--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gpp/forums/views/main.py	Sun Aug 01 21:26:12 2010 +0000
@@ -0,0 +1,956 @@
+"""
+Views for the forums application.
+"""
+import datetime
+
+from django.contrib.auth.decorators import login_required
+from django.contrib.auth.models import User
+from django.http import Http404
+from django.http import HttpResponse
+from django.http import HttpResponseBadRequest
+from django.http import HttpResponseForbidden
+from django.http import HttpResponseRedirect
+from django.core.urlresolvers import reverse
+from django.core.paginator import InvalidPage
+from django.shortcuts import get_object_or_404
+from django.shortcuts import render_to_response
+from django.shortcuts import redirect
+from django.template.loader import render_to_string
+from django.template import RequestContext
+from django.views.decorators.http import require_POST
+from django.utils.text import wrap
+from django.db.models import F
+
+from core.paginator import DiggPaginator
+from core.functions import email_admins
+from forums.models import Forum, Topic, Post, FlaggedPost, TopicLastVisit, \
+        ForumLastVisit
+from forums.forms import NewTopicForm, NewPostForm, PostForm, MoveTopicForm, \
+        SplitTopicForm
+from forums.unread import get_forum_unread_status, get_topic_unread_status, \
+        get_post_unread_status, get_unread_topics
+
+from bio.models import UserProfile
+import antispam
+import antispam.utils
+
+#######################################################################
+
+TOPICS_PER_PAGE = 50
+POSTS_PER_PAGE = 20
+
+
+def get_page_num(request):
+    """Returns the value of the 'page' variable in GET if it exists, or 1
+    if it does not."""
+
+    try:
+        page_num = int(request.GET.get('page', 1))
+    except ValueError:
+        page_num = 1
+
+    return page_num
+
+
+def create_topic_paginator(topics):
+   return DiggPaginator(topics, TOPICS_PER_PAGE, body=5, tail=2, margin=3, padding=2)
+
+def create_post_paginator(posts):
+   return DiggPaginator(posts, POSTS_PER_PAGE, body=5, tail=2, margin=3, padding=2)
+
+
+def attach_topic_page_ranges(topics):
+    """Attaches a page_range attribute to each topic in the supplied list.
+    This attribute will be None if it is a single page topic. This is used
+    by the templates to generate "goto page x" links.
+    """
+    for topic in topics:
+        if topic.post_count > POSTS_PER_PAGE:
+            pp = DiggPaginator(range(topic.post_count), POSTS_PER_PAGE, 
+                    body=2, tail=3, margin=1)
+            topic.page_range = pp.page(1).page_range
+        else:
+            topic.page_range = None
+
+#######################################################################
+
+SPECIAL_QUERIES = {
+    'unread': 'forums-unread_topics',
+    'unanswered': 'forums-unanswered_topics',
+    'mine': 'forums-my_posts',
+    'favorites': 'forums-manage_favorites',
+    'subscriptions': 'forums-manage_subscriptions',
+}
+
+def index(request):
+    """
+    This view displays all the forums available, ordered in each category.
+    """
+    # check for special forum queries
+    query = request.GET.get("query")
+    if query in SPECIAL_QUERIES:
+        return redirect(SPECIAL_QUERIES[query])
+
+    public_forums = Forum.objects.public_forums()
+    feeds = [{'name': 'All Forums', 'feed': '/feeds/forums/'}]
+
+    forums = Forum.objects.forums_for_user(request.user)
+    get_forum_unread_status(forums, request.user)
+    cats = {}
+    for forum in forums:
+        forum.has_feed = forum in public_forums
+        if forum.has_feed:
+            feeds.append({
+                'name': '%s Forum' % forum.name,
+                'feed': '/feeds/forums/%s/' % forum.slug,
+                })
+
+        cat = cats.setdefault(forum.category.id, {
+            'cat': forum.category,
+            'forums': [],
+            })
+        cat['forums'].append(forum)
+
+    cmpdef = lambda a, b: cmp(a['cat'].position, b['cat'].position)
+    cats = sorted(cats.values(), cmpdef)
+
+    return render_to_response('forums/index.html', {
+        'cats': cats,
+        'feeds': feeds,
+        },
+        context_instance=RequestContext(request))
+
+
+def forum_index(request, slug):
+    """
+    Displays all the topics in a forum.
