Update hg version to 4.2.1. Fixes bug 1374644.

Make hg extension compatible with hg 4.2.1. Follow the (weird, pathologically introspective, scribbly-on-globals) idiom from https://www.mercurial-scm.org/wiki/WritingExtensions#Command_table. The @command decorator fills in the attrs of the function that hg is expecting and throwing AttributeErrors over.

Update hglib while we're at it.

dxr/hgext/previous_revisions.py

@@ -18,6 +18,14 @@
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 
+from mercurial import cmdutil
+
+
+cmdtable = {}
+command = cmdutil.command(cmdtable)
+
+
+@command('previous-revisions', [])
 def previous_revisions(ui, repo, **opts):
     """Print the last node@date@file in which each file changed."""
     last_change = {}
@@ -30,8 +38,6 @@ def previous_revisions(ui, repo, **opts):
     for filename, (node, date) in last_change.iteritems():
         ui.write('%s@%s@%s\n' % (node, date, filename))
 
-cmdtable = {
-    'previous-revisions': (previous_revisions, [], '')
-}
 
-testedwith = '3.4'
+testedwith = '4.2.1'
+minimumhgversion = '1.9'  # not tested with 1.9, but this is where @command was introduced

requirements.txt

@@ -36,8 +36,8 @@ Jinja2==2.7.3
 # sha256: pOwa_1m5WhS0XrLiN2GgF56YMZ2lp-t2tW6ozce4ccM
 MarkupSafe==0.23
 
-# sha256: 3MkOSoR2FJ7MivE8CCAoYLTJyYepTE88GLKClLb9js0
-Mercurial==3.4.2
+# sha256: 19VXL1qgeX-_IWhEDqpRFJ34hkX-N6-LFfpmDZqBWKA
+Mercurial==4.2.1
 
 # sha256: k-YuBcetPaGiM972cx6ChRVnAeNBml_ieQF8Qp7GfOA
 more-itertools==2.2
@@ -89,5 +89,5 @@ xpidl==1.0
 # sha256: FWvz7Ce6nsfgz4--AoCHGAmdIY3kA-tkpxTXO6GimrE
 requests==1.2.3
 
-# sha256: DcCH0Vt3TNqC08gJb7DlFMrrLdtg7tOOkFaxbiebo8U
-python-hglib==1.7
+# sha256: aT1u2SplZueIAsegPCVs2jPQjGOtPwD8-hE3mxhLlGI
+python-hglib==2.4