comparison mercurial/context.py @ 27063:37e1fdcb271c

context: optimize _parents()

This patch avoids some extra attribute lookups and list mutations.

This micro-optimization seems to result in a minor speedup for `hg log`
on my Firefox repo:

before: 25.35s
after:  24.91s
delta:  -0.44s (98% of original)

Not the biggest gain. But every little bit helps.

27062:e4f2e4f5e98d

    def _manifestdelta(self):
        return self._repo.manifest.readdelta(self._changeset[0])

    @propertycache
    def _parents(self):
        p = self._repo.changelog.parentrevs(self._rev)
        if p[1] == nullrev:
            p = p[:-1]
        return [changectx(self._repo, x) for x in p]

    def changeset(self):
        return self._changeset
    def manifestnode(self):
        return self._changeset[0]

27063:37e1fdcb271c

    def _manifestdelta(self):
        return self._repo.manifest.readdelta(self._changeset[0])

    @propertycache
    def _parents(self):
        repo = self._repo
        p1, p2 = repo.changelog.parentrevs(self._rev)
        if p2 == nullrev:
            return [changectx(repo, p1)]
        return [changectx(repo, p1), changectx(repo, p2)]

    def changeset(self):
        return self._changeset
    def manifestnode(self):
        return self._changeset[0]