+    """
+    forum = get_object_or_404(Forum.objects.select_related(), slug=slug)
+
+    if not forum.category.can_access(request.user):
+        return HttpResponseForbidden()
+
+    topics = forum.topics.select_related('user', 'last_post', 'last_post__user')
+    get_topic_unread_status(forum, topics, request.user)
+
+    paginator = create_topic_paginator(topics)
+    page_num = get_page_num(request)
+    try:
+        page = paginator.page(page_num)
+    except InvalidPage:
+        raise Http404
+
+    attach_topic_page_ranges(page.object_list)
+
+    # we do this for the template since it is rendered twice
+    page_nav = render_to_string('forums/pagination.html', {'page': page})
+
+    can_moderate = _can_moderate(forum, request.user)
+    
+    return render_to_response('forums/forum_index.html', {
+        'forum': forum,
+        'page': page,
+        'page_nav': page_nav,
+        'can_moderate': can_moderate,
+        },
+        context_instance=RequestContext(request))
+
+
+def topic_index(request, id):
+    """
+    Displays all the posts in a topic.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(
+        'forum', 'forum__category', 'last_post'), pk=id)
+
+    if not topic.forum.category.can_access(request.user):
+        return HttpResponseForbidden()
+
+    topic.view_count = F('view_count') + 1
+    topic.save(force_update=True)
+
+    posts = topic.posts.select_related()
+
+    paginator = create_post_paginator(posts)
+    page_num = get_page_num(request)
+    try:
+        page = paginator.page(page_num)
+    except InvalidPage:
+        raise Http404
+    get_post_unread_status(topic, page.object_list, request.user)
+
+    # Attach user profiles to each post to avoid using get_user_profile() in
+    # the template.
+    users = set(post.user.id for post in page.object_list)
+
+    profiles = UserProfile.objects.filter(user__id__in=users).select_related()
+    user_profiles = dict((profile.user.id, profile) for profile in profiles)
+
+    for post in page.object_list:
+        post.user_profile = user_profiles[post.user.id]
+
+    last_page = page_num == paginator.num_pages
+
+    if request.user.is_authenticated() and last_page:
+        _update_last_visit(request.user, topic)
+
+    # we do this for the template since it is rendered twice
+    page_nav = render_to_string('forums/pagination.html', {'page': page})
+
+    can_moderate = _can_moderate(topic.forum, request.user)
+
+    can_reply = request.user.is_authenticated() and (
+        not topic.locked or can_moderate)
+
+    is_favorite = request.user.is_authenticated() and (
+            topic in request.user.favorite_topics.all())
+
+    is_subscribed = request.user.is_authenticated() and (
+            topic in request.user.subscriptions.all())
+
+    return render_to_response('forums/topic.html', {
+        'forum': topic.forum,
+        'topic': topic,
+        'page': page,
+        'page_nav': page_nav,
+        'last_page': last_page,
+        'can_moderate': can_moderate,
+        'can_reply': can_reply,
+        'form': NewPostForm(initial={'topic_id': topic.id}),
+        'is_favorite': is_favorite,
+        'is_subscribed': is_subscribed,
+        },
+        context_instance=RequestContext(request))
+
+
+@login_required
+def new_topic(request, slug):
+    """
+    This view handles the creation of new topics.
+    """
+    forum = get_object_or_404(Forum.objects.select_related(), slug=slug)
+
+    if not forum.category.can_access(request.user):
+        return HttpResponseForbidden()
+
+    if request.method == 'POST':
+        form = NewTopicForm(request.user, forum, request.POST)
+        if form.is_valid():
+            if antispam.utils.spam_check(request, form.cleaned_data['body']):
+                return HttpResponseRedirect(reverse('antispam-suspended'))
+
+            topic = form.save(request.META.get("REMOTE_ADDR"))
+            _bump_post_count(request.user)
+            return HttpResponseRedirect(reverse('forums-new_topic_thanks',
+                                            kwargs={'tid': topic.pk}))
+    else:
+        form = NewTopicForm(request.user, forum)
+    
+    return render_to_response('forums/new_topic.html', {
+        'forum': forum,
+        'form': form,
+        },
+        context_instance=RequestContext(request))
+
+
+@login_required
+def new_topic_thanks(request, tid):
+    """
+    This view displays the success page for a newly created topic.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(), pk=tid)
+    return render_to_response('forums/new_topic_thanks.html', {
+        'forum': topic.forum,
+        'topic': topic,
+        },
+        context_instance=RequestContext(request))
+
+
+@require_POST
+def quick_reply_ajax(request):
+    """
+    This function handles the quick reply to a thread function. This
+    function is meant to be the target of an AJAX post, and returns
+    the HTML for the new post, which the client-side script appends
+    to the document.
+    """
+    if not request.user.is_authenticated():
+        return HttpResponseForbidden('Please login or register to post.')
+
+    form = NewPostForm(request.POST)
+    if form.is_valid():
+        if not _can_post_in_topic(form.topic, request.user):
+            return HttpResponseForbidden("You don't have permission to post in this topic.")
+        if antispam.utils.spam_check(request, form.cleaned_data['body']):
+            return HttpResponseForbidden(antispam.BUSTED_MESSAGE)
+
+        post = form.save(request.user, request.META.get("REMOTE_ADDR", ""))
+        post.unread = True
+        post.user_profile = request.user.get_profile()
+        _bump_post_count(request.user)
+        _update_last_visit(request.user, form.topic)
+        return render_to_response('forums/display_post.html', {
+            'post': post,
+            'can_moderate': _can_moderate(form.topic.forum, request.user),
+            'can_reply': True,
+            },
+            context_instance=RequestContext(request))
+
+    return HttpResponseBadRequest("Invalid post.");
+
+
+def goto_post(request, post_id):
+    """
+    This function calculates what page a given post is on, then redirects
+    to that URL. This function is the target of get_absolute_url() for
+    Post objects.
+    """
+    post = get_object_or_404(Post.objects.select_related(), pk=post_id)
+    count = post.topic.posts.filter(creation_date__lt=post.creation_date).count()
+    page = count / POSTS_PER_PAGE + 1
+    url = reverse('forums-topic_index', kwargs={'id': post.topic.id}) + \
+        '?page=%s#p%s' % (page, post.id)
+    return HttpResponseRedirect(url)
+
+
+@require_POST
+def flag_post(request):
+    """
+    This function handles the flagging of posts by users. This function should
+    be the target of an AJAX post.
+    """
+    if not request.user.is_authenticated():
+        return HttpResponseForbidden('Please login or register to flag a post.')
+
+    id = request.POST.get('id')
+    if id is None:
+        return HttpResponseBadRequest('No post id')
+
+    try:
+        post = Post.objects.get(pk=id)
+    except Post.DoesNotExist:
+        return HttpResponseBadRequest('No post with id %s' % id)
+
+    flag = FlaggedPost(user=request.user, post=post)
+    flag.save()
+    email_admins('A Post Has Been Flagged', """Hello,
+
+A user has flagged a forum post for review.
+""")
+    return HttpResponse('The post was flagged. A moderator will review the post shortly. ' \
+            'Thanks for helping to improve the discussions on this site.')
+
+
+@login_required
+def edit_post(request, id):
+    """
+    This view function allows authorized users to edit posts.
