#!/usr/bin/env perl

=pod

=head1 NAME

Makefile.PL - Configure pugs build

=head1 SYNOPSIS

perl Makefile.PL [options]

Options:

    --precompile-prelude        Force prelude to be precompiled
    --no-precompile-prelude     Force prelude not to be precompiled
    --help                      Print documentation (build system overview)

=head1 DESCRIPTION

Build System Overview

 - Makefile.PL calls get_pugs_config() in inc/Module/Install/Pugs.pm which
   then calls util/PugsConfig.pm to get configuration data printed with
   ./pugs -V
 - Makefile.PL calls GHC to compile Setup.hs to ./Setup.exe.
 - Makefile.PL writes a Makefile that will call util/build_pugs.pl
   upon "make".
 - build_pugs.pl writes a Pugs.cabal file based on the flags given in
   the Makefile.
 - build_pugs.pl calls ./Setup.exe.
 - Setup.exe builds dist/build/libHSPugs-6.XXX.YYY.a and returns to
   build_pugs.pl.
 - build_pugs.pl calls GHC to build ./pugs.exe
   (by simply linking the freshly built libHSPugs package with src/Main.hs).

=cut

use 5.006;
use strict;
use warnings;
use Config;
use Cwd qw(abs_path cwd);
use File::Spec;
use File::Copy;
use File::Basename;
use FindBin;
use ExtUtils::Embed;
BEGIN { chdir $FindBin::RealBin };
use inc::Module::Install;
use lib 'inc';
use PugsBuild::Config;
use Carp;
use Getopt::Long;
use Pod::Usage;
use POSIX qw/uname/;

our %options;
GetOptions \%options, qw( precompile-prelude! help ) or pod2usage(2);

pod2usage(-verbose => 2) if $options{'help'};

if ( $options{'precompile-prelude'} ) {
    $PugsBuild::Config::Conf->{precompile_prelude} = $options{'precompile-prelude'}
}

# Win32/CygWin GHC appears to be more memory hungry than its
# *nix counterpart, causing it to bail part-way through builds.
# This value will be used only if 'ghc_heap_size' in config.yml
# is not defined.

use constant WIN32_GHC_HEAPSIZE => "348m";

# Special case for migration - remove old version of Syck
unlink 'src/Data/Yaml/Syck.hs' if -e 'src/Data/Yaml/Syck.hs';

my @warn;
my $pugs = "pugs$Config{_exe}";
my ($fs) = ($Config{sitelib} =~ /([\/\\])/)
       or die "Can't determine file_sep";
my $thispugs = ".${fs}pugs$Config{_exe}";
my $version_h = "src/Pugs/pugs_version.h";
my $config_h = "src/Pugs/pugs_config.h";
my @srcdirs  = grep {-d} glob("src"), glob("src/*"), glob("src/*/*"), glob("src/*/*/*");

# On Win32, svn may create '_svn' dirs rather than '.svn'.  Hide them manually.
# Details: http://svn.collab.net/repos/svn/trunk/notes/asp-dot-net-hack.txt
@srcdirs = grep {! m|\b_svn\b|} @srcdirs if $ENV{SVN_ASP_DOT_NET_HACK};

my @hsfiles  = map {glob "$_/[A-Z]*.hs"} @srcdirs;
push @hsfiles, qw<src/Pugs/Config.hs src/Pugs/CodeGen/PIR/Prelude.hs>;
my @hppfiles = map {my $x=$_; $x=~s/\.hs$/.hpp/; $x} @hsfiles;

warn_cygwin     ();

for my $var (qw( PERL5LIB PERLLIB )) {
    if (grep { m{^(?:\.?[\\/]+)*lib$} } split(/\Q$Config{path_sep}\E/, ($ENV{$var} || next))) {
        die <<"EOD";
*** The "$var" environment variable contains a naked 'lib',
    which will disrupt the Pugs build process.

    Please remove it and run Makefile.PL again.
EOD
    }
    last; # PERLLIB is ignored when PERL5LIB is in place
}

print "*** Probing configuration (please ignore any warnings)...\n\n";

name            ('Perl6-Pugs');
version_from    ('lib/Perl6/Pugs.pm');
abstract_from   ('lib/Perl6/Pugs.pm');
author          ('Audrey Tang <cpan@audreyt.org>');
license         ('perl');
install_script  ($pugs);
install_script  ('script/pugscc');
install_script  ('util/prove6');
recommends      ('Perl6::Bible');
recommends      ('Inline');
recommends      ('Filter::Simple');
recommends      ('LWP::Simple');
recommends      ('LWP');
build_requires  ('ExtUtils::MakeMaker' => 6.15);
build_requires  ('FindBin');
build_requires  ('File::Path');
include         ('Module::Install::Makefile::Name');
include         ('Module::Install::Makefile::Version');
build_subdirs   (map fixpaths($_), grep {
                   -f "$_/Makefile.PL" && not -l "$_/Makefile.PL"
                 } glob("ext/*"), glob("docs/*")
                );

my $version = version();
$version .= 0 until length($version) >= length('0.123456');
$version =~ s{6\.(\d{3})(\d{3})?}{join '.', 6, int($1), int($2||0)}e;
version($version);

makemaker_args  (
    test => { TESTS => "`perl t/spec/fudgeall pugs t/*/*.t t/*/*/*.t`" }, # , "perl5/*/t/*.t" },
    MAN1PODS => {},
);

if (my $prefix = PugsBuild::Config->lookup('install_dir')) {
    makemaker_args(PREFIX => $prefix);
}

