view tests/svn-safe-append.py @ 38971:ee97f7a677f3

linelog: optimize replacelines

The optimization to avoid calling `annotate` inside `replacelines` is significant
for practical use patterns.

Before this patch:

  hg perflinelogedits
  ! wall 6.778478 comb 6.710000 user 6.700000 sys 0.010000 (best of 3)

After this patch:

  hg perflinelogedits
  ! wall 0.136573 comb 0.140000 user 0.130000 sys 0.010000 (best of 63)

Differential Revision: https://phab.mercurial-scm.org/D4150

#!/usr/bin/env python

from __future__ import absolute_import

__doc__ = """Same as `echo a >> b`, but ensures a changed mtime of b.
Without this svn will not detect workspace changes."""

import os
import stat
import sys

text = sys.argv[1]
fname = sys.argv[2]

f = open(fname, "ab")
try:
    before = os.fstat(f.fileno())[stat.ST_MTIME]
    f.write(text)
    f.write("\n")
finally:
    f.close()
inc = 1
now = os.stat(fname)[stat.ST_MTIME]
while now == before:
    t = now + inc
    inc += 1
    os.utime(fname, (t, t))
    now = os.stat(fname)[stat.ST_MTIME]