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import re
import os
import sys

from datetime import datetime

from ethertoff.settings import MEDIA_ROOT
from etherpadlite.models import Pad, PadAuthor, PadServer
from django.contrib.auth.models import AnonymousUser
from django.contrib.sites.shortcuts import get_current_site


class EthertoffError(Exception):
    pass

def site_name(request):
    if 'admin' in request.path:
        return {}
    current_site = get_current_site(request)
    # maybe something that sounds more to the point than stite_name?
    # project_name? wiki_name?
    return { 'site_name' : current_site.name }


def pads(request):
    hash = {}
    if 'admin' in request.path:
        return hash
    # If the user is logged in:
    if hasattr(request, 'user') and not isinstance(request.user, AnonymousUser):
        # This magic exists to synch between the django author and the etherpad author
        try:  # Retrieve the corresponding padauthor object
            author = PadAuthor.objects.get(user=request.user)
        except PadAuthor.DoesNotExist:
            if len(PadServer.objects.all()) == 0:
                raise EthertoffError("In trying to associate the author to Etherpad, Ethertoff did not find a suitable pad server. In the admin, you need to create a PadServer object that contains the address of your etherpad install.")
            author = PadAuthor(
                user=request.user,
                server=PadServer.objects.all().reverse()[0]
            )
            author.save()
        author.GroupSynch()
        if author.group.count() == 0:
            raise EthertoffError("This user needs to be associated to a group (that in turn needs to be associated to an Etherpad group).")
        hash['author'] = author
    hash['pads'] = Pad.objects.all()
    return hash

def local(request):
    try:
        return { 'LOCAL' : sys.argv[1] == 'runserver' } # cf http://stackoverflow.com/a/4277798/319860
    except IndexError:
        return { 'LOCAL' : False }