clean_files     (map fixpaths($_),
    $version_h, $config_h,
    (map {"$_/*.hpp"} @srcdirs),
    "pugs$Config{_exe}", "pil$Config{_exe}",
    "src/gen_prelude$Config{_exe}",
    "Setup$Config{_exe}", "util/ghc-pkg-wrapper$Config{_exe}",
    "util/runcompiler$Config{_exe}", qw(
    src/Pugs/pugs_config.h src/Pugs/Config.hs blib6 dist
    src/Pugs/Prelude.hs src/Pugs/CodeGen/PIR/Prelude.hs test.log
    src/Pugs/Embed/Parrot.hs src/Pugs/Embed/Parrot_hsc.*
    src/Pugs/*/*_stub.*
    util/ghc-pkg-wrapper.hs util/ghc-pkg-wrapper.hi util/ghc-pkg-wrapper.o
    util/runcompiler.hs util/runcompiler.hi util/runcompiler.o
    temp-ex* unlink-test* Prelude Pugs.cabal Setup.hi Setup.o
    .setup-config .installed-pkg-config
    temp-test.*.*-out tempfile.*.* create_this_file create_this_file2
    third-party/*/*.hi third-party/*/*.o
    third-party/*/dist
    ),
    object_files("src/Pugs", "src/Pugs/*", "src/Pugs/*/*"),
    object_files("src/MO", "src/MO/*", "src/MO/*/*"),
);

set_postamble   ();
no_index        (
    directory =>
        qw< inc debian modules perl5 ext script util docs examples src >
);
sign            (1);
WritePugs       (5);

print(('=' x 78), "\n\n");

print @warn;

print << ".";
*** Enter '$Config{make}' to build Pugs.  If compilation is too slow,
    consider using '$Config{make} soon' instead.

.

################################################################################
sub object_files  {
    map { ("$_/*.o", "$_/*.hi") } @_;
}

sub try_package {
    my ($ghc, $ghcpkg, $code) = @_;
    my @packages = qw(-hide-all-packages -package base);
    push(@packages, "-package $ghcpkg");
    if (not try_compile
        ($code , $ghc, @packages),
    ) {
        # We are missing mtl,network,time,whatever somehow,
        # likely because GHC 6.6's extra pkg is not there
        die <<"EOD";
*** Could not load the "$ghcpkg" package in your GHC installation.

    This is likely because the "extralibs" of GHC 6.6 was not built along
    with the base GHC distribution.

    To install extra libraries, extract both "-src" and "-src-extralibs"
    distributions from http://haskell.org/ghc/download_ghc_66.html in the
    same directory, then cd into ghc-6.6/ and build GHC from there.
    In Ubuntu Feisty/debian type
     "sudo aptitude install libghc6-$ghcpkg-dev"
EOD
    }
}


sub set_postamble {
    my @srcfiles = map { glob("$_/*.*hs") } @srcdirs;
    push @srcfiles, map { glob("$_/*.*hs-boot") } @srcdirs;
    push @srcfiles, map { map { substr($_, 0, -1) } glob("$_/*.*hsc") } @srcdirs;

    my ($ghc, $ghc_version, $ghc_flags, $ghc_pkg) = assert_ghc();
    my $hsc2hs = $ENV{HSC2HS};
    my $setup = File::Spec->catfile(".", "Setup$Config{_exe}");
    my $ghc_wrapper = File::Spec->catfile(".", "util", "runcompiler$Config{_exe}");
    my $ghc_pkg_wrapper = File::Spec->catfile(".", "util", "ghc-pkg-wrapper$Config{_exe}");
    my $config_path = File::Spec->catfile(cwd(), 'third-party', 'installed', 'packages.conf');

    if (!$hsc2hs) {
        $hsc2hs = $ghc;
        $hsc2hs =~ s{(.*)ghc}{$1hsc2hs};
    }

    preprocess(
            File::Spec->catfile('util', 'runcompiler.hs.in'),
            File::Spec->catfile('util', 'runcompiler.hs'),
            CONFIG_PATH => $config_path,
            GHC => $ghc,
            GHC_PKG => $ghc_pkg,
    );
    preprocess(
            File::Spec->catfile('util', 'ghc-pkg-wrapper.hs.in'),
            File::Spec->catfile('util', 'ghc-pkg-wrapper.hs'),
            CONFIG_PATH => $config_path,
            GHC => $ghc,
            GHC_PKG => $ghc_pkg,
    );

    # set up install path for third-party modules
    mkdir File::Spec->catdir('third-party', 'installed');

    compile_hs($ghc, 'Setup', $setup);
    compile_hs($ghc, File::Spec->catfile('util', 'ghc-pkg-wrapper'), $ghc_pkg_wrapper);
    compile_hs($ghc, File::Spec->catfile('util', 'runcompiler'), $ghc_wrapper);

    # Add GHC to PATH
    local $ENV{PATH} = dirname($ghc) . $Config{path_sep} . $ENV{PATH};


    try_package($ghc,
                'mtl',
                "import Control.Monad.RWS\n"
                . "main = let (x, (), ()) = runRWS (return ()) () () in return x\n"
                );
    try_package($ghc,
                'network',
                "import Network.BSD\n"
                . "main = let x = defaultProtocol in return x\n"
                );
    try_package($ghc,
                'time',
                "import Data.Time\n"
                . "main = return 1\n"
               );

    #
    # We probably need to promote this to a config.yml + autodetect
    # thing, but until it's done, put the condition here at least and
    # don't hardcode it into the postamble.
    #
    # Note that the -fdebugging flag only existed in GHC trunk builds
    # around May 2007, and would not be present either before or afterwards.
    # (In the newer builds it's enabled by default and supports a much more
    # comprehensive feature set, including single-stepping and tracing.)
    #
    my $ghci_debugging =
            (defined $ENV{PUGS_GHCI_DEBUGGING} ? $ENV{PUGS_GHCI_DEBUGGING} : 1)
        ? '-fdebugging' : '';

    if ($ghc_version =~ /^(\d+\.\d+)/) {
        $ghci_debugging = '' if $1 <= 6.6 or $1 >= 6.8;
    }

    $ghc = $ghc_wrapper;
    $ghc_pkg = $ghc_pkg_wrapper;

    my $heap;

    $heap = PugsBuild::Config->lookup('ghc_heap_size') || $heap;
    $ghc_flags .= " +RTS -M$heap -RTS" if $heap;
    # $ghc_flags .= ' -dcore-lint';
    # $ghc_flags .= " -keep-tmp-files";

    if ($ENV{PUGS_EMBED} and $ENV{PUGS_EMBED} =~ /\bhaskell\b/i) {
        if (has_ghc_package('plugins')
            and  try_compile("import System.Eval\n"
                            ."main :: IO ()\n"
                            .'main = (eval_ "return ()" [] [] [] [] :: IO (Either [String] (Maybe ()))) >> return ()', $ghc, '-package', 'plugins')) {
            $ghc_flags .= ' -package plugins -DPUGS_HAVE_HSPLUGINS ';
        }
        else {
            push @warn, << '.';
*** Inline Haskell support disabled.  If you want dynamic loading
    of haskell modules, please install the hs-plugins library:
        http://www.cse.unsw.edu.au/~dons/hs-plugins/
    Remember to "make register" after "make install" for hs-plugins!

