gitweb: apply fallback encoding before highlight
Some multi-byte character encodings (such as Shift_JIS and GBK) have
characters whose final bytes is an ASCII '\' (0x5c), and they
will be displayed as funny-characters even if $fallback_encoding is
correct. This is because `highlight` command always expects UTF-8
encoded strings from STDIN.
$ echo 'my $v = "申";' | highlight --syntax perl | w3m -T text/html -dump
my $v = "申";
$ echo 'my $v = "申";' | iconv -f UTF-8 -t Shift_JIS | highlight \
--syntax perl | iconv -f Shift_JIS -t UTF-8 | w3m -T text/html -dump
iconv: (stdin):9:135: cannot convert
my $v = "
This patch prepare git blob objects to be encoded into UTF-8 before
highlighting in the manner of `to_utf8` subroutine.
Signed-off-by: Shin Kojima <shin@kojima.org>
Reviewed-by: Jakub Narębski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>