#!/usr/bin/perl

use strict;
use warnings;
use autodie qw(:all);;

use Path::Tiny;

my $infile = path($ARGV[0]);
my $outfile = path($ARGV[1]);
my @pkgfiles = split( ' ', $ARGV[2] );
my @tweakfiles = split( ' ', $ARGV[3] );

my $outdir = $outfile->parent;
my $altinfile = path( $infile->parent, 'script.sh.in' );
my $altoutfile = path( $outdir, 'script.sh' );

my ($pkgdesc, @pkg);
foreach (@pkgfiles) {
	foreach (path($_)->lines) {
		chomp;
		/^[#]{2} (.*)/ and $pkgdesc .= "# $1\n";
		/^[#]{1} (.*)/ and $pkgdesc .= "#  * $1\n";
		/^[^#]+/ and push @pkg, $_;
	};
};
chomp $pkgdesc;

my ($tweakdesc, $tweaklist);
foreach (@tweakfiles) {
	foreach (path($_)->lines) {
		chomp;
		/^[#]{2} (.*)/ and $tweakdesc .= "# $1\n";
		/^[#]{1} (.*)/ and $tweakdesc .= "#  * $1\n";
		/^(?!#)\s*(.+)/ and $tweaklist .= "$1;"
	};
};
chomp $tweakdesc;

my $pkglist = join( ' ', @pkg );

$outdir->mkpath;
$_ = $altinfile->slurp;
s,__PKGDESC__,$pkgdesc,;
s,__PKGLIST__,$pkglist,;
s,__TWEAKDESC__,$tweakdesc,;
s,__TWEAKLIST__,$tweaklist,;
s,chroot\s+/target\s+,,g;
s,/target/,/,g;
$altoutfile->spew($_);
$_ = $infile->slurp;
s,__PKGDESC__,$pkgdesc,;
s,__PKGLIST__,$pkglist,;
s,__TWEAKDESC__,$tweakdesc,;
s,__TWEAKLIST__,$tweaklist,;
$outfile->spew($_);

1;