#
# Construct file to build scons during development.
# (Kind of ironic that we're using the classic Perl Cons
# to build its Python child...)
#
$project = 'scons';

Default qw( . );

#
# An internal "whereis" routine to figure out if we have a
# given program available.  Put it in the "cons::" package
# so subsidiary Conscript files can get at it easily, too.
#
use Config;
sub cons::whereis {
    my $file = shift;
    foreach my $dir (split(/$Config{path_sep}/, $ENV{PATH})) {
	$f = File::Spec->catfile($dir, $file);
	return $f if -x $f;
    }
    return undef
}

#
# We let the presence or absence of various utilities determine
# whether or not we bother to build certain pieces of things.
# This will allow people to still do SCons work even if they
# don't have Aegis or RPM installed, for example.
#
$aegis = cons::whereis('aegis');
$aesub = cons::whereis('aesub');
$rpm = cons::whereis('rpm');
$jw = cons::whereis('jw');

#
# Now grab the information that we "build" into the files (using sed).
#
chomp($date = $ARG{date});
if (! $date) {
    ($sec,$min,$hour,$mday,$mon,$year) = localtime(time);
    $year += 1900;
    $date = sprintf("%4d/%02d/%02d %02d:%02d:%02d",
		    $year, $mon, $mday, $hour, $min, $sec);
}

$developer = $ARG{developer} || $ENV{USERNAME} || $ENV{LOGNAME} || $ENV{USER};

$revision = $ARG{version};
chomp($revision = `$aesub '\$version' 2>/dev/null`) if $aesub && ! $revision;
$revision = '0.01' if ! $revision;

$change = $ARG{change};
chomp($change = `$aesub '\$change' 2>/dev/null`) if $aesub && ! $change;

@arr = split(/\./, $revision);
@arr = ($arr[0], map {length($_) == 1 ? "0$_" : $_} @arr[1 .. $#arr]);
$revision = join('.', @arr);
pop @arr if $#arr >= 2;
map {s/^[CD]//, s/^0*(\d\d)$/$1/} @arr;
$version = join('.', @arr);

chomp($python_ver = `python -c "import sys; print sys.version[0:3]"`);

chomp($platform = `python -c "from distutils.util import get_platform; print get_platform()"`);

if ($platform eq "win32") {
    $archsuffix = "zip"
} else {
    $archsuffix = "tar.gz"
}


use Cwd;
$test_dir = File::Spec->catfile(cwd, "build", "test");

%package_name = (
    'script'	=> $project,
    'engine'	=> "$project-pylib",
);

$test_bin_dir = File::Spec->catfile($test_dir, "bin");
$test_lib_dir = File::Spec->catfile($test_dir,
				    "lib",
				    "python${python_ver}",
				    "site-packages"),

%install_dir = (
    'script'	=> $test_bin_dir,
    'engine'	=> $test_lib_dir,
);

$env = new cons( ENV => {
			  AEGIS_PROJECT => $ENV{AEGIS_PROJECT},
			  PATH => $ENV{PATH},
			},

		 TEST_BIN_DIR	=> $test_bin_dir,
		 TEST_LIB_DIR	=> $test_lib_dir,

		 DATE		=> $date,
		 DEVELOPER	=> $developer,
		 REVISION	=> $revision,
		 VERSION	=> $version,

		 SED		=> 'sed',
				   # Use %(-%) around the date so date
				   # changes don't cause rebuilds.
		 SEDFLAGS	=> " %( -e 's+__DATE__+%DATE+' %)" .
				   " -e 's+__DEVELOPER__+%DEVELOPER+'" .
				   " -e 's+__FILE__+%<+'" .
				   " -e 's+__REVISION__+%REVISION+'" .
				   " -e 's+__VERSION__+%VERSION+'",
		 SEDCOM		=> "%SED %SEDFLAGS %< > %>",
		);

my @src_deps;

my %src_file = (
    'scons'	=> 'scons.py',
);

for $dir ('script', 'engine') {

    my $pkg = $package_name{$dir};
    my $install = $install_dir{$dir};

    my $build = "build/$dir";
    my $src = "src/$dir";

    my @files;
    chomp(@files = `cat src/$dir/MANIFEST`);

    #
    # Run everything in the MANIFEST through the sed command we concocted.
    #
    foreach $b (@files) {
	my $s = $src_file{$b} || $b;
	$env->Command("$build/$b", "$src/$s", "%SEDCOM");
    }

