#!/usr/bin/perl
#
# runfg -- front end for setting up the FG_ROOT env variable and launching 
#          the fg executable.
#
# Written by Curtis Olson, started September 1997.
#
# Copyright (C) 1997 - 1998  Curtis L. Olson  - http://www.flightgear.org/~curt
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# $Id$
#---------------------------------------------------------------------------


$prefix = "@prefix@";
# print "-> $prefix\n";

# potential names of Flight Gear executable to try
@files = ( "fgfs", "fgfs.exe" );

# search for the executable
# potential paths where the executable may be found
@paths = ( ".", "Simulator/Main", $prefix );

$savepath = "";
$savefile = "";

foreach $path (@paths) {
    foreach $file (@files) {
	# print "'$savepath'\n";
	if ( $savepath eq "" ) {
	    # don't search again if we've already found one
	    # print "checking $path" . "bin/$file and $path" . "$file\n";
	    if ( -x "$path/bin/$file" ) {
		$saveprefix = $path;
		$savepath = "$path/bin";
		$savefile = "$file";
	    } elsif ( -x "$path/$file" ) {
		$saveprefix = $path;
		$savepath = "$path";
		$savefile = "$file";
	    }
	} else {
	    # print "skipping $path/bin/$file and $path/$file\n";
	}
    }
}

die "Cannot locate program.\n" if ( $savepath eq "" );


# search for the "FlightGear" root directory
@paths = ( $prefix, $saveprefix, $ENV{HOME} );

$fg_root = "";

foreach $path (@paths) {
    # print "trying $path\n";

    if ( $fg_root eq "" ) {
	if ( -d "$path/FlightGear" ) {
	    $fg_root = "$path/FlightGear";
	} elsif ( -d "$path/share/FlightGear" ) {
	    $fg_root = "$path/share/FlightGear";
	}
    }
}

die "Cannot locate FG root directory (data)\n" if ( $fg_root eq "" );

# run Flight Gear
print "Running $savepath/$savefile --fg-root=$fg_root @ARGV\n";
exec("$savepath/$savefile --fg-root=$fg_root @ARGV");


#---------------------------------------------------------------------------