gitweb.js: Harden setting blamed commit info in incremental blame

Internet Explorer 8 stops at beginning of blame filling with the
following bug:

  "firstChild is null or not an object"

at this line:

  a_sha1.firstChild.data = commit.sha1.substr(0, 8);

It is (probably) caused by the fact that while a_sha1 element, which
looks like this:

  <a href=""> </a>

It has a firstChild which is a text node containing only whitespace
(single space character) in other web browsers (Firefox 3.5, Opera 10,
Google Chrome 3.0), IE8 clobbers DOM, removing trailing/leading
whitespace.

Protect against this bug by creating text element if it does not
exist.

Found-by: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/gitweb/gitweb.js b/gitweb/gitweb.js
index f1ba9ae52bcb5f998069e37810b0a87836fd205a..5292c37d2ccfb6e9d93cf284d7da215932f1a5b1 100644 (file)
--- a/gitweb/gitweb.js
+++ b/gitweb/gitweb.js
@@ -562,7 +562,12 @@ function handleLine(commit, group) {
                        td_sha1.rowSpan = group.numlines;
 
                        a_sha1.href = projectUrl + 'a=commit;h=' + commit.sha1;
-                       a_sha1.firstChild.data = commit.sha1.substr(0, 8);
+                       if (a_sha1.firstChild) {
+                               a_sha1.firstChild.data = commit.sha1.substr(0, 8);
+                       } else {
+                               a_sha1.appendChild(
+                                       document.createTextNode(commit.sha1.substr(0, 8)));
+                       }
                        if (group.numlines >= 2) {
                                var fragment = document.createDocumentFragment();
                                var br   = document.createElement("br");