    #
    # Use the Python distutils to generate the packages.
    #
    my $archive = "$build/dist/$pkg-$version.$archsuffix";

    push(@src_deps, $archive);

    my @setup_args = ('bdist sdist');

    my @targets = (
	"$build/dist/$pkg-$version.$platform.$archsuffix",
	$archive,
    );

    if ($rpm) {
	push(@setup_args, 'bdist_rpm');

	# XXX "$build/build/bdist.$platform/rpm/SOURCES/$pkg-$version.$archsuffix",
	# XXX "$build/build/bdist.$platform/rpm/SPECS/$pkg.spec",
	push(@targets,
	    "$build/dist/$pkg-$version-1.src.rpm",
	    "$build/dist/$pkg-$version-1.noarch.rpm",
	);
    };

    # We can get away with calling setup.py using a directory path
    # like this because we put a preamble in it that will chdir()
    # to the directory in which setup.py exists.
    $env->Command([@targets],
	      map("$build/$_", @files),
	      qq(rm -rf $build/build $build/dist/*
		 python $build/setup.py @setup_args)
	     );

    $env->Depends([@targets], "$build/MANIFEST");

    $env->Install("build/dist", @targets);

    #
    # Unpack the archive created by the distutils into build/unpack.
    #
    my $unpack = "build/unpack";

    my @unpack_files = map("$unpack/$pkg-$version/$_", @files);

    # We'd like to replace the last three lines with the following:
    #
    #	tar zxf %< -C $unpack
    #
    # but that gives heartburn to Cygwin's tar, so work around it
    # with separate zcat-tar-rm commands.
    Command $env [@unpack_files], $archive, qq(
	rm -rf $unpack/$pkg-$version
	zcat %< > .temp
	tar xf .temp -C $unpack
	rm -f .temp
    );

    #
    # Run setup.py in the unpacked subdirectory to "install" everything
    # into our build/test subdirectory.  Auxiliary modules that we need
    # (TestCmd.py, TestSCons.py, unittest.py) will be copied in by
    # etc/Conscript.  The runtest.py script will set PYTHONPATH so that
    # the tests only look under build/test.  This makes sure that our
    # tests pass with what we really packaged, not because of something
    # hanging around in the development directory.
    #
    my %seen;
    map($seen{$_}++, "MANIFEST", "setup.py");
    @test_files = map(File::Spec->catfile($install, $_),
    			grep(!$seen{$_}++ &&
			     ($_ =~ /\.py$/ || $src_file{$_}), @files));

    # We can get away with calling setup.py using a directory path
    # like this because we put a preamble in it that will chdir()
    # to the directory in which setup.py exists.
    Command $env [@test_files], @unpack_files, qq(
	rm -rf $install
	python $unpack/$pkg-$version/setup.py install --prefix=$test_dir
    );
}

Export qw( env );

Build "etc/Conscript";

#
# Documentation.
#
if ($jw) {
    Link 'build/doc' => 'doc';

    Build 'build/doc/Conscript';
}

#
# If we're running in the actual Aegis project, pack up a complete
# source archive from the project files and files in the change,
# so we can share it with helpful developers who don't use Aegis.
#
# First, lie and say that we've seen any files removed by this
# change, so they don't get added to the source files list
# that goes into the archive.
#

if ($change) {
    foreach (`aegis -list -unf -c $change cf 2>/dev/null`) {
	$seen{"$1\n"}++ if /^(?:source|test) remove(?:\s.*)+\s(\S+)$/;
    }

    eval '@src_files = grep(! $seen{$_}++,
		    `aegis -list -terse pf 2>/dev/null`,
		    `aegis -list -terse cf 2>/dev/null`)';

    @src_files = grep($_ !~ /(\.aeignore|\.consign)$/, @src_files);

    if (@src_files) {
	chomp(@src_files);

	foreach $file (@src_files) {
	    $env->Command("build/$project-src/$file", $file, "%SEDCOM");
	}

	$env->Command("build/dist/$project-src-$version.tar.gz",
    		      @src_deps,
		      map("build/$project-src/$_", @src_files),
		      qq(
		rm -rf build/$project-src-$version
		cp -r build/$project-src build/$project-src-$version
		find build/$project-src-$version -name .consign -exec rm {} \\;
		tar zcf %> -C build $project-src-$version
	));
    }
}