1 from mercurial import revset

     2 from mercurial import error

     3 def ngtip(repo, branch, all=False):

     4     """tip new generation"""

     5     ## search for untopiced heads of branch

     6     # could be heads((::branch(x) - topic()))

     7     # but that is expensive

     8     #

     9     # we should write plain code instead

    10     subquery = '''heads(

    11                     parents(

    12                        ancestor(

    13                          (head() and branch(%s)

    14                          or (topic() and branch(%s)))))

    15                    ::(head() and branch(%s))

    16                    - topic())'''

    17     if not all:

    18         subquery = 'max(%s)' % subquery

    19     return repo.revs(subquery, branch, branch, branch)