diff -r 5c86af0da91d -r ec04eb4d2c6e hgext/drophack.py
--- a/hgext/drophack.py	Tue Feb 28 17:08:14 2017 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,163 +0,0 @@
-# This software may be used and distributed according to the terms of the
-# GNU General Public License version 2 or any later version.
-'''This extension add a hacky command to drop changeset during review
-
-This extension is intended as a temporary hack to allow Matt Mackall to use
-evolve in the Mercurial review it self. You should probably not use it if your
-name is not Matt Mackall.
-'''
-
-import os
-import time
-import contextlib
-
-from mercurial.i18n import _
-from mercurial import cmdutil
-from mercurial import repair
-from mercurial import scmutil
-from mercurial import lock as lockmod
-from mercurial import util
-from mercurial import commands
-
-cmdtable = {}
-command = cmdutil.command(cmdtable)
-
-
-@contextlib.contextmanager
-def timed(ui, caption):
-    ostart = os.times()
-    cstart = time.time()
-    yield
-    cstop = time.time()
-    ostop = os.times()
-    wall = cstop - cstart
-    user = ostop[0] - ostart[0]
-    sys  = ostop[1] - ostart[1]
-    comb = user + sys
-    ui.write("%s: wall %f comb %f user %f sys %f\n"
-             % (caption, wall, comb, user, sys))
-
-def obsmarkerchainfrom(obsstore, nodes):
-    """return all marker chain starting from node
-
-    Starting from mean "use as successors"."""
-    # XXX need something smarter for descendant of bumped changeset
-    seennodes = set(nodes)
-    seenmarkers = set()
-    pendingnodes = set(nodes)
-    precursorsmarkers = obsstore.precursors
-    while pendingnodes:
-        current = pendingnodes.pop()
-        new = set()
-        for precmark in precursorsmarkers.get(current, ()):
-            if precmark in seenmarkers:
-                continue
-            seenmarkers.add(precmark)
-            new.add(precmark[0])
-            yield precmark
-        new -= seennodes
-        pendingnodes |= new
-
-def stripmarker(ui, repo, markers):
-    """remove <markers> from the repo obsstore
-
-    The old obsstore content is saved in a `obsstore.prestrip` file
-    """
-    repo = repo.unfiltered()
-    repo.destroying()
-    oldmarkers = list(repo.obsstore._all)
-    util.rename(repo.sjoin('obsstore'),
-                repo.join('obsstore.prestrip'))
-    del repo.obsstore # drop the cache
-    newstore = repo.obsstore
-    assert not newstore # should be empty after rename
-    newmarkers = [m for m in oldmarkers if m not in markers]
-    tr = repo.transaction('drophack')
-    try:
-        newstore.add(tr, newmarkers)
-        tr.close()
-    finally:
-        tr.release()
-    repo.destroyed()
-
-
-@command('drop', [('r', 'rev', [], 'revision to update')], _('[-r] revs'))
-def cmddrop(ui, repo, *revs, **opts):
-    """I'm hacky do not use me!
-
-    This command strip a changeset, its precursors and all obsolescence marker
-    associated to its chain.
-
-    There is no way to limit the extend of the purge yet. You may have to
-    repull from other source to get some changeset and obsolescence marker
-    back.
-
-    This intended for Matt Mackall usage only. do not use me.
-    """
-    revs = list(revs)
-    revs.extend(opts['rev'])
-    if not revs:
-        revs = ['.']
-    # get the changeset
-    revs = scmutil.revrange(repo, revs)
-    if not revs:
-        ui.write_err('no revision to drop\n')
-        return 1
-    # lock from the beginning to prevent race
-    wlock = lock = None
-    try:
-        wlock = repo.wlock()
-        lock = repo.lock()
-        # check they have no children
-        if repo.revs('%ld and public()', revs):
-            ui.write_err('cannot drop public revision')
-            return 1
-        if repo.revs('children(%ld) - %ld', revs, revs):
-            ui.write_err('cannot drop revision with children')
-            return 1
-        if repo.revs('. and %ld', revs):
-            newrevs = repo.revs('max(::. - %ld)', revs)
-            if newrevs:
-                assert len(newrevs) == 1
-                newrev = newrevs.first()
-            else:
-                newrev = -1
-            commands.update(ui, repo, newrev)
-            ui.status(_('working directory now at %s\n') % repo[newrev])
-        # get all markers and successors up to root
-        nodes = [repo[r].node() for r in revs]
-        with timed(ui, 'search obsmarker'):
-            markers = set(obsmarkerchainfrom(repo.obsstore, nodes))
-        ui.write('%i obsmarkers found\n' % len(markers))
-        cl = repo.unfiltered().changelog
-        with timed(ui, 'search nodes'):
-            allnodes = set(nodes)
-            allnodes.update(m[0] for m in markers if cl.hasnode(m[0]))
-        ui.write('%i nodes found\n' % len(allnodes))
-        cl = repo.changelog
-        visiblenodes = set(n for n in allnodes if cl.hasnode(n))
-        # check constraint again
-        if repo.revs('%ln and public()', visiblenodes):
-            ui.write_err('cannot drop public revision')
-            return 1
-        if repo.revs('children(%ln) - %ln', visiblenodes, visiblenodes):
-            ui.write_err('cannot drop revision with children')
-            return 1
-
-        if markers:
-            # strip them
-            with timed(ui, 'strip obsmarker'):
-                stripmarker(ui, repo, markers)
-        # strip the changeset
-        with timed(ui, 'strip nodes'):
-            repair.strip(ui, repo, list(allnodes), backup="all",
-                         topic='drophack')
-
-    finally:
-        lockmod.release(lock, wlock)
-
-    # rewrite the whole file.
-    # print data.
-    # - time to compute the chain
-    # - time to strip the changeset
-    # - time to strip the obs marker.