.
        }
    }

    if (has_ghc_package('readline')
        and  try_compile("import System.Console.Readline\n"
                        ."main :: IO ()\n"
                        ."main = do\n"
                        ."  setCatchSignals False\n"
                        ."  setCatchSigwinch False\n"
                        .'  _ <- readline "" '."\n"
                        .'  return ()', $ghc)) {
      $ghc_flags .= ' -DPUGS_HAVE_READLINE '; # -package readline';
    }
    else {
      push @warn, << '.';
*** Readline support disabled.  If you want readline support,
    please install the GNU readline library.

.
    }

    my $ghc_output = ''; # "-o pugs$Config{_exe} src/Main.hs";
    my $hasktags = $ENV{HASKTAGS} || 'hasktags';

    # map a bunch of .c files to a bunch of expected .o files
    my $o = sub { map { substr($_, 0, -1) . 'o' } @_ };

    my @prereqs = ();
    my @derived_srcfiles = qw< src/Pugs/Embed/Parrot.hs src/Pugs/pugs_config.h src/Pugs/pugs_version.h src/Pugs/Config.hs src/Pugs/Prelude.hs src/Pugs/CodeGen/PIR/Prelude.hs >;

    my $embed_flags = "-I" . cwd();
    my $hsc2hs_flags = "";
    my $ccdlflags = "";

    # [-!]perl5 does not work with the \bFLAG\b convention used in this file.
    # It should be removed, or the convention, and code, fixed.
    # Went in 2006-08-30.  Depreciated 2006-09-11.
    if ($ENV{PUGS_EMBED} and $ENV{PUGS_EMBED} =~ /[-!]perl5\b/i) {
        push @warn,  << '.';
*** PUGS_EMBED flags "-perl5" and "!perl5" are depreciated and buggy.
    Please use "noperl5" instead.

.
    }
    if (!$ENV{PUGS_EMBED} or $ENV{PUGS_EMBED} !~ /(?:[-!]|\bno)perl5\b/i) {
        $ENV{PUGS_EMBED} .= " perl5 ";
        #push @prereqs, "src/perl5/p5embed.o"; # XXX
        # $ghc_output .= " src/perl5/p5embed.o ";
        $embed_flags .= " -DPUGS_HAVE_PERL5 -isrc/perl5 ";
        my $flags = "$Config{ccflags} $Config{ccdlflags} ";
        if ($flags =~ /\S/) {
            $flags =~ s{([\\"'])}{\\$1}g;
            my @flags = grep { length $_ } split /\s+/, $flags;
            if ($^O eq 'MSWin32') {
                if ($Config{libperl} =~ /lib(\w+)\.a/) {
                    $embed_flags .= " -optl-l$1 ";
                }
                elsif (defined &Win32::BuildNumber) {
                    # We are on ActivePerl -- Kluge massively!

                    no warnings 'once';
                    our %MY_CONFIG = %Config;
                    *Config = *MY_CONFIG;
                    *Config::Config = *MY_CONFIG;
                    *ExtUtils::MM_Win32::Config = *MY_CONFIG;
                    *ExtUtils::MM_Unix::Config = *MY_CONFIG;

                    $Config{ccflags} =~ s/-libpath:"?(.*?)"? //g;
                    $Config{ccdlflags} =~ s/-libpath:"?(.*?)"? //g;
                    $Config{lddlflags} =~ s/-libpath:"?(.*?)"? //g;
                    $Config{ldflags} =~ s/-libpath:"?(.*?)"? //g or die "ldflags: $Config{ldflags} does not contain -libpath:";

                    my $lib = "$1/$Config{libperl}";
                    $embed_flags .= " -optl\"$lib\" ";

                    $flags = "$Config{ccflags} $Config{ccdlflags}";
                    $flags =~ s{([\\"'])}{\\$1}g;
                    @flags = grep { length $_ } split /\s+/, $flags;
                }
                else {
                    warn "Unrecognized libperl shared library: $Config{libperl}, proceeding anyway...\n";
                }

                $ccdlflags .= (/^-[DIL]/ ? ' -optc' : ' -optl') . qq["$_" ] for @flags;
                $embed_flags .= " -optc-Ddirent=DIRENT";
            }
            else {
                $embed_flags .= " -optc$_" for grep length, split(/\s+/, ccopts());
                $embed_flags .= " -optl$_" for grep length, split(/\s+/, ldopts());

            }

            $embed_flags .= " $_" for grep { /-[DIL]/ } split(/\s+/, ccopts());
            $embed_flags .= " $_" for grep { /-[DIL]/ } split(/\s+/, ldopts());

            if ($Config{osname} eq 'cygwin') {
                my $cygpath = sub {
                    my $path = `cygpath -m @_`;
                    chomp $path;
                    return $path;
                };
                $embed_flags =~ s{(/usr/\S+)}{$cygpath->($1)}eg;
                $embed_flags =~ s{/cygdrive/(\w)/}{$1:/}g;
                #warn "** Cygwin embedding flags: embed_flags\n";
            }
        }
    }
    else {
        push @warn, << '.';
*** Perl 5 embedding disabled.  If you want Perl 5 support, please set the
    PUGS_EMBED environment variable to not contain "noperl5".

