lemoncurry/entries/pagination.py

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from typing import Callable
from django.core.paginator import Page, Paginator
from django.shortcuts import redirect
from lemoncurry.middleware import ResponseException
def paginate(queryset, reverse: Callable[[int], str], page: int | None) -> Page:
def redirect_to_page(i: int):
raise ResponseException(redirect(reverse(i)))
def reversible(p: Page) -> Page:
p.reverse = reverse
return p
paginator = Paginator(queryset, 10)
# If no page number was specified, return page one.
if page is None:
return reversible(paginator.page(1))
# If the first page was explicitly requested, or the page number was negative, redirect to page one with no URL suffix.
if page <= 1:
redirect_to_page(1)
# If the page requested is larger than the last page, then redirect to the last page.
if page > paginator.num_pages:
redirect_to_page(paginator.num_pages)
# Just return the current page! Hooray!
return reversible(paginator.page(page))