Change the minimum length of an abbreviated object identifier in the
commit message gitweb tries to turn into link from 8 hexchars to 7.

This arbitrary minimum length of 8 was introduced in bfe2191 ("gitweb:
SHA-1 in commit log message links to "object" view", 2006-12-10), but
the default abbreviation length is 7, and has been for a long time.

It's still possible to reference SHA1s down to 4 characters in length,
see v1.7.4-1-gdce9648's MINIMUM_ABBREV, but I can't see how to make
git actually produce that, so I doubt anyone is putting that into log
messages in practice, but people definitely do put 7 character SHA1s
into log messages.

I think it's fairly dubious to link to things matching [0-9a-fA-F]
here as opposed to just [0-9a-f], that dates back to the initial
version of gitweb from 161332a ("first working version",
2005-08-07). Git will accept all-caps SHA1s, but didn't ever produce
them as far as I can tell.

Signed-off-by: Ævar Arnfjörð Bjarmason <ava...@gmail.com>
---
 gitweb/gitweb.perl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index cba7405..92b5e91 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -2036,7 +2036,7 @@ sub format_log_line_html {
        my $line = shift;
 
        $line = esc_html($line, -nbsp=>1);
-       $line =~ s{\b([0-9a-fA-F]{8,40})\b}{
+       $line =~ s{\b([0-9a-fA-F]{7,40})\b}{
                $cgi->a({-href => href(action=>"object", hash=>$1),
                                        -class => "text"}, $1);
        }eg;
-- 
2.9.3

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