--- a/hgext/purge.py	Mon Jan 18 10:24:11 2021 +0100
+++ b/hgext/purge.py	Mon Jan 18 10:24:20 2021 +0100
@@ -22,118 +22,11 @@
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, see <http://www.gnu.org/licenses/>.
 
-'''command to delete untracked files from the working directory'''
-from __future__ import absolute_import
-
-from mercurial.i18n import _
-from mercurial import (
-    cmdutil,
-    merge as mergemod,
-    pycompat,
-    registrar,
-    scmutil,
-)
-
-cmdtable = {}
-command = registrar.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' 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 = b'ships-with-hg-core'
-
-
-@command(
-    b'purge|clean',
-    [
-        (b'a', b'abort-on-err', None, _(b'abort if an error occurs')),
-        (b'', b'all', None, _(b'purge ignored files too')),
-        (b'i', b'ignored', None, _(b'purge only ignored files')),
-        (b'', b'dirs', None, _(b'purge empty directories')),
-        (b'', b'files', None, _(b'purge files')),
-        (b'p', b'print', None, _(b'print filenames instead of deleting them')),
-        (
-            b'0',
-            b'print0',
-            None,
-            _(
-                b'end filenames with NUL, for use with xargs'
-                b' (implies -p/--print)'
-            ),
-        ),
-        (b'', b'confirm', None, _(b'ask before permanently deleting files')),
-    ]
-    + cmdutil.walkopts,
-    _(b'hg purge [OPTION]... [DIR]...'),
-    helpcategory=command.CATEGORY_WORKING_DIRECTORY,
-)
-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 the following by default:
-
-    - Unknown files: files marked with "?" by :hg:`status`
-    - Empty directories: in fact Mercurial ignores directories unless
-      they contain files under source control management
+'''command to delete untracked files from the working directory (DEPRECATED)
 
-    But it will leave untouched:
-
-    - Modified and unmodified tracked files
-    - Ignored files (unless -i or --all is specified)
-    - New files added to the repository (with :hg:`add`)
-
-    The --files and --dirs options can be used to direct purge to delete
-    only files, only directories, or both. If neither option is given,
-    both will be deleted.
-
-    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.
-    """
-    opts = pycompat.byteskwargs(opts)
-    cmdutil.check_at_most_one_arg(opts, b'all', b'ignored')
+The functionality of this extension has been included in core Mercurial since
+version 5.7. Please use :hg:`purge ...` instead. :hg:`purge --confirm` is now the default, unless the extension is enabled for backward compatibility.
+'''
 
-    act = not opts.get(b'print')
-    eol = b'\n'
-    if opts.get(b'print0'):
-        eol = b'\0'
-        act = False  # --print0 implies --print
-    if opts.get(b'all', False):
-        ignored = True
-        unknown = True
-    else:
-        ignored = opts.get(b'ignored', False)
-        unknown = not ignored
-
-    removefiles = opts.get(b'files')
-    removedirs = opts.get(b'dirs')
-    confirm = opts.get(b'confirm')
-
-    if not removefiles and not removedirs:
-        removefiles = True
-        removedirs = True
-
-    match = scmutil.match(repo[None], dirs, opts)
-
-    paths = mergemod.purge(
-        repo,
-        match,
-        unknown=unknown,
-        ignored=ignored,
-        removeemptydirs=removedirs,
-        removefiles=removefiles,
-        abortonerror=opts.get(b'abort_on_err'),
-        noop=not act,
-        confirm=confirm,
-    )
-
-    for path in paths:
-        if not act:
-            ui.write(b'%s%s' % (path, eol))
+# This empty extension looks pointless, but core mercurial checks if it's loaded
+# to implement the slightly different behavior documented above.