HEX-ify plains that need it

hexify.pl

#!/usr/bin/env perl
#-----------------------------------------------------------------------
# Created: 2017-11-21
# $Id: hexify,v 1.2 2017/11/22 06:29:35 root Exp root $
#-----------------------------------------------------------------------
# FIXME -  special cases:
# - Single \x0a is valid utf8, but should be hexed
#-----------------------------------------------------------------------

while (<>) {

    chomp;

    # If it looks like utf8, print it.
    if (eval "\$test = decode( 'utf8', \$_, Encode::FB_CROAK )") {
            print $_;
    } else {
            # If it isn't in the 7-bit ASCII printable range, HEX it.
            if ( /[^\x20-\x39\x3b-\x7e]/ ) {
                    print '$HEX[' . unpack("H*", $_) . ']';
            } else {
                    print $_;
            }
    }
    print "\n";
}
#-----------------------------------------------------------------------