git-svn: bugfix and optimize the 'log' command

Revisions with long commit messages were being skipped, since
the 'git-svn-id' metadata line was at the end and git-log uses a
32k buffer to print the commits.

Also the last 'git-svn-id' metadata line in a commit is always
the valid one, so make sure we use that, as well.

Made the verbose flag work by passing the correct option switch
('--summary') to git-log.

Finally, optimize -r/--revision argument handling by passing
the appropriate limits to revision

Signed-off-by: Eric Wong <normalperson@yhbt.net>

diff --git a/contrib/git-svn/git-svn.perl b/contrib/git-svn/git-svn.perl
index 149149f..417fcf1 100755 (executable)
--- a/contrib/git-svn/git-svn.perl
+++ b/contrib/git-svn/git-svn.perl
@@ -663,17 +663,15 @@ sub show_log {
        my $pid = open(my $log,'-|');
        defined $pid or croak $!;
        if (!$pid) {
-               my @rl = (qw/git-log --abbrev-commit --pretty=raw
-                               --default/, "remotes/$GIT_SVN");
-               push @rl, '--raw' if $_verbose;
-               exec(@rl, @args) or croak $!;
+               exec(git_svn_log_cmd($r_min,$r_max), @args) or croak $!;
        }
        setup_pager();
        my (@k, $c, $d);
+
        while (<$log>) {
                if (/^commit ($sha1_short)/o) {
                        my $cmt = $1;
-                       if ($c && defined $c->{r} && $c->{r} != $r_last) {
+                       if ($c && cmt_showable($c) && $c->{r} != $r_last) {
                                $r_last = $c->{r};
                                process_commit($c, $r_min, $r_max, \@k) or
                                                                goto out;
@@ -692,8 +690,7 @@ sub show_log {
                } elsif ($d) {
                        push @{$c->{diff}}, $_;
                } elsif (/^    (git-svn-id:.+)$/) {
-                       my ($url, $rev, $uuid) = extract_metadata($1);
-                       $c->{r} = $rev;
+                       (undef, $c->{r}, undef) = extract_metadata($1);
                } elsif (s/^    //) {
                        push @{$c->{l}}, $_;
                }
@@ -715,6 +712,52 @@ out:
 
 ########################### utility functions #########################
 
+sub cmt_showable {
+       my ($c) = @_;
+       return 1 if defined $c->{r};
+       if ($c->{l} && $c->{l}->[-1] eq "...\n" &&
+                               $c->{a_raw} =~ /\@([a-f\d\-]+)>$/) {
+               my @msg = safe_qx(qw/git-cat-file commit/, $c->{c});
+               shift @msg while ($msg[0] ne "\n");
+               shift @msg;
+               @{$c->{l}} = grep !/^git-svn-id: /, @msg;
+
+               (undef, $c->{r}, undef) = extract_metadata(
+                               (grep(/^git-svn-id: /, @msg))[-1]);
+       }
+       return defined $c->{r};
+}
+
+sub git_svn_log_cmd {
+       my ($r_min, $r_max) = @_;
+       my @cmd = (qw/git-log --abbrev-commit --pretty=raw
+                       --default/, "refs/remotes/$GIT_SVN");
+       push @cmd, '--summary' if $_verbose;
+       return @cmd unless defined $r_max;
+       if ($r_max == $r_min) {
+               push @cmd, '--max-count=1';
+               if (my $c = revdb_get($REVDB, $r_max)) {
+                       push @cmd, $c;
+               }
+       } else {
+               my ($c_min, $c_max);
+               $c_max = revdb_get($REVDB, $r_max);
+               $c_min = revdb_get($REVDB, $r_min);
+               if ($c_min && $c_max) {
+                       if ($r_max > $r_max) {
+                               push @cmd, "$c_min..$c_max";
+                       } else {
+                               push @cmd, "$c_max..$c_min";
+                       }
+               } elsif ($r_max > $r_min) {
+                       push @cmd, $c_max;
+               } else {
+                       push @cmd, $c_min;
+               }
+       }
+       return @cmd;
+}
+
 sub fetch_child_id {
        my $id = shift;
        print "Fetching $id\n";
@@ -2206,6 +2249,7 @@ sub setup_pager { # translated to Perl from pager.c
 sub get_author_info {
        my ($dest, $author, $t, $tz) = @_;
        $author =~ s/(?:^\s*|\s*$)//g;
+       $dest->{a_raw} = $author;
        my $_a;
        if ($_authors) {
                $_a = $rusers{$author} || undef;
@@ -2440,7 +2484,7 @@ sub svn_grab_base_rev {
        close $fh;
        if (defined $c && length $c) {
                my ($url, $rev, $uuid) = extract_metadata((grep(/^git-svn-id: /,
-                       safe_qx(qw/git-cat-file commit/, $c)))[0]);
+                       safe_qx(qw/git-cat-file commit/, $c)))[-1]);
                return ($rev, $c);
        }
        return (undef, undef);