comparison mercurial/revlog.py @ 38636:25534e0cf0d9

revlog: _segmentspan computes the byte span of a segment

Refactor out this code to be used somewhere else in a next changeset

38635:d083ae26c325

    while endidx > 1 and endidx > startidx and length(revs[endidx - 1]) == 0:
        endidx -= 1

    return revs[startidx:endidx]

def _slicechunk(revlog, revs):
    """slice revs to reduce the amount of unrelated data to be read from disk.

    ``revs`` is sliced into groups that should be read in one time.
    Assume that revs are sorted.

    if len(revs) <= 1:
        yield revs
        return

    startbyte = start(revs[0])
    endbyte = start(revs[-1]) + length(revs[-1])
    readdata = deltachainspan = endbyte - startbyte

    if deltachainspan < revlog._srmingapsize:
        yield revs
        return

38636:25534e0cf0d9

    while endidx > 1 and endidx > startidx and length(revs[endidx - 1]) == 0:
        endidx -= 1

    return revs[startidx:endidx]

def _segmentspan(revlog, revs):
    """Get the byte span of a segment of revisions

    revs is a sorted array of revision numbers
    """
    if not revs:
        return 0
    return revlog.end(revs[-1]) - revlog.start(revs[0])

def _slicechunk(revlog, revs):
    """slice revs to reduce the amount of unrelated data to be read from disk.

    ``revs`` is sliced into groups that should be read in one time.
    Assume that revs are sorted.

    if len(revs) <= 1:
        yield revs
        return

    readdata = deltachainspan = _segmentspan(revlog, revs)

    if deltachainspan < revlog._srmingapsize:
        yield revs
        return