+    The superuser, forum moderators, and original author can edit posts.
+    """
+    post = get_object_or_404(Post.objects.select_related(), pk=id)
+
+    can_moderate = _can_moderate(post.topic.forum, request.user)
+    can_edit = can_moderate or request.user == post.user
+
+    if not can_edit:
+        return HttpResponseForbidden("You don't have permission to edit that post.")
+
+    if request.method == "POST":
+        form = PostForm(request.POST, instance=post)
+        if form.is_valid():
+            if antispam.utils.spam_check(request, form.cleaned_data['body']):
+                return HttpResponseRedirect(reverse('antispam-suspended'))
+            post = form.save(commit=False)
+            post.touch()
+            post.save()
+            return HttpResponseRedirect(post.get_absolute_url())
+    else:
+        form = PostForm(instance=post)
+
+    post.user_profile = request.user.get_profile()
+
+    return render_to_response('forums/edit_post.html', {
+        'forum': post.topic.forum,
+        'topic': post.topic,
+        'post': post,
+        'form': form,
+        'can_moderate': can_moderate,
+        },
+        context_instance=RequestContext(request))
+
+
+@require_POST
+def delete_post(request):
+    """
+    This view function allows superusers and forum moderators to delete posts.
+    This function is the target of AJAX calls from the client.
+    """
+    if not request.user.is_authenticated():
+        return HttpResponseForbidden('Please login to delete a post.')
+
+    id = request.POST.get('id')
+    if id is None:
+        return HttpResponseBadRequest('No post id')
+
+    post = get_object_or_404(Post.objects.select_related(), pk=id)
+
+    can_delete = request.user.is_superuser or \
+            request.user in post.topic.forum.moderators.all()
+
+    if not can_delete:
+        return HttpResponseForbidden("You don't have permission to delete that post.")
+
+    delete_single_post(post)
+    return HttpResponse("The post has been deleted.")
+
+
+def delete_single_post(post):
+    """
+    This function deletes a single post. It handles the case of where
+    a post is the sole post in a topic by deleting the topic also. It
+    adjusts any foreign keys in Topic or Forum objects that might be pointing
+    to this post before deleting the post to avoid a cascading delete.
+    """
+    if post.topic.post_count == 1 and post == post.topic.last_post:
+        _delete_topic(post.topic)
+    else:
+        _delete_post(post)
+
+
+def _delete_post(post):
+    """
+    Internal function to delete a single post object.
+    Decrements the post author's post count.
+    Adjusts the parent topic and forum's last_post as needed.
+    """
+    # Adjust post creator's post count
+    profile = post.user.get_profile()
+    if profile.forum_post_count > 0:
+        profile.forum_post_count -= 1
+        profile.save()
+
+    # If this post is the last_post in a topic, we need to update
+    # both the topic and parent forum's last post fields. If we don't
+    # the cascading delete will delete them also!
+
+    topic = post.topic
+    if topic.last_post == post:
+        topic.last_post_pre_delete()
+        topic.save()
+
+    forum = topic.forum
+    if forum.last_post == post:
+        forum.last_post_pre_delete()
+        forum.save()
+
+    # Should be safe to delete the post now:
+    post.delete()
+
+
+def _delete_topic(topic):
+    """
+    Internal function to delete an entire topic.
+    Deletes the topic and all posts contained within.
+    Adjusts the parent forum's last_post as needed.
+    Note that we don't bother adjusting all the users'
+    post counts as that doesn't seem to be worth the effort.
+    """
+    if topic.forum.last_post and topic.forum.last_post.topic == topic:
+        topic.forum.last_post_pre_delete()
+        topic.forum.save()
+
+    # delete subscriptions to this topic
+    topic.subscribers.clear()
+    topic.bookmarkers.clear()
+
+    # It should be safe to just delete the topic now. This will
+    # automatically delete all posts in the topic.
