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git-svn: speed up blame command

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'git svn blame' now uses the 'git cat-file --batch' command to
speed up resolving SVN revision number out of commit SHA by
removing fork+exec overhead.

[ew: enforced 80-column line wrap]

Signed-off-by: Boris Byk <boris.byk@gmail.com>
Acked-by: Eric Wong <normalperson@yhbt.net>
This commit is contained in:
Boris Byk
2009-04-11 00:32:41 +04:00
committed by Eric Wong
parent c2abd83fea
commit 6ea4203288
1 changed files with 50 additions and 4 deletions
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54
git-svn.perl
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@ -47,7 +47,8 @@ BEGIN {
# import functions from Git into our packages, en masse
no strict 'refs';
foreach (qw/command command_oneline command_noisy command_output_pipe
command_input_pipe command_close_pipe/) {
command_input_pipe command_close_pipe
command_bidi_pipe command_close_bidi_pipe/) {
for my $package ( qw(SVN::Git::Editor SVN::Git::Fetcher
Git::SVN::Migration Git::SVN::Log Git::SVN),
__PACKAGE__) {
@ -1264,6 +1265,40 @@ sub cmt_metadata {
command(qw/cat-file commit/, shift)))[-1]);
}
sub cmt_sha2rev_batch {
my %s2r;
my ($pid, $in, $out, $ctx) = command_bidi_pipe(qw/cat-file --batch/);
my $list = shift;
foreach my $sha (@{$list}) {
my $first = 1;
my $size = 0;
print $out $sha, "\n";
while (my $line = <$in>) {
if ($first && $line =~ /^[[:xdigit:]]{40}\smissing$/) {
last;
} elsif ($first &&
$line =~ /^[[:xdigit:]]{40}\scommit\s(\d+)$/) {
$first = 0;
$size = $1;
next;
} elsif ($line =~ /^(git-svn-id: )/) {
my (undef, $rev, undef) =
extract_metadata($line);
$s2r{$sha} = $rev;
}
$size -= length($line);
last if ($size == 0);
}
}
command_close_bidi_pipe($pid, $in, $out, $ctx);
return \%s2r;
}
sub working_head_info {
my ($head, $refs) = @_;
my @args = ('log', '--no-color', '--first-parent', '--pretty=medium');
@ -5001,11 +5036,22 @@ sub cmd_blame {
'--', $path);
my ($sha1);
my %authors;
my @buffer;
my %dsha; #distinct sha keys
while (my $line = <$fh>) {
push @buffer, $line;
if ($line =~ /^([[:xdigit:]]{40})\s\d+\s\d+/) {
$sha1 = $1;
(undef, $rev, undef) = ::cmt_metadata($1);
$rev = '0' if (!$rev);
$dsha{$1} = 1;
}
}
my $s2r = ::cmt_sha2rev_batch([keys %dsha]);
foreach my $line (@buffer) {
if ($line =~ /^([[:xdigit:]]{40})\s\d+\s\d+/) {
$rev = $s2r->{$1};
$rev = '0' if (!$rev)
}
elsif ($line =~ /^author (.*)/) {
$authors{$rev} = $1;