hgext/children.py

convert: support incremental conversion with hg subrepos

This was implied in issue3486, which specifically asked for subrepo support in
lfconvert.  Now that lfconvert uses the convert extension internally when going
to normal files, the issue is half fixed.  But now even non largefile repos
benefit when other transformations are needed.

Supporting a full subrepo tree conversion from a single command doesn't seem
reasonable, given the number of options that can be provided, and the
transformations that would need to occur when entering a subrepo (consider
'filemap' paths).  Instead, this allows the user to incrementally convert each
hg subrepo from bottom up like so:

  # so convert knows the dest type when it sees a non empty dest dir
  $ hg init converted

  $ hg convert orig/sub1 converted/sub1
  $ hg convert orig/sub2 converted/sub2
  $ hg convert orig converted

This allows different options to be applied to different subrepos more readily.
It assumes the shamap is in the default location in each converted subrepo for
simplicity.  It also allows for a subrepo to be cloned into place, in case _it_
doesn't need a conversion.  I was able to convert away from using
largefiles/bfiles in several subrepos with this mechanism.

# 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 or any later version.

'''command to display child changesets (DEPRECATED)

This extension is deprecated. You should use :hg:`log -r
"children(REV)"` instead.
'''

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

cmdtable = {}
command = cmdutil.command(cmdtable)
# Note for extension authors: ONLY specify testedwith = 'internal' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'internal'

@command('children',
    [('r', 'rev', '',
     _('show children of the specified revision'), _('REV')),
    ] + templateopts,
    _('hg children [-r REV] [FILE]'),
    inferrepo=True)
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_:
        fctx = repo.filectx(file_, changeid=rev)
        childctxs = [fcctx.changectx() for fcctx in fctx.children()]
    else:
        ctx = repo[rev]
        childctxs = ctx.children()

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