From eeef88cd20f2965325cde66e97a616bce4a757f0 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <junkio@cox.net>
Date: Thu, 5 Oct 2006 13:55:58 -0700
Subject: [PATCH] gitweb: use blame --porcelain

This makes gitweb (git_blame2) use "blame --porcelain", which
lets the caller to figure out which line in the original version
each line comes from.  Using this information, change the
behaviour of clicking the line number to go to the line of the
blame output for the original commit.

Before, clicking the line number meant "scoll up to show this
line at the beginning of the page", which was not all that
useful.  The new behaviour lets you click on the line you are
interested in to view the line in the context it was introduced,
and keep digging deeper as you examine it.

Signed-off-by: Junio C Hamano <junkio@cox.net>
---
 gitweb/gitweb.perl | 65 +++++++++++++++++++++++++++++++---------------
 1 file changed, 44 insertions(+), 21 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 0ac05cc718..68347ac975 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -974,6 +974,9 @@ sub parse_date {
 	$date{'hour_local'} = $hour;
 	$date{'minute_local'} = $min;
 	$date{'tz_local'} = $tz;
+	$date{'iso-tz'} = sprintf ("%04d-%02d-%02d %02d:%02d:%02d %s",
+				   1900+$year, $mon+1, $mday,
+				   $hour, $min, $sec, $tz);
 	return %date;
 }
 
@@ -2501,7 +2504,8 @@ sub git_blame2 {
 	if ($ftype !~ "blob") {
 		die_error("400 Bad Request", "Object is not a blob");
 	}
-	open ($fd, "-|", git_cmd(), "blame", '-l', '--', $file_name, $hash_base)
+	open ($fd, "-|", git_cmd(), "blame", '--porcelain', '--',
+	      $file_name, $hash_base)
 		or die_error(undef, "Open git-blame failed");
 	git_header_html();
 	my $formats_nav =
@@ -2525,33 +2529,52 @@ sub git_blame2 {
 <table class="blame">
 <tr><th>Commit</th><th>Line</th><th>Data</th></tr>
 HTML
-	while (<$fd>) {
-		my ($full_rev, $author, $date, $lineno, $data) =
-			/^([0-9a-f]{40}).*?\s\((.*?)\s+([-\d]+ [:\d]+ [-+\d]+)\s+(\d+)\)\s(.*)/;
+	my %metainfo = ();
+	while (1) {
+		$_ = <$fd>;
+		last unless defined $_;
+		my ($full_rev, $lineno, $orig_lineno, $group_size) =
+		    /^([0-9a-f]{40}) (\d+) (\d+)(?: (\d+))?$/;
+		if (!exists $metainfo{$full_rev}) {
+			$metainfo{$full_rev} = {};
+		}
+		my $meta = $metainfo{$full_rev};
+		while (<$fd>) {
+			last if (s/^\t//);
+			if (/^(\S+) (.*)$/) {
+				$meta->{$1} = $2;
+			}
+		}
+		my $data = $_;
 		my $rev = substr($full_rev, 0, 8);
-		my $print_c8 = 0;
-
-		if (!defined $last_rev) {
-			$last_rev = $full_rev;
-			$print_c8 = 1;
-		} elsif ($last_rev ne $full_rev) {
-			$last_rev = $full_rev;
+		my $author = $meta->{'author'};
+		my %date = parse_date($meta->{'author-time'},
+				      $meta->{'author-tz'});
+		my $date = $date{'iso-tz'};
+		if ($group_size) {
 			$current_color = ++$current_color % $num_colors;
-			$print_c8 = 1;
 		}
 		print "<tr class=\"$rev_color[$current_color]\">\n";
-		print "<td class=\"sha1\"";
-		if ($print_c8 == 1) {
+		if ($group_size) {
+			print "<td class=\"sha1\"";
 			print " title=\"$author, $date\"";
-		}
-		print ">";
-		if ($print_c8 == 1) {
-			print $cgi->a({-href => href(action=>"commit", hash=>$full_rev, file_name=>$file_name)},
+			print " rowspan=\"$group_size\"" if ($group_size > 1);
+			print ">";
+			print $cgi->a({-href => href(action=>"commit",
+						     hash=>$full_rev,
+						     file_name=>$file_name)},
 				      esc_html($rev));
+			print "</td>\n";
 		}
-		print "</td>\n";
-		print "<td class=\"linenr\"><a id=\"l$lineno\" href=\"#l$lineno\" class=\"linenr\">" .
-		      esc_html($lineno) . "</a></td>\n";
+		my $blamed = href(action => 'blame',
+				  file_name => $meta->{'filename'},
+				  hash_base => $full_rev);
+		print "<td class=\"linenr\">";
+		print $cgi->a({ -href => "$blamed#l$orig_lineno",
+				-id => "l$lineno",
+				-class => "linenr" },
+			      esc_html($lineno));
+		print "</td>";
 		print "<td class=\"pre\">" . esc_html($data) . "</td>\n";
 		print "</tr>\n";
 	}