perf: import newer modules separately for earlier Mercurial demandimport of early Mercurial loads an imported module immediately, if a module is imported absolutely by "from a import b" style. Recent perf.py satisfies this condition, because it does: - have "from __future__ import absolute_import" line - use "from a import b" style for modules in "mercurial" package Before this patch, importing modules below prevents perf.py from being loaded by earlier Mercurial, because these aren't available in such Mercurial, even though there are some code paths for Mercurial earlier than 1.9. - branchmap 2.5 (or bcee63733aad) - repoview 2.5 (or 3a6ddacb7198) - obsolete 2.3 (or ad0d6c2b3279) - scmutil 1.9 (or 8b252e826c68) For example, setting "_prereadsize" attribute in perfindex() and perfnodelookup() is effective only with Mercurial earlier than 1.8 (or 61c9bc3da402). After this patch, "mercurial.error" is the only blocker in "from mercurial import" statement for loading perf.py with Mercurial earlier than 1.2. This patch ignores it, because just importing it separately isn't enough.

--- a/contrib/perf.py	Wed Jul 13 23:38:29 2016 +0530
+++ b/contrib/perf.py	Fri May 20 09:47:35 2016 +0900
@@ -25,7 +25,6 @@
 import sys
 import time
 from mercurial import (
-    branchmap,
     cmdutil,
     commands,
     copies,
@@ -33,14 +32,31 @@
     extensions,
     mdiff,
     merge,
-    obsolete,
-    repoview,
     revlog,
-    scmutil,
     util,
 )
 
 # for "historical portability":
+# try to import modules separately (in dict order), and ignore
+# failure, because these aren't available with early Mercurial
+try:
+    from mercurial import branchmap # since 2.5 (or bcee63733aad)
+except ImportError:
+    pass
+try:
+    from mercurial import obsolete # since 2.3 (or ad0d6c2b3279)
+except ImportError:
+    pass
+try:
+    from mercurial import repoview # since 2.5 (or 3a6ddacb7198)
+except ImportError:
+    pass
+try:
+    from mercurial import scmutil # since 1.9 (or 8b252e826c68)
+except ImportError:
+    pass
+
+# for "historical portability":
 # define util.safehasattr forcibly, because util.safehasattr has been
 # available since 1.9.3 (or 94b200a11cf7)
 _undefined = object()