#!@PERL@

$| = 1;

$shared_extension = "so";
$lib_extension = "a";

@L = ();
@l = ();

%option =  (
	'shared', 1,
	'debug', 0,
	'profile', 0,
	'gc', 0
);

if($ARGV[0] eq "-h" || $ARGV[0] eq '') {
	print "usage: which_lib.pl -xdebug [-Lpath ...] -llibrary shared=yes|no ";
	print "debug=yes|no profile=yes|no gc=yes|no\n"; 
	exit;
}

for $i (0..$#ARGV) {
	$arg = $ARGV[$i];
#	print "ARGUMENT: $arg\n";
	if ($arg =~ /^-x/) {
		$arg = substr($arg,2);
		print "setting debuglevel $arg\n" if $arg > 8;
		$debug = $arg;
	}
	elsif ($arg =~ /^-L/) {
		$arg = substr($arg,2);
		print "adding library path $arg\n" if $debug > 8;
		push(@L, $arg);		
	}
	elsif ($arg =~ /^-l/) {
		$arg = substr($arg,2);
		print "adding lib $arg\n" if $debug > 8;
		push(@l, $arg);
	}
	elsif ($arg =~ /=/ ) {
		print "parsing option $arg\n" if $debug > 8;
		
		($key, $value) = split(/=/, $arg);
		if ($key eq "shared" || $key eq "debug" || $key eq "profile" || $key eq "gc") { 
			if ($value =~ /[yY][eE][sS]/) {
				$option{$key} = 1;
			}
			elsif ($value =~ /[nN][oO]/) {
				$option{$key} = 0;
			}
			else {
				$option{$key} = 0;
				# die "unknown value $value for option $key\n\n";
			}
		}
	} 
	else {
		print "usage: which_lib -xdebug [-Lpath ...] -llibrary shared=yes|no ";
		print "debug=yes|no profile=yes|no\n"; 
		exit;
	}
}

if ($debug > 1) {
	print "looking for\n", join("\n", @l), "\nin\n", join("\n", @L), "\n\n";
	print "using options:\n";
	print "  shared:  $option{'shared'}\n";
	print "  debug:   $option{'debug'}\n";
	print "  profile: $option{'profile'}\n";
	print "  gc:      $option{'gc'}\n";
}

foreach $j (0..$#l) {

	$l = $l[$j];

	@possible_libs = ();
	%pathes = ();

  $preferedlib = '';
	
	foreach $i (0..$#L) {
		local($L) = $L[$i];
		if (!opendir(DIR, $L)) { 
			next; 
		}
		local(@filenames) = readdir(DIR);
		closedir(DIR);
	
		for (@filenames) {
			next if $_ eq '.';
			next if $_ eq '..';
			local ($file) = $_;

			if ($file =~ /\.$shared_extension$/) {
				$file =~ s/\.$shared_extension$//;
			}
			elsif ($file =~ /\.$lib_extension$/) {
				$file =~ s/\.$lib_extension$//;
			} 
			else {
				next; 			# file is no lib
			}

			local ($file2) = $file;
			local ($k)     = index($file, '_');

			if ($k != -1) {
				# startindex to be justified for libraries not starting with 'lib'
				$file2 = substr($file, 3, $k - 3);
			}
			if ($file2 ne $l) { next; }

			if ($file =~ /$l/) {
				# print "lib $l file $file file2 $file2\n";

				if ($pathes{$file} eq '') {
					$pathes{$file} = $L;
					push(@possible_libs, $file);
					print "found $file in $pathes{$file}\n" if $debug > 1;
				}
				else {
					print "\nWARNING: $file found in \n$pathes{$file} and \n$L \nusing \n$pathes{$file}\n\n" if $debug > 1;
				}
			}
			else {
				print ":$file: don't match :$l:\n" if $debug > 8;
			}
		}
	}

	$sharedflag = 'null';
	$debugflag = 'null';
	$profileflag = 'null';
	$gcflag = 'null';
	
