#! @PERL@
# $NetBSD: url2pkg.pl,v 1.17 2010/02/24 22:27:11 joerg Exp $
#

# Copyright (c) 2010 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Roland Illig.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
# This product includes software developed by the NetBSD
# Foundation, Inc. and its contributors.
# 4. Neither the name of The NetBSD Foundation nor the names of its
#    contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

use strict;
use warnings;

#
# Build-time Configuration.
#

my $make		= '@MAKE@';
my $perllibdir		= '@PERLLIBDIR@';

use constant true	=> 1;
use constant false	=> 0;

#
# Some helper subroutines.
#

sub run_editor($$) {
	my ($fname, $lineno) = @_;

	my $editor = $ENV{"PKGEDITOR"} || $ENV{"EDITOR"} || "vi";

	system { $editor } ($editor, "+${lineno}", $fname);
}

sub get_maintainer() {

	return $ENV{"PKGMAINTAINER"} || $ENV{"REPLYTO"} || "INSERT_YOUR_MAIL_ADDRESS_HERE";
}

sub print_section($$) {
	my ($f, $vars) = @_;

	if (scalar(@{$vars}) == 0) {
		return;
	}

	my $width = 0;
	foreach my $var (@{$vars}) {
		my $len = length($var->[0]);
		$width = ($len > $width) ? $len : $width;
	}

	foreach my $var (@{$vars}) {
		my $len = length($var->[0]) + 1;
		my $adjlen = (($width + 1 + 1) + 7) &-8;
		my $ntabs = (7 + $adjlen - $len) / 8;
		printf $f ("%s=%s%s\n", $var->[0], "\t" x $ntabs, $var->[1]);
	}
	printf $f ("\n");
}

#
# Introduction to the magic_* subroutines.
#
# The following routines are called after the distfiles have been
# downloaded and extracted. They may inspect the extracted files
# to automatically define some variables in the package Makefile.
#
# The following variables may be used in the magic_* subroutines:
# $distname contains the package name, including the version number.
# $abs_wrkdir is an absolute pathname to the working directory, which
# contains the extracted distfiles. $abs_wrksrc is the absolute pathname
# to a subdirectory of $abs_wrkdir, in which you can usually find the
# package-provided Makefiles or configure scripts.
#
# The following lists may be extended by the magic_* routines and
# will later appear in the package Makefile: @depends and @build_depends
# contain the dependencies of the package, in the form
# "package>=version". @includes is a list of pathnames relative to the
# package path. All these files will be included at the bottom of the
# Makefile. @build_vars is a list of [varname, value] items that contain
# variables that will be defined in the fourth paragraph of the package
# Makefile, where the build configuration takes place. The @extra_vars
# are similar to the @build_vars, but separated by an empty line in the
# Makefile. The @todo items are inserted below the second paragraph in
# the Makefile.
#

my ($distname, $abs_wrkdir, $abs_wrksrc);
my (@wrksrc_files, @wrksrc_dirs);
my (@depends, @build_depends, @includes, @build_vars, @extra_vars, @todo);
my ($pkgname);

#
# And now to the real magic_* subroutines.
#

sub magic_configure() {
	my $gnu_configure = false;

	open(CONF, "<", "${abs_wrksrc}/configure") or return;
	while (defined(my $line = <CONF>)) {
		if ($line =~ qr"autoconf|Free Software Foundation"i) {
			$gnu_configure = true;
			last;
		}
	}
	close(CONF);

	my $varname = ($gnu_configure ? "GNU_CONFIGURE" : "HAS_CONFIGURE");
	push(@build_vars, [$varname, "yes"]);
}

sub magic_gconf2_schemas() {
	my @gconf2_files = grep(/schemas(?:\.in.*)$/, @wrksrc_files);
	if (@gconf2_files) {
		foreach my $f (@gconf2_files) {
			if ($f =~ qr"(.*schemas)") {
				push(@extra_vars, ["GCONF_SCHEMAS+", $1]);
			}
		}
		push(@includes, "../../devel/GConf/schemas.mk");
	}
}

sub magic_libtool() {
	if (-f "${abs_wrksrc}/ltconfig" || -f "${abs_wrksrc}/ltmain.sh") {
		push(@build_vars, ["USE_LIBTOOL", "yes"]);
	}
	if (-d "${abs_wrksrc}/libltdl") {
		push(@includes, "../../devel/libltdl/convenience.mk");
	}
}

sub magic_perlmod() {
	if (-f "${abs_wrksrc}/Build.PL") {

		# It's a Module::Build module. Dependencies cannot yet be
		# extracted automatically.
		push(@todo, "Look for the dependencies in Build.PL.");

		push(@build_vars, ["PERL5_MODULE_TYPE", "Module::Build"]);

	} elsif (-f "${abs_wrksrc}/Makefile.PL") {
		open(DEPS, "cd ${abs_wrksrc} && perl -I${perllibdir} Makefile.PL |") or die;
		while (defined(my $dep = <DEPS>)) {
			chomp($dep);
			if ($dep =~ qr"\.\./\.\./") {
				# Many Perl modules write other things to
				# stdout, so filter them out.
				push(@depends, $dep);
			}
		}
		close(DEPS) or die;

