[PATCHv4] gitweb: generate parent..current URLs

[Giuseppe Bilotta <giuseppe.bilotta@gmail.com>]

If use_pathinfo is enabled, href now creates links that contain paths in
the form $project/$action/oldhash:/oldname..newhash:/newname for actions
that use hash_parent etc.

If any of the filename contains two consecutive dots, it's kept as a CGI
parameter since the resulting path would otherwise be ambiguous.

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
---
 gitweb/gitweb.perl |   30 +++++++++++++++++++++++++-----
 1 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 89e360f..d863ef7 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -712,7 +712,8 @@ sub href (%) {
 		# try to put as many parameters as possible in PATH_INFO:
 		#   - project name
 		#   - action
-		#   - hash or hash_base:/filename
+		#   - hash_parent or hash_parent_base:/file_parent
+		#   - hash or hash_base:/file_name
 
 		# Strip any trailing / from $href, or we might get double
 		# slashes when the script is the DirectoryIndex
@@ -730,17 +731,36 @@ sub href (%) {
 			delete $params{'action'};
 		}
 
-		# Finally, we put either hash_base:/file_name or hash
+		# Next, we put hash_parent_base:/file_parent..hash_base:/file_name,
+		# stripping nonexistent or useless pieces
+		$href .= "/" if ($params{'hash_base'} || $params{'hash_parent_base'}
+			|| $params{'hash_parent'} || $params{'hash'});
 		if (defined $params{'hash_base'}) {
-			$href .= "/".esc_url($params{'hash_base'});
-			if (defined $params{'file_name'}) {
+			if (defined $params{'hash_parent_base'}) {
+				$href .= esc_url($params{'hash_parent_base'});
+				# skip the file_parent if it's the same as the file_name
+				delete $params{'file_parent'} if $params{'file_parent'} eq $params{'file_name'};
+				if (defined $params{'file_parent'} && $params{'file_parent'} !~ /\.\./) {
+					$href .= ":/".esc_url($params{'file_parent'});
+					delete $params{'file_parent'};
+				}
+				$href .= "..";
+				delete $params{'hash_parent'};
+				delete $params{'hash_parent_base'};
+			} elsif (defined $params{'hash_parent'}) {
+				$href .= esc_url($params{'hash_parent'}). "..";
+				delete $params{'hash_parent'};
+			}
+
+			$href .= esc_url($params{'hash_base'});
+			if (defined $params{'file_name'} && $params{'file_name'} !~ /\.\./) {
 				$href .= ":/".esc_url($params{'file_name'});
 				delete $params{'file_name'};
 			}
 			delete $params{'hash'};
 			delete $params{'hash_base'};
 		} elsif (defined $params{'hash'}) {
-			$href .= "/".esc_url($params{'hash'});
+			$href .= esc_url($params{'hash'});
 			delete $params{'hash'};
 		}
 	}
-- 
1.5.6.5