#! /usr/bin/perl
use strict;
use Getopt::Long;

# options
my @optlist = ("h|help!","v|verbose!","d=s","J=s","cp|classpath=s","C=s");
my $result = GetOptions @optlist;
our ($opt_h, $opt_v, $opt_d, $opt_J,$opt_cp, $opt_C);

# -h option || check the number of arguments
if ($opt_h || @ARGV < 1 ) {
    usage();
    exit 1;
}

# variables 
my $pljava       = "pljava";
my $pljava_opts  = "";
my $pljavac      = "pljavac";
my $pljavac_opts = "";
my $java_dest    = ".";

if ($opt_v) { # -v option
    $pljava_opts  .= " -v";
    $pljavac_opts .= " -v";
}

if ($opt_d) { # -d option
    if (! -d $opt_d) { 
	&message("mkdir $opt_d, 0777");
	mkdir $opt_d, 0777 || &error("can not mkdir $opt_d");
    }
    $java_dest = $opt_d;
}

if ($opt_J) { # -J option
    $pljava_opts .= " -J '$opt_J'";
}

if ($opt_cp) { # -cp option
    $pljavac_opts .= " -cp '$opt_cp'";
} 

if ($opt_C) { # -C option
    $pljavac_opts .= " -C '$opt_C'";
}

# Prolog --> Java
foreach my $file (@ARGV) {
    my $cmd1 = "$pljava $pljava_opts -d $java_dest $file";
    &message($cmd1);
    system($cmd1) && error("$cmd1 fails");
}

# Java --> Class
my $cmd2 = "$pljavac $pljavac_opts $java_dest/*.java";
&message($cmd2);
system($cmd2) && error("$cmd2 fails");

exit 0;

# sub
sub usage {
    print "\nUsage: $0 [-options] prolog-file [prolog-files]\n";
    print "\n where options include:\n";
    print "\t-h -help         : print this help message\n";
    print "\t-v -verbose      : enable verbose output\n";
    print "\t-d directory     : set the destination directory for java files.\n";
    print "\t                 : make it if not exist\n";
    print "\t-J option        : option must be enclosed by '.\n";
    print "\t                 : pass option to the Java Virtual Machine\n";
    print "\t                 : (ex. -J '-Xmx100m -verbose:gc')\n";
    print "\t-cp -classpath <class search path of directories and zip/jar files>\n";
    print "\t                 : A : separated list of directories and zip/jar files.\n";
    print "\t-C option        : option must be enclosed by '.\n";
    print "\t                 : pass option to the Java Compiler\n";
    print "\t                 : (ex. -C '-deprecation')\n";
    print "\n";
}

sub message {
    my ($x) = @_;
    if ($opt_v) { # check -v option
	print "\% $x\n";
    }
}

sub error {
    my ($x) = @_;
    print "\% ERROR: $x: $0\n";
    exit(1);
}