#!/usr/bin/perl
# bibtex_to_paper opens the paper corresponding to a bibtex key
# and is released under the terms of the GNU GPL version 3, or any
# later version, at your option. See the file README and COPYING for
# more information.
# Copyright 2014 by Don Armstrong <don@donarmstrong.com>.


use warnings;
use strict;

use Getopt::Long;
use Pod::Usage;

use File::Find;
use Text::Bibtex;

=head1 NAME

bibtex_to_paper - opens the paper corresponding to a bibtex key

=head1 SYNOPSIS

bibtex_to_paper [options] bibtexkey

 Options:
  --bibtex, -b bibtex file to look up key in
  --bibtex-cache, -c bibtex cache file
  --build-cache, -B build cache using bibtex files
  --pdf-dir pdf directory
  --pdfviewer, -p pdf viewer to use
  --debug, -d debugging level (Default 0)
  --help, -h display this help
  --man, -m display manual

=head1 OPTIONS

=over

=item B<--bibtex, -b>

Bibtex file to look key up in

=item B<--bibtex-cache, -c>

Bibtex cache file; rebuilt if bibtex file changes

=item B<--pdfviewer, -p>

PDF viewer to use; defaults to evince unless a .xoj exists, in which
case xournal is used.

=item B<--debug, -d>

Debug verbosity. (Default 0)

=item B<--help, -h>

Display brief usage information.

=item B<--man, -m>

Display this manual.

=back

=head1 EXAMPLES

bibtex_to_paper

=cut


use vars qw($DEBUG);

my %options = (debug           => 0,
               help            => 0,
               man             => 0,
              );

GetOptions(\%options,
           'build_cache|build-cache|B!',
           'bibtex|b=s',
           'bibtex_cache|bibtex-cache|c=s',
           'pdfviewer|p=s',
           'debug|d+','help|h|?','man|m');

pod2usage() if $options{help};
pod2usage({verbose=>2}) if $options{man};

$DEBUG = $options{debug};

my @USAGE_ERRORS;
if (not exists $options{bibtex} and
    not exists $options{bibtex_cache}) {
    push @USAGE_ERRORS,
        "You must give at least one of --bibtex".
        "or --bibtex-cache";
}

pod2usage(join("\n",@USAGE_ERRORS)) if @USAGE_ERRORS;

sub parse_bibtex_file {
    
}


sub initialize_database {
    my 
}

__END__