hgext/children.py

Make test-verify SUSv3 compatible.

'head -c' isn't supported on (at least) OpenBSD and is not
part of SUSv3. Instead, use dd.

See also:

    http://www.opengroup.org/onlinepubs/009695399/utilities/head.html

# Mercurial extension to provide the 'hg children' command
#
# Copyright 2007 by Intevation GmbH <[e-mail]>
#
# Author(s):
# Thomas Arendsen Hein <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

from mercurial import cmdutil
from mercurial.commands import templateopts
from mercurial.i18n import _


def children(ui, repo, file_=None, **opts):
    """show the children of the given or working directory revision

    Print the children of the working directory's revisions. If a
    revision is given via -r/--rev, the children of that revision will
    be printed. If a file argument is given, revision in which the
    file was last changed (after the working directory revision or the
    argument to --rev if given) is printed.
    """
    rev = opts.get('rev')
    if file_:
        ctx = repo.filectx(file_, changeid=rev)
    else:
        ctx = repo[rev]

    displayer = cmdutil.show_changeset(ui, repo, opts)
    for cctx in ctx.children():
        displayer.show(cctx)


cmdtable = {
    "children":
        (children,
         [('r', 'rev', '', _('show children of the specified revision')),
         ] + templateopts,
         _('hg children [-r REV] [FILE]')),
}