+    topic.delete()
+
+
+@login_required
+def new_post(request, topic_id):
+    """
+    This function is the view for creating a normal, non-quick reply
+    to a topic.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(), pk=topic_id)
+    can_post = _can_post_in_topic(topic, request.user)
+
+    if can_post:
+        if request.method == 'POST':
+            form = PostForm(request.POST)
+            if form.is_valid():
+                if antispam.utils.spam_check(request, form.cleaned_data['body']):
+                    return HttpResponseRedirect(reverse('antispam-suspended'))
+                post = form.save(commit=False)
+                post.topic = topic
+                post.user = request.user
+                post.user_ip = request.META.get("REMOTE_ADDR", "")
+                post.save()
+                _bump_post_count(request.user)
+                _update_last_visit(request.user, topic)
+                return HttpResponseRedirect(post.get_absolute_url())
+        else:
+            quote_id = request.GET.get('quote')
+            if quote_id:
+                quote_post = get_object_or_404(Post.objects.select_related(),
+                        pk=quote_id)
+                form = PostForm(initial={'body': _quote_message(quote_post.user.username,
+                    quote_post.body)})
+            else:
+                form = PostForm()
+    else:
+        form = None
+
+    return render_to_response('forums/new_post.html', {
+        'forum': topic.forum,
+        'topic': topic,
+        'form': form,
+        'can_post': can_post,
+        },
+        context_instance=RequestContext(request))
+
+
+@login_required
+def mod_topic_stick(request, id):
+    """
+    This view function is for moderators to toggle the sticky status of a topic.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(), pk=id)
+    if _can_moderate(topic.forum, request.user):
+        topic.sticky = not topic.sticky
+        topic.save()
+        return HttpResponseRedirect(topic.get_absolute_url())
+
+    return HttpResponseForbidden()
+
+
+@login_required
+def mod_topic_lock(request, id):
+    """
+    This view function is for moderators to toggle the locked status of a topic.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(), pk=id)
+    if _can_moderate(topic.forum, request.user):
+        topic.locked = not topic.locked
+        topic.save()
+        return HttpResponseRedirect(topic.get_absolute_url())
+
+    return HttpResponseForbidden()
+
+
+@login_required
+def mod_topic_delete(request, id):
+    """
+    This view function is for moderators to delete an entire topic.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(), pk=id)
+    if _can_moderate(topic.forum, request.user):
+        forum_url = topic.forum.get_absolute_url()
+        _delete_topic(topic)
+        return HttpResponseRedirect(forum_url)
+
+    return HttpResponseForbidden()
+
+
+@login_required
+def mod_topic_move(request, id):
+    """
+    This view function is for moderators to move a topic to a different forum.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(), pk=id)
+    if not _can_moderate(topic.forum, request.user):
+        return HttpResponseForbidden()
+
+    if request.method == 'POST':
+        form = MoveTopicForm(request.user, request.POST)
+        if form.is_valid():
+            new_forum = form.cleaned_data['forums']
+            old_forum = topic.forum
+            _move_topic(topic, old_forum, new_forum)
+            return HttpResponseRedirect(topic.get_absolute_url())
+    else:
+        form = MoveTopicForm(request.user)
+
+    return render_to_response('forums/move_topic.html', {
+        'forum': topic.forum,
+        'topic': topic,
+        'form': form,
+        },
+        context_instance=RequestContext(request))
+
+
+@login_required
+def mod_forum(request, slug):
+    """
+    Displays a view to allow moderators to perform various operations
+    on topics in a forum in bulk. We currently support mass locking/unlocking,
+    stickying and unstickying, moving, and deleting topics.
