#!/usr/bin/perl
#
# $Cambridge: exim/release-process/scripts/mk_exim_release.pl,v 1.1 2010/06/03 12:00:38 nm4 Exp $
#
use strict;
use warnings;
use Carp;
use File::Copy;
use File::Spec;
use File::Path;
use File::Temp;
use FindBin;
use Getopt::Long;
use Pod::Usage;

my $debug   = 0;
my $verbose = 0;

# ------------------------------------------------------------------

sub get_and_check_version {
    my $release = shift;
    my $context = shift;

    # make sure this looks like a real release version
    # which should (currently) be 4.xx or 4.xx_RCx
    unless ( $release =~ /^(4\.\d\d(?:_RC\d+)?)$/ ) {
        croak "The given version number does not look right - $release";
    }
    my $full_release  = $1;              # untainted here...
    my $trunc_release = $full_release;
    $trunc_release =~ s/^(4\.\d\d)(?:_RC\d+)?$/$1/;

    $context->{release}  = $full_release;
    $context->{trelease} = $trunc_release;
}

# ------------------------------------------------------------------

sub build_tag {
    my $context = shift;

    # The CVS tag consists of exim-$version where $version
    # is the version number with . replaced with _
    my $modversion = $context->{release};
    $modversion =~ tr/0-9RC/_/cs;

    return sprintf( 'exim-%s', $modversion );
}

# ------------------------------------------------------------------

sub deal_with_working_directory {
    my $context = shift;
    my $delete  = shift;

    # Set default directory
    $context->{directory} ||= File::Spec->rel2abs( sprintf( 'exim-packaging-%s', $context->{release} ) );
    my $directory = $context->{directory};

    # ensure the working directory is not in place
    if ( -d $directory ) {
        if ($delete) {
            print "Deleting existing $directory\n" if ($verbose);
            rmtree( $directory, { verbose => $debug } );
        }
        if ( -d $directory ) {
            croak "Working directory $directory exists";
        }
    }

    mkpath( $context->{directory}, { verbose => ( $verbose || $debug ) } );
}

# ------------------------------------------------------------------

sub export_git_tree {
    my $context = shift;

    # build git command
    my $archive_file = sprintf( '%s/%s-%s.tar', $context->{tmp_dir}, $context->{pkgname}, $context->{release} );
    $context->{tmp_archive_file} = $archive_file;
    my @cmd = ( 'git', 'archive', '--format=tar', "--output=$archive_file", $context->{tag} );

    # run git command
    print( "Running: ", join( ' ', @cmd ), "\n" ) if ($verbose);
    system(@cmd) == 0 || croak "Export failed";
}

# ------------------------------------------------------------------

sub unpack_tree {
    my $context = shift;

    die "Cannot see archive file\n" unless ( -f $context->{tmp_archive_file} );
    my @cmd = ( 'tar', 'xf', $context->{tmp_archive_file} );

    # run  command
    print( "Running: ", join( ' ', @cmd ), "\n" ) if ($verbose);
    system(@cmd) == 0 || croak "Unpack failed";
}

# ------------------------------------------------------------------

sub build_html_documentation {
    my $context = shift;

    my $genpath   = $context->{webgen_base} . '/script/gen.pl';
    my $templates = $context->{webgen_base} . '/templates';
    my $dir       = 'html';
    mkdir($dir);

    my @cmd = (
        $genpath,                     '--spec',    'doc/doc-docbook/spec.xml', '--filter',
        'doc/doc-docbook/filter.xml', '--latest',  $context->{trelease},       '--tmpl',
        $templates,                   '--docroot', $dir
    );

    print "Executing ", join( ' ', @cmd ), "\n";
    system(@cmd);

    # move directory into right place
    rename( sprintf( 'html/exim-html-%s', $context->{trelease} ), sprintf( 'exim-html-%s', $context->{release} ) );
}

# ------------------------------------------------------------------

sub build_documentation {
    my $context = shift;

    system("cd doc/doc-docbook && ./OS-Fixups && make everything") == 0
      || croak "Doc build failed";

    build_html_documentation($context);
}

# ------------------------------------------------------------------

sub move_text_docs_into_pkg {
    my $context = shift;

    my $old_docdir = 'doc/doc-docbook';
    my $new_docdir = File::Spec->catdir( $context->{pkgdir}, 'doc' );
    mkpath( $new_docdir, { verbose => ( $verbose || $debug ) } );

    # move generated documents from docbook stuff
    foreach my $file (qw/exim.8 spec.txt filter.txt/) {
        move( File::Spec->catfile( $old_docdir, $file ), File::Spec->catfile( $new_docdir, $file ) );
    }

