[PATCH 4/5] gitweb: Add git_url subroutine, and use it to quote full URLs

[Jakub Narebski <jnareb@gmail.com>]

Add git_url subroutine, which does what git_param did before commit
a2f3db2f5de2a3667b0e038aa65e3e097e642e7d, and is used to quote full
URLs, currently only $home_link.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
It will also be used in patch inspired by
  "[RFC][PATCH] gitweb: Make the Git logo link target to point to the homepage"
  Message-ID: <7virjes7dq.fsf@assigned-by-dhcp.cox.net>
  http://permalink.gmane.org/gmane.comp.version-control.git/27619

 gitweb/gitweb.perl |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 7fce9a6..b51e061 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -446,6 +446,15 @@ sub esc_param {
 	return $str;
 }
 
+# quote unsafe chars in whole URL, so some charactrs cannot be quoted
+sub esc_url {
+	my $str = shift;
+	$str =~ s/([^A-Za-z0-9\-_.~();\/;?:@&=])/sprintf("%%%02X", ord($1))/eg;
+	$str =~ s/\+/%2B/g;
+	$str =~ s/ /\+/g;
+	return $str;
+}
+
 # replace invalid utf8 character with SUBSTITUTION sequence
 sub esc_html {
 	my $str = shift;
@@ -1362,7 +1371,7 @@ EOF
 	      "<a href=\"http://www.kernel.org/pub/software/scm/git/docs/\" title=\"git documentation\">" .
 	      "<img src=\"$logo\" width=\"72\" height=\"27\" alt=\"git\" style=\"float:right; border-width:0px;\"/>" .
 	      "</a>\n";
-	print $cgi->a({-href => esc_param($home_link)}, $home_link_str) . " / ";
+	print $cgi->a({-href => esc_url($home_link)}, $home_link_str) . " / ";
 	if (defined $project) {
 		print $cgi->a({-href => href(action=>"summary")}, esc_html($project));
 		if (defined $action) {
-- 
1.4.2.1