use ExtUtils::MakeMaker;
# See lib/ExtUtils/MakeMaker.pm for details of how to influence
# the contents of the Makefile that is written.
eval { require File::Spec; };
my $HAVE_FILE_SPEC = !$@;
my $version_diff = 0; # we'll have to die if this becomes true

if ($HAVE_FILE_SPEC) {
  $version_from = File::Spec->catfile(qw(lib Devel SawAmpersand.pm));
  my $version_set_manually = 1; # not by SVN

  if ($ARGV[0] && $ARGV[0] eq "--setversion") {
    die "Your perl is a bit dated[$]].\nDo not make a release with it\n" if $] < 5.008;
    die "Your MakeMaker is a bit dated[$ExtUtils::MakeMaker::VERSION].\nDo not make a release with it\n"
        if $ExtUtils::MakeMaker::VERSION < 6.3004;
    die "Your MakeMaker doesn't do the sign woodoo" unless
        MM->can("signature_target");
    shift @ARGV;
    my $st;
    open $st, "svn st -u|" or die;
    my $dirty = 0;
    while (<$st>) {
      next if /^\?/;
      next if /^Head revision:/;
      next if /^Status against revision:/;
      print;
      $dirty++;
    }
    close $st;
    die "Not everything checked in or out?" if $dirty;

    # $re parses the upper boundary of the output of svnversion
    my $re;
    eval q{ $re = qr/(?:\d+:)?(\d+)[SM]*$/; };
    die $@ if $@; # old perl
    my($sv_dot)  = `svnversion .`             =~ $re;
    my($sv_from) = `svn st -u -v $version_from`  =~ /^.{8}\s*(?:\d+)\s*(\d+)/;
    die "Could not determine sv_from or sv_dot"
        unless $sv_from > 0 && $sv_dot > 0;
    if ($version_set_manually) {
      # we must control that the VERSION in CPAN.pm is the same as in the Makefile
      unshift @INC, "blib/arch", "blib/lib";
      require $version_from;
      open my $fh, "make the-release-name|" or die;
      my $have_version;
      while (<$fh>) {
        next unless /^version\s+([\d\._]+)/;
        $have_version = eval $1;
      }
      die "could not determine current version from Makefile" unless $have_version;
      eval q{
      no warnings "numeric";
      if ($Devel::SawAmpersand::VERSION != $have_version) {
        warn "Not equal: Devel::SawAmpersand::VERSION[$Devel::SawAmpersand::VERSION] Makefile version[$have_version]";
        $version_diff = 1;
      }
};
      die $@ if $@;
    } else {
      if ($sv_dot > $sv_from) {
        warn "setting some property to make a checkin of this file possible";
        0==system(svn => "propset",
                  "cpan:release",
                  "after_$sv_dot",
                  $version_from) or die;
        warn "checking in to get the version up to the bleading edge";
        0==system(svn => "ci",
                  "-m",
                  "Property set for release after_$sv_dot",
                  $version_from) or die;
        # will have to die after Makefile is rewritten:
        $version_diff = 1;
      }
    }
    exit unless $version_diff;
  }
}

my @sign = (MM->can("signature_target") ? (SIGN => 1) : ());

WriteMakefile(
              'NAME'	=> 'Devel::SawAmpersand',
              'VERSION_FROM' => 'lib/Devel/SawAmpersand.pm', # finds $VERSION
              ($ExtUtils::MakeMaker::VERSION >= 6.3002 ?
               (LICENSE      => "perl") : (),
              ),
              'LIBS'	=> [''],   # e.g., '-lm' 
              'DEFINE'	=> '',     # e.g., '-DHAVE_SOMETHING' 
              'INC'	=> '',     # e.g., '-I/usr/include/other' 
              'dist'      => {
                              COMPRESS => 'gzip -9',
                              DIST_DEFAULT => join(" ",
                                                   "META.yml",
                                                   "setversion",
                                                   "README",
                                                   "all",
                                                   "tardist",
                                                  ),
                             },
              @sign,
             );

if ($version_diff){
  die "
==> I had to update some \$VERSIONs <==
==> Your Makefile has been rebuilt. <==
==> Please rerun the make command.  <==
";
}

package MY;

sub postamble {
  my @m;
  push @m, q{
the-release-name :
	$(NOECHO) $(ECHO) 'version ' $(VERSION)
	$(NOECHO) $(ECHO) 'release-name ' $(DISTVNAME).tar$(SUFFIX)

release ::
	/usr/bin/perl -I$$HOME/sources/CPAN/SVN/release-lib -S release $(DISTVNAME).tar$(SUFFIX)
	rm -rf $(DISTVNAME)
	svn cp -m 'This is $(VERSION)' https://franz.ak.mind.de/public-svn/Devel-SawAmpersand/trunk https://franz.ak.mind.de/public-svn/Devel-SawAmpersand/tags/$(VERSION)

META.yml: metafile
	$(CP) $(DISTVNAME)/META.yml  ./META.yml

setversion:
	$(PERL) Makefile.PL --setversion

};
  join "", @m;
}

sub dist_test {
  return q{
# if we depend on $(DISTVNAME).tar$(SUFFIX), then the rest of the
# Makefile breaks our intent to NOT remake dist
disttest :
	rm -rf $(DISTVNAME)
	tar xvzf $(DISTVNAME).tar$(SUFFIX)
	cd $(DISTVNAME) && $(ABSPERLRUN) Makefile.PL
	cd $(DISTVNAME) && $(MAKE) $(PASTHRU)
	cd $(DISTVNAME) && $(MAKE) test $(PASTHRU)

distdir ::
	touch $(DISTVNAME)/SIGNATURE && $(CP) $(DISTVNAME)/SIGNATURE ./SIGNATURE
	$(CP) $(DISTVNAME)/META.yml  ./META.yml
	$(CP) $(DISTVNAME)/MANIFEST  ./MANIFEST

}
}

sub distdir {
  my $self = shift;
  my $out = $self->SUPER::distdir;
  $out =~ s/distdir :/distdir ::/g;
  return $out;
}

# dist_dir was the name in very old MakeMaker as of 5.005_04
sub dist_dir {
  my $self = shift;
  my $out = $self->SUPER::dist_dir;
  $out =~ s/distdir :/distdir ::/g;
  return $out;
}