	$preferedlib = '';

	for (@possible_libs) {
		$mypossiblelib = $_;
		$myflags = $mypossiblelib;
		$myflags =~ /_([dpsg]{0,5})$/;	
		$myflags = $1;
	
		$mysharedflag = 1;
		$mysharedflag = 0 if $myflags =~ /s/;

		$mydebugflag = 0;
		$mydebugflag = 1 if $myflags =~ /d/;
	
		$myprofileflag = 0;
		$myprofileflag = 1 if $myflags =~ /p/;

		$mygcflag = 0;
		$mygcflag = 1 if $myflags =~ /g/;
		
	
		print "flags found $myflags in $mypossiblelib: shared=$mysharedflag, debug=$mydebugflag, profile=$myprofileflag, gc=$mygcflag\n" if $debug > 5;

		if($option{'gc'} == mygcflag) {
	
		if ($preferedlib eq '') {
			$preferedlib = $mypossiblelib;
			$sharedflag = $mysharedflag;
			$debugflag = $mydebugflag;
			$profileflag = $myprofileflag;
			$gcflag = $mygcflag;
			print "set prefered lib to $preferedlib because it was first found\n" if $debug > 0;
		}

		if($option{'shared'} && $mysharedflag && !$sharedflag) {
			$preferedlib = $mypossiblelib; $sharedflag = $mysharedflag; 
			$debugflag = $mydebugflag; $profileflag = $myprofileflag;
			print "set prefered lib to $preferedlib because its first dynamic lib found\n" 
																																					if $debug > 0;
		}
		if(!$option{'shared'} && !$mysharedflag && $sharedflag) {
			$preferedlib = $mypossiblelib; $sharedflag = $mysharedflag; 
			$debugflag = $mydebugflag; $profileflag = $myprofileflag;
			print "set prefered lib to $preferedlib because its first static lib found\n" 
																																					if $debug > 0;
		}

		if($option{'debug'} && $mydebugflag && !$debugflag) {
			if(($option{'shared'} ne 'null') && ($mysharedflag == $option{'shared'})) {
				$preferedlib = $mypossiblelib; $sharedflag = $mysharedflag; 
				$debugflag = $mydebugflag; $profileflag = $myprofileflag;
				print "set prefered lib to $preferedlib (add debugging)\n" if $debug > 0;
			}
		}
		if(!$option{'debug'} && !$mydebugflag && $debugflag) {
			if(($option{'shared'} ne 'null') && ($mysharedflag == $option{'shared'})) {
				$preferedlib = $mypossiblelib; $sharedflag = $mysharedflag; 
				$debugflag = $mydebugflag; $profileflag = $myprofileflag;
				print "set prefered lib to $preferedlib (disable debugging)\n" if $debug > 0;
			}
		}

		if($option{'profile'} && $myprofileflag && !$profileflag) {
			if(($option{'shared'} ne 'null') && ($mysharedflag == $option{'shared'})) {
				$preferedlib = $mypossiblelib; $sharedflag = $mysharedflag; 
				$debugflag = $mydebugflag; $profileflag = $myprofileflag;
				print "set prefered lib to $preferedlib (add profiling)\n" if $debug > 0;
			}
		}
		if(!$option{'profile'} && !$myprofileflag && $profileflag) {
			if(($option{'shared'} ne 'null') && ($mysharedflag == $option{'shared'})) {
				$preferedlib = $mypossiblelib; $sharedflag = $mysharedflag; 
				$debugflag = $mydebugflag; $profileflag = $myprofileflag;
				print "set prefered lib to $preferedlib (disable profiling)\n" if $debug > 0;
			}
		}
		}
		else {
			print "$mypossiblelib gc flag not matched.\n" if $debug > 0;
		}
	}

	
	$preferedlib =~ s/^lib//;
	if ($preferedlib eq '') {
		print "-l$l\n";
	}
	else {
		print "-l$preferedlib\n";
	}
}