from mercurial.i18n import _

from mercurial import cmdutil, util

def checksubstate(repo, baserev=None):

    '''return list of subrepos at a different revision than substate.

    Abort if any subrepos have uncommitted changes.'''

    inclsubs = []

    wctx = repo[None]

    if baserev:

        bctx = repo[baserev]

    else:

        bctx = wctx.parents()[0]

    for s in sorted(wctx.substate):

        if wctx.sub(s).dirty(True):

            raise util.Abort(

                _("uncommitted changes in subrepository %s") % s)

        elif s not in bctx.substate or bctx.sub(s).dirty():

            inclsubs.append(s)

    return inclsubs