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

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.

Signed-off-by: Jakub Narebski <redacted>
---
RFC because I want to ask if we should default to HEAD if hash is not
provided for commit and commitdiff views, or should we error out with
more reasonable error message.

 gitweb/gitweb.perl |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 3118cb0..8313517 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl

@@ -3391,6 +3391,7 @@ sub git_log {
 }
 
 sub git_commit {
+	$hash ||= $hash_base || "HEAD";
 	my %co = parse_commit($hash);
 	if (!%co) {
 		die_error(undef, "Unknown commit object");

@@ -3668,6 +3669,7 @@ 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