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#! perl
# Copyright (C) 2009 The Perl Foundation

use 5.008;
use strict;
use warnings;
use Text::ParseWords;
use Getopt::Long;
use Cwd;
use lib "tools/lib";
use NQP::Configure qw(sorry slurp cmp_rev gen_nqp read_config
fill_template_text fill_template_file
system_or_die verify_install);

my $lang = 'Rakudo';
my $lclang = lc $lang;
my $uclang = uc $lang;

MAIN: {
    if (-r "config.default") {
        unshift @ARGV, shellwords(slurp('config.default'));
    }

    my %config;
    my $config_status = "${lclang}_config_status";
    $config{$config_status} = join(' ', map { "\"$_\""} @ARGV);

    my $exe = $NQP::Configure::exe;

    my %options;
    GetOptions(\%options, 'help!', 'prefix=s',
               'with-nqp=s', 'gen-nqp:s',
               'with-parrot=s', 'gen-parrot:s', 'parrot-option=s@',
               'parrot-make-option=s@',
               'make-install!', 'makefile-timing!',
               );

    # Print help if it's requested
    if ($options{'help'}) {
        print_help();
        exit(0);
    }

    my $prefix = $options{'prefix'} || cwd().'/install';
    my $with_nqp = $options{'with-nqp'};
    my $gen_nqp = $options{'gen-nqp'};
    my $with_parrot = $options{'with-parrot'};
    my $gen_parrot = $options{'gen-parrot'};

    # Save options in config.status
    unlink('config.status');
    if (open(my $CONFIG_STATUS, '>', 'config.status')) {
        print $CONFIG_STATUS
            "$^X Configure.pl $config{$config_status} \$*\n";
        close($CONFIG_STATUS);
    }

    # --with-parrot and --gen-parrot imply --gen-nqp
    if (!defined $gen_nqp && (defined $with_parrot || defined $gen_parrot)) {
        $gen_nqp = '';
    }

    # determine the version of NQP we want
    my ($nqp_want) = split(' ', slurp('tools/build/NQP_REVISION'));

    if (defined $gen_nqp) {
        $with_nqp = gen_nqp($nqp_want, %options);
    }

    my @errors;

    my %nqp_config;
    if ($with_nqp) {
        %nqp_config = read_config($with_nqp)
            or push @errors, "Unable to read configuration from $with_nqp.";
    }
    else {
        %nqp_config = read_config("$prefix/bin/nqp$exe", "nqp$exe")
            or push @errors, "Unable to find an NQP executable.";
        $with_nqp = fill_template_text('@bindir@/nqp@exe@', %nqp_config)
    }

    %config = (%config, %nqp_config);
    my $nqp_have = $config{'nqp::version'} || '';
    if ($nqp_have && cmp_rev($nqp_have, $nqp_want) < 0) {
        push @errors, "NQP revision $nqp_want required (currently $nqp_have).";
    }

    if (!@errors) {
        push @errors, verify_install([ @NQP::Configure::required_parrot_files,
                                       @NQP::Configure::required_nqp_files ],
                                     %config);
        push @errors,
          "(Perhaps you need to 'make install', 'make install-dev',",
          "or install the 'devel' package for NQP or Parrot?)"
          if @errors;
    }

    if (@errors && !defined $gen_nqp) {
        push @errors,
          "\nTo automatically clone (git) and build a copy of NQP $nqp_want,",
          "try re-running Configure.pl with the '--gen-nqp' or '--gen-parrot'",
          "options. Or, use '--with-nqp=' or '--with-parrot=' to explicitly",
          "specify the NQP or Parrot executable to use to build $lang.";
    }

    sorry(@errors) if @errors;

    print "Using $with_nqp (version $config{'nqp::version'}).\n";

    $config{'makefile-timing'} = $options{'makefile-timing'};
    $config{'stagestats'} = '--stagestats' if $options{'makefile-timing'};
    $config{'shell'} = $^O eq 'MSWin32' ? 'cmd' : 'sh';
    if ($^O eq 'MSWin32' or $^O eq 'cygwin') {
        $config{'dll'} = '$(PARROT_BIN_DIR)/$(PARROT_LIB_SHARED)';
        $config{'dllcopy'} = '$(PARROT_LIB_SHARED)';
        $config{'make_dllcopy'} =
            '$(PARROT_DLL_COPY): $(PARROT_DLL)'."\n\t".'$(CP) $(PARROT_DLL) .';
    }

    my $make = fill_template_text('@make@', %config);
    fill_template_file('tools/build/Makefile.in', 'Makefile', %config);

    {
        no warnings;
        print "Cleaning up ...\n";
        if (open my $CLEAN, '-|', "$make clean") {
            my @slurp = <$CLEAN>;
            close($CLEAN);
        }
    }

    if ($options{'make-install'}) {
        system_or_die($make);
        system_or_die($make, 'install');
        print "\n$lang has been built and installed.\n";
    }
    else {
        print "\nYou can now use '$make' to build $lang.\n";
        print "After that, '$make test' will run some tests and\n";
        print "'$make install' will install $lang.\n";
    }

    exit 0;
}


# Print some help text.
sub print_help {
    print <<"END";
Configure.pl - $lang Configure

General Options:
--help Show this text
--prefix=dir Install files in dir
--with-nqp=path/to/bin/nqp
NQP executable to use to build $lang
--gen-nqp[=branch]
Download and build a copy of NQP
--with-parrot=path/to/bin/parrot
Parrot executable to use to build NQP
--gen-parrot[=branch]
Download and build a copy of Parrot
--parrot-option='--option'
Options to pass to Parrot's Configure.pl
--parrot-make-option='--option'
Options to pass to Parrot's make, for example:
--parrot-make-option='--jobs=4'
--makefile-timing Enable timing of individual makefile commands

Configure.pl also reads options from 'config.default' in the current directory.
END

    return;
}

# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4:
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