#!/usr/bin/perl -w

=head1 NAME

dh_auto_configure - automatically configure a package prior to building

=cut

use strict;
use Debian::Debhelper::Dh_Lib;

=head1 SYNOPSIS

B<dh_auto_configure> [S<I<debhelper options>>] [S<B<--> I<params>>]

=head1 DESCRIPTION

dh_auto_configure is a debhelper program that tries to automatically
configure a package prior to building. It looks for and runs a ./configure
script, Makefile.PL, or Build.PL. A standard set of parameters is
determined and passed to the program that is run. If no program to run is
found, dh_auto_configure will exit without doing anything.

This is intended to work for about 90% of packages. If it doesn't work,
you're encouraged to skip using dh_auto_configure at all, and just run
./configure or its equivilant manually.

=head1 OPTIONS

=over 4

=item B<--> I<params>

Pass "params" to the program that is run. These can be used to suppliment
or override the standard parameters that dh_auto_configure passes.

=back

=cut

init();

sub dpkg_architecture_value {
	my $var=shift;
	my $value=`dpkg-architecture -q$var 2>/dev/null` || error("dpkg-architecture failed");
	chomp $value;
	return $value;
}

sub sourcepackage {
	open (CONTROL, 'debian/control') ||
		error("cannot read debian/control: $!\n");
	while (<CONTROL>) {
		chomp;
		s/\s+$//;
		if (/^Source:\s*(.*)/) {
			close CONTROL;
			return $1;
		}
	}

	close CONTROL;
	error("could not find Source: line in control file.");
}

if (-x "configure") {
	# Standard set of options for configure.
	my @opts;
	push @opts, "--build=".dpkg_architecture_value("DEB_BUILD_GNU_TYPE");
	push @opts, "--prefix=/usr";
	push @opts, "--includedir=\${prefix}/include";
	push @opts, "--mandir=\${prefix}/share/man";
	push @opts, "--infodir=\${prefix}/share/info";
	push @opts, "--sysconfdir=/etc";
	push @opts, "--localstatedir=/var";
	push @opts, "--libexecdir=\${prefix}/lib/".sourcepackage();
	push @opts, "--disable-maintainer-mode";
	push @opts, "--disable-dependency-tracking";
	# Provide --host only if different from --build, as recommended in
	# autotools-dev README.Debian: When provided (even if equal) autotools
	# 2.52+ switches to cross-compiling mode.
	if (dpkg_architecture_value("DEB_BUILD_GNU_TYPE") ne dpkg_architecture_value("DEB_HOST_GNU_TYPE")) {
		push @opts, "--host=".dpkg_architecture_value("DEB_HOST_GNU_TYPE");
	}
	doit("./configure", @opts, @{$dh{U_PARAMS}});
}
elsif (-e "Makefile.PL") {
	# If set to a true value then MakeMaker's prompt function will
	# # always return the default without waiting for user input.
	$ENV{PERL_MM_USE_DEFAULT}=1;
	doit("perl", "Makefile.PL", "INSTALLDIRS=vendor", @{$dh{U_PARAMS}});
}
elsif (-e "Build.PL") {
	$ENV{PERL_MM_USE_DEFAULT}=1; # Module::Build can also use this.
	doit("perl", "Build.PL", "installdirs=vendor", @{$dh{U_PARAMS}});
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut