#!/usr/bin/perl
# $OpenBSD: libtool,v 1.37 2012/07/11 08:33:45 espie Exp $

# Copyright (c) 2007-2010 Steven Mestdagh <steven@openbsd.org>
# Copyright (c) 2012 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

use strict;
use warnings;
use feature qw(say switch state);
use Cwd qw(getcwd);
use File::Glob ':glob';

use LT::Trace;
use LT::Exec;
use LT::Util;
use LT::Getopt;

$SIG{__DIE__} = sub {
	require Carp;

	my $_ = pop @_;
	s/(.*)( at .*? line .*?\n$)/$1/s;
	push @_, $_;
	die &Carp::longmess;
};

package LT::OSConfig;

use Config;
use LT::Util;

my @picflags =qw(-fPIC -DPIC);

sub new
{
	    my $class = shift;
	    # XXX: incomplete
	    my $self = bless {
		machine_arch => $Config{ARCH},
		ltdir => $ltdir,
		version => $version,
		objdir => $ltdir, 
		build_old_libs => 'yes',
		pic_flags => join(' ', @picflags),
	    }, $class;
	    ($self->{gnu_arch} = $self->{machine_arch}) =~ s/amd64/x86_64/;

	    if (grep { $_ eq $self->{machine_arch} } qw(m88k vax)) {
		$self->{build_libtool_libs} = 'yes';
		$self->{noshared} = 1;
	    } else {
		$self->{build_libtool_libs} = 'no';
		$self->{noshared} = 0;
	    }

	    return $self;
}

sub noshared
{
	my $self = shift;
	return $self->{noshared};
}

sub host
{
	my $self = shift;
	if (!defined $self->{osversion}) {
		chomp($self->{osversion} = `uname -r`);
	}
	return "$self->{gnu_arch}-unknown-openbsd$self->{osversion}";
}

# XXX
sub picflags
{
	my $self = shift;
	return \@picflags;
}

sub sharedflag
{
	return '-shared';
}

sub version
{
	my $self = shift;
	return $self->{version};
}

sub dump
{
	my $self = shift;
	for my $key (sort keys %$self) {
		say "$key=$self->{$key}";
	}
}

package LT::Mode;
use LT::Util;

sub new
{
	my ($class, $origin) = @_;
	bless {origin => $origin }, $class;
}

sub load_subclass
{
	my ($self, $class) = @_;
	local $SIG{__DIE__} = 'DEFAULT';
	eval "require $class;";
	if ($@) {
		unless ($@ =~ m/^Can't locate .* in \@INC/) {
			say STDERR $@;
			exit 1;
		}
	}
}

my $mode_maker = { compile => 'LT::Mode::Compile', 
	clean => 'LT::Mode::Clean',
	execute => 'LT::Mode::Execute',
	finish => 'LT::Mode::Finish',
	install => 'LT::Mode::Install',
	link => 'LT::Mode::Link',
	uninstall => 'LT::Mode::Uninstall' };

sub factory
{
	my ($class, $mode, $origin) = @_;
	my $s = $mode_maker->{$mode};
	if ($s) {
		$class->load_subclass($s);
		return $s->new($origin);
	} else {
		shortdie "Mode=$mode not implemented yet.\n";
	}
}

sub help
{
}

sub help_all
{
	my $class = shift;
	for my $s (sort values %$mode_maker) {
		$class->load_subclass($s);
		$s->help;
	}
}

package LT::Mode::Empty;
our @ISA = qw(LT::Mode);
sub run
{
	exit 0;
}

package LT::Mode::Clean;
our @ISA = qw(LT::Mode::Empty);
sub help
{
	print <<"EOH";

Usage: $0 --mode=clean RM [RM-Option]... FILE...
has not been implemented.
It should remove files from the build directory.
EOH
}

package LT::Mode::Execute;
our @ISA = qw(LT::Mode);
sub run
{
	my ($class, $ltprog, $gp, $ltconfig) = @_;
	# XXX check whether this is right
	LT::Exec->silent_run;
	LT::Exec->execute(@$ltprog, @main::ARGV);
}

sub help
{
	print <<"EOH";

Usage: $0 --mode=execute COMMAND  [ARGS...]
Run a program after setting correct library path.
EOH
}


package LT::Mode::Finish;
our @ISA = qw(LT::Mode::Empty);
sub help
{
	print <<"EOH";

Usage: $0 --mode=finish [LIBDIR}...
Complete the installation of libtool libraries.
Not needed for our usage.
EOH
}

package LT::Mode::Uninstall;
our @ISA = qw(LT::Mode::Empty);
sub help
{
	print <<"EOH";

Usage: $0 --mode=uninstall RM [RM-OPTION]... FILE...
has not been implemented
It should remove libraries from an installation directory.
EOH
}

package LT::Options;
use LT::Util;
our @ISA = qw(LT::Getopt);

my @valid_modes = qw(compile clean execute finish install link uninstall);

my @known_tags = qw(disable-shared disable-static CC CXX F77 FC GO GCJ RC);

sub new
{
	my $class = shift;
	my $o = bless {}, $class;
	return $o;
}

sub add_tag
{
	my ($self, $value) = @_;
	if ($value =~ m/[^\-\w,\/]/) {
		shortdie "invalid tag name: $value"; 
		exit 1;
	} 
	if (grep {$value eq $_} @known_tags) {
		$self->{tags}{$value} = 1;
	} else {
		say STDERR "ignoring unknown tag: $value";
	}
}

sub has_tag
{
	my ($self, $tag) = @_;
	return defined $self->{tags}{$tag};
}

sub is_abreviated_mode
{
	my ($self, $arg) = @_;
	return undef if !$arg;
	for my $m (@valid_modes) {
		next if length $arg > length $m;
		if ($arg eq substr($m, 0, length $arg)) {
			return LT::Mode->factory($m, $arg);
		}
	}
	return undef;
}