.
    }

    if ($ENV{PUGS_EMBED} and $ENV{PUGS_EMBED} =~ /\bparrot\b/i and $Config{cc} eq 'cl') {
        push @warn, << '.';
*** Parrot linking not supported with MSVC.  Parrot linking will be disabled.

.
        $ENV{PUGS_EMBED} =~ s/\bparrot\b//g;
    }

    # Respect CC setting
    my $cc = $ENV{CC} || 'gcc';
    $ghc_flags .= " -pgmc $cc " unless $cc eq 'gcc';

    if ($Config{cf_by} eq 'Debian Project' and $ENV{PUGS_EMBED} and $ENV{PUGS_EMBED} =~ /\bperl5\b/i) {
        # Is it safe to remove 'Debian Project' above, to test on all platforms?
        my $need_path = 1;
        my $libperlpath = '';
        my $libperl = $Config{libperl};
        foreach my $path (split(/\s/, $Config{libpth} . ' ' . $Config{libsdirs})) {
            if (-e "$path/libperl.so") {
                $need_path = 0;
                last;
            } elsif (-e "$path/$libperl") {
                $libperlpath ||= $path;
            }
        }
        if ($need_path) {
            my $message = '';
            $message .= qq[        * Symlink $libperlpath/$libperl to libperl.so\n] if ($libperlpath and $libperl);
            $message .= qq[        * Install libperl-dev package\n] if ($Config{cf_by} eq 'Debian Project');
            die <<EOD;
*** Could not find libperl.so in: $Config{libpth} $Config{libsdirs}
    Solutions include:
        * Add noperl5 to PUGS_EMBED
$message
EOD
        }
    }

    if ($ENV{PUGS_EMBED} and $ENV{PUGS_EMBED} =~ /\bparrot\b/i) {
        my $base = $ENV{PARROT_PATH};
        my $parrot_config = which('parrot-config.imc') || which('parrot-config.pir') || which('parrot-config') || '';
        if (!$base && -e $parrot_config) {
            $base = (File::Spec->splitpath($parrot_config))[1];
        }
        if (!$base) {
            $parrot_config = which('parrot-config') || '';
            $base = (File::Spec->splitpath($parrot_config))[1] if -e $parrot_config;
        }
        if (!$base and -d File::Spec->catdir(File::Spec->updir, 'parrot')) {
            $base = abs_path(File::Spec->catdir(File::Spec->updir, 'parrot'));
        }
        if (!$base and -d File::Spec->catdir(File::Spec->updir, 'parrot-trunk')) {
            $base = abs_path(File::Spec->catdir(File::Spec->updir, 'parrot-trunk'));
        }

        my $temp = File::Spec->catfile($base, 'parrot-config.imc');
        if (!$parrot_config && -e $temp) {
          $parrot_config = $temp;
        }

        $temp = File::Spec->catfile($base, 'parrot-config.pir');
        if (!$parrot_config && -e $temp) {
          $parrot_config = $temp;
        }

        $temp = File::Spec->catfile($base, 'parrot-config');
        if (!$parrot_config && -e $temp) {
          $parrot_config = $temp;
        }

        $base =~ s/bin\/*$//;

        (-d $base and -e $parrot_config)
            or die "*** Please set \$ENV{PARROT_PATH} to the base path with a built parrot tree.\n";
        my $ldflags = parrot_config($base, $parrot_config, 'ldflags');
        my $libs = parrot_config($base, $parrot_config, 'libs');
        my $icuflags = parrot_config($base, $parrot_config, 'icu_shared');
        my $include_path = parrot_config($base, $parrot_config, 'prefix') . parrot_config($base, $parrot_config, 'inc');
        my $rpath_blib = parrot_config($base, $parrot_config, 'rpath_blib');
        my $build_dir = parrot_config($base, $parrot_config, 'top_builddir', 'build_dir');
        my $is_shared = parrot_config($base, $parrot_config, 'parrot_is_shared');
        my $parrot_libdir = parrot_config($base, $parrot_config, 'lib_dir');

        # Convert flags to -optc-*,etc, to pass through ghc. c/ompiler l/inker
        $ldflags =~ s/(^|\s)-/$1-optl-/g;
        $libs =~ s/(^|\s)-/$1-optl-/g;
        $icuflags =~ s/(^|\s)-/$1-optl-/g;
        $include_path =~ s/(^|\s)-/$1-optc-/g;
        $embed_flags .= " -I$include_path" if $include_path =~ /\S/;
        $rpath_blib =~ s/(^|\s)-/$1-optl-/g;

        $embed_flags .= " -I$base/include -L$base/lib -L$base/blib/lib -DPUGS_HAVE_PARROT -L/usr/local/lib $ldflags ";
        $embed_flags .= " -lparrot $libs $icuflags ";
        my $config = $parrot_libdir."/parrot/config/install_config$Config{_o}";
        $config = $parrot_libdir."/parrot/config/parrot_config$Config{_o}" unless -e $config;
        $config = $parrot_libdir."/parrot/config/null_config$Config{_o}" unless -e $config;
        $config = "$build_dir/src/install_config$Config{_o}" unless -e $config;
        $config = "$build_dir/src/parrot_config$Config{_o}" unless -e $config;
        $config = "$build_dir/src/null_config$Config{_o}" unless -e $config;

        die <<"EOD" unless -e $config or $is_shared;
*** Could not find src/null_config.o in $build_dir.
    Solutions include:
        * Remove parrot from PUGS_EMBED
        * Place a built Parrot source tree under $build_dir.
EOD

        $embed_flags .= " $config ";
        $embed_flags .= " $rpath_blib " if -d $build_dir;

        # parrot include paths for hsc2hs
        $hsc2hs_flags .= " -DPUGS_HAVE_PARROT -I$base/include ";

        push @warn, << ".";
*** Embedded 'parrot' enabled.  You can use it for Perl 6 regex support by
    setting the PUGS_REGEX_ENGINE environment variable to "PGE" at runtime.
.
    }
    else {
        my $whichparrot = can_run('parrot');

        if ($whichparrot) {
            push @warn, << ".";
*** External 'parrot' executable found in your PATH at:

        $whichparrot

    You can use it for Perl 6 regex support by setting the
    PUGS_REGEX_ENGINE environment variable to "PGE" at runtime.

