846 @command('^fold',

   847     [('r', 'rev', [], 'revision to fold'),],

   848     # allow to choose the seed ?

   849     _('[-r] revs'))

   850 def fold(ui, repo, *revs, **opts):

   851     """Fold multiple revision into a single one"""

   852     revs = list(revs)

   853     revs.extend(opts['rev'])

   854     if not revs:

   855         revs = ['.']

   856     revs = scmutil.revrange(repo, revs)

   857     if not revs:

   858         ui.write_err('no revision to fold\n')

   859         return 1

   860     roots = repo.revs('roots(%ld)', revs)

   861     if len(roots) > 1:

   862         raise util.Abort("set have multiple roots")

   863     root = repo[roots[0]]

   864     if root.phase() <= phases.public:

   865         raise util.Abort("can't touch public revision")

   866     heads = repo.revs('heads(%ld)', revs)

   867     if len(heads) > 1:

   868         raise util.Abort("set have multiple heads")

   869     head = repo[heads[0]]

   870     obsolete = extensions.find('obsolete')

   871     wlock = repo.wlock()

   872     try:

   873         lock = repo.lock()

   874         try:

   875             tr = repo.transaction('touch')

   876             try:

   877                 allctx = [repo[r] for r in revs]

   878                 targetphase = max(c.phase() for c in allctx)

   879                 msg = '\n\n***\n\n'.join(c.description() for c in allctx)

   880                 newid, _ = rewrite(repo, root, allctx, head,

   881                                  [root.p1().node(), root.p2().node()],

   882                                  commitopts={'message': msg})

   883                 phases.retractboundary(repo, targetphase, [newid])

   884                 obsolete.createmarkers(repo, [(ctx, (repo[newid],))

   885                                                for ctx in allctx])

   886                 tr.close()

   887             finally:

   888                 tr.release()

   889         finally:

   890             lock.release()

   891         ui.status('%i changesets folded\n' % len(revs))

   892         if repo.revs('. and %ld', revs):

   893             repo.dirstate.setparents(newid, node.nullid)

   894     finally:

   895         wlock.release()

   896