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.
% init
% commit
adding a
% annotate -c
8435f90966e4: a
% annotate -d
Thu Jan 01 00:00:01 1970 +0000: a
% annotate -n
0: a
% annotate -u
nobody: a
% annotate -cdnu
nobody 0 8435f90966e4 Thu Jan 01 00:00:01 1970 +0000: a
% annotate b
2: a
2: a
2: a
3: b
3: b
3: b
% annotate -nf b
0 a: a
1 a: a
1 a: a
3 b: b
3 b: b
3 b: b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
merging b
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
% annotate after merge
0 a: a
1 a: a
1 a: a
3 b: b
4 b: c
3 b: b
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
merging b
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
% annotate after rename merge
0 a: a
6 b: z
1 a: a
3 b: b
4 b: c
3 b: b
7 b: d
% linkrev vs rev
0: a
1: a
1: a