    If you want to link against Parrot, set the PUGS_EMBED environment
    variable to contain 'parrot', the PARROT_PATH environment variable to
    the path of a built parrot tree, then run Makefile.PL again.

.
        }
    }

    my $is_win32 = ($^O =~ /MSWin|mingw|cygwin/i);
    my $threaded = (try_compile_and_run("main :: IO ()\nmain = return ()", $ghc, "-threaded")) ? '-threaded' : '';

    if ($threaded && $ENV{PUGS_NO_THREADS}) {
        push @warn, << '.';
*** Thread support disabled due to explicit request in PUGS_NO_THREADS.

.
        $threaded = '';
    }

    my $find_ver = sub {
        `$_[0] $_ 2>&1` =~ /(.* (?:version|build) .*)/i && return $1
            for qw{--version -v -V -? /?};
        return "unknown";
    };

    unlink (my $build_config = 'current.build.yml');
    my $config = get_pugs_config(
        uname               =>  join (" ", (uname)[0,2,4] ),
        regex_engine        =>  ( $ENV{PUGS_REGEX_ENGINE} ?  $ENV{PUGS_REGEX_ENGINE} : 'default' ),
        embedded            =>  join (" ", ( $embed_flags =~ /HAVE_PERL5/ ?  $Config{perlpath} : 'noperl' ),
                                    ( $embed_flags =~ /HAVE_PARROT/
                                        ?  abs_path( File::Spec->catfile( "$ENV{PARROT_PATH}", "parrot" ) )
                                        : 'noparrot' ),
                                    ( $ENV{PUGS_EMBED} =~ /\bhaskell\b/ ?  $ghc : 'nohaskell' )
                                ),
        ghc                 =>  join (" ", [ assert_ghc() ]->[0], $ghc_version,
                                    ( $ghc_flags =~ /HAVE_READLINE/ ?  'readline' : 'noreadline' ),
                                    ( $ghc_flags =~ /HAVE_HSPLUGINS/ ?  'hsplugins' : 'nohsplugins' ),
                                    ( $threaded ? "threads" : "nothreads" ),
                                ),
        cc                  =>  $find_ver->( $Config{cc} ),
    );

    {
        # maybe move this to inc/PugsBuild/MiniYAML.pm ?
        open my $fh, '>', $build_config or die "Cannot open $build_config for writing";
        print $fh "# *** NOTE ***\n";
        print $fh "# This file is generated during Makefile.PL.\n";
        print $fh "# Changes will not persist after running Makefile.PL\n";
        for ( sort keys %$config ) {
            print $fh "$_: $config->{$_}\n";
        }
        close $fh;
    }

    # As of now, Test::TAP::HTMLMatrix is the key dependency for smokes,
    # so we need only check for that.
    eval { require Test::TAP::HTMLMatrix } or push @warn, << '.';
*** You do not appear to have a Smoke Kit installed. You can still build
    Pugs and even run `make test', but you won't be able to run the more
    modern `make smoke' target to produce nice graphs and send them to the
    public smoke server. Installing Task::Smoke from CPAN will bring in
    the necessary dependencies.

.
    # XXX - hsplugins doesn't build with profiles
    my $profiled_flags = $ghc_flags;
    $profiled_flags =~ s{-DPUGS_HAVE_HSPLUGINS}{};
    $profiled_flags =~ s{-package plugins}{};

    my $emit = sub {
        my $o = shift;
        my $c = substr($o, 0, -1) . 'c';
        return "$o : $c\n\t$ghc $threaded $embed_flags $ghc_flags -no-link -no-hs-main -O -o $o $c\n";
    };

    mkdir 'dist';
    mkdir 'dist/build';
    mkdir 'dist/build/src';

    # Using the Win32 Haskell compiler results in a setup program that
    # doesn't grok cygwin paths.  This kludge takes any /cygdrive/
    # style paths and rewrites them.  This really should be factored
    # out to a common module.  Better still, we should make a Cygwin-native
    # GHC.

    if ($Config{osname} eq 'cygwin') {

        # NB.  We're exploiting for's aliasing of variables.
        foreach my $path ($ghc_pkg, $hsc2hs, $ghc) {
			$path = `cygpath -m $path`; chomp $path;
        }
    }

    my $setup_flags = "--prefix=\$(DESTDIR) --with-hc-pkg=$ghc_pkg --with-hsc2hs=$hsc2hs --ghc --with-compiler=$ghc";
    my $precompile_prelude = ' --precompile-prelude '.PugsBuild::Config->lookup('precompile_prelude');

    my $svn_entries = '';

    my $svn_admin_dir = $ENV{SVN_ASP_DOT_NET_HACK} ? '_svn' : '.svn';
    if (-d $svn_admin_dir) {
        $svn_entries = File::Spec->catfile($svn_admin_dir, 'entries');
    }
    #$svn_entries = 'force_run';

    # logic for Judy:

#    if ($Config{osname} ne 'MSWin32') {
#        warn "Configuring Judy...\n";
#        chdir "third-party/judy/Judy-1.0.3";
#        copy('src/Judy.h', '../../HsJudy');
#        system("./configure") unless -e "config.status" and -e "Makefile";
#        chdir "../../..";
#    }
#
#    my $judyclean;
#    if ($Config{osname} eq 'MSWin32') {
#        $judyclean = 'cd third-party\judy\Judy-1.0.3\src && '.
#            'nmake /nologo /F Makefile.win32 clean';
#    } else {
#        my $make = $Config{make};
#
#        # Judy at this moment wants GNU make.
#        $make = 'gmake' unless `$make --version` =~ /GNU/;
#
#        $judyclean = "cd third-party/judy/Judy-1.0.3 \&\& $make clean \&\& perl cleanmore.pl";
#    }

    my @ghci_flags = qw( -hide-all-packages -package base -package filepath -package parsec -package template-haskell -package readline -package unix -package haskell98 -package mtl -package stm -package network -package HsSyck -package pugs-hsregex );

    postamble(fixpaths(<< "."));
$config_h : lib/Perl6/Pugs.pm util/config_h.pl
	\$(PERL) util/config_h.pl "$ghc $ghc_flags"

