revset: added lazyset implementation to keyword revset
Performance benchmarking:
$ time hg log -qr "first(keyword(changeset))"
0:9117c6561b0b
real 0m3.466s
user 0m3.345s
sys 0m0.072s
$ time ./hg log -qr "first(keyword(changeset))"
0:9117c6561b0b
real 0m0.365s
user 0m0.199s
sys 0m0.083s
# strutil.py - string utilities for Mercurial
#
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
def findall(haystack, needle, start=0, end=None):
if end is None:
end = len(haystack)
if end < 0:
end += len(haystack)
if start < 0:
start += len(haystack)
while start < end:
c = haystack.find(needle, start, end)
if c == -1:
break
yield c
start = c + 1
def rfindall(haystack, needle, start=0, end=None):
if end is None:
end = len(haystack)
if end < 0:
end += len(haystack)
if start < 0:
start += len(haystack)
while end >= 0:
c = haystack.rfind(needle, start, end)
if c == -1:
break
yield c
end = c - 1