+    """
+    forum = get_object_or_404(Forum.objects.select_related(), slug=slug)
+    if not _can_moderate(forum, request.user):
+        return HttpResponseForbidden()
+
+    topics = forum.topics.select_related('user', 'last_post', 'last_post__user')
+    paginator = create_topic_paginator(topics)
+    page_num = get_page_num(request)
+    try:
+        page = paginator.page(page_num)
+    except InvalidPage:
+        raise Http404
+
+    # we do this for the template since it is rendered twice
+    page_nav = render_to_string('forums/pagination.html', {'page': page})
+    form = None
+
+    if request.method == 'POST':
+        topic_ids = request.POST.getlist('topic_ids')
+        url = reverse('forums-mod_forum', kwargs={'slug':forum.slug})
+        url += '?page=%s' % page_num
+
+        if len(topic_ids):
+            if request.POST.get('sticky'):
+                _bulk_sticky(forum, topic_ids)
+                return HttpResponseRedirect(url)
+            elif request.POST.get('lock'):
+                _bulk_lock(forum, topic_ids)
+                return HttpResponseRedirect(url)
+            elif request.POST.get('delete'):
+                _bulk_delete(forum, topic_ids)
+                return HttpResponseRedirect(url)
+            elif request.POST.get('move'):
+                form = MoveTopicForm(request.user, request.POST, hide_label=True)
+                if form.is_valid():
+                    _bulk_move(topic_ids, forum, form.cleaned_data['forums'])
+                    return HttpResponseRedirect(url)
+    
+    if form is None:
+        form = MoveTopicForm(request.user, hide_label=True)
+
+    return render_to_response('forums/mod_forum.html', {
+        'forum': forum,
+        'page': page,
+        'page_nav': page_nav,
+        'form': form,
+        },
+        context_instance=RequestContext(request))
+
+
+@login_required
+@require_POST
+def forum_catchup(request, slug):
+    """
+    This view marks all the topics in the forum as being read.
+    """
+    forum = get_object_or_404(Forum.objects.select_related(), slug=slug)
+
+    if not forum.category.can_access(request.user):
+        return HttpResponseForbidden()
+
+    forum.catchup(request.user)
+    return HttpResponseRedirect(forum.get_absolute_url())
+
+
+@login_required
+def mod_topic_split(request, id):
+    """
+    This view function allows moderators to split posts off to a new topic.
+    """
+    topic = get_object_or_404(Topic.objects.select_related(), pk=id)
+    if not _can_moderate(topic.forum, request.user):
+        return HttpResponseRedirect(topic.get_absolute_url())
+
+    if request.method == "POST":
+        form = SplitTopicForm(request.user, request.POST)
+        if form.is_valid():
+            if form.split_at:
+                _split_topic_at(topic, form.post_ids[0],
+                        form.cleaned_data['forums'],
+                        form.cleaned_data['name'])
+            else:
+                _split_topic(topic, form.post_ids,
+                        form.cleaned_data['forums'],
+                        form.cleaned_data['name'])
+
+            return HttpResponseRedirect(topic.get_absolute_url())
+    else:
+        form = SplitTopicForm(request.user)
+
+    posts = topic.posts.select_related()
+
+    return render_to_response('forums/mod_split_topic.html', {
+        'forum': topic.forum,
+        'topic': topic,
+        'posts': posts,
+        'form': form,
+        },
+        context_instance=RequestContext(request))
+
+
+@login_required
+def unread_topics(request):
+    """Displays the topics with unread posts for a given user."""
+
+    topics = get_unread_topics(request.user)
+
+    paginator = create_topic_paginator(topics)
+    page_num = get_page_num(request)
+    try:
+        page = paginator.page(page_num)
+    except InvalidPage:
+        raise Http404
+
+    attach_topic_page_ranges(page.object_list)
+
+    # we do this for the template since it is rendered twice
+    page_nav = render_to_string('forums/pagination.html', {'page': page})
+
+    return render_to_response('forums/topic_list.html', {
+        'title': 'Topics With Unread Posts',
+        'page': page,
+        'page_nav': page_nav,
+        },
+        context_instance=RequestContext(request))
+
+
+def unanswered_topics(request):
+    """Displays the topics with no replies."""