$version_h :
	\$(PERL) util/version_h.pl $version_h

@{[join("\n", map {$emit->($_)} grep { /\.o$/ } @prereqs)]}

src/Pugs/Config.hs : util/PugsConfig.pm current.build.yml
	\$(PERL) -Iutil -MPugsConfig -e "PugsConfig->write_config_module" > src/Pugs/Config.hs

src/gen_prelude$Config{_exe} : src/gen_prelude.hs
	$ghc -O0 --make -o src/gen_prelude$Config{_exe} src/gen_prelude.hs

src/Pugs/CodeGen/PIR/Prelude.hs : src/gen_prelude$Config{_exe} src/perl6/Prelude/PIR.pm
	\@\$(PERL) -e "mkdir q-src/Pugs/CodeGen/PIR-"
	src/gen_prelude$Config{_exe} Pugs.CodeGen.PIR.Prelude < src/perl6/Prelude/PIR.pm > src/Pugs/CodeGen/PIR/Prelude.hs

src/Pugs/Prelude.hs : src/perl6/Prelude.pm util/gen_prelude.pl
	\$(PERL) util/gen_prelude.pl -v --touch --inline -i src/perl6/Prelude.pm --output src/Pugs/Prelude.hs

${() = '%.hpp : %.hs @prereqs $version_h
	$ghc $threaded $ghc_flags -DHADDOCK -E \$< -o \$@
	\$(PERL) util/munge_haddock.pl \$@'; \''}

.SUFFIXES: .hs .hpp

.hs.hpp :
	$ghc $threaded $ghc_flags -DHADDOCK -E \$< -o \$@
	\$(PERL) util/munge_haddock.pl \$@

.SUFFIXES: .hsc .hs

.hsc.hs :
	\$(PERL) -MFile::Spec -e "sub p () { File::Spec->splitpath(ARGV->[0]) }; chdir((p)[1]); system(q($hsc2hs), qw($hsc2hs_flags), (p)[2]);" \$<

.SUFFIXES: .grammar .hs

.grammar.hs :
	\$(PERL) util/file_to_hs.pl \$< \$@

.SUFFIXES: .pil .hs

.pil.hs :
	\$(PERL) util/file_to_hs.pl \$< \$@

util/drift.pl:

@{[ mk_drift_rules( qw(src/Emit/PIR src/Pugs/AST/Internals src/Pugs/PIL1 src/Pugs/PIL2) ) ]}

haddock : $version_h $config_h @hppfiles dist/doc/html
	haddock -t Pugs-$version -h -o dist/doc/html/ @hppfiles
	\@\$(RM_F) @{[map "$_.pre", @hppfiles]} @hppfiles
	\@\$(PERL) -le "print and print q-*** API Documentation generated in @{[File::Spec->catfile('dist', 'doc', 'html', 'index.html')]}-"

# make haddock one file at a time to get partial, unlinked output
haddock-broken : $version_h $config_h @hppfiles dist/doc/html
@{[join("\n", map {"\thaddock -t Pugs-$version -h -o dist/doc/html/ $_"} @hppfiles)]}
	\@\$(RM_F) @{[map "$_.pre", @hppfiles]} @hppfiles
	\@\$(PERL) -le "print and print q-*** Unlinked API Documentation generated in @{[File::Spec->catfile('dist', 'doc', 'html', 'index.html')]}-"

dist/doc/html :
	\@\$(PERL) -MFile::Path -e "mkpath q-dist/doc/html-"

pugs_requirements : instances src/Pugs/Config.hs src/Pugs/CodeGen/PIR/Prelude.hs @srcfiles $version_h $config_h config.yml src/perl6/Prelude.pm src/Pugs/Prelude.hs

prof :: profiled

soonprof :: unoptimised-profiled

unoptimized-profiled :: unoptimised-profiled

unoptimised-profiled :: pugs_requirements
	\$(PERL) util/build_pugs.pl _+SETUP $setup_flags _-SETUP _+GHC $version $ghc $ghc_pkg $ghc_version $setup --make -O0 -auto-all -prof $threaded $profiled_flags $ccdlflags $embed_flags $ghc_output _-GHC _+GEN_PRELUDE $precompile_prelude --pugs $thispugs

profiled :: pugs_requirements
	\$(PERL) util/build_pugs.pl _+SETUP $setup_flags _-SETUP _+GHC $version $ghc $ghc_pkg $ghc_version $setup --make -O -auto-all -prof $threaded $profiled_flags $ccdlflags $embed_flags $ghc_output _-GHC _+GEN_PRELUDE $precompile_prelude --pugs $thispugs

pugs.prof :: profiled
	find t -type f | grep -v D | grep -v R | grep -v pugsrun | ./pugs +RTS -p -RTS -e 'my sub exit {}; for =\$\$*IN -> \$\$t is copy { \$\$t .= chomp; require \$\$t }'

optimised :: optimized

optimized :: pugs_requirements
	\$(PERL) util/build_pugs.pl _+SETUP $setup_flags _-SETUP _+GHC $version $ghc $ghc_pkg $ghc_version $setup --make -O $threaded $ghc_flags $ccdlflags $embed_flags $ghc_output _-GHC _+GEN_PRELUDE $precompile_prelude --pugs $thispugs

soon :: unoptimized

unoptimised :: unoptimized

unoptimized :: pugs_requirements
	\$(PERL) util/build_pugs.pl _+SETUP $setup_flags _-SETUP _+GHC $version $ghc $ghc_pkg $ghc_version $setup --make -O0 $threaded $ghc_flags $ccdlflags $embed_flags $ghc_output _-GHC _+GEN_PRELUDE $precompile_prelude --pugs $thispugs

