#!/usr/bin/perl

# Copyright 2016-2018 See AUTHORS file
#
# 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 feature 'say';
use Cwd;
use File::Temp;

my $current_git_directory = qx|git rev-parse --show-toplevel 2>/dev/null|;
chomp $current_git_directory;
my $cwd = getcwd;
chdir($current_git_directory);
my $commit_message_tmpfile = File::Temp->new();
my @changed_files          = qx|git status -s|;
my $n_changed_files        = scalar @changed_files;

die "No files changed. Exiting." if $n_changed_files <= 0;
my %atoms = ();

sub _build_git_repo {
    my ($file_name) = @_;
    my $commit_message;

    if ( $file_name
        =~ /conf\/(home|intel|arm(arch|hfp|v6l|vtl))\/(entropy|portage|repo)\/(.*)/
        )
    {
        $commit_message = "$1/$4: ";
    }
    elsif ( $filename eq
        "conf/noarch/entropy/packages/packages.server.dep_blacklist" )
    {
        $commit_message = "dep_blacklist: ";
    }
    elsif ( $filename eq
        "conf/noarch/entropy/packages/packages.server.dep_rewrite" )
    {
        $commit_message = "dep_rewrite: ";
    }

    if ($commit_message) {
        print $commit_message_tmpfile $commit_message;
        system( "git commit -eF " . $commit_message_tmpfile->filename );
        unlink($commit_message_tmpfile) if -e $commit_message_tmpfile;
    }

}

sub _overlay_git_repo {
    die "If you are in the overlay, call me in the ebuild dir"
        if $current_git_directory eq getcwd;
    chdir($cwd);
    die "I'm not pleased.. but you could force with --force"
        if ( _system("repoman") && $ARGV[0] ne "--force" );
    _system("repoman commit $ARGV[0]");
}

sub _system {
    my $prog = shift;
    my $rv = system( {$prog} $prog => @_ );
    if ( $rv == -1 ) { say("Can't launch $prog: $!"); return 1; }
    elsif ( my $s = $rv & 127 ) {
        say("$prog died from signal $s");
        return 1;
    }
    elsif ( my $e = $rv >> 8 ) { say("$prog exited with code $e"); return 1; }
    return 0;
}

foreach my $file (@changed_files) {
    chomp $file;
    my @words = split( ' ', $file, 2 );
    next if $words[0] eq "??";    # allow "dangling" files
    my $file_name = $words[1];
    if ( $file_name =~ /conf\/(intel|arm|noarch)/ ) {
        _build_git_repo($file_name);
    }
    elsif ( $file_name =~ /\.ebuild/ ) {
        _overlay_git_repo($file_name);
    }

}