# XXX this should always fail if we are libtool2 !
# try to guess libtool mode when it is not specified
sub guess_implicit_mode
{
	my ($self, $ltprog) = @_;
	my $m;
	for my $a (@$ltprog) {
	   if ($a =~ m/(install([.-]sh)?|cp)$/) {
		$m = LT::Mode->factory('install', "implicit $a");
	   } elsif ($a =~ m/cc|c\+\+/) {	# XXX improve test
		if (grep { $_ eq '-c' } @ARGV) {
			$m = LT::Mode->factory('compile', "implicit");
		} else {
			$m = LT::Mode->factory('link',  "implicit");
		}
	   }
	}
	return $m;
}

sub valid_modes
{
	my $self = shift;
	return join(' ', @valid_modes);
}

package main;

my $ltconfig = LT::OSConfig->new;
my $cwd = getcwd();
my $mode;
my $verbose = 1;
my $help = 0;


# XXX compat game to satisfy both libtool 1 and libtool 2
unless ($ARGV[0] eq 'install' && $ARGV[1] =~ m/^-[bcCdpSsBfgmo]/) {
	if ($mode = LT::Options->is_abreviated_mode($ARGV[0])) {
		shift @ARGV;
	}
}

# just to be clear:
# when building a library:
# 	* -R libdir records libdir in dependency_libs
# 	* -rpath is the path where the (shared) library will be installed
# when building a program:
# 	* both -R libdir and -rpath libdir add libdir to the run-time path
# -Wl,-rpath,libdir will bypass libtool.

my $gp = LT::Options->new;
$gp->handle_options(
    '-config' => \&config,
    '-debug|x' => sub { 
		    LT::Trace->set(1); 
		    LT::Exec->verbose_run;
		},
    '-dry-run|-dryrun|n' => sub { LT::Exec->dry_run; },
    '-features' => sub {
		say "host: ", $ltconfig->host;
		say "enable shared libraries" unless $ltconfig->noshared;
		say "enable static libraries";
		exit 0;
	    },
    '-finish' => sub { $mode = LT::Mode->factory('finish', '--finish'); },
    '-help|?|h' => sub { $help = 1; },
    '-help-all' => sub { basic_help(); LT::Mode->help_all; exit 0; },
    '-mode=' => sub {
		    $mode = LT::Mode->factory($_[2], "--mode=$_[2]");
		},
    '-quiet|-silent|-no-verbose' => sub { $verbose = 0; },
    '-verbose|-no-silent|-no-quiet|v' => sub {$verbose = 1;},
    '-tag=' => sub { $gp->add_tag($_[2]); },
    '-version' => sub { 
		    say "libtool (not (GNU libtool)) ", $ltconfig->version;
		    exit 0;
		},
    '-no-warning|-no-warn' => sub {},
    # ignored
    '-preserve-dup-deps',
    '-dlopen=|dlopen=@',
);

if ($help) {
	basic_help();
	if ($mode) {
		$mode->help;
	}
	exit 0;
}
if ($verbose) {
	LT::Exec->verbose_run;
}

# what are we going to run (cc, c++, ...)
my $ltprog = [];
# deal with multi-arg ltprog
tsay {"ARGV = \"@ARGV\""};
while (@ARGV) {
	# just read arguments until the next option...
	if ($ARGV[0] =~ m/^\-/) { last; }
	# XXX improve checks
	if ($ARGV[0] =~ m/^\S+\.la/) { last; }
	my $arg = shift @ARGV;
	push @$ltprog, $arg;
	tsay {"arg = \"$arg\""};
	# if the current argument is an install program, stop immediately
	if ($arg =~ /cp$/) { last; }
	if ($arg =~ /install([-.]sh)?$/) { last; }
}
tsay {"ltprog = \"@$ltprog\""};

# XXX compat game to satisfy both libtool 1 and libtool 2
# let libtool install work as both libtool 1 and libtool 2
if (@$ltprog == 0 && defined $mode && $mode->{origin} eq 'install') {
	$ltprog = [ 'install' ];
}

if (@$ltprog == 0) { die "No libtool command given.\n" .
			 "Use `libtool --help' for more information.\n" };
# make ltprog a list of elements without whitespace (prevent exec errors)
my @tmp_ltprog = @$ltprog;
@$ltprog = ();
for my $el (@tmp_ltprog) {
	my @parts = split /\s+/, $el;
	push @$ltprog, @parts;
}

if (!defined $mode) {
	$mode = $gp->guess_implicit_mode($ltprog);
	tsay {"implicit mode: ", $mode->{origin}} if $mode;
}

if (!defined $mode) {
	shortdie "no explicit mode, couldn't figure out implicit mode\n";
}

if (!$mode->isa("LT::Mode::Execute")) {
	if ($gp->dlopen)  {
		shortdie "Error: -dlopen FILE  in generic libtool options is an error in non execute mode";
	}
}

# from here, options may be intermixed with arguments

$mode->run($ltprog, $gp, $ltconfig);

if (LT::Exec->performed == 0) {
	die "No commands to execute.\n"
}

###########################################################################

sub basic_help
{
	print <<EOF
Usage: $0 [options]
--config - print configuration
--debug - turn on debugging output
--dry-run - don't do anything, only show what would be done
--help - this message
--mode=MODE - use operation mode MODE
--quiet - do not print informational messages
--silent - same as `--quiet'
--tag=TAG - specify a configuration variable TAG
--version - print version of libtool
EOF
;
}

sub config
{
	$ltconfig->dump;
	exit 0;
}

