def text_at_revision(self, revision):
"""Returns the text as it was at the specified revision."""
if revision.article != self:
raise RelationshipMismatch()
d = diff_match_patch()
rewound = self.text
for r in self.revisions.filter(date__gte=revision.date):
rewound = d.patch_apply(d.patch_fromText(r.delta), rewound)[0]
return rewound
def revise_text(self, revised_text, reviser=None):
if reviser is None:
try:
reviser = self.authors_in_order().all()[0]
except IndexError:
# TODO: better error handling when there's no authors
reviser = None
d = diff_match_patch()
patch = d.patch_toText(d.patch_make(revised_text, self.text))
ArticleRevision.objects.create(article=self, delta=patch, reviser=reviser)
self.text = revised_text
self.save()