+
+    forum_ids = Forum.objects.forum_ids_for_user(request.user)
+    topics = Topic.objects.filter(forum__id__in=forum_ids,
+            post_count=1).select_related(
+                    'forum', 'user', 'last_post', 'last_post__user')
+
+    paginator = create_topic_paginator(topics)
+    page_num = get_page_num(request)
+    try:
+        page = paginator.page(page_num)
+    except InvalidPage:
+        raise Http404
+
+    attach_topic_page_ranges(page.object_list)
+
+    # we do this for the template since it is rendered twice
+    page_nav = render_to_string('forums/pagination.html', {'page': page})
+
+    return render_to_response('forums/topic_list.html', {
+        'title': 'Unanswered Topics',
+        'page': page,
+        'page_nav': page_nav,
+        },
+        context_instance=RequestContext(request))
+
+
+@login_required
+def my_posts(request):
+    """Displays a list of posts the requesting user made."""
+    return _user_posts(request, request.user, request.user, 'My Posts')
+
+
+@login_required
+def posts_for_user(request, username):
+    """Displays a list of posts by the given user.
+    Only the forums that the requesting user can see are examined.
+    """
+    target_user = get_object_or_404(User, username=username)
+    return _user_posts(request, target_user, request.user, 'Posts by %s' % username)
+
+
+@login_required
+def post_ip_info(request, post_id):
+    """Displays information about the IP address the post was made from."""
+    post = get_object_or_404(Post.objects.select_related(), pk=post_id)
+
+    if not _can_moderate(post.topic.forum, request.user):
+        return HttpResponseForbidden("You don't have permission for this post.")
+
+    ip_users = sorted(set(Post.objects.filter(
+        user_ip=post.user_ip).values_list('user__username', flat=True)))
+
+    return render_to_response('forums/post_ip.html', {
+        'post': post,
+        'ip_users': ip_users,
+        },
+        context_instance=RequestContext(request))
+
+
+def _user_posts(request, target_user, req_user, page_title):
+    """Displays a list of posts made by the target user. 
+    req_user is the user trying to view the posts. Only the forums
+    req_user can see are searched.
+    """
+    forum_ids = Forum.objects.forum_ids_for_user(req_user)
+    posts = Post.objects.filter(user=target_user,
+            topic__forum__id__in=forum_ids).order_by(
+                    '-creation_date').select_related()
+
+    paginator = create_post_paginator(posts)
+    page_num = get_page_num(request)
+    try:
+        page = paginator.page(page_num)
+    except InvalidPage:
+        raise Http404
+
+    # we do this for the template since it is rendered twice
+    page_nav = render_to_string('forums/pagination.html', {'page': page})
+
+    return render_to_response('forums/post_list.html', {
+        'title': page_title,
+        'page': page,
+        'page_nav': page_nav,
+        },
+        context_instance=RequestContext(request))
+
+
+def _can_moderate(forum, user):
+    """
+    Determines if a user has permission to moderate a given forum.
+    """
+    return user.is_authenticated() and (
+            user.is_superuser or user in forum.moderators.all())
+
+
+def _can_post_in_topic(topic, user):
+    """
+    This function returns true if the given user can post in the given topic
+    and false otherwise.
+    """
+    return (not topic.locked and topic.forum.category.can_access(user)) or \
+            (user.is_superuser or user in topic.forum.moderators.all())
+
+
+def _bump_post_count(user):
+    """
+    Increments the forum_post_count for the given user.
+    """
+    profile = user.get_profile()
+    profile.forum_post_count += 1
+    profile.save()
+
+
+def _quote_message(who, message):
+    """
+    Builds a message reply by quoting the existing message in a
+    typical email-like fashion. The quoting is compatible with Markdown.
