util._matcher: speed up regexp matching.
In 4babaa52badf, Benoit made a change that substantially slows matching
when a big .hgignore file is in play, because it calls into the regexp
matching engine potentially hundreds of times per file to be matched.
I've partly rolled back his change, so that we only call into the matcher
once per file, but preserved the ability to report a meaningful error
message if there's a syntax error in the regexp.
#!/bin/sh
set -e
echo "[extensions]" >> $HGRCPATH
echo "hbisect=" >> $HGRCPATH
echo % init
hg init
echo % committing changes
count=0
echo > a
while test $count -lt 32 ; do
echo 'a' >> a
test $count -eq 0 && hg add
hg ci -m "msg $count" -d "$count 0"
echo % committed changeset $count
count=`expr $count + 1`
done
echo % log
hg log
echo % hg up -C
hg up -C
echo % bisect test
hg bisect init
hg bisect bad
hg bisect good 1
hg bisect good
hg bisect good
hg bisect good
hg bisect bad
hg bisect good