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#!/usr/bin/perl

# Copyright (C) 2019 Sean Whitton
#
# This file is part of pandoc-citeproc-preamble.
#
# pandoc-citeproc-preamble 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 3 of the
# License, or (at your option) any later version.
#
# pandoc-citeproc-preamble 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 pandoc-citeproc-preamble.  If not, see
# <http://www.gnu.org/licenses/>.

use 5.028;
use strict;
use warnings;

use File::Spec::Functions qw(rel2abs);
use File::Basename qw(dirname);

our $output = "output.tex";
our $pcp = "../dist/build/pandoc-citeproc-preamble/pandoc-citeproc-preamble";

chdir(dirname(rel2abs(__FILE__)));
die "need to build before testing\n" unless -e $pcp;
unlink $output if -e $output;

print "testing with " . (`pandoc --version`)[0];
system "pandoc -s --filter pandoc-citeproc --bibliography=test.bib"
  . " --filter $pcp -M citeproc-preamble=../examples/default.latex"
  . " test.mdwn -f markdown -o $output";

# simple finite state machine to check that the preamble was inserted
# in the right place
open my $fh, '<', $output;
my $preamble = 0;
while (<$fh>) {
    if ($_ eq "\\section*{References}\n") {
        if ($preamble) {
            die "preamble inserted twice!\n";
        } else {
            $preamble = 1;
        }
    } elsif (/A Book/) {
        if ($preamble) {
            say "success: citeproc preamble inserted as expected";
            exit 0;
        } else {
            die "references inserted before/without preamble!\n";
        }
    }
}
if ($preamble) {
    die "preamble without references!\n";
} else {
    die "neither preamble nor references found!\n";
}