#!/bin/perl
# add bookmark to pdf, at most two levels
use strict;
use PDF::Reuse;
use File::Basename;
my ($oldfile, $toc, $gap) = @ARGV;
my $newfile = basename($oldfile, '.pdf') . '_new.pdf';
our $lastpage = 0;
sub insertbookmark(@){
    my ($chapter, @section) = @_ or return;
    my %items = (text => $chapter->{text},
    			 act => $chapter->{act}
    			);
    @items{'close', 'kids'} = (1, \@section) if @section;
    prBookmark(\%items);
}
sub valid($){
	my $line = shift;
	my ($text, $page) = $line =~ /^(.+)\t(\d+)$/ or die $line, 'is ill formatted';
    # ()have to escape
	$text =~ s/([()])/\\\1/g;
	warn $text, ' on page ', $page, ' must be wrong' if $page < $lastpage;
	$lastpage = $page;
	return ($text, $page);
}
prFile($newfile);
prDoc($oldfile) or die;
open my $fh, '<', $toc or die;
my @section;
while (<$fh>){
  chomp;
  my $flag = s/^\t//;# at most one tab
  my ($text, $page) = valid $_;
  $page += ($gap - 1);
  my $bookmark = { text => $text,
                   act => "$page, 40, 700"};
  unless ($flag){
	insertbookmark @section;
    @section = ();
  }
  push @section, $bookmark;
}
insertbookmark @section;
prEnd();