--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext/evolution.py	Wed Sep 14 22:29:19 2011 +0200
@@ -0,0 +1,70 @@
+# states.py - introduce the state concept for mercurial changeset
+#
+# Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
+#                Logilab SA        <contact@logilab.fr>
+#                Pierre-Yves David <pierre-yves.david@ens-lyon.org>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+'''A set of command to make changeset evolve.'''
+
+from mercurial import cmdutil
+from mercurial import scmutil
+from mercurial import node
+from mercurial import error
+from mercurial import extensions
+from mercurial import commands
+from mercurial.i18n import _
+
+### util function
+#############################
+def noderange(repo, revsets):
+    """The same as revrange but return node"""
+    return map(repo.changelog.node,
+               scmutil.revrange(repo, revsets))
+
+### extension check
+#############################
+
+def extsetup(ui):
+    try:
+        rebase = extensions.find('obsolete')
+    except KeyError:
+        raise error.Abort(_('evolution extension require obsolete extension.'))
+
+### new command
+#############################
+cmdtable = {}
+command = cmdutil.command(cmdtable)
+
+@command('^kill',
+    [],
+    '<revs>')
+def kill(ui, repo, *revs):
+    """mark a changeset as obsolete
+
+    This update the parent directory to a not-killed parent if the current
+    working directory parent are killed.
+
+    XXX bookmark support
+    XXX handle merge
+    XXX check immutable first
+    """
+    wlock = repo.wlock()
+    try:
+        targetnodes = set(noderange(repo, revs))
+        for n in targetnodes:
+            repo.addobsolete(node.nullid, n)
+        # update to an unkilled parent
+        wdp = repo['.']
+        newnode = wdp
+        while newnode.obsolete():
+            newnode = newnode.parents()[0]
+        if newnode.node() != wdp.node():
+            commands.update(ui, repo, newnode.rev())
+            ui.status(_('working directory now at %s\n') % newnode)
+
+    finally:
+        wlock.release()
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-evolution.t	Wed Sep 14 22:29:19 2011 +0200
@@ -0,0 +1,61 @@
+  $ cat >> $HGRCPATH <<EOF
+  > [web]
+  > push_ssl = false
+  > allow_push = *
+  > [alias]
+  > qlog = log --template='{rev} - {node|short} {desc} ({state})\n'
+  > [extensions]
+  > EOF
+  $ echo "states=$(echo $(dirname $TESTDIR))/hgext/states.py" >> $HGRCPATH
+  $ echo "obsolete=$(echo $(dirname $TESTDIR))/hgext/obsolete.py" >> $HGRCPATH
+  $ echo "evolution=$(echo $(dirname $TESTDIR))/hgext/evolution.py" >> $HGRCPATH
+  $ mkcommit() {
+  >    echo "$1" > "$1"
+  >    hg add "$1"
+  >    hg ci -m "add $1"
+  > }
+
+various init
+
+  $ hg init local
+  $ cd local
+  $ hg states ready # XXX should be put in default config when state support it
+  $ mkcommit a
+  $ mkcommit b
+  $ mkcommit c
+  $ mkcommit d
+  $ hg up 1
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ mkcommit e -q
+  created new head
+  $ mkcommit f
+  $ hg published 1
+  $ hg qlog
+  5 - e44648563c73 add f (ready)
+  4 - fbb94e3a0ecf add e (ready)
+  3 - 47d2a3944de8 add d (ready)
+  2 - 4538525df7e2 add c (ready)
+  1 - 7c3bad9141dc add b (published)
+  0 - 1f0dee641bb7 add a (published)
+
+test simple kill
+
+  $ hg kill 5
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  working directory now at fbb94e3a0ecf
+  $ hg qlog
+  4 - fbb94e3a0ecf add e (ready)
+  3 - 47d2a3944de8 add d (ready)
+  2 - 4538525df7e2 add c (ready)
+  1 - 7c3bad9141dc add b (published)
+  0 - 1f0dee641bb7 add a (published)
+
+test multiple kill
+
+  $ hg kill 4 3
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  working directory now at 7c3bad9141dc
+  $ hg qlog
+  2 - 4538525df7e2 add c (ready)
+  1 - 7c3bad9141dc add b (published)
+  0 - 1f0dee641bb7 add a (published)