--- a/hgext3rd/evolve/__init__.py	Thu May 18 17:40:07 2017 +0200
+++ b/hgext3rd/evolve/__init__.py	Thu May 18 18:04:47 2017 +0200
@@ -190,6 +190,7 @@
 eh.merge(checkheads.eh)
 eh.merge(safeguard.eh)
 eh.merge(obscache.eh)
+eh.merge(obshistory.eh)
 uisetup = eh.final_uisetup
 extsetup = eh.final_extsetup
 reposetup = eh.final_reposetup
@@ -3261,48 +3262,3 @@
                 f.write(orig.topic())
 
     return merge.graft(repo, orig, pctx, ['local', 'graft'], True)
-
-@eh.command(
-    '^debugobshistory',
-    [('G', 'graph', True, _("show the revision DAG")),
-     ('r', 'rev', [], _('show the specified revision or revset'), _('REV'))
-    ] + commands.formatteropts,
-    _('hg debugobshistory [OPTION]... [REV]'))
-def cmdobshistory(ui, repo, *revs, **opts):
-    """show the obsolescence history of the specified revisions.
-
-    By default this command prints the selected revisions and all its
-    precursors. For precursors pointing on existing revisions in the repository,
-    it will display revisions node id, revision number and the first line of the
-    description. For precursors pointing on non existing revisions in the
-    repository (that can happen when exchanging obsolescence-markers), display
-    only the node id.
-
-    In both case, for each node, its obsolescence marker will be displayed with
-    the obsolescence operation (rewritten or pruned) in addition of the user and
-    date of the operation.
-
-    The output is a graph by default but can deactivated with the option '--no-
-    graph'.
-
-    'o' is a changeset, '@' is a working directory parent, 'x' is obsolete,
-    and '+' represents a fork where the changeset from the lines below is a
-    parent of the 'o' merge on the same line.
-
-    Paths in the DAG are represented with '|', '/' and so forth.
-
-    Returns 0 on success.
-    """
-    revs = list(revs) + opts['rev']
-    if not revs:
-        revs = ['.']
-    revs = scmutil.revrange(repo, revs)
-
-    if opts['graph']:
-        return obshistory._debugobshistorygraph(ui, repo, revs, opts)
-
-    fm = ui.formatter('debugobshistory', opts)
-    revs.reverse()
-    obshistory._debugobshistorysingle(fm, repo, revs)
-
-    fm.end()

--- a/hgext3rd/evolve/obshistory.py	Thu May 18 17:40:07 2017 +0200
+++ b/hgext3rd/evolve/obshistory.py	Thu May 18 18:04:47 2017 +0200
@@ -8,12 +8,67 @@
 # GNU General Public License version 2 or any later version.
 
 from mercurial import (
-    node as nodemod,
     cmdutil,
+    commands,
+    error,
     graphmod,
-    error
+    node as nodemod,
+    scmutil,
+)
+
+from mercurial.i18n import _
+
+from . import (
+    exthelper,
 )
 
+eh = exthelper.exthelper()
+
+@eh.command(
+    '^debugobshistory',
+    [('G', 'graph', True, _("show the revision DAG")),
+     ('r', 'rev', [], _('show the specified revision or revset'), _('REV'))
+    ] + commands.formatteropts,
+    _('hg debugobshistory [OPTION]... [REV]'))
+def cmdobshistory(ui, repo, *revs, **opts):
+    """show the obsolescence history of the specified revisions.
+
+    By default this command prints the selected revisions and all its
+    precursors. For precursors pointing on existing revisions in the repository,
+    it will display revisions node id, revision number and the first line of the
+    description. For precursors pointing on non existing revisions in the
+    repository (that can happen when exchanging obsolescence-markers), display
+    only the node id.
+
+    In both case, for each node, its obsolescence marker will be displayed with
+    the obsolescence operation (rewritten or pruned) in addition of the user and
+    date of the operation.
+
+    The output is a graph by default but can deactivated with the option '--no-
+    graph'.
+
+    'o' is a changeset, '@' is a working directory parent, 'x' is obsolete,
+    and '+' represents a fork where the changeset from the lines below is a
+    parent of the 'o' merge on the same line.
+
+    Paths in the DAG are represented with '|', '/' and so forth.
+
+    Returns 0 on success.
+    """
+    revs = list(revs) + opts['rev']
+    if not revs:
+        revs = ['.']
+    revs = scmutil.revrange(repo, revs)
+
+    if opts['graph']:
+        return _debugobshistorygraph(ui, repo, revs, opts)
+
+    fm = ui.formatter('debugobshistory', opts)
+    revs.reverse()
+    _debugobshistorysingle(fm, repo, revs)
+
+    fm.end()
+
 class obsmarker_printer(cmdutil.changeset_printer):
     """show (available) information about a node