Re: [PATCH 2/n] gitweb: Use '&iquot;' instead of '?' in esc_path

[Jakub Narebski <jnareb@gmail.com>]

 Junio C Hamano wrote:
>
> Junio C Hamano <junkio@cox.net> writes:
> 
>> Jakub Narebski <jnareb@gmail.com> writes:
>>
>>> Use "&iquot;" Latin 1 entity ("&#191;" -- inverted question mark =
>>> turned question mark, U+00BF ISOnum) instead '?' as replacements for
>>> control characters and other undisplayable characters.
>>>
>>> Signed-off-by: Jakub Narebski <jnareb@gmail.com>
>>
>> Do you have something against our Spanish and Latin American
>> friends?  ;-)
>>
>> I wonder if there is a more suitable replacement character that
>> is accepted across scripts?
> 
> I have a suspicion that instead of finding an exotic character,
> just showing the byte value in \octal, perhaps in different
> color, might be more portable and easier.  For one thing, it
> helps to show the exact byte value than just one substitution
> character if you are troubleshooting gitweb.
 
Or perhaps we can use Unicode Control Pictures U+2400 – U+243F 
(9216–9279) ("Unicode quoting"):

http://www.alanwood.net/unicode/control_pictures.html
http://www.unicode.org/charts/PDF/U2400.pdf

# quote unsafe characters and escape filename to HTML
sub esc_path {
	my $str = shift;
	$str = esc_html($str);
	$str =~ s!([[:cntrl:]])!sprintf('<span class="cntrl">&#%04d;</span>', 9216+ord($1))!eg;
	return $str;
}

with perhaps the following CSS

span.cntrl {
	border: dashed #aaaaaa;
	border-width: 1px;
	padding: 0px 2px 0px 2px;
	margin:  0px 2px 0px 2px;
}

What do you think of it?
-- 
Jakub Narebski