+    """
+    header = '*%s wrote:*\n\n' % (who, )
+    lines = wrap(message, 55).split('\n')
+    for i, line in enumerate(lines):
+        lines[i] = '> ' + line
+    return header + '\n'.join(lines)
+
+
+def _move_topic(topic, old_forum, new_forum):
+    if new_forum != old_forum:
+        topic.forum = new_forum
+        topic.save()
+        # Have to adjust foreign keys to last_post, denormalized counts, etc.:
+        old_forum.sync()
+        old_forum.save()
+        new_forum.sync()
+        new_forum.save()
+
+
+def _bulk_sticky(forum, topic_ids):
+    """
+    Performs a toggle on the sticky status for a given list of topic ids.
+    """
+    topics = Topic.objects.filter(pk__in=topic_ids)
+    for topic in topics:
+        if topic.forum == forum:
+            topic.sticky = not topic.sticky
+            topic.save()
+
+
+def _bulk_lock(forum, topic_ids):
+    """
+    Performs a toggle on the locked status for a given list of topic ids.
+    """
+    topics = Topic.objects.filter(pk__in=topic_ids)
+    for topic in topics:
+        if topic.forum == forum:
+            topic.locked = not topic.locked
+            topic.save()
+
+
+def _bulk_delete(forum, topic_ids):
+    """
+    Deletes the list of topics.
+    """
+    topics = Topic.objects.filter(pk__in=topic_ids).select_related()
+    for topic in topics:
+        if topic.forum == forum:
+            _delete_topic(topic)
+
+
+def _bulk_move(topic_ids, old_forum, new_forum):
+    """
+    Moves the list of topics to a new forum.
+    """
+    topics = Topic.objects.filter(pk__in=topic_ids).select_related()
+    for topic in topics:
+        if topic.forum == old_forum:
+            _move_topic(topic, old_forum, new_forum)
+
+
+def _update_last_visit(user, topic):
+    """
+    Does the bookkeeping for the last visit status for the user to the
+    topic/forum.
+    """
+    now = datetime.datetime.now()
+    try:
+        flv = ForumLastVisit.objects.get(user=user, forum=topic.forum)
+    except ForumLastVisit.DoesNotExist:
+        flv = ForumLastVisit(user=user, forum=topic.forum)
+        flv.begin_date = now
+
+    flv.end_date = now
+    flv.save()
+
+    if topic.update_date > flv.begin_date:
+        try:
+            tlv = TopicLastVisit.objects.get(user=user, topic=topic)
+        except TopicLastVisit.DoesNotExist:
+            tlv = TopicLastVisit(user=user, topic=topic)
+
+        tlv.touch()
+        tlv.save()
+
+
+def _split_topic_at(topic, post_id, new_forum, new_name):
+    """
+    This function splits the post given by post_id and all posts that come
+    after it in the given topic to a new topic in a new forum.
+    It is assumed the caller has been checked for moderator rights.
+    """
+    post = get_object_or_404(Post, id=post_id)
+    if post.topic == topic:
+        post_ids = Post.objects.filter(topic=topic,
+                creation_date__gte=post.creation_date).values_list('id', flat=True)
+        _split_topic(topic, post_ids, new_forum, new_name)
+
+
+def _split_topic(topic, post_ids, new_forum, new_name):
+    """
+    This function splits the posts given by the post_ids list in the
+    given topic to a new topic in a new forum.
+    It is assumed the caller has been checked for moderator rights.
+    """
+    posts = Post.objects.filter(topic=topic, id__in=post_ids)
+    if len(posts) > 0:
+        new_topic = Topic(forum=new_forum, name=new_name, user=posts[0].user)
+        new_topic.save()
+        for post in posts:
+            post.topic = new_topic
+            post.save()
+        
+        topic.post_count_update()
+        topic.save()
+        new_topic.post_count_update()
+        new_topic.save()
+        topic.forum.sync()
+        topic.forum.save()
+        new_forum.sync()
+        new_forum.save()