filter(Q(user=user))
+    qs = qs[:max_len]
+    for item in qs:
+        w  = WallItem('comment')
+        w.header = _('Comment')
+        w.title = item.content_object
+        w.summary = item.comment
+        w.url = item.content_object.get_absolute_url()
+        w.timestamp = item.submit_date
+        w.user = item.user
+        w.email = item.user_email
+        yield w
+
+
+def big_wall(max_len, *args):
+    """
+        Takes some WallItem iterators and zips them into one big wall.
+        Input iterators must already be sorted by timestamp.
+    """
+    subwalls = []
+    for w in args:
+        try:
+            subwalls.append([next(w), w])
+        except StopIteration:
+            pass
+
+    while max_len and subwalls:
+        i, next_item = max(enumerate(subwalls), key=lambda x: x[1][0].timestamp)
+        yield next_item[0]
+        max_len -= 1
+        try:
+            next_item[0] = next(next_item[1])
+        except StopIteration:
+            del subwalls[i]
+
+
+@register.inclusion_tag("catalogue/wall.html", takes_context=True)
+def wall(context, user=None, max_len=100):
+    return {
+        "request": context['request'],
+        "STATIC_URL": context['STATIC_URL'],
+        "wall": big_wall(max_len,
+            changes_wall(user, max_len),
+            published_wall(user, max_len),
+            comments_wall(user, max_len),
+        )}