#!/usr/bin/env perl
#
# This program creates a source distribution of qpdf.  For details,
# see README-maintainer.
#

require 5.008;
use warnings;
use strict;
use File::Basename;
use Cwd;
use Cwd 'abs_path';
use IO::File;
use File::Path qw(rmtree make_path);

my $whoami = basename($0);

my $tmp = $ENV{'TMPDIR'} || '/tmp';
my $keep_tmp = 0;
my $ci_mode = 0;
my $version = undef;
foreach my $arg (@ARGV)
{
    if ($arg eq '--keep-tmp')
    {
        $keep_tmp = 1;
    }
    elsif ($arg eq '--ci')
    {
        $ci_mode = 1;
    }
    elsif (! defined $version)
    {
        $version = $arg;
    }
    else
    {
	usage();
    }
}

if ($ci_mode && (! defined $version))
{
    $version = get_version_from_cmake();
}

usage() unless defined $version;
usage() unless $version =~ m/^(\d+\.\d+(?:\.(a|b|rc)?\d+)?)$/;
my $distname = "qpdf-$version";
my $tmpdir = "${tmp}/$distname";
if ((-d $tmpdir) && (! $keep_tmp))
{
    rmtree($tmpdir);
}
make_path($tmp);
run("git archive --prefix=qpdf-$version/ HEAD . | (cd $tmp; tar xf -)");
cd($tmpdir);

# Check versions
my $cmakeversion = get_version_from_cmake();
my $code_version = get_version_from_source();

my $version_error = 0;
if ($version ne $cmakeversion)
{
    print "$whoami: cmake version = $cmakeversion\n";
    $version_error = 1;
}
if ($version ne $code_version)
{
    print "$whoami: QPDF.cc version = $code_version\n";
    $version_error = 1;
}
if ($version_error)
{
    die "$whoami: version numbers are not consistent\n";
}

cd($tmp);
run("tar czvf $distname.tar.gz-candidate $distname");
my $distfile = ($ci_mode ? "$distname-ci.tar.gz" : "$distname.tar.gz");
rename "$distname.tar.gz-candidate", $distfile or die;

if (! $keep_tmp)
{
    rmtree($tmpdir);
}

print "
Source distribution created as ${tmp}/$distfile
If this is a release, don't forget to tag the version control system and
make a backup of the release tar file.

";

sub get_version_from_cmake
{
    my $fh = safe_open("CMakeLists.txt");
    my $cmake_version = 'unknown';
    my $saw_project = 0;
    while (<$fh>)
    {
        if (m/project\(qpdf/)
        {
            $saw_project = 1;
        }
        elsif ($saw_project && m/VERSION (\S+)$/)
        {
            $cmake_version = $1;
            last;
        }
    }
    $fh->close();
    $cmake_version;
}

sub get_version_from_source
{
    my $fh = safe_open("include/qpdf/DLL.h");
    my $code_version = 'unknown';
    my $major = '';
    my $minor = '';
    my $patch = '';
    while (<$fh>)
    {
        if (m/QPDF_MAJOR_VERSION (\d+)/)
        {
            $major = $1;
        }
        elsif (m/QPDF_MINOR_VERSION (\d+)/)
        {
            $minor = $1;
        }
        elsif (m/QPDF_PATCH_VERSION (\d+)/)
        {
            $patch = $1;
        }
        elsif (m/QPDF_VERSION \"([^\"]+)\"/)
        {
            $code_version = $1;
        }
    }
    my $t = sprintf("%s.%s.%s", $major, $minor, $patch);
    if ($t ne $code_version)
    {
        die "$whoami: version is inconsistent in DLL.h:" .
            " $t vs $code_version\n";
    }

    $fh->close();
    $code_version;
}

sub safe_open
{
    my $file = shift;
    my $fh = new IO::File("<$file") or die "$whoami: can't open $file: $!";
    $fh;
}

sub run
{
    my $cmd = shift;
    system($cmd) == 0 or die "$whoami: $cmd failed\n";
}

sub cd
{
    my $dir = shift;
    chdir($dir) or die;
}

sub usage
{
    die "
Usage: $whoami [--keep-tmp] {--ci|version}

$whoami creates ${tmp}/qpdf-<version> and deletes it when done. With
--keep-tmp, the directory is kept. This can be useful for debugging
the release process.

";
}