[PATCH 4 of 4] revrange: build spanset from x:y range

Yuya Nishihara yuya at tcha.org
Mon Jun 1 10:21:07 CDT 2015


# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1432459827 -32400
#      Sun May 24 18:30:27 2015 +0900
# Node ID 1ef9e73a53e0de38faf654fbe204812df4f194b0
# Parent  61d50109a9e85bcd4e23954f2eebe6d513aa04e3
revrange: build spanset from x:y range

This slightly improves the performance in the optimal case:

% hg log -R mozilla-central -r0:tip -l1 --time
(before)
time: real 0.050 secs (user 0.040+0.000 sys 0.010+0.000)
(after)
time: real 0.020 secs (user 0.000+0.000 sys 0.010+0.000)

diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -737,8 +737,10 @@ def revrange(repo, revs):
                 end = revfix(repo, end, len(repo) - 1)
                 if end == nullrev and start < 0:
                     start = nullrev
-                rangeiter = repo.changelog.revs(start, end)
-                l = revset.baseset(rangeiter)
+                if start < end:
+                    l = revset.spanset(repo, start, end + 1)
+                else:
+                    l = revset.spanset(repo, start, end - 1)
                 subsets.append(l)
                 continue
             elif spec and spec in repo: # single unquoted rev


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