Index page with uploader and list of existing depositions.

def index():
    """Index page with uploader and list of existing depositions."""
    ctx = mycommunities_ctx()

    p = request.args.get('p', type=str)
    so = request.args.get('so', type=str)
    page = request.args.get('page', type=int, default=1)

    so = so or current_app.config.get('COMMUNITIES_DEFAULT_SORTING_OPTION')

    communities = Community.filter_communities(p, so)
    featured_community = FeaturedCommunity.get_featured_or_none()
    form = SearchForm(p=p)
    per_page = 10
    page = max(page, 1)
    p = Pagination(page, per_page, communities.count())

    ctx.update({
        'r_from': max(p.per_page * (p.page - 1), 0),
        'r_to': min(p.per_page * p.page, p.total_count),
        'r_total': p.total_count,
        'pagination': p,
        'form': form,
        'title': _('Communities'),
        'communities': communities.slice(
            per_page * (page - 1), per_page * page).all(),
        'featured_community': featured_community,
    })

    return render_template(
        current_app.config['COMMUNITIES_INDEX_TEMPLATE'], **ctx)