[PATCH 1/3] gitweb: Easier adding/changing parameters to current URL

[Jakub Narebski <jnareb@gmail.com>]

Add boolean option '-replay' to href() subroutine, which is used to
generate links in gitweb.  This option "replays" current URL,
overriding it with provided parameters.  It means that current value
of each CGI parameter is used unless otherwise provided.

This change is meant to make it easier to generate links which differ
from current page URL only by one parameter, for example the same view
but sorted by different column:
  href(-replay=>1, order=>"age")
or view which differs by some option, e.g. in log views
  href(-replay=>1, extra_options=>"--no-merges")
or alternate view of the same object, e.g. in the 'blob' view
  href(-replay=>1, action=>"blob_plain")

Actual use of this functionality is left for later.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
 gitweb/gitweb.perl |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index e36dec1..eaab895 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -611,6 +611,15 @@ sub href(%) {
 	);
 	my %mapping = @mapping;
 
+	if ($params{-replay}) {
+		while (my ($name, $symbol) = each %mapping) {
+			if (!exists $params{$name}) {
+				# to allow for multivalued params we use arrayref form
+				$params{$name} = [ $cgi->param($symbol) ];
+			}
+		}
+	}
+
 	$params{'project'} = $project unless exists $params{'project'};
 
 	my ($use_pathinfo) = gitweb_check_feature('pathinfo');
-- 
1.5.3.4