#!/usr/bin/perl

# $1 is the filename header to use if not using env variables

use strict;
my($temp);

while(<STDIN>){
  while(/(.*)%(.+)%(.*)/){
#    print STDERR "Found: $2, replacing with $ENV{$2}\n";
    if($ARGV[0] eq ""){
      $_ = "$1" . $ENV{$2} . "$3\n";
    }
    else{
      $temp=`cat $ARGV[0]-$2`;
      chomp $temp;
      chomp $temp;

      $_ = "$1$temp$3\n";
      }
    }

  print "$_";
  }