1 files changed, 147 insertions, 0 deletions
diff --git a/Debian/Debhelper/Dh_Buildsystems.pm b/Debian/Debhelper/Dh_Buildsystems.pm
new file mode 100644
index 00000000..afb03dd7
--- /dev/null
+++ b/Debian/Debhelper/Dh_Buildsystems.pm
@@ -0,0 +1,147 @@
+# A module for loading and managing debhelper buildsystem plugins.
+# This module is intended to be used by all dh_auto_* helper commands.
+#
+# Copyright: © 2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Dh_Buildsystems;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib;
+
+use base 'Exporter';
+our @EXPORT=qw(&buildsystems_init &buildsystems_do &load_buildsystem);
+
+# Historical order must be kept for backwards compatibility. New
+# buildsystems MUST be added to the END of the list.
+our @BUILDSYSTEMS = (
+    "autoconf",
+    "perl_makemaker",
+    "makefile",
+    "python_distutils",
+    "perl_build",
+    "cmake",
+);
+
+my $opt_buildsys;
+my $opt_builddir;
+my $opt_list;
+
+sub create_buildsystem_instance {
+	my $system=shift;
+	my %bsopts=@_;
+	my $module = "Debian::Debhelper::Buildsystem::$system";
+
+	eval "use $module";
+	if ($@) {
+		error("unable to load buildsystem class '$system': $@");
+	}
+
+	if (!exists $bsopts{builddir} && defined $opt_builddir) {
+		$bsopts{builddir} = ($opt_builddir eq "") ? undef : $opt_builddir;
+	}
+	return $module->new(%bsopts);
+}
+
+sub load_buildsystem {
+	my ($action, $system)=@_;
+	if (defined $system) {
+		my $inst = create_buildsystem_instance($system);
+		return $inst;
+	}
+	else {
+		# Try to determine build system automatically
+		for $system (@BUILDSYSTEMS) {
+			my $inst = create_buildsystem_instance($system, build_action=>$action);
+			if ($inst->is_buildable()) {
+				return $inst;
+			}
+		}
+	}
+	return;
+}
+
+sub buildsystems_init {
+	my %args=@_;
+
+	# TODO: Not documented in the manual pages yet.
+	# Initialize options from environment variables
+	if (exists $ENV{DH_AUTO_BUILDDIRECTORY}) {
+		$opt_builddir = $ENV{DH_AUTO_BUILDDIRECTORY};
+	}
+	if (exists $ENV{DH_AUTO_BUILDSYSTEM}) {
+		$opt_buildsys = $ENV{DH_AUTO_BUILDSYSTEM};
+	}
+
+	# Available command line options
+	my %options = (
+	    "b:s" => \$opt_builddir,
+	    "builddirectory:s" => \$opt_builddir,
+
+	    "m=s" => \$opt_buildsys,
+	    "buildsystem=s" => \$opt_buildsys,
+
+	    "l" => \$opt_list,
+	    "--list" => \$opt_list,
+	);
+	map { $args{options}{$_} = $options{$_} } keys(%options);
+	Debian::Debhelper::Dh_Lib::init(%args);
+}
+
+sub buildsystems_list {
+	my $action=shift;
+
+	# List buildsystems (including auto and specified status)
+	my ($auto, $specified);
+	for my $system (@BUILDSYSTEMS) {
+		my $inst = create_buildsystem_instance($system, build_action => undef);
+		my $is_specified = defined $opt_buildsys && $opt_buildsys eq $inst->NAME();
+		if (! defined $specified && defined $opt_buildsys && $opt_buildsys eq $inst->NAME()) {
+			$specified = $inst->NAME();
+		}
+		elsif (! defined $auto && $inst->check_auto_buildable($action)) {
+			$auto = $inst->NAME();
+		}
+		printf("%s - %s\n", $inst->NAME(), $inst->DESCRIPTION());
+	}
+	# List a specified 3rd party buildsystem too.
+	if (! defined $specified && defined $opt_buildsys) {
+		my $inst = create_buildsystem_instance($opt_buildsys, build_action => undef);
+		printf("%s - %s.\n", $inst->NAME(), $inst->DESCRIPTION());
+		$specified = $inst->NAME();
+	}
+	print "\n";
+	print "Auto-selected: $auto\n" if defined $auto;
+	print "Specified: $specified\n" if defined $specified;
+	print "No system auto-selected or specified\n"
+		if ! defined $auto && ! defined $specified;
+}
+
+sub buildsystems_do {
+	my $action=shift;
+
+	if (!defined $action) {
+		$action = basename($0);
+		$action =~ s/^dh_auto_//;
+	}
+
+	if (grep(/^\Q$action\E$/, qw{configure build test install clean}) == 0) {
+		error("unrecognized build action: " . $action);
+	}
+
+	if ($opt_list) {
+		buildsystems_list($action);
+		exit 0;
+	}
+
+	my $buildsystem = load_buildsystem($action, $opt_buildsys);
+	if (defined $buildsystem) {
+		$buildsystem->pre_action($action);
+		$buildsystem->$action(@_, @{$dh{U_PARAMS}});
+		$buildsystem->post_action($action);
+	}
+	return 0;
+}
+
+1;