comparison mercurial/context.py @ 19292:e0aa6fff8f02

annotate: simplify annotate parent function

The annotate algorithm used a custom parents() function to try to reuse
filectx and filelogs. I simplified it a bit to rely more heavily on the
self.parents() which makes it work well with alternative filectx
implementations. I tested performance on a file with 5000+ revisions
but no renames, and on a file with 500 revisions repeating a series of
4 edits+renames and saw zero performance hit.  In fact, it was reliably a
couple milliseconds faster now.

Added the perfannotate command to contrib/perf.py for future use.

19291:93635f69c93b

                if t == '=':
                    child[0][b1:b2] = parent[0][a1:a2]
            return child

        getlog = util.lrucachefunc(lambda x: self._repo.file(x))
        def getctx(path, fileid):
            log = path == self._path and self._filelog or getlog(path)
            return filectx(self._repo, path, fileid=fileid, filelog=log)
        getctx = util.lrucachefunc(getctx)

        def parents(f):
            # we want to reuse filectx objects as much as possible
            p = f._path
            if f._filerev is None: # working dir
                pl = [(n.path(), n.filerev()) for n in f.parents()]
            else:
                pl = [(p, n) for n in f._filelog.parentrevs(f._filerev)]

            if follow:
                r = f.renamed()
                if r:
                    pl[0] = (r[0], getlog(r[0]).rev(r[1]))

            return [getctx(p, n) for p, n in pl if n != nullrev]

        # use linkrev to find the first changeset where self appeared
        if self.rev() != self.linkrev():
            base = self.filectx(self.filerev())
        else:

19292:e0aa6fff8f02

                if t == '=':
                    child[0][b1:b2] = parent[0][a1:a2]
            return child

        getlog = util.lrucachefunc(lambda x: self._repo.file(x))

        def parents(f):
            pl = f.parents()

            # Don't return renamed parents if we aren't following.
            if not follow:
                pl = [p for p in pl if p.path() == f.path()]

            # renamed filectx won't have a filelog yet, so set it
            # from the cache to save time
            for p in pl:
                if not '_filelog' in p.__dict__:
                    p._filelog = getlog(p.path())

            return pl

        # use linkrev to find the first changeset where self appeared
        if self.rev() != self.linkrev():
            base = self.filectx(self.filerev())
        else: