from node import hex

import encoding

def write(repo, branches, tip, tiprev):

    try:

        f = repo.opener("cache/branchheads", "w", atomictemp=True)

        f.write("%s %s\n" % (hex(tip), tiprev))

        for label, nodes in branches.iteritems():

            for node in nodes:

                f.write("%s %s\n" % (hex(node), encoding.fromlocal(label)))

        f.close()

    except (IOError, OSError):

        pass