for group in self.groups:
				initial = set()
				for perm in FolderPermission.objects.filter(folder=folder, group=group):
					[initial.add(p.codename) for p in perm.permissions.all()]

				self.fields["group%s" % group.id] = forms.MultipleChoiceField(choices=[(p.codename, p.name) for p in Permission.objects.filter(content_type__app_label="zephyros", content_type__name="folder")], initial=initial, label=group.name, widget=forms.CheckboxSelectMultiple)

def get_eligible_groups(user):
	if user.is_superuser:
		return Group.objects.all()
	else:
		return user.groups.all()

def FolderPermissionForm(user, folder):
	class Form(DialogForm):
		def __init__(self, *args, **kwargs):
			super(Form, self).__init__(*args, **kwargs)

			self.instance = folder

			self.dialog["title"] = "Edit folder %s permissions" % folder.name
			self.dialog["id"] = "%s-changeperm" % folder.slug
			self.dialog["form_id"] = "folder-changeperm"

			self.groups = get_eligible_groups(user)

			for group in self.groups:
				initial = set()
				for perm in FolderPermission.objects.filter(folder=folder, group=group):
					[initial.add(p.codename) for p in perm.permissions.all()]

				self.fields["group%s" % group.id] = forms.MultipleChoiceField(choices=[(p.codename, p.name) for p in Permission.objects.filter(content_type__app_label="zephyros", content_type__name="folder")], initial=initial, label=group.name, widget=forms.CheckboxSelectMultiple, required=False)

		def save(self):
			for group in self.groups:
				cur = self.cleaned_data.get("group%s" % group.id, False)

				if not cur:
					continue # Silently ignore this, the group was added to the user between form request and submission

				# Seperate existing permissions
				gps = FolderPermission.objects.filter(folder=self.instance, group=group)
				for gp in gps:
					gp.folder.remove(self.instance)
				
				gp = FolderPermission(group=group)
				gp.save()

				gp.folder.add(self.instance.id)

				for cn in cur:
					gp.permissions.add(Permission.objects.get(content_type__app_label="zephyros", content_type__name="folder", codename=cn).id)

				gp.save()
	return Form