	} else {
		return;
	}

	my $packlist = $distname;
	$packlist =~ s/-[0-9].*//;
	$packlist =~ s/-/\//g;
	push(@build_vars, ["PERL5_PACKLIST", "auto/${packlist}/.packlist"]);
	push(@includes, "../../lang/perl5/module.mk");
	$pkgname = "p5-\${DISTNAME}";
}

sub magic_pkg_config() {
	my @pkg_config_files = grep { /\.pc\.in$/ && ! /-uninstalled\.pc\.in$/ } @wrksrc_files;
	if (@pkg_config_files) {
		push(@build_vars, ["USE_TOOLS+", "pkg-config"]);
	}
	foreach my $f (@pkg_config_files) {
		push(@extra_vars, ["PKGCONFIG_OVERRIDE+", $f]);
	}
}

sub magic_po() {
	if (grep(/\.g?mo$/, @wrksrc_files)) {
		push(@build_vars, ["USE_PKGLOCALEDIR", "yes"]);
	}
}

sub magic_use_languages() {
	my @languages;

	grep(/\.(c|xs)$/, @wrksrc_files) and push(@languages, "c");
	grep(/\.(cpp|c\+\+|cxx|cc|C)$/, @wrksrc_files) and push(@languages, "c++");
	grep(/\.f$/, @wrksrc_files) and push(@languages, "fortran");

	my $use_languages = join(" ", @languages);
	if ($use_languages eq "") {
		$use_languages = "# none";
	}
	if ($use_languages ne "c") {
		push(@build_vars, ["USE_LANGUAGES", $use_languages]);
	}
}

#
# Subroutines for generating the initial package and adjusting it after
# the distfiles have been extracted.
#

sub generate_initial_package($) {
	my ($url) = @_;
	my ($found, $master_site);
	my ($master_sites, $distfile, $homepage, $dist_sufx, $category);

	$found = false;
	open(SITES, "<", "../../mk/fetch/sites.mk") or die;
	while (defined(my $line = <SITES>)) {
		chomp($line);

		if ($line =~ qr"^(MASTER_SITE_.*)\+=") {
			$master_site = $1;

		} elsif ($line =~ qr"^\t(.*?)(?:\s+\\)$") {
			my ($site) = ($1);

			if (index($url, $site) == 0) {
				$found = true;

				if ($url =~ qr"^\Q${site}\E(.+)/([^/]+)$") {
					my $subdir = $1;
					$distfile = $2;

					$master_sites = "\${${master_site}:=${subdir}/}";
					if ($master_site eq "MASTER_SITE_SOURCEFORGE") {
						$homepage = "http://${subdir}.sourceforge.net/";
					} elsif ($master_site eq "MASTER_SITE_GNU") {
						$homepage = "http://www.gnu.org/software/${subdir}/";
					} else {
						$homepage = substr($url, 0, -length($distfile));
					}
				} else {
					$master_sites = "\${${master_site}}";
				}
			}
		}
	}

	if (!$found) {
		if ($url =~ qr"^http://(?:pr)?downloads\.sourceforge\.net/([^/]*)/([^/?]+)(?:\?(?:download|use_mirror=.*))?$") {
			my $pkgbase = $1;
			$distfile = $2;

			$master_sites = "\${MASTER_SITE_SOURCEFORGE:=${pkgbase}/}";
			$homepage = "http://${pkgbase}.sourceforge.net/";
			$found = true;
		}
	}

	if (!$found) {
		if ($url =~ qr"^(.*/)(.*)$") {
			($master_sites, $distfile) = ($1, $2);
			$homepage = $master_sites;
		} else {
			die("$0: ERROR: Invalid URL: ${url}\n");
		}
	}

	if ($distfile =~ qr"^(.*)(\.tgz|\.tar\.Z|\.tar\.gz|\.tar\.bz2)$") {
		($distname, $dist_sufx) = ($1, $2);
	} elsif ($distfile =~ qr"^(.*)(\.[^.]+)$") {
		($distname, $dist_sufx) = ($1, $2);
	} else {
		($distname, $dist_sufx) = ($distfile, "# none");
	}

	# ignore errors.
	rename("Makefile", "Makefile-url2pkg.bak");

	`pwd` =~ qr".*/([^/]+)/[^/]+$" or die;
	$category = $1;

	open(MF, ">", "Makefile") or die;
	print MF ("# \$Net" . "BSD\$\n");
	print MF ("#\n");
	print MF ("\n");
	print_section(*MF, [
		["DISTNAME", $distname],
		["CATEGORIES", $category],
		["MASTER_SITES", $master_sites],
		($dist_sufx ne ".tar.gz"
		? ["EXTRACT_SUFX", $dist_sufx]
		: ())
	]);
	print_section(*MF, [
		["MAINTAINER", get_maintainer()],
		["HOMEPAGE", $homepage],
		["COMMENT", "TODO: Short description of the package"],
		["#LICENSE", "# TODO: (see mk/license.mk)"],
	]);
	print_section(*MF, [
		["PKG_DESTDIR_SUPPORT", "user-destdir"],
	]);
	print MF ("# url2pkg-marker (please do not remove this line.)\n");
	print MF (".include \"../../mk/bsd.pkg.mk\"\n");
	close(MF) or die;

