#!/usr/local/bin/perl
#                              -*- Mode: Perl -*- 
# makeactive.ps -- 
# ITIID           : $ITI$ $Header $__Header$
# Author          : Ulrich Pfeifer
# Created On      : Wed Dec  8 13:55:14 1993
# Last Modified By: Ulrich Pfeifer
# Last Modified On: Wed Dec  8 15:38:55 1993
# Update Count    : 18
# Status          : Unknown, Use with caution!
# 


$home = $ENV{'HOME'} || $ENV{'LOGDIR'} ||
    (getpwuid($<))[7] || die "You're homeless!\n";

($tree) = @ARGV;
$tree = "Mail" unless $tree;

$activefile = "$home/.active-:$tree";

open(ACTIVE, ">$activefile") || die "Coul not open $activefile: $!\n";

chdir $home;
&find($tree);

close(ACTIVE);

exit 0;

sub find {
    chop($cwd = `pwd`);
    foreach $topdir (@_) {
	(($topdev,$topino,$topmode,$topnlink) = stat($topdir))
	  || (warn("Can't stat $topdir: $!\n"), next);
	if (-d _) {
	    if (chdir($topdir)) {
		($dir,$_) = ($topdir,'.');
		$name = $topdir;
		#&wanted;
		$topdir =~ s,/$,, ;
		&finddir($topdir,$topnlink);
	    }
	    else {
		warn "Can't cd to $topdir: $!\n";
	    }
	}
	else {
	    unless (($dir,$_) = $topdir =~ m#^(.*/)(.*)$#) {
		($dir,$_) = ('.', $topdir);
	    }
	    $name = $topdir;
	    chdir $dir# && &wanted;
	}
	chdir $cwd;
    }
}

sub finddir {        
    local($dir,$nlink) = @_;
    local($dev,$ino,$mode,$subcount);
    local($name);
    local($min, $max, $group);

    # Get the list of files in the current directory.

    $group = $dir;
    $group =~ s:^$tree/::;
    $group =~ s:/:.:go;

    opendir(DIR,'.') || (warn "Can't open $dir: $!\n", return);
    local(@filenames) = readdir(DIR);
    closedir(DIR);

    if ($nlink == 2) {        # This dir has no subdirectories.
	for (@filenames) {
	    next if $_ eq '.';
	    next if $_ eq '..';
	    $name = "$dir/$_";
	    $nlink = 0;
	    if ( /^[0-9]*$/ ) {
                $min = $_ if !defined $min || $min >= $_;
                $max = $_ if !defined $min || $max <= $_;
            }
	}
    }
    else {                    # This dir has subdirectories.
	$subcount = $nlink - 2;
	for (@filenames) {
	    next if $_ eq '.';
	    next if $_ eq '..';
	    $nlink = $prune = 0;
	    $name = "$dir/$_";
            if ($subcount > 0) {    # Seen all the subdirs?
                # Get link count and check for directoriness.
                ($dev,$ino,$mode,$nlink) = lstat($_) unless $nlink;
		
                if (-d _) {

                    # It really is a directory, so do it recursively.
                    
                    if (!$prune && chdir $_) {
                        &finddir($name,$nlink);
                        chdir '..';
                    }
                    --$subcount;
                } else {
                    if ( /^[0-9]*$/ ) {
                        $min = $_ if !defined $min || $min >= $_;
                        $max = $_ if !defined $min || $max <= $_;
                    }
                }
            } else {
                if ( /^[0-9]*$/ ) {
                    $min = $_ if !defined $min || $min >= $_;
                    $max = $_ if !defined $min || $max <= $_;
                }
            }
	}
    }
    if (defined $max) {
        print ACTIVE "$group $max $min n\n";
        #print STDOUT "$group $max $min n\n";
    }
}
