[PATCH 2/2] gitweb: Improve behavior for actionless path_info gitweb URLs

[Jakub Narebski <jnareb@gmail.com>]

Eli Barzilay noticed that

  http://server/gitweb/project/<commit-sha1>

link goes to 'shortlog' view, while 'commit' view would be more
useful, but that 'shortlog' action is more apropriate for

  http://server/gitweb/project/<commit-sha1>..<other-commit-sha1>

links.


Therefore for the case when we don't have either action, or filename,
or parent hash [base] in path_info-based URL, i.e. for

  http://server/gitweb/project/<object-id>

link, instead of using 'shortlog' view we allow dispatch() subroutine
to detect type of object and use appropriate action (in most case it
would be either 'commit' action, or 'tag', or 'tree' for top
directory).

Requested-by: Eli Barzilay <eli@barzilay.org>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Tested-by: Eli Barzilay <eli@barzilay.org>
---
This is one-line (discounting comments and braces) alternative
solution to the one proposed by Eli in the

  http://thread.gmane.org/gmane.comp.version-control.git/150527

thread from 8 July 2010.

A side-effect of this patch was discovering (and fixing in previous
commit) long standing bug in corner case of path_info URLs parsing.

 gitweb/gitweb.perl |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 9116a0e..928b5c0 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -819,8 +819,15 @@ sub evaluate_path_info {
 		# hash_base instead. It should also be noted that hand-crafted
 		# links having 'history' as an action and no pathname or hash
 		# set will fail, but that happens regardless of PATH_INFO.
-		$input_params{'action'} ||= "shortlog";
-		if (grep { $_ eq $input_params{'action'} } @wants_base) {
+		if (defined $parentrefname) {
+			# if there is parent let the default be 'shortlog' action
+			# (for http://git.example.com/repo.git/A..B links); if there
+			# is no parent, dispatch will detect type of object and set
+			# action appropriately if required (if action is not set)
+			$input_params{'action'} ||= "shortlog";
+		}
+		if ($input_params{'action'} &&
+		    grep { $_ eq $input_params{'action'} } @wants_base) {
 			$input_params{'hash_base'} ||= $refname;
 		} else {
 			$input_params{'hash'} ||= $refname;