    # move text documents across
    foreach my $file ( glob( File::Spec->catfile( 'doc/doc-txt', '*' ) ) ) {

        # skip a few we dont want
        my $fn = ( File::Spec->splitpath($file) )[2];
        next
          if ( ( $fn eq 'ABOUT' )
            || ( $fn eq 'ChangeLog.0' )
            || ( $fn eq 'test-harness.txt' ) );
        move( $file, File::Spec->catfile( $new_docdir, $fn ) );
    }
}

# ------------------------------------------------------------------

sub build_pspdfinfo_directory {
    my $context = shift;

    ##foreach my $format (qw/pdf postscript texinfo info/) {
    foreach my $format (qw/pdf postscript/) {
        my $dir = sprintf( 'exim-%s-%s', $format, $context->{release} );
        my $target = File::Spec->catdir( $dir, 'doc' );
        mkpath( $target, { verbose => ( $verbose || $debug ) } );

        # move documents across
        foreach my $file (
            glob(
                File::Spec->catfile(
                    'doc/doc-docbook',
                    (
                        ( $format eq 'postscript' )
                        ? '*.ps'
                        : ( '*.' . $format )
                    )
                )
            )
          )
        {
            my $fn = ( File::Spec->splitpath($file) )[2];
            move( $file, File::Spec->catfile( $target, $fn ) );
        }
    }
}

# ------------------------------------------------------------------

sub build_main_package_directory {
    my $context = shift;

    # initially we move the exim-src directory to the new directory name
    my $pkgdir = sprintf( 'exim-%s', $context->{release} );
    $context->{pkgdir} = $pkgdir;
    rename( 'src', $pkgdir ) || croak "Rename of src dir failed - $!";

    # add Local subdirectory
    my $target = File::Spec->catdir( $pkgdir, 'Local' );
    mkpath( $target, { verbose => ( $verbose || $debug ) } );

    # now add the text docs
    move_text_docs_into_pkg($context);
}

# ------------------------------------------------------------------

sub build_package_directories {
    my $context = shift;

    build_main_package_directory($context);
    build_pspdfinfo_directory($context);
}

# ------------------------------------------------------------------

sub create_tar_files {
    my $context = shift;

    foreach my $dir ( glob( 'exim*-' . $context->{release} ) ) {
        system("tar cfz ${dir}.tar.gz ${dir}");
        system("tar cfj ${dir}.tar.bz2 ${dir}");
    }
}

# ------------------------------------------------------------------
{
    my $man;
    my $help;
    my $context = {
        pkgname     => 'exim',
        orig_dir    => File::Spec->curdir(),
        tmp_dir     => File::Temp->newdir(),
        webgen_base => "$FindBin::Bin/../../../exim-website",
    };
    my $delete;
    ##$ENV{'PATH'} = '/opt/local/bin:' . $ENV{'PATH'};

    unless (
        GetOptions(
            'directory=s'   => \$context->{directory},
            'webgen_base=s' => \$context->{webgen_base},
            'verbose!'      => \$verbose,
            'debug!'        => \$debug,
            'help|?'        => \$help,
            'man!'          => \$man,
            'delete!'       => \$delete,
        )
      )
    {
        pod2usage( -exitval => 1, -verbose => 0 );
    }
    pod2usage(0) if $help;
    pod2usage( -verbose => 2 ) if $man;

    get_and_check_version( shift, $context );
    $context->{tag} = build_tag($context);
    deal_with_working_directory( $context, $delete );
    export_git_tree($context);
    chdir( $context->{directory} ) || die;
    unpack_tree($context);
    build_documentation($context);
    build_package_directories($context);
    create_tar_files($context);
}

1;

__END__

=head1 NAME

mk_exim_release.pl - Build an exim release

=head1 SYNOPSIS

mk_exim_release.pl [options] version

 Options:
   --debug             force debug mode (SQL Trace)
   --verbose           force verbose mode
   --help              display this help and exits
   --man               displays man page
   --directory=dir     dir to package
   --delete            Delete packaging directory at start

=head1 OPTIONS

=over 4

=item B<--debug>

Forces debug mode cause all SQL statements generated by L<DBIx::Class>
to be output.

=item B<--verbose>

Force verbose mode - currently this has no effect

=item B<--help>

Display help and exits

=item B<--man>

Display man page

=back

=head1 DESCRIPTION

Builds an exim release.

Starting in a populated git repo that has already been tagged for
release, build docs, build packages etc.

Parameter is the version number to build as - ie 4.72 4.72RC1 etc

=head1 AUTHOR

Nigel Metheringham <Nigel.Metheringham@dev.intechnology.co.uk>

=head1 COPYRIGHT

Copyright 2010 Exim Maintainers. All rights reserved.

=cut