gitweb: Streamify patch output in git_commitdiff

Change output of patch(set) in git_commitdiff from slurping whole diff
in @patchset array before processing, to passing file descriptor to
git_patchset_body.

Advantages: faster, incremental output, smaller memory footprint.
Disadvantages: cannot react when there is error during closing file
descriptor.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 1d3d9df752c67b35d603b70d7c12c69e14f62514..08e0472c6111d6e922a3ba6fc8d611abed96ac73 100755 (executable)
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -1539,7 +1539,7 @@ sub git_difftree_body {
 }
 
 sub git_patchset_body {
-       my ($patchset, $difftree, $hash, $hash_parent) = @_;
+       my ($fd, $difftree, $hash, $hash_parent) = @_;
 
        my $patch_idx = 0;
        my $in_header = 0;
@@ -1548,7 +1548,9 @@ sub git_patchset_body {
 
        print "<div class=\"patchset\">\n";
 
-       LINE: foreach my $patch_line (@$patchset) {
+       LINE:
+       while (my $patch_line @$fd>) {
+               chomp $patch_line;
 
                if ($patch_line =~ m/^diff /) { # "git diff" header
                        # beginning of patch (in patchset)
@@ -2727,7 +2729,6 @@ sub git_commitdiff {
        # read commitdiff
        my $fd;
        my @difftree;
-       my @patchset;
        if ($format eq 'html') {
                open $fd, "-|", $GIT, "diff-tree", '-r', '-M', '-C',
                        "--patch-with-raw", "--full-index", $hash_parent, $hash
@@ -2738,13 +2739,11 @@ sub git_commitdiff {
                        last unless $line;
                        push @difftree, $line;
                }
-               @patchset = map { chomp; $_ } <$fd>;
 
-               close $fd
-                       or die_error(undef, "Reading git-diff-tree failed");
        } elsif ($format eq 'plain') {
                open $fd, "-|", $GIT, "diff-tree", '-r', '-p', '-B', $hash_parent, $hash
                        or die_error(undef, "Open git-diff-tree failed");
+
        } else {
                die_error(undef, "Unknown commitdiff format");
        }
@@ -2806,8 +2805,8 @@ TEXT
                #git_difftree_body(\@difftree, $hash, $hash_parent);
                #print "<br/>\n";
 
-               git_patchset_body(\@patchset, \@difftree, $hash, $hash_parent);
-
+               git_patchset_body($fd, \@difftree, $hash, $hash_parent);
+               close $fd;
                print "</div>\n"; # class="page_body"
                git_footer_html();