view hgext/purge.py @ 14087:f3d585c9b042

graphmod: restore generator nature of dagwalker

9966c95b8c4f introduced the ability to walk the DAG
given arbitrary revisions, but changed the behaviour of
it to return a list of all nodes (and create a changectx
for each one) rather than doing it lazily.

This has a pretty significant impact on performance for large
repositories (tested on CPython repo, with output disabled):

  $ time hg glog

  real	0m2.642s
  user	0m2.560s
  sys	0m0.080s

Before 9966c95b8c4f:

  $ time hg glog

  real	0m0.143s
  user	0m0.112s
  sys	0m0.032s

And after this fix:

  $ time hg glog

  real	0m0.213s
  user	0m0.184s
  sys	0m0.028s

# Copyright (C) 2006 - Marco Barisione <[e-mail]>
#
# This is a small extension for Mercurial (http://mercurial.selenic.com/)
# that removes files not known to mercurial
#
# This program was inspired by the "cvspurge" script contained in CVS
# utilities (http://www.red-bean.com/cvsutils/).
#
# For help on the usage of "hg purge" use:
#  hg help purge
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

'''command to delete untracked files from the working directory'''

from mercurial import util, commands, cmdutil
from mercurial.i18n import _
import os, stat

def purge(ui, repo, *dirs, **opts):
    '''removes files not tracked by Mercurial

    Delete files not known to Mercurial. This is useful to test local
    and uncommitted changes in an otherwise-clean source tree.

    This means that purge will delete:

    - Unknown files: files marked with "?" by :hg:`status`
    - Empty directories: in fact Mercurial ignores directories unless
      they contain files under source control management

    But it will leave untouched:

    - Modified and unmodified tracked files
    - Ignored files (unless --all is specified)
    - New files added to the repository (with :hg:`add`)

    If directories are given on the command line, only files in these
    directories are considered.

    Be careful with purge, as you could irreversibly delete some files
    you forgot to add to the repository. If you only want to print the
    list of files that this program would delete, use the --print
    option.
    '''
    act = not opts['print']
    eol = '\n'
    if opts['print0']:
        eol = '\0'
        act = False # --print0 implies --print

    def remove(remove_func, name):
        if act:
            try:
                remove_func(repo.wjoin(name))
            except OSError:
                m = _('%s cannot be removed') % name
                if opts['abort_on_err']:
                    raise util.Abort(m)
                ui.warn(_('warning: %s\n') % m)
        else:
            ui.write('%s%s' % (name, eol))

    def removefile(path):
        try:
            os.remove(path)
        except OSError:
            # read-only files cannot be unlinked under Windows
            s = os.stat(path)
            if (s.st_mode & stat.S_IWRITE) != 0:
                raise
            os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE)
            os.remove(path)

    directories = []
    match = cmdutil.match(repo, dirs, opts)
    match.dir = directories.append
    status = repo.status(match=match, ignored=opts['all'], unknown=True)

    for f in sorted(status[4] + status[5]):
        ui.note(_('Removing file %s\n') % f)
        remove(removefile, f)

    for f in sorted(directories, reverse=True):
        if match(f) and not os.listdir(repo.wjoin(f)):
            ui.note(_('Removing directory %s\n') % f)
            remove(os.rmdir, f)

cmdtable = {
    'purge|clean':
        (purge,
         [('a', 'abort-on-err', None, _('abort if an error occurs')),
          ('',  'all', None, _('purge ignored files too')),
          ('p', 'print', None, _('print filenames instead of deleting them')),
          ('0', 'print0', None, _('end filenames with NUL, for use with xargs'
                                  ' (implies -p/--print)')),
         ] + commands.walkopts,
         _('hg purge [OPTION]... [DIR]...'))
}