#! /usr/bin/perl

$newyear = "2014";
$filelistname = "";

$i = 0;

while ($ARGV[$i] ne "") {
  if ($ARGV[$i] eq "-y") {
    $i++;
    if ($ARGV[$i] ne "") {
      $newyear = $ARGV[$i];
      $i++;
    }
  }
  if ($ARGV[$i] eq "-f") {
    $i++;
    if ($ARGV[$i] ne "") {
      $filelistname = $ARGV[$i];
      $i++;
    }
  }
}

print "building file list ...\n";
if ($filelistname eq "") {
  @files = `grep -l '(C) Copyright 1992,' \`find -type f -perm -u=w\``;
}
else {
  @files = `grep -l '(C) Copyright 1992,' \`cat $filelistname\``;
}
print "...Ok, now processing\n";

$total = 0;

#foreach $i (@files) {print "$i";} exit;

foreach $i (@files) {
  chop $i;
  $total++;
  print "processing $i\n";
  open(FIN, "<$i") || die "Can't open $i";
  open(FOUT, ">$i.new") || die "Can't open $i.new";
  $changed_it = 0;
  LINE: while (<FIN>) {
     $line = $_;
     if (/\(C\) Copyright 1992,[^0-9]+([0-9]+)\s+the\s+\"DOSEMU/) {
       $line =~ s/$1/$newyear/;
       $changed_it = 1;
     }
     print FOUT "$line";
  }
  close(FOUT);
  close(FIN);
  if ($changed_it) {
    `mv $i.new $i`;
  }
  else {
    `rm -f $i.new`;
     $total--;
  }
}

print "$total files converted\n";