$pugs : pugs_requirements
	\$(PERL) util/build_pugs.pl _+SETUP $setup_flags _-SETUP _+GHC $version $ghc $ghc_pkg $ghc_version $setup --make __optimization__ $threaded $ghc_flags $ccdlflags $embed_flags $ghc_output _-GHC _+GEN_PRELUDE $precompile_prelude --pugs $thispugs


pirtest : test-pir

pirsmoke : smoke-pir

jssmoke : smoke-js

test :: blib6/lib/Test.pm.yml

prelude :: blib6/lib/Prelude.pm.yml

pure_all :: blib6/lib/Test.pm.yml

test-all : test test-js test-pir test-perl5

test-pir :
	\$(PERL) -e "ENV->{HARNESS_PERL_SWITCHES}=q+-B PIR+; system qq+$Config{make}+, q+test+"

test-js :
	\$(PERL) -e "ENV->{HARNESS_PERL_SWITCHES}=q+-B JS+; system qq+$Config{make}+, q+test+"

test-perl5 :
	\$(PERL) -e "ENV->{HARNESS_PERL_SWITCHES}=q+-B PERL5+; system qq+$Config{make}+, q+test+"

test-redsix :
	\$(PERL) -e "ENV->{HARNESS_PERL_SWITCHES}=q+-B REDSIX+; system qq+$Config{make}+, q+test+"

blib6/lib/Test.pm.yml :: ext/Test/lib/Test.pm
	\$(NOECHO) \$(ECHO) "Precompiling Test.pm..."
	$thispugs -CParse-YAML ext/Test/lib/Test.pm > blib6/lib/Test.pm.yml

blib6/lib/Prelude.pm.yml :
	\$(NOECHO) \$(ECHO) "Precompiling Prelude.pm..."
	util/gen_prelude.pl -v -i src/perl6/Prelude.pm -p $thispugs --output blib6/lib/Prelude.pm.yml

upload-smoke : smoke.yml
	\$(PERL) util/smokeserv/smokeserv-client.pl smoke.html smoke.yml

smoke-upload : upload-smoke

smoke.yml :
	\$(PERL) util/run-smoke.pl . smoke.html

smoke : smoke-pugs

smoke-all : smoke-pugs smoke-js smoke-pir smoke-perl5

smoke-pugs : $pugs util/run-smoke.pl all blib6/lib/Test.pm.yml
	\$(PERL) util/run-smoke.pl . smoke.html

smoke-pir : $pugs util/run-smoke.pl all
	\$(PERL) util/run-smoke.pl . smoke-pir.html -BPIR

smoke-jsperl5 : $pugs util/run-smoke.pl all
	\$(PERL) -e "ENV->{PUGS_RUNTIME}=q+JSPERL5+; exec qw+$^X util/run-smoke.pl . smoke-jsperl5.html+"

smoke-js : $pugs util/run-smoke.pl all
	\$(PERL) -e "ENV->{PUGS_RUNTIME}=q+JS+; exec qw+$^X util/run-smoke.pl . smoke-js.html+"

smoke-perl5 : $pugs util/run-smoke.pl all
	\$(PERL) -e "ENV->{PUGS_RUNTIME}=q+PERL5+; exec qw+$^X util/run-smoke.pl . smoke-perl5.html -BPERL5+"

smoke-redsix : $pugs util/run-smoke.pl all
	\$(PERL) -e "ENV->{PUGS_RUNTIME}=q+REDSIX+; exec qw+$^X util/run-smoke.pl . smoke-redsix.html -BREDSIX+"


ghci : @prereqs @derived_srcfiles
	$ghc @{[ dethread_flags($ghc_flags) ]} $ghc_output -DPUGS_UNDER_GHCI -no-link --make -O0 -fglasgow-exts -L. -idist/build -Ldist/build -idist/build/src -Ldist/build/src -isrc src/Prereqs.hs @prereqs
	\@\$(RM_RF) src/Pugs/*/*_stub.*
	$ghc @{[ dethread_flags($ghc_flags) ]} @ghci_flags $ghc_output -DPUGS_UNDER_GHCI --interactive -fglasgow-exts $ghci_debugging -L. -idist/build -Ldist/build -idist/build/src -Ldist/build/src -isrc src/Main.hs @prereqs

ctags : @prereqs @derived_srcfiles
	echo ":ctags" | $ghc $ghc_flags @ghci_flags $ghc_output --interactive -osuf moose -hisuf miise -fglasgow-exts -L. -idist/build -Ldist/build -idist/build/src -Ldist/build/src -isrc src/Main.hs @prereqs

etags : @prereqs @derived_srcfiles
	echo ":etags" | $ghc $ghc_flags @ghci_flags $ghc_output --interactive -osuf moose -hisuf miise -fglasgow-exts -L. -idist/build -Ldist/build -idist/build/src -Ldist/build/src -isrc src/Main.hs @prereqs

pil$Config{_exe} : $config_h @srcfiles src/PIL/Native/Bootstrap.hs src/PIL/Native/Syntax.hs
	$ghc $ghc_flags --make -fglasgow-exts -H0 -isrc -Isrc -L. -fno-warn-name-shadowing -o pil$Config{_exe} -main-is PIL.main src/PIL.hs

pili : pil$Config{_exe}
	$ghc --interactive -fglasgow-exts -isrc -Isrc -L. -static -fno-warn-name-shadowing src/PIL.hs

tags : @srcfiles
	$hasktags -c @{[ grep { !/PIL/ } @srcfiles ]}
	sort tags > tags.tmp
	mv tags.tmp tags

config.yml:

src/perl6/Prelude.pm:

