#!/usr/bin/perl

# Copyright © 2022 Felix Lechner <felix.lechner@lease-up.com>
#
# based on a shell script library by John Goerzen
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use v5.20;
use warnings;
use utf8;

use Unicode::UTF8 qw(encode_utf8);

use Debian::Debhelper::Buildsystem::Haskell::Recipes qw(
  run
  installable_hc
  hc_pkgdir
);
use Debian::Debhelper::Dh_Lib;

init();

die encode_utf8('No Setup.hs executable named.')
  unless length $ENV{DEB_SETUP_BIN_NAME};

for my $installable (@{ $dh{DOPACKAGES} }) {

    my $compiler = installable_hc($installable) || $ENV{DEB_DEFAULT_COMPILER};
    my $pkgdir = hc_pkgdir($compiler);

    my $output = run($ENV{DEB_SETUP_BIN_NAME},
        'register', "--builddir=dist-$compiler",
        qw{--gen-pkg-config --verbose=verbose+nowrap});

    if ($output
        =~ m{^Creating \s package \s registration \s (file|directory): \s+ (\S+) $}mx) {

        my $path = $2;
        my $pkg_config = $2;

        if (-d $path) {
            # https://downloads.haskell.org/cabal/Cabal-3.0.0.0/doc/users-guide/installing-packages.html#cmdoption-setup-register-gen-pkg-config
            # If the package registration is a directory, choose the first one since the other(s) will be internal libraries that we don't want to install.
            my @pkg_configs = glob("$path/*");
            $path = $pkg_configs[0];
        }

        run(qw{sed -i}, 's/^exposed: True$/exposed: False/', $path)
            if length $ENV{HASKELL_HIDE_PACKAGES};

        run(qw{install -D --mode=644},
            $path, "debian/$installable/$pkgdir/$pkg_config");

        run(qw{rm -rf}, $pkg_config);

    } else {

        die encode_utf8('Cannot generate package registration.');
    }
}

exit;

=head1 NAME

dh_haskell_install_ghc_registration - Haskell install helper

=head1 SYNOPSIS

B<dh_haskell_install_ghc_registration> [S<I<debhelper options>>]

=head1 DESCRIPTION

dh_haskell_install_ghc_registration is a Debhelper program that helps with installing files
when building Haskell libraries.

=head1 SEE ALSO

L<debhelper(7)>

=head1 AUTHOR

John Goerzen <jgoerzen@complete.org>

Based on ideas in dh_python by Josselin Mouette <joss@debian.org>

=cut

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