	open(PLIST, ">", "PLIST") or die;
	print PLIST ("\@comment \$Net" . "BSD\$\n");
	close(PLIST) or die;

	open(DESCR, ">", "DESCR") or die;
	close(DESCR) or die;

	run_editor("Makefile", 5);

	print ("url2pkg> Running \"make distinfo\" ...\n");
	(system { $make } ($make, "distinfo")) == 0 or die;
	
	print ("url2pkg> Running \"make extract\" ...\n");
	(system { $make } ($make, "extract")) == 0 or die;
}

sub adjust_package_from_extracted_distfiles()
{
	my ($seen_marker);

	chomp($abs_wrkdir = `${make} show-var VARNAME=WRKDIR`);

	#
	# Determine the value of WRKSRC.
	#
	my @files = ();
	opendir(WRKDIR, $abs_wrkdir) or die;
	while (defined(my $f = readdir(WRKDIR))) {
		next if $f =~ qr"^\.";
		push(@files, $f);
	}
	closedir(WRKDIR);
	if (@files == 1) {
		if ($files[0] ne $distname) {
			push(@build_vars, ["WRKSRC", "\${WRKDIR}/$files[0]"]);
		}		
		$abs_wrksrc = "${abs_wrkdir}/$files[0]";
	} else {
		push(@build_vars, ["WRKSRC", "\${WRKDIR}" .
		    ((@files > 1) ? " # More than one possibility -- please check manually." : "")]);
		$abs_wrksrc = $abs_wrkdir;
	}

	chomp(@wrksrc_files = `cd "${abs_wrksrc}" && find * -type f`);
	chomp(@wrksrc_dirs = `cd "${abs_wrksrc}" && find * -type d`);

	magic_configure();
	magic_gconf2_schemas();
	magic_libtool();
	magic_perlmod();
	magic_pkg_config();
	magic_po();
	magic_use_languages();

	print("url2pkg> Adjusting the Makefile.\n");

	open(MF1, "<", "Makefile") or die;
	open(MF2, ">", "Makefile-url2pkg.new") or die;

	# Copy the user-edited part of the Makefile.
	while (defined(my $line = <MF1>)) {
		if ($line =~ qr"^# url2pkg-marker\b") {
			$seen_marker = true;
			last;
		}
		print MF2 ($line);

		# Note: This is not elegant, but works.
		if (defined($pkgname) && $line =~ qr"^DISTNAME=(\t+)") {
			print MF2 ("PKGNAME=$1${pkgname}\n");
		}
	}

	if (@todo) {
		foreach my $todo (@todo) {
			print MF2 ("# TODO: ${todo}\n");
		}
		print MF2 ("\n");
	}

	my @depend_vars;
	foreach my $bd (@build_depends) {
		push(@depend_vars, ["BUILD_DEPENDS+", $bd]);
	}
	foreach my $d (@depends) {
		push(@depend_vars, ["DEPENDS+", $d]);
	}
	print_section(*MF2, \@depend_vars);

	print_section(*MF2, \@build_vars);
	print_section(*MF2, \@extra_vars);

	foreach my $f (@includes) {
		print MF2 (".include \"${f}\"\n");
	}

	# Copy the rest of the user-edited part of the Makefile.
	while (defined(my $line = <MF1>)) {
		print MF2 ($line);
	}

	close(MF1);
	close(MF2) or die;
	if ($seen_marker) {
		rename("Makefile-url2pkg.new", "Makefile") or die;
	} else {
		unlink("Makefile-url2pkg.new");
		die("$0: ERROR: didn't find the url2pkg marker in the file.\n");
	}
		
}

sub main() {
	my $url;

	if (!-f "../../mk/bsd.pkg.mk") {
		die("$0 must be run from a package directory (.../pkgsrc/category/package).");
	}

	my @extract_cookie = <w*/.extract_done>;
	if (scalar(@extract_cookie) == 0) {
		if (scalar(@ARGV) == 0) {
			print("URL: ");
			# Pressing Ctrl-D is considered equivalent to
			# aborting the process.
			if (!defined($url = <STDIN>)) {
				print("\n");
				print("No URL given -- aborting.\n");
				exit(0);
			}
		} else {
			$url = shift(@ARGV);
		}

		generate_initial_package($url);
	} else {
		chomp($distname = `${make} show-var VARNAME=DISTNAME`);
	}

	adjust_package_from_extracted_distfiles();

	print("\n");
	print("Remember to correct CATEGORIES, HOMEPAGE, COMMENT, and DESCR when you're done!\n");
	print("\n");
	print("Good luck! (See pkgsrc/doc/pkgsrc.txt for some more help :-)\n");
}

main();