comparison hgext3rd/topic/evolvebits.py @ 3017:0884856a4143 stable

stack: handle basic case of splitting with crash

hg stack used to crash horribly whenever a split was encountered. This is no
longer the case.

If the result of the split (or there successors) produce a sensible linear
result with on final head, we can just assume that head is the evolution
destination.

3012:081070828703

        ui.debug("stabilize target %s is plain dead,"
                 " trying to stabilize on its parent\n" %
                 obs)
        obs = obs.parents()[0]
        newer = compat.successorssets(repo, obs.node())
    if len(newer) > 1 or len(newer[0]) > 1:
        raise MultipleSuccessorsError(newer)

    return repo[newer[0][0]].rev()

class MultipleSuccessorsError(RuntimeError):
    """Exception raised by _singlesuccessor when multiple successor sets exists

3017:0884856a4143

        ui.debug("stabilize target %s is plain dead,"
                 " trying to stabilize on its parent\n" %
                 obs)
        obs = obs.parents()[0]
        newer = compat.successorssets(repo, obs.node())
    if 1 < len(newer):
        # divergence case
        # we should pick as arbitrary one
        raise MultipleSuccessorsError(newer)
    elif 1 < len(newer[0]):
        splitheads = list(repo.revs('heads(%ln::%ln)', newer[0], newer[0]))
        if 1 < len(splitheads):
            # split case, See if we can make sense of it.
            raise MultipleSuccessorsError(newer)
        return splitheads[0]

    return repo[newer[0][0]].rev()

class MultipleSuccessorsError(RuntimeError):
    """Exception raised by _singlesuccessor when multiple successor sets exists