From 65910395c08e3dc4be685a9a9f60adfa61c89aa5 Mon Sep 17 00:00:00 2001
From: Luben Tuikov <ltuikov@yahoo.com>
Date: Tue, 26 Sep 2006 16:45:31 -0700
Subject: [PATCH] gitweb: extend blame to show links to diff and previous

git_blame2() now has two more columns, "Prev" and "Diff",
before the "Commit" column, as follows:

Prev	Diff	Commit	Line	Data
SHA     Diff    SHA        N    ...
...

The "Prev" column shows the SHA of the parent commit,
between which this line changed.  Clicking on it shows the
blame of the file as of the parent commit, for that line.

So clicking repeatedly on "Prev" would show you the blame
of that file, from the point of view of the changes
of that particular line whose "Prev" you're clicking on.

The "Diff" column shows "Diff" which is a link to blobdiff
between "Prev" and "Commit" commits _for that line_.

So clicking on "Diff" would show you the blobdiff (HTML)
between the parent commit and this commit which changed
that particular line.

Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
---
 gitweb/gitweb.perl | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index fa8a65a80..e769c8ed6 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -2439,7 +2439,7 @@ sub git_blame2 {
 	print <<HTML;
 <div class="page_body">
 <table class="blame">
-<tr><th>Commit</th><th>Line</th><th>Data</th></tr>
+<tr><th>Prev</th><th>Diff</th><th>Commit</th><th>Line</th><th>Data</th></tr>
 HTML
 	while (<$fd>) {
 		/^([0-9a-fA-F]{40}).*?(\d+)\)\s{1}(\s*.*)/;
@@ -2447,6 +2447,8 @@ HTML
 		my $rev = substr($full_rev, 0, 8);
 		my $lineno = $2;
 		my $data = $3;
+		my %pco = parse_commit($full_rev);
+		my $parent = $pco{'parent'};
 
 		if (!defined $last_rev) {
 			$last_rev = $full_rev;
@@ -2455,11 +2457,25 @@ HTML
 			$current_color = ++$current_color % $num_colors;
 		}
 		print "<tr class=\"$rev_color[$current_color]\">\n";
+		# Print the Prev link
+		print "<td class=\"sha1\">";
+		print $cgi->a({-href => href(action=>"blame", hash_base=>$parent, file_name=>$file_name)},
+			      esc_html(substr($parent, 0, 8)));
+		print "</td>\n";
+		# Print the Diff (blobdiff) link
+		print "<td>";
+		print $cgi->a({-href => href(action=>"blobdiff", file_name=>$file_name, hash_parent_base=>$parent,
+					     hash_base=>$full_rev)},
+			      esc_html("Diff"));
+		print "</td>\n";
+		# Print the Commit link
 		print "<td class=\"sha1\">" .
 			$cgi->a({-href => href(action=>"commit", hash=>$full_rev, file_name=>$file_name)},
 			        esc_html($rev)) . "</td>\n";
+		# Print the Line number
 		print "<td class=\"linenr\"><a id=\"l$lineno\" href=\"#l$lineno\" class=\"linenr\">" .
 		      esc_html($lineno) . "</a></td>\n";
+		# Print the Data
 		print "<td class=\"pre\">" . esc_html($data) . "</td>\n";
 		print "</tr>\n";
 	}
-- 
2.30.2