sparse: add back sparse.py

Summary:
Some consumers still rely on enabling 'sparse=' so let's add a module
that just redirects to the real fbsparse.py.

Also updates configerator to use the newer name.

Reviewed By: markbt, quark-zju

Differential Revision: D6755971

fbshipit-source-id: 3a67f029045dacf927742a616a714fe632b97fea

hgext/sparse.py

@@ -0,0 +1,34 @@
+# sparse.py - shim that redirects to load fbsparse
+#
+# Copyright 2014 Facebook, Inc.
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+"""allow sparse checkouts of the working directory
+"""
+from __future__ import absolute_import
+
+from hgext import fbsparse
+
+cmdtable = fbsparse.cmdtable.copy()
+
+def _fbsparseexists(ui):
+    with ui.configoverride({("devel", "all-warnings"): False}):
+        return not ui.config('extensions', 'fbsparse', '!').startswith('!')
+
+def uisetup(ui):
+    if _fbsparseexists(ui):
+        cmdtable.clear()
+        return
+    fbsparse.uisetup(ui)
+
+def extsetup(ui):
+    if _fbsparseexists(ui):
+        cmdtable.clear()
+        return
+    fbsparse.extsetup(ui)
+
+def reposetup(ui, repo):
+    if _fbsparseexists(ui):
+        return
+    fbsparse.reposetup(ui, repo)

tests/test-check-config.t

@@ -45,6 +45,7 @@ New errors are not allowed. Warnings are strongly discouraged.
 
   $ testrepohg files "set:(**.py or **.txt) - tests/**" | sed 's|\\|/|g' |
   >   $PYTHON contrib/check-config.py
+  undocumented: extensions.fbsparse (str) ['!']
   undocumented: extensions.treemanifest (str)
   undocumented: fastlog.debug (str)
   undocumented: fastlog.enabled (bool)