--- a/tpc.js	Fri Jul 13 14:16:51 2012 -0700
+++ b/tpc.js	Fri Jul 13 17:03:59 2012 -0700
@@ -1,24 +1,65 @@
 var module = {exports: {}};
 var PEG;
 
-if (arguments.length < 1) {
-	print('usage: d8 tpc.js -- filename');
-	os.exit();
-} else {
-	compileFile(arguments[0]);
+var file = null;
+var argtype = 'normal';
+var includes = [];
+var basedir = '';
+for (var i = 0; i < arguments.length; i++) {
+	switch (argtype) {
+	case 'normal':
+		switch (arguments[i]) {
+		case '-basedir':
+		case '-i':
+			argtype = arguments[i];
+			break;
+		default:
+			if (arguments[i].charAt(0) == '-') {
+				print("unrecognized switch", arguments[i]);
+				quit(1);
+			}
+			file = arguments[i];
+		}
+		break;
+	case '-basedir':
+		if (basedir == '') {
+			basedir = arguments[i];
+			argtype = 'normal';
+		} else {
+			print("only one -basedir option allowed");
+			quit(1);
+		}
+		break;
+	case '-i':
+		includes.push(arguments[i]);
+		argtype = 'normal';
+		break;
+	}
+}
+if (argtype != 'normal') {
+	print("switch", argtype, "expects a parameter");
+	quit(1);
 }
 
-function compileFile(filename)
+if (!file) {
+	print('usage: d8 tpc.js -- filename');
+	quit(1);
+}
+	
+compileFile(file, basedir, includes);
+
+
+function compileFile(filename, basedir, includes)
 {
 	var text = read(filename);
-	load('peg.js');
+	load(basedir + 'peg.js');
 	PEG = module.exports;
-	load('parser.js');
-	load('compiler.js');
-	load('cbackend.js');
+	load(basedir + 'parser.js');
+	load(basedir + 'compiler.js');
+	load(basedir + 'cbackend.js');
 	try {
 		var parsed = parser.parse(text);	
-	} catch (e) {
+	} catch (error) {
 		print('SyntaxError on at', error.line, ',', error.column, ':', error.message);
 		var lines = text.split('\n');
 		print(lines[error.line-1]);
@@ -31,7 +72,7 @@
 			}
 		}
 		print(spacer + '^');
-		exit(1);
+		quit(1);
 	}
 	var c = parsed.toCModule();
 	print(c);