#! /usr/bin/perl -w

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

use utf8;
use encoding 'utf8';
use open ':utf8'; # input and output default layer will be UTF-8
use POSIX;
my (@toc_p, @toc_c, @toc_t);
my $toc_n=0;
my (@ntoc_p, @ntoc_c, @ntoc_t);
my $ntoc_n=0;

sub get_i($) {
  my $p=shift;
  my $i;
  $p=~s/_([^\/]*)//g;
  for $i (0..$toc_n-1) {
    if ($toc_p[$i] eq $p) {return int($i);}
  }
  return -1;
}

sub get_stub_title($) {
  my $fn=shift;
  my $p;
  my $t='';
  $p=$fn;
  $p=~s/_([^\/]*)//g;
  if ($fn =~ /\/?([^\/]*_)([^\/]+)$/) {$t=$2}
  if ($t) {return $t}
  if (-f $fn) {
    open T, $fn;
    $t=<T>; # get first line
    chomp $t;
    close T;
  }
  if ($t) {return $t}
  my $i=get_i($fn);
  if ($i>=0) {return $toc_t[$i]}
  return $fn;
}

sub update_toc($) {
  my $fn=shift;
  my ($p,$t,$i);
  my $c='2';
  $p=$fn;
  $p=~s/_([^\/]*)//g;
  $t=get_stub_title($fn);
  if (-d $fn) {
    $c='5';
  }
  $i=$ntoc_n;
  ($ntoc_p[$i],$ntoc_c[$i],$ntoc_t[$i])=($p,$c,$t);
  $ntoc_n=$ntoc_n+1;
}

sub recursive_plus {
  my $dir=shift;
  my $func= shift;
  my $i;
  my $j;
  my @a;
  &$func ("$dir") unless ($dir eq "." or $dir eq "./");
  opendir D, $dir;
  @a=readdir D;
  @a=grep {
    ($_ ne ".") && ($_ ne "..") && ($_ ne "+")
  } @a;
  @a=sort @a;
  foreach $i (@a) {
	$j=$dir."/".$i;
	$j=~s/\/\//\//; # remove repeated //
	$j=~s/^\.\///; # remove leading ./
	$j=~s/\/$//; # remove tailing /
	if (-d $j) {recursive_plus("$j",$func);}
	else {&$func ("$j");}
  }
  closedir D;
}
sub cd_th {
  my $pwd=getcwd();
  do {
    if (-d "+") {return $pwd;}
    chdir("..");
    $pwd=getcwd();
  }until ($pwd eq "/");
  return 0;
}

my $prefix;
$prefix=cd_th() or die "Could not found Thwab control + directory";
printf "@<%s>\n",$prefix;
if (open TOC ,$prefix."/+/1") {
while (<TOC>) {
  chomp;
  if (/^\s*(\S+)\s*(\S)\s*(.*)$/) {
    ($toc_p[$toc_n],$toc_c[$toc_n],$toc_t[$toc_n])=
    	($1,$2,$3);
    $toc_n=$toc_n+1;
  }
 }
close TOC;
} else {$toc_n=0}

&recursive_plus (".", \&update_toc);
open TOC ,">".$prefix."/+/1" or die "could not write to toc file";
for $i (0..$ntoc_n-1) {
  printf TOC "%s\t%s\t%s\n",$ntoc_p[$i],$ntoc_c[$i],$ntoc_t[$i];
}
close TOC

