# $Hg$

import kwexpander

from mercurial import cmdutil, commands

import sys

def pretxnkw(ui, repo, hooktype, **args):

    '''Important: returns False on success, True on failure.'''

    if hooktype != 'pretxncommit':

        # bail out with error

        return True

    # reparse args, opts again as pretxncommit hook is silent about them

    sysargs, globalopts, cmdopts = commands.parse(ui, sys.argv[1:])[2:]

    files, match, anypats = cmdutil.matchpats(repo, sysargs, cmdopts)

    # validity checks should have been done already

    modified, added = repo.status(files=files, match=match)[:2]

    candidates = modified + added

    if candidates:

        r = repo.changelog.tip()

        n = args['node'][:12]

        # TODO: check whether we need parent1&2 like in updatekw

        return kwexpander.expandkw(ui, repo, r, n, candidates, update=False)