[PATCH 4/5] gitweb: Default to $hash_base or HEAD for $hash in "commit" and "commitdiff"

[Jakub Narebski <jnareb@gmail.com>]

Set $hash parameter to $hash_base || "HEAD" if it is not set (if it is
not true to be more exact). This allows [hand-edited] URLs with 'action'
"commit" or "commitdiff" but without 'hash' parameter.

If there is 'h' (hash) parameter provided, then gitweb tries
to use this. HEAD is used _only_ if nether hash, nor hash_base
are provided, i.e. for URL like below
  URL?p=project.git;a=commit
i.e. without neither 'h' nor 'hb'.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
 gitweb/gitweb.perl |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index eadaa31..5875ba0 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -3450,6 +3450,7 @@ sub git_log {
 }
 
 sub git_commit {
+	$hash ||= $hash_base || "HEAD";
 	my %co = parse_commit($hash);
 	if (!%co) {
 		die_error(undef, "Unknown commit object");
@@ -3727,6 +3728,7 @@ sub git_blobdiff_plain {
 
 sub git_commitdiff {
 	my $format = shift || 'html';
+	$hash ||= $hash_base || "HEAD";
 	my %co = parse_commit($hash);
 	if (!%co) {
 		die_error(undef, "Unknown commit object");
-- 
1.4.3.4