#!/usr/bin/perl -w
# Resort a ``re-arranged'' INDEX-MM to something close to original "INDEX"
#
## Shell : sort INDEX-MM|sed '/^$/d; /^\s*DATASETS *$/d'
#
# Real trick: first `wrap around the lines' , at the end unwrap again
my (@Lin, $l, $opt_d);
$l = 0;
while (<>) {
  chomp;
  next if /^$/; # drop empty lines
  if (/^\s+/) { # wrap this to last
    next if /\bDATASETS\b/;
    print STDERR "wrapping «$_» to $l ..\n" if $opt_d;
    $Lin[$l] .= "\n$_";
  } else {
    $Lin[$l] = $_;
    $l++;
  }
  print STDERR "$l: $Lin[$l]\n" if $opt_d;
}
# Sort the (remaining) lines alphabetically,
# Write them out, unwrapping `automatically', since there's "\n":
foreach (sort(@Lin)) {
  print "$_\n";
}