#

# Copyright 2010 Nicolas Dumazet

# Copyright 2013 Facebook, Inc.

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import errno

    pycompat,

)

    def rotate(oldpath, newpath):

        try:

            vfs.unlink(newpath)

        except OSError as err:

            if err.errno != errno.ENOENT:

                ui.debug("warning: cannot remove '%s': %s\n" %

                         (newpath, err.strerror))

        try:

            if newpath:

                vfs.rename(oldpath, newpath)

        except OSError as err:

            if err.errno != errno.ENOENT:

                ui.debug("warning: cannot rename '%s' to '%s': %s\n" %

                         (newpath, oldpath, err.strerror))

    if maxsize > 0:

        try:

            st = vfs.stat(name)

        except OSError:

            pass

        else:

            if st.st_size >= maxsize:

                path = vfs.join(name)

                for i in pycompat.xrange(maxfiles - 1, 1, -1):

                    rotate(oldpath='%s.%d' % (path, i - 1),

                           newpath='%s.%d' % (path, i))

                rotate(oldpath=path,

                       newpath=maxfiles > 0 and path + '.1')

    return vfs(name, 'a', makeparentdirs=False)

class proxylogger(object):

    """Forward log events to another logger to be set later"""

    def __init__(self):

        self.logger = None

    def tracked(self, event):

        return self.logger is not None and self.logger.tracked(event)

    def log(self, ui, event, msg, opts):

        assert self.logger is not None

        self.logger.log(ui, event, msg, opts)