[PATCH] gitweb: Better processing format string in custom links in navbar

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Make processing format string in custom links in action bar ('actions'
feature) more robust.  Now there would be no problems if one of
expanded values (for example project name, of project filename)
contains '%'; additionally format string supports '%' escaping by
doubling, i.e. '%%' expands to '%'.

Signed-off-by: Jakub Narebski <jnareb@xxxxxxxxx>
---
Neither of parameters we expand to ($projec, $git_dir, $treehash,
$treebase) is ensured to have no '%' in the value.  Therefore
sequential expansion, i.e. expanding one parameter after another could
lead to error.

Also there was no way to put '%' on the link; now it is possible
thanks to '%%' -> '%' expansion.

I have tred to be not too generic; you can check unquote() subroutine
to see how such more generic function (something like tsprintf_simple)
should look like


Pasky, could you check if it works correctly?

 gitweb/gitweb.perl |   19 ++++++++++++-------
 1 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 1116800..cc6edbe 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -290,10 +290,10 @@ our %feature = (
 
 	# The 'default' value consists of a list of triplets in the form
 	# (label, link, position) where position is the label after which
-	# to inster the link and link is a format string where %n expands
+	# to insert the link and link is a format string where %n expands
 	# to the project name, %f to the project path within the filesystem,
 	# %h to the current hash (h gitweb parameter) and %b to the current
-	# hash base (hb gitweb parameter).
+	# hash base (hb gitweb parameter); %% expands to %.
 
 	# To enable system wide have in $GITWEB_CONFIG e.g.
 	# $feature{'actions'}{'default'} = [('graphiclog',
@@ -2866,14 +2866,19 @@ sub git_print_page_nav {
 	$arg{'tree'}{'hash_base'} = $treebase if defined $treebase;
 
 	my @actions = gitweb_check_feature('actions');
+	my %repl = (
+		'%' => '%',
+		'n' => $project,         # project name
+		'f' => $git_dir,         # project path within filesystem
+		'h' => $treehead || '',  # current hash ('h' parameter)
+		'b' => $treebase || '',  # hash base ('hb' parameter)
+	);
 	while (@actions) {
-		my ($label, $link, $pos) = (shift(@actions), shift(@actions), shift(@actions));
+		my ($label, $link, $pos) = splice(@actions,0,3);
+		# insert
 		@navs = map { $_ eq $pos ? ($_, $label) : $_ } @navs;
 		# munch munch
-		$link =~ s#%n#$project#g;
-		$link =~ s#%f#$git_dir#g;
-		$treehead ? $link =~ s#%h#$treehead#g : $link =~ s#%h##g;
-		$treebase ? $link =~ s#%b#$treebase#g : $link =~ s#%b##g;
+		$link =~ s/%([%nfhb])/$repl{$1}/g;
 		$arg{$label}{'_href'} = $link;
 	}
 

-- 
Stacked GIT 0.14.3
git version 1.6.0.2
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