INST6_ARCHLIB = blib6/arch
INST6_SCRIPT = blib6/script
INST6_BIN = blib6/bin
INST6_LIB = blib6/lib
INST6_MAN1DIR = blib6/man1
INST6_MAN3DIR = blib6/man3
INSTPUGS_LIB = blib6/pugs

build_perl5 ::
@{[for_perl5("
	cd __DIR__ && $^X Makefile.PL && \$(MAKE)
")]}

clean ::
	\@\$(RM_RF) third-party/installed
@{[for_perl5("
	-cd __DIR__ && \$(TEST_F) \$(FIRST_MAKEFILE) && \$(MAKE) clean
")]}

realclean ::
	\@\$(RM_RF) third-party/installed

@{[for_perl5("
	-cd __DIR__ && \$(TEST_F) \$(FIRST_MAKEFILE) && \$(MAKE) realclean
")]}

pure_all :: build_perl5
	\$(PERLRUN) util/src_to_blib.pl

register ::
	\$(PERLRUN) util/ghc_setup.pl copy --copy-prefix=\$(DESTDIR)
	\$(PERLRUN) util/ghc_setup.pl register --prefix=\$(DESTDIR)

pure_site_install ::
	\$(NOECHO) \$(MOD_INSTALL) \\
		\$(INST6_LIB) \$(DESTDIR)$config->{sitelib} \\
		\$(INST6_ARCHLIB) \$(DESTDIR)$config->{sitearch} \\
		\$(INST6_BIN) \$(DESTDIR)$config->{sitebin} \\
		\$(INST6_SCRIPT) \$(DESTDIR)$config->{sitescript} \\
		\$(INST6_MAN1DIR) \$(DESTDIR)$config->{installsiteman1dir} \\
		\$(INST6_MAN3DIR) \$(DESTDIR)$config->{installsiteman3dir} \\
		\$(INSTPUGS_LIB) \$(DESTDIR)$config->{sitelib}/auto/pugs
#	\$(PERLRUN) util/ghc_setup.pl copy --copy-prefix=\$(DESTDIR)

pure_vendor_install ::
	\$(NOECHO) \$(MOD_INSTALL) \\
		\$(INST6_LIB) \$(DESTDIR)$config->{privlib} \\
		\$(INST6_ARCHLIB) \$(DESTDIR)$config->{archlib} \\
		\$(INST6_BIN) \$(DESTDIR)$config->{installbin} \\
		\$(INST6_SCRIPT) \$(DESTDIR)$config->{installscript} \\
		\$(INST6_MAN1DIR) \$(DESTDIR)$config->{installman1dir} \\
		\$(INST6_MAN3DIR) \$(DESTDIR)$config->{installman3dir} \\
		\$(INSTPUGS_LIB) \$(DESTDIR)$config->{privlib}/auto/pugs
#	\$(PERLRUN) util/ghc_setup.pl copy --copy-prefix=\$(DESTDIR)
.
}

sub for_perl5 {
    my $cmd = shift;
    $cmd =~ s{\n}{}g;
    my @cmds;
    foreach my $dir (grep { -d } glob('perl5/*')) {
        -e "$dir/Makefile.PL" or next;

        # Skip XS modules for now
        next if glob("$dir/*.xs") or glob("$dir/*.i") or $dir =~ /-\d+/;

        my $this = $cmd;
        $this =~ s{__DIR__}{$dir}g;
        push @cmds, $this;
    }
    return join("\n", @cmds);
}

our $do_run;
sub try_compile_and_run {
    local $do_run = 1;
    try_compile(@_);
}

sub try_compile {
    my $code = shift;
    my $temp = "pugs-tmp-$$";
    my $ghc  = shift or croak "try_compile called without path to ghc";

    eval {
        open TMP, "> $temp.hs";
        print TMP $code;
        close TMP;
        system(
            $ghc, @_,
            "--make", "-v0",
            -o => "$temp.exe",
            "$temp.hs"
        );

    };

    my $ok = -s "$temp.exe";

    if ($do_run) {
        $ok = 0 unless system(abs_path("$temp.exe")) == 0;
    }

    unlink("$temp.exe");
    unlink("$temp.hs");
    unlink("$temp.hi");
    unlink("$temp.o");

    return $ok;
}

sub parrot_config {
    my $base = shift;
    my $parrot_config = shift;
    my $ac_path = abs_path();
    my $sp_base = $base;
    $sp_base =~ s{\\}{\/}g;
    chdir( $sp_base ) or die "Can't change dir to '$sp_base'";
    my $parrot = "parrot$Config{_exe}";
    $parrot = "bin/$parrot" if not -e $parrot;
    my $value;
    while (@_) {
        my $config = shift;
        $value = `./$parrot $parrot_config $config`;
        $value =~ /no such key:/ or last;
    }
    die $value if $value =~ /no such key:/;
    chomp($value);
    chdir( $ac_path ) or die "Can't change dir to '$ac_path'";
    return $value;
}

sub which {
    my $file = shift;
    for ( File::Spec->path() ) {
        my $full_name = File::Spec->catfile($_, $file);
        return $full_name if -e $full_name;
    }
    return undef;
}

sub preprocess {
    my ($infile, $outfile, %substitutions) = @_;

    open IN, '<', $infile or die "failed to open $infile ($!)";
    open OUT, '>', $outfile or die "failed to open $outfile ($!)";

    if ($Config{osname} eq 'cygwin') {
		for my $path (values %substitutions){
			$path = `cygpath -m $path`; chomp $path;
		}
    }

    while (<IN>) {
        while (my ($pat, $subst) = each(%substitutions)) {
            $subst =~ s{\\}{\\\\}g;
            s/__${pat}__/$subst/g
        }
        print OUT $_;
    }

    close OUT;
    close IN;
}

sub compile_hs {
    my ($ghc, $prefix, $out) = @_;

    unlink($prefix . $_) for (
        $Config{_exe},
        '.o',
        '.hi',
    );

    my $rv = system($ghc, '--make', '-o' => $out,
        (-e $prefix. '.hs') ? $prefix.'.hs' : $prefix.'.lhs'
    );
    unless (-s $out) {
        die << ".";
*** Building Setup$Config{_exe} failed (exit code $rv)
    Please check your GHC and Cabal installation.
.
    }
}

sub mk_drift_rules {
    join "\n\n",
    ("instances: " . join " ", map { "$_/Instances.hs" } @_),
    (map { "$_.hs:" } @_),
    map { <<"." } @_;
$_/Instances.hs: $_.hs util/drift.pl
\t\$(PERL) util/drift.pl $_.hs
.
}
__END__